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Introduction to Satellite Remote Sensing. Miles Logsdon, Univ. of Washington Oceanography. SeaWiFS, June 27, 2001. My agenda. Show you pretty pictures Introduce Remote Sensing terms and concepts Get the language down “Think” about the future. Acknowlegements!!. - PowerPoint PPT Presentation
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Introduction to Satellite Remote SensingSeaWiFS, June 27, 2001Miles Logsdon, Univ. of WashingtonOceanography
My agendaShow you pretty picturesIntroduce Remote Sensing terms and conceptsGet the language downThink about the future
Acknowlegements!!Mark Abbott: Oregon State UniversityMODIS highlights, data, and imagesSeely Martin: University of WashingtonIllustrations, and explanationsRobin Weeks: University of WashingtonGraphics and dataLeon Delwiche: University of WashingtonIllustrationsMost of what you see here is explained better by these people
Lets start with some nice pictures
What is Remote Sensing and Image Classification?Remote Sensing is a technology for sampling radiation and force fields to acquire and interpret geospatial data to develop information about features, objects, and classes on Earth's land surface, oceans, and atmosphere (and, where applicable, on the exterior's of other bodies in the solar system).
Remote Sensing is detecting and measuring of electromagnetic energy (usually photons) emanating from distant objects made of various materials, so that we can identify and categorize these object by class or type, substance, and spatial distribution
Image Classification has the overall objective to automatically categorize all pixels in an image into classes or themes. The Spectral pattern, or signature of surface materials belonging to a class or theme determines an assignment to a class.
Specifically, we measure radiation produced in three ways:
1. Emitted from the surface (thermal IR)
2. Reflected from the surface (solar)
3. Reflected from energy pulses directed at the surface (RADAR)
Landsat-ETM30m resolution16-day repeat
MODIS Terra - Daytime Descending OrbitsMODIS1k resolutionDaily repeatBest response in a Ph.d. oral exam:Ill give up space to get time. Miles Logsdon
One goal is to produce a: Classified Product
MOD13 NDVI (16-day) 500m resolutionJune 2002(bright photosynthesizing vegetation)LowHighA second goal might be to produce a: Derived Product
MOD11 Daytime (8-day averaged) Land Surface TemperatureJune 2002~3o C~50o CTemperature (oC)
AprMayJunJulAugSepRemote Sensing as a Time SeriesSeaWifs, 1999, 1km monthly mean chlorophyll-a estimatesCurrent CollectionsPacific Northeast, Apr Sep, 1999 - 2003
AdditiveSubtractive
First: A few Simple Reminders about Spectral SignaturesThanks to Robin Weeks
Coordinate system used with satellite sensorsqZ Zenith angleq Look or incidence angle qS Solar zenith angle
When radiation interacts with the atmosphere, then depending on the wavelength, the three things that happen are - Absorption, - Scattering, - Emission.
The Effect of the Atmosphere on Spectral DataPath Radiance (Lp)Atmospheric Transmissivity (T)Thanks to Robin Weeks
ScatteringThere are two kinds of scattering,
Rayleigh or molecular scatter, which only matters in the visible; andMei or aerosol scatter (scatter from raindrops, sulfuric acid droplets, salt particles) which matter at much longer wavelengths.
Rayleigh Scatter
Solar scattering generates a Rayleigh path radiance
Two kinds of solar reflection in the visible: Direct surface reflection, diffuse sub-surface backscatter
Once the Light hits the surface we are concerned with reflection
The PIXEL
Wavelength (Bands)
Terrestrial and Ocean Color SensorsOcean ColorSensors
Comparison of Ocean Color InstrumentsInstrumentSatelliteDates of OperationSpatial ResolutionSwath WidthCZCSNimbus-710/24/78- 6/22/86825 m1556 kmMOSIRS P33/18/96-520 m200 kmMOSPriroda4/23/96-650 m85 kmOCTSADEOS8/17/96-700 m1400 kmSeaWiFSSeaStar5/971100 m2800 kmOCIROCSAT-14/98 (Delayed) 800 m690 kmMODISEOS AM-16/981000 m2330 kmGLIADEOS-22/99 (Delayed) 1000 m1600 kmMERISENVISAT-17/99 (Delayed) 1200 m1450 kmLow Resolution CameraKOMPSAT1999 (Delayed) 1000 m800
Band Combinations
We approach RS in two waysTo classify or group thematic land surface materialsTo detect a biophysical process
Cluster and Classify
Spectral Profile
Spatial Profile
Spectral Signatures
1d classifier
Spectral Dimensions
3 band space
Clusters
Dimensionality
N = the number of bands = dimensions . an (n) dimensional data (feature) spaceMeasurementVectorMeanVectorBand ABand B190 85Feature Space - 2dimensions
Spectral Distance
* a number that allows two measurement vectors to be compared
Classification ApproachesUnsupervised: self organizing
Supervised: training
Hybrid: self organization by categories
Spectral Mixture Analysis: sub-pixel variations.
Clustering / ClassificationClustering or Training Stage: Through actions of either the analysts supervision or an unsupervised algorithm, a numeric description of the spectral attribute of each class is determined (a multi-spectral cluster mean signature).Classification Stage: By comparing the spectral signature to of a pixel (the measure signature) to the each cluster signature a pixel is assigned to a category or class.
termsParametric = based upon statistical parameters (mean & standard deviation)Non-Parametric = based upon objects (polygons) in feature spaceDecision Rules = rules for sorting pixels into classes
Unsupervised ClusteringMinimum Spectral DistanceBand ABand BBand ABand B1st iteration cluster mean2nd iteration cluster mean
ISODATA clusters
Supervised Classification
Classification Decision RulesIf the non-parametric test results in one unique class, the pixel will be assigned to that class.if the non-parametric test results in zero classes (outside the decision boundaries) the the unclassified rule applies either left unclassified or classified by the parametric ruleif the pixel falls into more than one class the overlap rule applies left unclassified, use the parametric rule, or processing orderNon-Parametricparallelepipedfeature spaceUnclassified Optionsparametric ruleunclassifiedOverlap Optionsparametric ruleby orderunclassifiedParametric minimum distanceMahalanobis distancemaximum likelihood
Band ABand BParallelepipedBand ABand BMinimum DistanceMaximum likelihood(bayesian)probabilityBayesian, a prior (weights)
Parametric classifiers
Classification SystemsUSGS - U.S. Geological Survey Land Cover Classification Scheme for Remote Sensor Data USFW - U.S. Fish & Wildlife Wetland Classification System NOAA CCAP - C-CAP Landcover Classification System, and Definitions NOAA CCAP - C-CAP Wetland Classification Scheme Definitions PRISM - PRISM General Landcover King Co. - King County General Landcover (specific use, by Chris Pyle)
Level 1 Urban or Built-Up Land 11 Residential 12 Commercial and Services 13 Industrial 14 Transportation, Communications and Utilities 15 Industrial and Commercial Complexes 16 Mixed Urban or Built-Up 17 Other Urban or Built-up Land
2 Agricultural Land 21 Cropland and Pasture 22 Orchards, Groves, Vineyards, Nurseries and Ornamental Horticultural Areas 23 Confined Feeding Operations 24 Other Agricultural Land
Detecting a Process: Two examplesUsing band math
Laboratory Spectral Signatures IICommon Urban MaterialsHealthy grassConcreteAstroturfwavelengthThanks to Robin Weeks
Vegetation:
Pigment in Plant Leaves (Chlorophyll) strongly absorbs visible light (0.4 to 0.7 m)
Cell Structure however strongly reflects Near-IR (0.7 1.1 m)
Thanks to Robin Weeks
(courtesy http://earthobservatory.nasa.gov) NDVIBand 3Band 4Band 4 - Band 3Band 4 + Band 3Simple RatioNDVIWhen using LANDSAT:
Ocean ColorLets begin with phytoplanktonPhyton = plant; planktos = wandering.These reproduce asexually, are globally distributed, consist of 10s of thousands of species and make up about 25% of the total planetary veg.These are the grass that the zooplankton graze upon.And, they fix carbon as well.
Chaetoceros species of diatoms: cells are 20-25 mm in diameter.Chloroplasts contain pigments
Water provides an internal standard shape for spectral comparison with other variable componentsSlopes for pigments and CDOM similar from 440 to 600 nm, but are opposite from 400 to 440 nmNote that detritus is include with CDOM since shapes are similarSpectral de-convolution of pigment absorption from CDOM absorption is straight-forwardShapes of phytoplankton or pigment absorption are not constant (next slide) For Case 2 waters, ratio of CDOM to chlorophyll a is not constant Strategy for Spectral Separation of Absorption Components with Semi-Analytic AlgorithmKen Carder: University of South Florida
Absorption spectra for water, CDOM, and phytoplankton
Colored Dissolved Organic Material(CDOM)Organic SourcesTerrestrial CDOMdecay vegetation from river and nearshoreOcean CDOMdetritus - cell fragments, zooplankton fecalInorganic SourcesSand & Dust => Errosionrivers, wind, wave or current suspension
Whats the difference between MODIS chlorophylls?
Case 1 waters:Chlor_MODIS (Clark) This is an empirical algorithm based on a statistical regression between chlorophyll and radiance ratios.
Case 2 waters:Chlor_a_3 (Carder) This is a semi-analytic (model-based) inversion algorithm. This approach is required in optically complex case 2 (coastal) waters and low-light, nutrient-rich regions (hi-lats).
A 3rd algorithm was added to provide a more direct linkage to the SeaWiFS chlorophyll:SeaWiFS-analog Chlor_a_2 (Campbell)SeaWiFS algorithmOC4.v4 (OReilly) Ken Carder: University of South Florida
Chl-a increasingFlorescenceIndependent of Chl-aR(l)
Case 1 Rrs Model with superimposed MODIS bands 8-14: All variables co-vary with chlorophyll aNote that slopes between blue and green wave lengths decrease with increasing chlorophyll, explaining the strategy of empirical algorithmsCase 2 waters are more complicated
Ken Carder: University of South Florida
Chart2
0.013450.0132646219
0.009980.0099010603
0.007550.0075312804
0.005810.0058245351
0.004540.0045712489
0.003590.0036349566
0.002880.0029246257
0.002330.0023782062
0.001930.0019525762
0.001620.0016172383
0.001410.0013502788
0.0011357213
0.0009617628
0.0008195765
0.0007024867
0.0006053915
0.0005243544
Chart1
0.6870.34635
0.7810.4478775
0.8280.540895
0.8830.6254025
0.9130.7014
0.9390.7688875
0.9730.827865
1.0010.8783325
10.92029
0.9537375
0.978675
absorption
lama_w1a_w2P& F modchl-specific absorption coef.chl-specific absorption coef.0.010.020.050.10.20.5125
(nm)(1/m)(1/m)
380ND0.011370.011370.346350.346350.01298650980.0136067710.01499890420.01676455630.01953516150.02575359190.03364047030.0460163090.0737930176
3850.00950.009410.009410.44787750.44787750.01122146740.01202114830.01381597660.01609236960.01966441330.02768161650.03784989090.05380562360.0896171551
3900.00870.008510.008510.5408950.5408950.01054478760.01150784690.01366936650.01641083670.02071266450.03036781770.04261351520.06182907440.1049570594
3950.00810.008130.008130.62540250.62540250.0103865850.01149719470.01398988080.01715137180.02211228290.03324670270.04736856430.06952814040.1192637666
4000.0070.006630.006630.6870.70140.6870.0090003670.01021737830.01294887540.01641325210.02184944180.03405059130.04952539360.07380796110.1283084939
4050.0060.00530.00530.7810.76888750.7810.00789826090.00927862770.01237676490.01630615380.0224720260.03631089680.05386283230.08140477130.1432207365
4100.00560.004730.004730.8280.8278650.8280.00743966630.00889997480.01217753540.01633448830.02285744650.03749777220.05606619860.08520318260.1505991154
4150.00520.004440.004440.8830.87833250.8830.00729666390.00885086340.01233915610.01676338170.0237057360.03928736690.05904965720.09006001450.1596606032
4200.00540.004540.004540.9130.920290.9130.0074782970.00908230220.01268238030.01724838430.02441321250.04049417070.06088976120.09289387320.1647248749
4250.00610.004780.004780.9390.95373750.9390.0077912990.00943810710.01313425330.0178221010.02517812270.04168820120.06262804810.09548618970.1692340018
4300.00640.004950.004950.9730.9786750.9730.00805712060.00976077960.01358452370.01843420470.026044170.04312420730.06478693680.09877940290.1750731273
4350.00690.00530.00531.0011.0010.00848838420.01023840470.01416620390.01914785880.02696491320.04450974770.06676198270.10167948210.1800493793
4400.00830.006350.00635110.00954426590.01129005610.01520836060.02017797340.02797613170.04547855520.0676770.10251009360.1806905477
4450.00950.007510.007510.9710.9710.01062441260.01231732780.0161169580.02093605520.02849802940.04547035410.06699647080.10077456860.1765871582
4500.0110.009220.009220.9440.9440.01226839150.01391219590.01760160030.02228089750.02962350170.0461034660.06700511870.09980332720.1734166236
4550.0120.009620.009620.9280.9280.01261180740.01422588360.01784856530.02244323760.02965305120.04583497590.0663586230.09856367730.1708456801
4600.01220.009790.009790.9170.9170.01273719660.01433042020.01790629980.02244161260.02955828130.04553114870.06578964690.0975786380.1689268159
4650.01250.010110.010110.9020.9020.01300314150.01456872610.01808257160.02253920620.02953241540.04522818690.06513524230.09637276060.1664831963
4700.0130.01060.01060.870.870.01338987060.01489849450.01828449590.02257898490.02931776040.04444247310.06362525080.09372625550.1612858654
4750.01430.01140.01140.8390.8390.01409356820.01554716080.01880964820.02294748360.02944044330.04401343940.06249647110.09149945660.156594639
4800.01570.01270.01270.7980.7980.0152721860.01665361350.01975413140.02368653970.02985714970.04370665440.06127207690.08883517930.1506986443
4850.01680.01360.01360.7730.7730.01609413160.01743125950.02043234990.02423865360.03021138440.04361676290.06061889710.08729810540.1471777316
4900.01850.0150.0150.750.750.01742671750.01872313580.02163285640.02532327520.03111416290.04411140730.06059590240.08646284770.1445194061
4950.02130.01730.01730.7170.7170.01963627610.0208748280.02365467150.02718036620.03271277430.04512987910.0608785790.0855909380.1410561077
5000.02420.02040.02040.6680.6680.02260224040.02375543350.02634369510.02962640520.03477752950.04633886960.0610021970.08401142420.1356540331
5050.030.02560.02560.6450.6450.02776130170.02887414460.03137184310.03453969140.03951057820.05066738760.06481764620.08702178180.1368574189
5100.03820.03250.03250.6180.6180.03461630410.03568198720.03807383880.04110744070.04586767230.05655168090.07010228290.09136545660.13908917
5150.04620.03960.03960.5820.5820.04163954540.04264264430.04489403020.04774947850.05223015710.06228672830.07504154720.09505600330.1399770571
5200.04740.04090.04090.5280.5280.04276501910.04367461950.04571615420.04830544670.05236848230.06148768270.07305362770.09120254080.1319365131
5250.04850.04170.04170.5040.5040.04347853220.04434640650.046294290.04876480420.05264145630.06134233230.07237771360.08969408280.1285594683
5300.05050.04340.04340.4740.4740.04507967450.04589555590.04772674490.05004925470.05369366310.06187328420.07224755410.08852652860.1250635537
5350.05270.04520.04520.4440.4440.04678131260.04754526450.04925990140.05143458720.05484703490.06250603640.07222000090.08746284510.1216743481
5400.05510.04740.04740.4160.4160.04889090690.04960642710.05121236220.05324918080.05644529180.06361874050.07271687510.08699337860.1190359969
5450.05940.05110.05110.3840.3840.05249502930.05315529030.05463720010.05651671650.0594659940.06608544190.07448093350.08765487190.1172228598
5500.06540.05650.05650.3570.3570.05782039660.05843404310.05981132970.06155815190.06429920980.07045132330.07825409150.09049794720.117978429
5550.0690.05960.05960.3210.3210.06080741160.06135901850.06259706160.06416728040.06663121760.07216135340.07917526270.09018126630.1148834752
5600.07150.06190.06190.2940.2940.06301812070.06352319470.06465679820.06609455530.0683506380.07341425860.07983648370.08991403510.1125323977
5650.07430.06420.06420.2730.2730.06524692360.06571580320.06676817070.06810289560.07019730360.07489805660.08086005410.09021543090.1112129231
5700.08040.06950.06950.2760.2760.07055787140.07103179240.07209547530.07344455160.07556147930.08031277610.08633887870.09579484730.1170181106
5750.0890.07720.07720.2680.2680.07824159890.07870168270.07973430860.08104399520.08309911380.08771168440.09356183960.1027417170.123345313
5800.10160.08960.08960.2910.2910.09072995640.09122942320.09235044170.09377223720.09600327340.1010106790.10736160610.11732727890.1396945379
5850.12350.110.110.2740.2740.11111505420.11158525320.11264058220.11397906320.1160793650.12079334630.12677212130.13615382490.1572104056
5900.14870.13510.13510.2820.2820.1362809630.13676480470.13785075380.13922807050.14138931220.14624006860.15239231650.16204622830.1837137614
5950.18180.16720.16720.2490.2490.16833229350.16875944490.16971815650.1709340970.17284211220.17712451950.18255592620.1910787170.2102075276
6000.24170.22240.22240.2360.2360.22358471960.22398950750.22489802590.22605030610.22785842750.23191663010.23706367650.2451402580.2632675831
6050.27950.25770.25770.2790.2790.25905224550.25953071850.26060461770.26196665150.26410391170.26890084350.27498482520.28453161570.3059587227
6100.28760.26440.26440.2520.2520.26564860520.26608071650.26705056010.26828061940.27021078940.27454292150.28003739470.28865914730.308010071
6150.29160.26780.26780.2680.2680.26906948840.26952897790.270560270.27186826490.2739207290.27852734170.28436994050.29353796060.3141149438
6200.30470.27550.27550.2760.2760.27677463410.27724778450.27830973780.27965662040.28177010590.28651367680.29252998070.30197057330.3231593264
6250.31350.28340.28340.2990.2990.28472569250.28523821650.28638854090.28784750530.29013686580.29527517620.30179213080.31201832860.3349703179
6300.31840.29160.29160.3170.3170.29296252970.2935058530.29472530410.29627194250.29869887820.30414596650.31105454630.321895270.3462265198
6350.33090.30120.30120.3330.3330.30259555930.30316625190.30444713160.30607168030.30862087040.31434235020.32159894260.33298575660.3585426681
6400.33820.31080.31080.3340.3340.31218359610.31275595210.31404056520.31566984890.3182264690.32396462510.3312423680.34266237080.3682937723
6450.35130.3250.3250.3260.3260.32634997690.32690857790.32816231880.32975244720.3322476260.33784788120.34495072360.35609627810.3811116992
6500.35940.340.340.3560.3560.34143115480.3420411140.34341012510.34514645130.34787103910.35398618690.36174207120.37391235810.40122772
6550.38520.3710.3710.3890.3890.37253666850.37320312130.37469892820.37659607050.37957300590.38625453020.39472875360.40802623550.4378715081
6600.42120.410.410.4410.4410.41170422630.41245971760.41415536530.4163059670.41968062270.42725480270.43686118750.45193522110.4857678403
6650.43110.4290.4290.5340.5340.43097485140.43188960720.4339427130.43654668120.44063274540.4498036320.46143513090.4796869090.5206517548
6700.43460.4390.4390.5950.5950.44114147360.4421606650.44444816920.44734942650.45190198720.46211989290.47507933330.49541487510.5410565832
6750.4390.4480.4480.5440.5440.44997088850.45090267030.45299398980.45564642470.45980854120.46915012210.48099811380.49958960550.5413169146
6800.45240.4650.4650.5020.5020.46683366260.46769346210.46962322220.47207075040.47591133370.48453125570.49546396240.51261921810.5511229953
6850.4690.4860.4860.420.420.4875786110.48829793140.4899123960.49196003260.49517311890.50238466730.51153112410.52588345320.5580962568
6900.49290.5160.5160.3290.3290.51730157810.51786502110.51912962970.52073354150.52325034890.5288991480.53606355890.54730572470.5725379833
6950.53050.5590.5590.2620.2620.56010309240.56055177340.56155880660.56283603380.56484021810.56933847030.57504363460.58399599710.6040889515
7000.58390.6240.04010.6240.2150.2150.62497450020.62534267860.62616902940.62721709580.62886168830.63255286170.63723440240.64458052710.6610683929
7050.65330.7040.05070.704
7100.75610.8270.07090.827
7150.90291.0070.10411.007
7201.07451.2310.15651.231
7251.27881.4890.21021.489
7301.60690.251.8569
7351.96240.252.2124
7402.14560.252.3956
7452.14230.252.3923
7502.1950.252.445
scattering
wavelengthbbswBb sw modwavelengthest. bbsw0.010.020.050.10.20.5125
3500.013450.0132646220.01353800.00936047240.00515475830.00538798990.00584253790.00634080260.00702014670.00828516890.00959054720.01124361760.013947266
3750.009980.00990106040.01003850.00885589740.00489670650.00512714980.00557632170.00606876840.00674029340.00799108420.00928223150.01091801690.0135957133
4000.007550.00753128050.00763900.00838451440.00465539840.0048831250.00532705860.00581383650.00647774290.00771466710.00899194850.0106108920.0132633019
4250.005810.00582453510.00583950.00794375540.00442954460.00465462320.00509345120.00557470380.00623118440.00745459310.00871835950.01032088770.0129486511
4500.004540.00457124890.00454000.00753128050.00421796960.00444046640.00487431640.00535018180.00599942230.00720965350.00846024270.01004676590.012650499
4750.003590.00363495660.00364050.00714495420.00401960070.00423957950.00466857450.00513918570.00578136490.00697874380.00821648130.00978739460.0123676908
5000.002880.00292462570.00294100.00678282620.0038334580.00405098020.00447523840.00494072370.00557601370.00676085390.00798605310.00954173720.0120991683
5250.002330.00237820620.00234150.00644311290.0036586450.00387376970.00429340550.00475388820.00538245520.00655505870.00776802170.00930884370.0118439604
5500.001930.00195257620.00194200.00612418130.00349434080.00370712530.00412224850.00457784790.00519985180.00636051010.00756152830.0090878420.0116011757
5750.001620.00161723840.00164250.00582453510.00333979320.00355029240.00396100930.00441184020.00502743560.00617642960.0073657840.00887793080.011369994
6000.001410.00135027880.00144300.00554280140.00319431170.00340257870.00380899190.00425516520.0048645010.0060021020.0071800640.00867837330.0111496607
6250.00113572130.00114350.00527771940.00305726210.00326334840.00366555660.00410717940.00471039950.00583686960.00700370090.00848849080.01093948
6500.00096176280.00104400.00502813020.00292806150.00313201640.00353011540.00396729110.00456453450.00568012650.00683608010.0083076580.0107388103
6750.00081957650.00084450.00479296740.0028061730.00300804460.00340212660.00383495510.00442635620.00553131450.0066766350.00813529760.0105470588
7000.00070248670.00074500.00457124890.00269110240.00289093690.00328109120.00370966920.00429535770.00538991870.00652484220.00797087670.0103636777
7250.00060539150.00064550.00436206920.00258239370.0027802360.00316654890.00359096980.00417107130.00525546350.00638021860.00781390240.0101881599
7500.00052435440.00054600.0041645930.00247962630.00267551960.00305807460.00347842870.00405306470.00512750920.00624231690.00766391860.0100200357
4650.00397804870.00238241150.00257639780.00295527570.00337165050.00394093850.00500564920.00611072350.00752050280.0098588697
4700.00380172310.002290390.00248250980.00285778890.00327026910.00383432280.00488950680.00598505470.00738326330.0097042576
4750.00363495660.00220322930.00239352190.00276527790.00317394540.00373287520.0047787330.00586495520.00725183650.009555824
4800.00347713840.00212062140.00230912480.00267743120.00308236550.0036362780.0046730040.00575009460.00712588480.0094132197
4850.00332770250.00204228090.00222903210.002593960.0029952380.00354423670.00457201910.00564016650.00700509410.0092761199
4900.00318612410.00196794310.00215297780.00251459610.00291229250.00345647770.0044754990.00553488570.00688917250.0091442219
4950.00305191590.00189736210.0020807150.00243909050.00283327770.00337274660.00438318390.00543398690.00677784770.0090172435
5000.00292462570.00183030960.00201201430.0023672120.00275796010.0032928070.0042948320.00533722280.00667086640.0088949216
5050.00280383290.00176657330.00194666250.00229874520.00268612230.00321643880.00421021790.00524436340.00656799180.0087770104
5100.00268914630.00170595560.00188446090.00223348980.0026175620.00314343690.00412913190.00515519350.00646900340.00866328
5150.00258020190.00164827260.00182522480.00217125910.00255209060.00307361010.0040513780.00506951280.00637369460.0085535156
5200.00247666060.00159335280.00176878180.00211187920.00248953230.00300678020.00397677340.00498713380.00628187270.008447516
5250.00237820620.00154103650.00171497130.00205518760.00242972290.00294278050.00390514710.00490788120.00619335720.0083450929
5300.00228454390.00149117460.00166364330.00200103290.00237250920.00288145560.00383633960.00483159120.0061079790.0082460694
5350.00219539850.00144362770.00161465790.00194927360.0023177480.00282266010.00377020120.00475811030.00602557970.00815028
5400.0021105130.00139826580.0015678840.00189977730.00226530550.00276625790.00370659220.00468729460.00594601090.008057569
5450.00202964710.00135496730.00152319950.00185242020.00221505620.00271212170.00364538130.00461900940.00586913310.0079677901
5500.00195257620.00131361840.00148048970.00180708650.00216688290.00266013210.00358644570.00455312810.00579481540.007880806
5550.00187909010.00127411260.00143964750.00176366770.00212067560.00261017730.00352967010.00448953190.00572293480.0077964871
5600.00180899190.00123635020.00140057260.00172206210.00207633140.00256215240.00347494610.00442810920.00565337570.0077147119
5650.00174209740.00120023750.00136317070.00168217430.00203375340.0025159590.00342217220.0043687550.00558602920.0076353654
5700.00167823350.0011656870.00132735350.00164391490.0019928510.00247150460.00337125280.00431137080.00552079280.0075583396
5750.00161723840.00113261630.00129303820.00160719990.0019535390.00242870220.00332209790.00425586350.00545756990.0074835323
5800.00155895970.00110094830.0012601470.00157195030.00191573710.00238747030.00327462290.00420214570.00539626940.0074108472
5850.00150325460.00107061020.00122860680.0015380920.00187937020.00234773190.00322874810.00415013480.00533680560.0073401934
5900.0014499890.00104153410.00119834870.00150555510.00184436730.00230941460.00318439850.00409975310.00527909720.0072714846
5950.00139903660.00101365560.00116930820.00147427410.00181066160.00227245040.00314150330.00405092720.00522306780.0072046397
6000.00135027880.00098691440.00114142440.00144418720.00177819050.00223677490.00309999580.00400358770.00516864490.0071395815
6050.0013036040.00096125380.00111464010.00141523610.00174689450.00220232770.00305981280.00395766930.005115760.0070762372
6100.0012589070.00093662020.00108890110.0013873660.0017167180.00216905140.00302089490.00391310990.00506434850.0070145377
6150.00121608890.00091296320.00106415670.0013605250.00168760820.00213689230.00298318580.00386985110.00501434890.0069544175
6200.00117505630.00089023520.00104035890.00133466450.00165951530.00210579940.00294663240.00382783750.00496570330.0068958144
6250.00113572130.00086839130.00101746240.00130973820.00163239240.00207572440.00291118440.00378701660.00491835650.0068386694
6300.00109800080.00084738930.00099542440.00128570270.00160619520.0020466220.00287679420.00374733880.00487225630.0067829267
6350.00106181670.00082718920.00097420460.00126251680.00158088170.0020184490.00284341670.0037087570.00482735330.0067285329
6400.00102709490.00080775320.00095376480.00124014170.00155641220.00199116470.00281100920.00367122650.00478360040.0066754375
6450.00099376560.00078904560.00093406910.00121854060.00153274910.00196473040.00277953120.0036347050.00474095290.0066235923
6500.00096176280.00077103270.00091508320.00119767870.0015098570.00193910980.00274894440.00359915220.00469936840.0065729517
6550.00093102410.00075368250.00089677490.0011775230.00148770210.0019142680.00271921230.00356452990.00465880650.006523472
6600.00090149050.00073696490.00087911370.00115804240.00146625260.00189017230.00269030030.00353080190.00461922880.0064751116
6650.00087310610.00072085130.00086207070.00113920740.00144547810.00186679150.00266217570.00349793370.00458059890.006427831
6700.00084581820.00070531450.00084561840.00112098980.00142535020.00184409610.00263480730.00346589240.0045428820.0063815925
6750.00081957650.0006903290.00082973080.00110336310.00140584140.00182205790.00260816530.00343464680.00450604480.00633636
6800.00079433370.00067587030.00081438340.00108630210.0013869260.00180065030.00258222160.00340416720.00447005580.0062920992
6850.00077004490.00066191540.00079955280.00106978290.00136857950.00177984790.00255694940.00337442520.00443488490.0062487772
6900.00074666740.00064844240.00078521670.00105378280.00135077850.00175962670.0025323230.0033453940.00440050350.0062063628
6950.00072416080.00063543050.00077135420.00103828020.00133350090.00173996360.00250831830.00331704770.00436688390.0061648259
7000.00070248670.000622860.00075794520.00102325450.00131672570.0017208370.0024849120.00328936190.00433400020.0061241378
Rrs plot
0.01457666030.01455158520.01438106790.01407825670.01356163980.01248662280.01138060360.01007332030.0081546893
0.01558495670.01533812760.01475149050.01404836780.01309528090.01149177410.01010305610.00865362740.0067574916
0.01571177730.01528306640.0143857650.01341976150.01222152370.01039224260.00893872320.00751434310.0057554162
0.01533704440.01478360960.01369226540.01258388420.01127807530.00939578510.00797426230.00663078250.0050242316
0.01636982370.01554088830.01402961010.01261126020.01105145130.0089639610.00748479240.00614633310.0046039673
0.01730222450.01608870370.01405063660.01229359070.01049728930.00827009770.00678978980.00550588240.004077826
0.01744471090.01604632890.01378627570.01191335370.01006031280.00783647920.00639609870.00516641020.0038149593
0.01713219490.01561729790.01324219960.01133389440.00949251020.00733544320.00596398320.0048057680.0035427347
0.01633697270.0148697450.0125841130.01075969480.00900792960.00696396090.00566689690.00457146940.0033752262
0.01539214560.01402251290.0118863210.0101793650.00853841010.0066197280.00539854310.00436393130.0032296112
0.01456420710.01326046780.01123414540.00962080370.00807375060.00626767690.00511814130.00414302770.0030714694
0.01358412890.01239911370.01054540050.00906032940.00762876430.00594739870.0048706910.00395268760.0029383668
0.01204342610.01114073190.00966433550.00842906620.00719593810.0056958170.00470643420.00384579950.002877829
0.01071857020.01006909880.0089414590.00794207410.00689677480.00556366960.00464906930.00383198310.0028913158
0.00922849080.00882603650.00806026260.00732211930.00649644040.00536967680.00455221790.00379409880.0028928926
0.00871890510.00838675190.00772986320.007075950.00632613470.00527702010.00449973090.00376821120.0028870437
0.00835948680.00807095390.00748313420.00688437920.00618607240.00519242380.00444567720.00373574180.0028725168
0.00794366710.0077088510.00720632880.00667541310.00603973380.00511188920.004399970.00371344380.0028680622
0.00749330710.00732712270.00693418770.00649012170.00593328510.00508456580.0044107450.00374605090.0029114454
0.00693545240.00684409140.00657516770.00623332670.0057726060.00502435110.00440119840.00376723380.0029504207
0.00625476240.00624688810.00612316780.00590705340.00556948260.00495508060.0044012280.00380943970.0030160049
0.00577672190.0058162590.00577904780.00564207690.00538634270.00486720290.0043668070.00381070130.0030415675
0.00520532340.00529062840.00534212780.00529122020.00512912980.0047254110.00429360730.00378582650.0030527626
0.00452012220.00464988690.00479522060.00484270250.00479477350.00454137390.00420378130.00376429750.00308239
0.00384302430.00400568720.00422968090.00436887840.00443707660.00435134850.00412725240.00377378470.0031567816
0.00306914090.00324014180.00350233350.00370168070.00386180270.00393574350.00383996750.00360015810.0030917183
0.00240941840.00257338270.00284261030.00307103310.003290240.00349079810.00351408840.0033920550.0030079113
0.00195335280.0021056560.00236661870.00260274680.00285109330.0031329760.00324631840.00322361730.0029542426
0.00184269610.00199673670.00226518620.00251428410.00278550050.00311632430.00327828630.003305760.0030869435
0.0017560180.00191001730.00218060520.00243472870.00271596140.00307037220.00325771320.00331346030.0031270197
0.00164259950.00179449830.00206429880.00232174030.00261278590.00299505930.0032156640.00331104720.0031732395
0.00153568050.00168494870.00195273090.00221200570.00251089350.00291826040.00317091510.00330642260.0032205705
0.00142637140.00157173490.00183495860.00209333050.00239664440.00282431840.00310652790.00328203530.0032523542
0.00129080460.00142908360.0016822410.00193476850.00223763360.00268185650.00299564290.00321935020.0032650013
0.00113959160.00126762440.00150447780.00174438650.00203802450.00248501090.00282071380.00308718970.0032122025
0.00105284110.00117604280.00140576640.00164118290.00193384460.00239225290.00275280640.00306124810.0032601884
0.00098708720.00110667290.00133087230.00156248220.0018535220.00231846250.00269581790.00303469740.0032912618
0.00092663380.00104251230.00126070280.00148754680.00177503650.00224153380.00262959360.00299122060.00329575
0.00083375310.00094104530.00114366060.00135520650.00162480250.00206664610.00243985340.00279538940.0031124889
0.00073201630.00082921550.00101361970.00120746420.00145674740.00187209210.00223196610.0025875710.002934408
0.00061502870.00069894950.00085859240.00102706030.00124480440.00161085170.00193225910.00225570910.0025843817
0.00048956620.0005586860.00069105830.00083215080.00101698550.00133552640.00162617050.00193495590.0022883655
0.00038908920.00044559210.00055422660.00067069120.00082445390.0010932590.00134394880.00161850990.0019531727
0.00030706690.00035300390.00044178510.00053771210.00066571680.00089400720.00111363840.00136495640.0016999877
0.00022544570.00026009340.00032732210.0004003940.00049869160.00067667460.00085197820.0010592970.0013544779
0.00018965290.00021938250.00027708440.00033982210.00042424620.00057717320.00072785050.0009060620.0011596499
0.00018023740.0002090830.00026513350.00032617960.0004085190.00055832890.00070696310.0008845090.0011422783
0.00017347430.00020174660.00025667380.00031647760.00039710030.00054362950.00068874380.00086161150.0011111668
0.00016447550.00019178110.00024484050.00030262440.00038054480.0005222210.00066260460.00082994610.0010718066
0.00015598530.00018233990.00023354180.00028928340.00036440820.00050084040.00063575660.00079609490.0010263737
0.00014795640.00017339580.00022281790.00027661590.00034910480.00048067950.0006106650.00076490690.0009857077
0.00013985370.00016432110.00021185830.00026360660.00033333330.00045987960.00058485930.00073307760.0009449793
0.00013239260.00015596630.00020178610.0002516940.00031899160.0004412960.00056233580.00070629310.0009132748
0.00012373340.00014616080.00018978370.00023734850.00030157670.00041860970.00053490580.00067401830.000876346
0.00011558660.00013687980.00017829230.00022343650.00028437230.00039530970.0005053810.0006367410.000826856
0.0001035760.0001229740.00016070950.00020185770.00025741870.00035862470.00045910990.00057912630.0007530556
0.00009166470.00010910790.00014304280.00018004730.00023001080.00032100010.0004112930.00051903220.0006748156
0.00008566140.00010219310.00013432260.00016930220.00021642150.00030183410.00038595660.00048523740.0006256128
0.00008188960.00009792240.00012906360.00016293350.00020849130.00029083220.00037154330.00046613910.000598014
0.0000785820.00009422660.00012464840.0001577930.00020248130.00028361740.0003637190.0004585640.0005935421
0.00007416350.00008917220.000118390.0001502760.00019336620.00027194480.000350060.00044347050.0005790742
0.00006954820.00008386270.00011177570.00014231510.00018373210.00025977560.00033619370.00042900570.0005680253
0.00006422450.00007766620.00010392310.00013272750.00017193740.00024444950.00031816070.00040917760.0005501331
0.00005813330.0000704950.00009467480.00012125540.00015754190.00022501960.00029421870.00038075340.0005182361
0.00005107550.00006210280.00008369520.00010746920.00013999590.00020073760.00026344730.00034262480.000470881
Input [chl a] (mg m-3)
chl_a: 0.01
chl_a: 0.02
chl_a: 0.05
chl_a: 0.1
chl_a: 0.2
chl_a: 0.5
chl_a: 1
chl_a: 2
chl_a: 5
wavelength (nm)
Remote sensing reflectance (sr-1)
Rrs est
wavelengthchl_a: 0.01chl_a: 0.02chl_a: 0.05chl_a: 0.1chl_a: 0.2chl_a: 0.5chl_a: 1chl_a: 2chl_a: 5
3800.01457666030.01455158520.01438106790.01407825670.01356163980.01248662280.01138060360.01007332030.0081546893
3850.01558495670.01533812760.01475149050.01404836780.01309528090.01149177410.01010305610.00865362740.0067574916
3900.01571177730.01528306640.0143857650.01341976150.01222152370.01039224260.00893872320.00751434310.0057554162
3950.01533704440.01478360960.01369226540.01258388420.01127807530.00939578510.00797426230.00663078250.0050242316
4000.01636982370.01554088830.01402961010.01261126020.01105145130.0089639610.00748479240.00614633310.0046039673
4050.01730222450.01608870370.01405063660.01229359070.01049728930.00827009770.00678978980.00550588240.004077826
4100.01744471090.01604632890.01378627570.01191335370.01006031280.00783647920.00639609870.00516641020.0038149593
4150.01713219490.01561729790.01324219960.01133389440.00949251020.00733544320.00596398320.0048057680.0035427347
4200.01633697270.0148697450.0125841130.01075969480.00900792960.00696396090.00566689690.00457146940.0033752262
4250.01539214560.01402251290.0118863210.0101793650.00853841010.0066197280.00539854310.00436393130.0032296112
4300.01456420710.01326046780.01123414540.00962080370.00807375060.00626767690.00511814130.00414302770.0030714694
4350.01358412890.01239911370.01054540050.00906032940.00762876430.00594739870.0048706910.00395268760.0029383668
4400.01204342610.01114073190.00966433550.00842906620.00719593810.0056958170.00470643420.00384579950.002877829
4450.01071857020.01006909880.0089414590.00794207410.00689677480.00556366960.00464906930.00383198310.0028913158
4500.00922849080.00882603650.00806026260.00732211930.00649644040.00536967680.00455221790.00379409880.0028928926
4550.00871890510.00838675190.00772986320.007075950.00632613470.00527702010.00449973090.00376821120.0028870437
4600.00835948680.00807095390.00748313420.00688437920.00618607240.00519242380.00444567720.00373574180.0028725168
4650.00794366710.0077088510.00720632880.00667541310.00603973380.00511188920.004399970.00371344380.0028680622
4700.00749330710.00732712270.00693418770.00649012170.00593328510.00508456580.0044107450.00374605090.0029114454
4750.00693545240.00684409140.00657516770.00623332670.0057726060.00502435110.00440119840.00376723380.0029504207
4800.00625476240.00624688810.00612316780.00590705340.00556948260.00495508060.0044012280.00380943970.0030160049
4850.00577672190.0058162590.00577904780.00564207690.00538634270.00486720290.0043668070.00381070130.0030415675
4900.00520532340.00529062840.00534212780.00529122020.00512912980.0047254110.00429360730.00378582650.0030527626
4950.00452012220.00464988690.00479522060.00484270250.00479477350.00454137390.00420378130.00376429750.00308239
5000.00384302430.00400568720.00422968090.00436887840.00443707660.00435134850.00412725240.00377378470.0031567816
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5100.00240941840.00257338270.00284261030.00307103310.003290240.00349079810.00351408840.0033920550.0030079113
5150.00195335280.0021056560.00236661870.00260274680.00285109330.0031329760.00324631840.00322361730.0029542426
5200.00184269610.00199673670.00226518620.00251428410.00278550050.00311632430.00327828630.003305760.0030869435
5250.0017560180.00191001730.00218060520.00243472870.00271596140.00307037220.00325771320.00331346030.0031270197
5300.00164259950.00179449830.00206429880.00232174030.00261278590.00299505930.0032156640.00331104720.0031732395
5350.00153568050.00168494870.00195273090.00221200570.00251089350.00291826040.00317091510.00330642260.0032205705
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5650.00092663380.00104251230.00126070280.00148754680.00177503650.00224153380.00262959360.00299122060.00329575
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6950.00005813330.0000704950.00009467480.00012125540.00015754190.00022501960.00029421870.00038075340.0005182361
7000.00005107550.00006210280.00008369520.00010746920.00013999590.00020073760.00026344730.00034262480.000470881
SeaWiFS empirical OC4 algorithm for Chl-a; Called a maximum-band ratio alg.
MODIS Ocean ProductsMODIS Instruments: Terra (1030 morning), Aqua (1330 afternoon)40 products: 4 SST, 36 Ocean ColorResolution:Spatial: Level 2 - 1km, ~2000km x 2000km; Level 3 - 4km, 39 km, 1 deg [all products are global]Temporal Resolution:Level 2 - 5 minute granule; Level 3 - daily, 8 day week, monthly, yearly
MODIS Ocean data productsThere are 86 ocean parameters available in over 100 categories of MODIS Ocean data types archived by (and may be obtained from) the NASA Goddard Distributed Active Archive Center.
The three basic groupings of MODIS ocean data parameters are:ocean colorsea surface temperatureocean primary production Ocean Parameter categories:36 Ocean Color parameters4 Sea Surface Temperature parameters8 Primary Productivity parameters (including 2 Primary Production indices) 38 Quality Control parameters.
Processing levelsOcean color and sea surface temperature are available at a variety of processing levels:
Level 1 - Unprocessed top of the atmosphere radiance/reflectanceAt 1-km spatial resolution5 minute granule time resolution Level 2 swath data At 1-km spatial resolution5 minute granule time resolutionLevel 3 global binned or mapped data spatial resolutions of 4.63km, 39km, or 1 degreeTime resolutions of one day, 8 days, a month or a year. The binned data products use an integerized sinusoidal equal area grid (ISEAG). The mapped products use a Cylindrical Equidistant Projection.
Level 4 ProductivityOcean primary production data is available only as binned or mapped Level 4 (i.e. L4) data.Ocean Productivity outputs are averaged weekly or yearly. Like the L3 data, the L4 data is organized spatially as either 4km ISEAG gridded bins or as maps using a Cylindrical Equidistant Projection. The mapped data products are available in a choice of 4km , 39km, or 1 degree spatial resolutions. More than one model is used for deriving these data products and some quality statistics are available.
DAILYPGE208-DAYPGE54MONTHLYPGE73YEARLYPGE74PGE51L2L3L3L3L3L3L3L3L3L3L3L3L3L4L4L4L4L3L3L3L3L4L4L4L4PGE52L4DATA BINNING PATHWAYSOcean Color & SSTOcean Primary Productivity1 km 4.6 km 4.9km 39km 1 =111 km Swath ISEAG Linear Linear Linear Binned Maps
SeaWifs, April 24, 1999Thanks to Seelye Martion
July 17th, 2003Aug 3rd, 2003
http:/sal.ocean.washington.edu (my lab web-site)
http://learn.arc.nasa.gov/http://www.earth.nasa.gov/
Flying
Miles G. Logsdon, University of Washington, School of Oceanography, [email protected] agenda is to offer an overview of the concepts of Remote Sensing and Image Processing with specific applications to ocean and coastal environments.These are the people that can offer a much more detail understanding of the subject.At the root enjoying your work in Remote Sensing is to enjoy looking an pictures.Here are the formal definitions of Remote Sensing and Image processing. Note the words which Ive highlighted.Well be concern primarily with the second source of radiations the passive reflected light Remote Sensing data is received from the satellite and processed into image files based upon an index of path and rows over the earths surface Paths (numbered east to west) follow the path of the satellite or swath over the earths surface, while Rows (number north to south) divide the swath into image scenes.Classified LandcoverNormalized Difference Vegetation IndexLand surface TemperatureA time series Visible light spectrum and the additive (combining color sources) Subtractive (absorb color)Our eye is a remote sensing instrument. Passive radiation from the sun reflects of the leaf (while some energy is absorbed) and the return is the spectral signature.The light has to travel through the atmosphere twice and is affected by the angle of the sun and the view angle of the sensor.- Absorption, - Scattering, - Emission.The sensors measures both the added radiance from the scattering of light from the atmospheric composition and the absorption of light as well.Our main Atmospheric correction is concerned with Rayleigh scatteringThe shape of the Atmospheric particle affects the scatteringNote the affects of scattering as a function of wavelengthSurface roughness influences the direction and amount of reflectionsThese are the types of surfaces we must deal with when investigating the reflective properties various materialsPIXEL: the spatial unit for the measurement of reflected light by remote sensing instrument (the resolutions)The 1-D histogram and the 2-D scatterplot map pixel values by wavelength bands into spectral space.The ocean color sensors are primarily designed to investigate the visible part of the EM spectrumNames for band combinations: true color, false color, pseudo-colorSources and destinations of data in the binning and mapping process.