REMOTE SENSING DATA

Markus Törmä

Institute of Photogrammetry and Remote Sensing

Helsinki University of Technology

Markus.Torma@hut.fi

ROLE OF REMOTE SENSING

• Inventory of larger areas

Determination of surface properties

Determination of surface topography

• Monitoring environmental change

• Visualization

SATELLITE IMAGESLandsat• Enhance Thematic Mapper 29.1.1999• Thematic Mapper 1.9.1990• MultiSpectral Scanner 12.7.1983 and 27.6.1975

Quickbird• 15.7.2003

CORONA• 3 images taken 28.6.1966 and 22.1.1967

LANDSAT ETM• Image size 185 x 185 km2

• 6 visual and near-infrared channels (spatial resolution30m)

1. 0.45 - 0.52 m

2. 0.52 - 0.60 m

3. 0.63 - 0.69 m

4. 0.76 - 0.90 m

5. 1.55 - 1.75 m

7. 2.08 - 2.35 m

• Channel 6 thermal infrared: 10.4 - 12.5 m (60m)

• Panchromatic channel: 0.50 - 0.90 m (15m)

• Channels can be combined to form color images: true color (RGB: 321) and false color (RGB 741)

• Effect of spatial resolution: detail from panchromatic (15m) and color image (30m)

LANDSAT TM• Similar than ETM

• ETM 741 29.1.1999 vs. TM 741 1.9.1990

LANDSAT MSS• 4 channels

• MSS 12.7.1983 and MSS 27.6.1975

LANDSAT• Sandy soils: ch7 / ch1

• Sandy soils 1.9.1990, sandy soils 29.1.1990 and change image (Red: more sand in 1999, green: more sand in 1990)

NOTE: Images have been taken during different seasons, therefore the change can be due to seasonal effects like changing soil moisture

LANDSAT• Satellite image as base map

• Landsat ETM pan and archaeological sites

Colours:Red: Stone cairn (s) / tumulus / tumuliBlue: Shepherd´s / hunter´s rock shelter Bright green: Stone heap(s) / Muslim grave(s)Beige: Abandoned Bedouin camp / tentOrange: Open accumulated pottery sherd concentrationPink: Rectangular structure

QUICKBIRD• 4 channels (blue, green, red, NIR, 2.44m), PAN 0.61m

• Image size 16.5 x 16.5 km2

CORONA• Panchromatic film which is digitized

• Image size 188 x 14 km2 on the ground

• Spatial resolution 2m in the best case

DIGITAL ELEVATION MODELS

STRM-DEM• Shuttle Radar Topography Mapping mission 2000• Based on SAR interferometry• 30m pixel DEM covers area partially

Provided by DLR• 90m pixel DEM whole area

ASTER-DEM• Optical ASTER-instrument in Terra satellite• 30m pixel

DIGITAL ELEVATION MODELS• Areal coverage of

different DEMs

• Red: SRTM-DEM, 30m pixel

• Green and Blue: ASTER-DEM, 30m pixel

• Other areas: SRTM-DEM, 90m pixel

VISUALIZATION• Unsupervised classification of ETM + DEM

VISUALIZATION• MSS 1983 + SRTM-

DEM 90m

FREE DATAGlobal Land Cover Facility• University of Maryland• http://glcf.umiacs.umd.edu/• Landsat ETM, TM, and MSS images• SRTM-DEM 90m

Earth Observing System data Gateway• United States Geological Survey• http://edcimswww.cr.usgs.gov/pub/imswelcome/• ASTER-DEM