Leica LIDAR Solutions ALS70 Product Line Overvie · Leica LIDAR Solutions ALS70 Product Line Overview 28 April 2011. ALS70_Overview_110428.ppt ROTR 110428 Content ... S c a n Produ

ROTR 110428ALS70_Overview_110428.ppt

Leica LIDAR SolutionsALS70 Product Line Overview

28 April 2011


Content

What is LIDAR? What is ALS70? For customers considering upgrade from ALS60 For customers considering competing sensors


ALS70 Product Line OverviewElements of a generic LIDAR system


Generic LIDAR: hardware


Generic LIDAR: workflow to get “points on the ground”

GNSS

IMU

Scan Angle Encoding

Range counting

electronics

Laser

Optics

Where was the system when the

laser fired?

Where was the laser pointed when it fired?

How far is it to the ground?

Location of point on the

groundFires pulse

Filter

Detector

Collects sample of

laser output and return reflection


Generic LIDAR: the point cloud

Not a rasterRepresents XYZ points measuredCan be more than one point per outbound laser shotTypically color coded by Elevation Return number Intensity Class Flight line


ALS70 Product Line OverviewWhat is ALS70?


Trends in airborne LIDAR capabilities (1)

LIDAR systems historically double point measurement rate (i.e., pulse rate) roughly every 2 years

Recent product introductions (up to 500 kHz measurement rate) are on that trajectory

Until recently, scan rates have not kept up with advances in pulse rate, limiting the swath over which evenly-spaced (along-track versus cross-track) point patterns could be generated

010002000300040005000

1998

2000

2002

2004

2006

2008

2010

Scan

Pro

duct

(o -Hz

@ 4

0 FO

V)


Trends in airborne LIDAR capabilities (2)

Combination of high measurement rate and high scan rate in latest systems results in ability to scan reasonable swath at high point density

Fusion of return-signal intensity data with elevation data in high-point-density point clouds provide interesting possibilities Intensity and location are both part

of each point in the point cloud A “true ortho” results automatically ~20 cm spatial resolution is readily

achieved


What is ALS70?

A family of airborne LIDAR systems Covers the full competitive range at all levels

ALS70-CM “City Mapper”: high point density at entry-level pricing ALS70-HP “High Performance”: high point density with greater flying height ALS70-HA “High Altitude”: single-output system for high-altitude applications


ALS70 major components (ALS70-CM / ALS70-HP shown)

LS70-LP Laser Scanner (shown)orLS70-HA Laser Scanner

SC70 System ControllerorSC70-CM System Controller

LC60 Laser Controller

OC50 Pilot Display

GI40 Guidance IndicatorOC52 Operator Display

MM70 Mass Memory


ALS70 system configurations

LS70-LPLS70-HA

SC70SC70-CM

ALS70-HPALS70-CMALS70-HA

Scanner

System Controller

MPiA

SPiA

SPiA & MPiA

SPiA & MPiA

5000 m AGL

3500 m AGL

2500 m AGL

1600 m AGL


ALS70 system configurations

LS70-LPLS70-HA

SC70SC70-CM

ALS70-HPALS70-CMALS70-HA

Scanner

System Controller

SPiA & MPiA

SPiA

SPiA & MPiA

SPiA & MPiA

5000 m AGL

3500 m AGL

2500 m AGL

1600 m AGL


ALS70 - capabilities

Intensity image, 11 Mar 2011, 2300 m AGL, 40 deg FOV (sine), 25 Hz scan rate, 119 kHz pulse rate (MPiA), installed on PAV80 mount, 2 points/m2 (~70 cm post spacing)


ALS70 - capabilities

Fused class/intensity image, September 2010, 1000 m AGL, 40 deg FOV (sine), 25 Hz scan rate, 500 kHz pulse rate (MPiA), ~10 points/m2, 870 m swath


Major new technologies in ALS70

Point Density Multiplier – doubling productivity New range counting circuitry

Low electronic “overhead”, allowing pulse rates closer to the “speed of light” limit for given flying height (all models)

25% reduction in number of PCBs Dual-output scanner (ALS70-CM and ALS70-HP only) doubles effective pulse rate

and scan rate Single laser Single galvanometer scanner Single receiver optics Laser output split into two beams (slight forward and slight rearward look

angle) Dual receivers Autoscan feature monitors flying height and speed over round and adjusts

scan rate to help to keep scan patterns out-of-phase with one another (see separate ppt for details)

Multiple scan patterns (sine, triangle and raster) for greater flexibility in point pattern on ground

Increased receiver bandwidth and dynamic range, for better detection of small and/or low-reflectivity surfaces (e.g., power lines, fresh asphalt)


Single-path scanning limits along-track spacing


Dual-output scanning doubles scan rate, pulse rate


SPiA technology limits pulse rate

1 3 5

2 4


MPiA technology allows doubling of pulse rate

1 3

3

52

2

4

4 5


Multiple scan patterns for maximum flexibility


ALS70 family – additional features

Laser features consistent pulse shape over wide range of pulse rates for high range accuracy/low range jitter

High-accuracy scan angle encoder preserves planimetric accuracy as altitude increases

Powerful galvanometer scanner Allows use of large-aperture optics Scans fast at any given FOV, allowing:

Small along-track spacing in fixed wing aircraft Balanced along-track and cross-track (very important when using high

pulse rates and/or higher-speed aircraft) Allows widest available FOV and greatest roll compensation range

3 AUX sensor ports for connection of additional devices e.g., RCD30, infrared imagers, hyperspectral, etc. Provides 1 PPS pulse, trigger output, MEP inputs, LAN connections Limited power available (unfiltered 28 VDC)


ALS70 family – mounting configurations (ALS70-CM/HP shown)

ALS only

ALS with / without RCD, Dart pod

ALS with / without RCD on PAV80

ALS with / without RCD, low profile

In pod

In cabin


ALS70 real-time digital camera enhances editing

Real-time imagery to check for clouds / haze in line of sight

JPEG images recorded at preset interval for post flight terrain / cover verification

Images time-indexed and contain all georeferencing data

Leica LCam Viewer software allows easy image look-up


Real-time coverage verification: easy tracking of progress

Feature provided in parallel TracGUI software running on OC5x Loads project site outline file

and/or flight line file (*.shp format)

Records real-time aircraft location and orientation

Creates projection of swath at the ground using real-time ALS Post Processor core algorithm

Records each swath for export (*_1.las format)

Swath files can be re-loaded for use on subsequent days

5 updates per second Variety of auto/manual

zoom/pan functions Similar “coverage estimator”

feature built into FCMS Module Sensor Control ALS


ALS70 family – RCD30 typical mounting

CH6x Camera Head

Integral mounting for CC31


ALS70 Product Line OverviewALS70 Workflow


ALS70 workflow: planning to point cloud under one roofPlanning Collection Ground Processing

FPES

AeroPlan70

FCMS

IPAS TC

IPAS CO

IPAS BST

ALSpp


ALS70 workflow

FPES / AeroPlan70

Mission Planning

modealtitudescan rateFOVflight speedflight linesflight height

record DGPS base station data

Airborne Operations

record position and attitude data•GPS•IMU

record scanner data•range•scan angle•intensity•timing info

extract position

and attitude

data

DGNSS processing

trajectoryprocessing

•point cloud generation•output formatting – LDI, LAS, ASCII•projection - WGS 84, UTM, state plane, Swiss, TW 97, user- supplied•datum (state plane only) - NGVD 29, NAVD 88

•tiling•coverage verification•outlier removal•bare earth•thinning•catenary generation

deliverables

Ground Operations

Planning Collection Processing

real-time nav file

*.SCN raw scanner files

ALS, FCMS

IPAS TC IPAS TC

ALS Post Processor

position and

attitude file

GPS

TerraScan

IPAS TC

MicroStation

•TIN/contour•control report

TerraModeller

laser boresitecalibration

Attune

“LAS” file


ALS70 workflow (additional MFC workflow items in amber)

FPES / AeroPlan70

Mission Planning

modealtitudescan rateFOVflight speedflight linesflight heightlens FLshutter speedframe rate

record DGPS base station data

Airborne Operations

record position and attitude data•GPS•IMU•event marksrecord scanner data•range•scan angle•intensity•timing info

record camera data•photo ID file•raw frames

extract position

and attitude

data

DNSS processing

trajectoryprocessing

•point cloud generation•output formatting – LDI, LAS, ASCII•projection - WGS 84, UTM, state plane, Swiss, TW 97, user- supplied•datum (state plane only) - NGVD 29, NAVD 88

•tiling•coverage verification•outlier removal•bare earth•thinning•catenary generation

deliverables

Ground Operations

Planning Collection Processing

real-time nav file

*.SCN raw scanner files

ALS, FCMS, RCD

IPAS TC IPAS TC

ALS Post Processor

position and

attitude file

GPS

TerraScan

IPAS TC

MicroStation

•TIN/contour•control report

TerraModeller

laser boresitecalibration

Attune

calculate exterior

orientations

EO fileIPAS CO

camera boresight, orthophoto generation

IPAS BST

“LAS” file

orthophotos

Bayer conversion

FramePro

LPS


ALS70 Product Line OverviewALS70 versus ALS60


For those considering ALS60-CM to ALS70-CM upgrade

Pulse rates ALS70-CM pulse rates 2.5x that of

ALS60-CM ALS70-CM has MPiA capability (not

available in ALS60-CM) ALS70-CM carries 500 kHz

performance to 1107 m AGL @ 40o FOV

ALS70-CM max AGL 1600 m versus 1000 m AGL for ALS60-CM

Scan Rates ALS70 sine rate ~2.0x ALS60 sine

rates New triangle scan pattern ~1.4x - 1.6x

ALS60 sine rates New raster scan pattern ~0.8x ALS60

sine rates

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For those considering ALS60 to ALS70-HP upgrade

Pulse rates ALS70-HP pulse rates 2.5x that of

ALS60 ALS70-HP carries 500 kHz


ALS70-HP SPiA pulse rate higher than ALS60 MPiA pulse rates up to 3500 m AGL

Scan Rates ALS70 sine rate ~2.0x ALS60 sine

rates New triangle scan pattern ~1.4x - 1.6x


sine rates

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For those considering ALS60 to ALS70-HA upgrade

Pulse rates ALS70-HA pulse rates 2.5x that of

ALS60 ALS70-HA carries 500 kHz


ALS70-HA SPiA pulse rate higher than ALS60 MPiA pulse rates up to 3500 m AGL

Scan Rates ALS70-HA sine rate similar to ALS60

sine rates New triangle scan pattern ~0.7x - 0.8x


sine rates

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Upgrading from ALS60 to ALS70


ALS70 Product Line OverviewALS70 versus competing sensors


For those considering ALS70-CM and other systems

Primary competitors LMS-Q680i ALTM Orion C200

Pulse rates ALS70-CM 2x – 3x higher effective

pulse rates than either ALTM Orion C200 or LMS-Q680i

Flying height Significantly higher than ALTM Orion

C200 Fully upgradeable to ALS70-HP!!!

Scan rates ALS70-CM sine rates ~2x – 3x ALTM

Orion C200 ALS70-CM triangle rates ~2x ALTM

Orion C200 ALS70-CM raster rates similar to

ALTM Orion C200 ALS70-CM sine rates same as LMS-

Q680i at small FOV; slow LMS-Q680i pulse rates make it nearly impossible to utilize fast scan rate

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For those considering ALS70-HP and other systems

Primary competitors ALTM Orion M200 ALTM Gemini ALTM Pegasus HD400

Pulse rates ALS70-HP in SPiA has higher pulse rates

and max AGL than even ALTM Pegasus HD400

ALS70-HP in MPiA has ~2x pulse rate of ALTM Pegasus HD400

ALS70-HP pulse rates exceed that of other competitors by even greater margin

Scan rates ALS70-HP sine rates faster than ALTM

Pegasus HD400, ALTM Gemini and ALTM Orion M200

ALS70-HP triangle rates similar to ALTM Pegasus HD400, ~1.4x ALTM Gemini, ~2x ALTM Orion M200

ALS70-HP raster rates similar to ALTM Gemini, ALTM Orion M200

ALS70-HP sine rates same as LMS-Q680i at small FOV; slow LMS-Q680i pulse rates make it nearly impossible to utilize fast scan rate

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For those considering ALS70-HA and other systems

Primary competitors ALTM Orion M200 ALTM Gemini ALTM Pegasus HD400

Pulse rates ALS70-HA in MPiA has higher pulse

rates and max AGL than ALTM Pegasus HD400 above 1000 m AGL and ALTM Gemini at all altitudes

ALS70-HA in SPiA has higher pulse rate than ALTM Orion M200

Max AGL greater than all competitors

Scan rates ALS70-HA sine rates faster than ALTM

Gemini and ALTM Orion M200 over most FOVs

ALS70-HA triangle rates similar to ALTM Orion M200

ALS70-HA raster pattern not available on ALTM Pegasus HD400, ALTM Gemini or ALTM Orion M200

Raster scan pattern is ideal for the larger post spacing typical for high-AGL acquisition

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Thank you!


ALS70 Product Line OverviewAppendix 1 – 12-bit intensity versus ALS70-HP


Using 8 bit intensity + AGC + laser output control

Fixed-gain system must be designed for full-scale (e.g., 12 bit) output @ min AGL Looses 2 bits of full-scale intensity reading with each doubling of altitude

ALS operates differently 8-bit output @ min AGL and minimum laser output Laser output increases from 1% to 100% as altitude increases AGC increases amplification as altitude increases beyond point where laser is at 100% Once AGC is at max gain, full-scale intensity reading will decrease with increasing altitude

It’s all about getting the right 8 bits, rather than any 12 bits

Laser Output Range1% 100%

Add’l AGCGain


ALS70 Product Line OverviewAppendix 2 – Accuracy plots


AeroPlan70 error estimates (40 FOV, 5 cm GPS error) – ALS70-CM


AeroPlan70 error estimates (40 FOV, 5 cm GPS error) – ALS70-HP


AeroPlan70 error estimates (40 FOV, 5 cm GPS error) – ALS70-HA

Documents

Leica LIDAR Solutions ALS70 Product Line Overvie · Leica LIDAR Solutions ALS70 Product Line Overview 28 April 2011. ALS70_Overview_110428.ppt ROTR 110428 Content ... S c a n Produ