20081027 Remote Sensing1

Remote sensingRemote sensingIntroduction, application Introduction, application

and examplesand examples

What can we use it for?What can we use it for?

►►Mapping Mapping (geologic mapping(geologic mapping…… etc.)etc.)

►►Monitor Monitor (Tectonic deformation, deforest.. etc.)(Tectonic deformation, deforest.. etc.)

►►Quick response Quick response (Hazard estimations(Hazard estimations…… etc.)etc.)

►►Generate DEM Generate DEM

Common types in Remote SensingCommon types in Remote Sensing

►►Active systemActive system RadarRadar LidarLidar SonarSonar

►►Passive systemPassive system Aerial photoAerial photo Satellite imageSatellite image

Common types in Remote SensingCommon types in Remote Sensing

►►Active systemActive system RadarRadar LidarLidar SonarSonar

►►Passive systemPassive system Aerial photoAerial photo Satellite imageSatellite image

What do we need to know..What do we need to know..

►►Image AcquisitionImage Acquisition

►►Image ProcessingImage Processing

►►Image InterpretationImage Interpretation

What do we need to know..What do we need to know..

►►Image AcquisitionImage Acquisition

►►Image ProcessingImage Processing

►►Image InterpretationImage Interpretation

Across-Track Scanner

Push-broom Scanner

Framing Camera

PCI

ENVI

ERDAS IMAGINE

Matlab, IDL… etc.

What do we need to know..What do we need to know..

►►Image AcquisitionImage Acquisition

►►Image ProcessingImage Processing

►►Image InterpretationImage Interpretation

What do we need to know..What do we need to know..

►►Image AcquisitionImage Acquisition

►►Image ProcessingImage Processing

►►Image InterpretationImage InterpretationYour brain

Tools

http://rst.gsfc.nasa.gov/Sect2/Sect2_3.html

Satellites you should knowSatellites you should know

►►LandsatLandsat►►Terra (ASTER)Terra (ASTER)►►MODISMODIS►►SPOTSPOT►►IKONOSIKONOS►►QuickbirdQuickbird

You can find more information fromhttp://www.satimagingcorp.com/

Satellites you should knowSatellites you should know

►►LandsatLandsat (15 (15 –– 120m)120m)►►Terra (ASTER)Terra (ASTER) (15 (15 –– 90m)90m)►►MODISMODIS (250 (250 –– 1000m)1000m)►►SPOTSPOT (2.5 (2.5 –– 20m)20m)►►IKONOSIKONOS (1.0 (1.0 –– 4.0m)4.0m)►►QuickbirdQuickbird (0.6 (0.6 –– 2.4m)2.4m)

You can find more information fromhttp://www.satimagingcorp.com/

Swath (km)

Res

olut

ion

(m)

Please keep in mind..Please keep in mind..

►► Satellite image Satellite image ≠≠ PhotoPhoto

►► Image color Image color ≠≠ real colorreal color

(CORONA) (Quick Brid, from Google Map)

FORMOSAT – 2 (Panchromatic, 2m)

FORMOSAT – 2 (Multispectral, 8m)

FORMOSAT – 2 (Pan image, 2m)

Satellite image correctionSatellite image correction

http://www.spot.com/

Please keep in mind..Please keep in mind..

►► Satellite image Satellite image ≠≠ PhotoPhoto

►► Image color Image color ≠≠ real colorreal colorLandsat 7

(ETM+ sensor)Wavelength

(micrometers)Resolution

(m)

Band 1 0.45 - 0.515 30 Blue

Band 2 0.525 - 0.605 30 Green

Band 3 0.63 - 0.69 30 Red

Band 4 0.75 - 0.90 30 Near IR

Band 5 1.55 - 1.75 30 Mid IR

Band 6 10.40 - 12.5 60 Thermal

Band 7 2.09 - 2.35 30 Mid IR

Pan Band .52 - .90 15 VIN – Near IR

http://landsat.gsfc.nasa.gov/education/compositor/

True Color

http://landsat.gsfc.nasa.gov/education/compositor/

False Color

http://rst.gsfc.nasa.gov/Sect2/Sect2_1.html

Landsat 7 (ETM+ sensor)

Wavelength(micrometers)

Band 1 0.45 - 0.515 B

Band 2 0.525 - 0.605 G

Band 3 0.63 - 0.69 R

Band 4 0.75 - 0.90 N IR

Band 5 1.55 - 1.75 M IR

Band 6 10.40 - 12.5 Th

Band 7 2.09 - 2.35 M IR

Pan Band .52 - .90

ASTER (sensor) Wavelength(micrometers)

B1 VNIR_Band1 0.52 - 0.60

B2 VNIR_Band2 0.63 - 0.69

B3 VNIR_Band3N/B 0.76 - 0.86

B5 SWIR_Band4 1.60 - 1.70

B6 SWIR_Band5 2.145 - 2.185

B7 SWIR_Band6 2.185 - 2.225

B8 SWIR_Band7 2.235 - 2.285

B9 SWIR_Band8 2.295 - 2.365

B10 SWIR_Band9 2.36 - 2.43

B11 TIR_Band10 8.125 - 8.475

B12 TIR_Band11 8.475 - 8.825

B13 TIR_Band12 8.925 - 9.275

B14 TIR_Band13 10.25 - 10.95

B15 TIR_Band14 10.95 - 11.65

http://www.ersdac.or.jp/ASTERimage/Image/023_SAF.jpg

False Color

RGB = 321

R = N-IRG = RedB = Green

http://www.ersdac.or.jp/ASTERimage2/Image/06.JPG

False Color

RGB = 231

R = RedG = N-IRB = Green

Try yourselfTry yourself

►► Open the LANDSAT and ASTER image in ENVIOpen the LANDSAT and ASTER image in ENVI►► Make a false color imageMake a false color image►► Output your image to ArcOutput your image to Arc--MapMap

Work with ENVIWork with ENVI

Open LANDSATOpen LANDSAT

RGB = 321RGB = 321

RGB = 321 RGB = 753

321

731

Output the Output the GeotiffGeotiff

Make a panMake a pan--sharpening imagesharpening image

LANDSAT-7 Band 8 (15m) LANDSAT-7 Band 3 (30m)

Make a panMake a pan--sharpening imagesharpening image

LANDSAT-7 15m Color (Pan) LANDSAT-7 30m RGB (7,3,1)

Make a panMake a pan--sharpening imagesharpening image

B/WHigh-Res

ColorLow-Res

Intensity Color info

Coloredimage

Make a panMake a pan--sharpening imagesharpening image

B/WHigh-Res

ColorLow-Res

Intensity Color info

Coloredimage

Make a panMake a pan--sharpening imagesharpening image

B/WHigh-Res

ColorLow-Res

Intensity Color info

Coloredimage

Make a panMake a pan--sharpening imagesharpening image

Open ASTEROpen ASTER

RGB = 321

RGB = 231

OrthorectifyOrthorectify image (L1B image (L1B --> Ortho)> Ortho)

ASTER Level-1BASTER Ortho