「Introduction to Radar data processing」の版間の差分

2010年1月28日 (木) 20:29時点における版

PALSAR: Phased Array type L-band Synthetic Aperture Radar
- about system (HTML)
- ERSDAC PALSAR Pamphlet, PDF 8 pages

SAR backscatter analysis (about): enables to estimate volume of water contained in soil, volume of biomass in forests, conditions of waves in the ocean etc.
- Requirements: ...
SAR interferometry processing (about): enables to produce elevation data and to measure topographical change (two SAR images are used - called Master Image and Slave image, respectively)
- Requirements: complex SAR data - Single Look Complex as parallax is not removed
- General steps (cited from CCRS tutorial):
  - Process data to SLC images
  - Register the two images to 1/10 pixel
  - Over-sample by a factor of 2 in both dimensions
  - Filter common bands in spectrum
  - Conjugate multiply to form interferogram
  - Smooth the interferogram
  - Measure coherence
  - Unwrap phase
  - Estimate geometry parameters (especially baseline)
  - Remove flat-earth fringes
  - Convert unwrapped phase to height and/or motion
Polarimetric SAR processing (about): forest fire monitoring, classification of vegetation (height), water content in vegetation, monitoring of snow cover, condition of ice, flood monitoring and soil moisture.
- Requirements: ...

Windows:

1. Download the IDL virtual machine: http://www.ittvis.com/download/download.asp?urlProductCode=10 (select Windows version, then select "I am evaluating", then "Download")
2. Download the RAT binaries and run the installer

Linux:

1. Download the IDL virtual machine: http://www.ittvis.com/download/download.asp?urlProductCode=10 (select Linux version, then select "I am evaluating", then "Download")
2. Download the RAT binaries and unpack them
3. Change into the rat_v0.21/ directory and start RAT with:

    idl -vm=rat.sav

File -> open external -> ALOS-PALSAR (ERSDAC CEOS) -> PASL1500911220116591001270049_ortho.dat
Try to zoom Mount Fuji

This is an orthorectified SAR image, i.e. that no interferometry can be performed.

Exercises: Speckle filtering (see SAR -> Wizard mode), color table adjustments, etc.

@@ 行60: / 行60: @@
 * 3. Change into the rat_v0.21/ directory and start RAT with:
       idl -vm=rat.sav
+==== Radartools usage on PALSAR ====
+# File -> open external -> ALOS-PALSAR (ERSDAC CEOS) -> PASL1500911220116591001270049_ortho.dat
+# Try to zoom Mount Fuji
+This is an orthorectified SAR image, i.e. that no interferometry can be performed.
+Exercises: Speckle filtering (see SAR -> Wizard mode), color table adjustments, etc.
+==== GRASS GIS usage on PALSAR====
+# Start 'grass64 -wx' or from menu (graphical user interface)
+#
 === Sample data ===