Snowy Dove

an IDL program aimed at auto-pre-processing imageries taken by GaoFen(GF)1, GF2 and GF6, in batch mode, and without GUI.

Usage

using IDL script via terminal

$ git clone https://github.com/desertstsung/Snowy-Dove.git $yourdir
$ cd $yourdir
$ idl ./sdRunMain.sh -args i_dir -d dem_fn -r shapefile -cpstnpv

using source code in IDL (workbench)

$ git clone https://github.com/desertstsung/Snowy-Dove.git $yourdir
$ idl # recommended, or idlde
CD, $yourdir/src
.COMPILE sdMain             , sdStructDefine
.COMPILE sdProcessor_PMS    , sdProcessor_GF1_WFV  , sdProcessor_GF6_WFV
.COMPILE sdDecompress       , sdRPCRedefine        , sdRPCWarp
.COMPILE sdSubsetByShp      , sdRadianceCalibration, sdPanSharpen
.COMPILE sdQUAC             , sdQUACDivide         , sdNDVIGenerate
.COMPILE sdConvertToGeoTIFF , sdPyramidCreate      , sdDelTempFiles
.COMPILE sdAddMetadata      , sdDelImageFile       , sdDelTempFiles
.COMPILE sdGetPANMS         , sdLog                , sdLonLatRangeIntersect
.COMPILE sdMosaicGF6        , sdPoint2Underscore   , sdPreLog
.COMPILE sdReadHeader       , sdShpValid           , sdTimeStr
.COMPILE sdValidTempFilename, sdWriteHeader        , sdCommonProcess
RESOLVE_ALL, /CONTINUE_ON_ERROR, SKIP_ROUTINES='envi'
sdMain, tgzdirIn [, DEM=demfn] [, REGION=shpfn] [, /CALI] [, /{QUAC | SCALE}] [, /TIFF] [, /NDVI] [, /PYRAMID] [, /VERBOSE]
; or simply typing:
sdMain, tgzdirIn [, d=demfn] [, r=shpfn] [, /c] [, /{q | s}] [, /t] [, /n] [, /p] [, /v]

• tgzdirIn : directory where *.tar.gz files are
• DEM(optional) : fn of DEM used to orthoretcify images
• REGION(optional) : fn of shapefile to subset images
• CALI(optional) : keyword to apply radiance calibration
• QUAC(optional) : keyword to apply QUAC
• SCALE(optional) : keyword to multiply 0.0001 to QUAC result
• TIFF(optional) : keyword to convert default ENVI format to TIFF format
• NDVI(optional) : keyword to get an extra NDVI result
• PYRAMID(optional): keyword to build .enp file for outcome
• VERBOSE(optional): keyword to print step in IDL console or terminal

Notice

• IDL8.3/ENVI5.1 or later is required
• make sure you have the license for FLAASH if keyword QUAC or SCALE is set

TODO

• its difficult to find the shapefile is whether inside a certain RPC-based(not orthorectified in another way to say) raster, so its time-cost to orthorectify each tiff file and then determine its location between the shapefile