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i.in.spotvgt
Langue: en
Version: 370795 (fedora - 01/12/10)
Section: 1 (Commandes utilisateur)
Sommaire
NAME
i.in.spotvgt - Import of SPOT VGT NDVI file into a raster mapKEYWORDS
raster, imagery, importSYNOPSIS
i.in.spotvgti.in.spotvgt help
i.in.spotvgt [-a] file=string [rast=string] [--overwrite] [--verbose] [--quiet]
Flags:
- -a
also import quality map (SM status map layer) and filter NDVI map- --overwrite
Allow output files to overwrite existing files- --verbose
Verbose module output- --quiet
Quiet module output
Parameters:
- file=string
existing SPOT VGT NDVI HDF file (0001_NDV.HDF)- rast=string
Name for output raster map
DESCRIPTION
i.in.spotvgt imports SPOT Vegetation (1km, global) NDVI data sets. After import the digital numbers (DN) are remapped to VEGETATION NDVI values and the NDVI color table is applied. The imported DN map is removed after remapping.Apparently missing raster cells due to bad pixel quality are reconstructed by the SPOT operating team in the NDVI file. The differences between the filtered (-a flag) and raw NDVI map should be compared.
NOTES
The SPOT VGT files are delivered in HDF4 (Hierarchical Data Format Release 4) format. It is required to have the GDAL libraries installed with HDF4 support.Export of entire world SPOT VGT maps
When working with SPOT VGT with entire world extent, it is recommended to zoom to w=180W and e=180E instead of using the map extent for map export. These entire world SPOT VGT data are exceeding -180.0 degree which can lead to unhelpful large East-West coordinates in the exported file. It is also recommended to then use an export command which respects the user settings. Example:# import:
i.in.spotvgt 0001_NDV.HDF
# export:
g.region w=180W e=180E n=75:00:16.071429N s=56:00:16.069919S res=0:00:32.142857 -p
r.out.tiff -t 0001_NDV out=spotndvi
SEE ALSO
r.in.gdalREFERENCES
SPOT Vegetation (1km, global) NDVI data set serverSPOT Vegetation FAQ
SPOT Vegetation Status Map (SM) - Quality map
AUTHOR
Markus NetelerLast changed: $Date: 2008-03-18 16:54:11 +0100 (Tue, 18 Mar 2008) $
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