i.in.spotvgt(1grass) GRASS GIS User's Manual i.in.spotvgt(1grass)
NAME
i.in.spotvgt - Imports SPOT VGT NDVI data into a raster map.
KEYWORDS
imagery, import, NDVI, SPOT
SYNOPSIS
i.in.spotvgt
i.in.spotvgt --help
i.in.spotvgt [-a] input=name [output=name] [--overwrite] [--help]
[--verbose] [--quiet] [--ui]
Flags:
-a
Also import quality map (SM status map layer) and filter NDVI map
--overwrite
Allow output files to overwrite existing files
--help
Print usage summary
--verbose
Verbose module output
--quiet
Quiet module output
--ui
Force launching GUI dialog
Parameters:
input=name [required]
Name of input SPOT VGT NDVI HDF file
output=name
Name for output raster map
DESCRIPTION
i.in.spotvgt imports SPOT Vegetation (1km, global) NDVI data sets. Af-
ter import the digital numbers (DN) are remapped to VEGETATION NDVI
values and the NDVI color table is applied. The imported DN map is re-
moved after remapping.
Apparently missing raster cells due to bad pixel quality are recon-
structed 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 Re-
lease 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 re-
spects 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.gdal 0001_NDV format=GTiff out=spotndvi.tif
SEE ALSO
r.in.gdal, r.out.gdal
REFERENCES
SPOT Vegetation (1km, global) NDVI data set server
SPOT Vegetation FAQ
1.13 How must I read the 8 bits of the status map? - Quality map
AUTHOR
Markus Neteler
SOURCE CODE
Available at: i.in.spotvgt source code (history)
Accessed: unknown
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GRASS 7.8.7 i.in.spotvgt(1grass)
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