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PROGRAM:

NAME


i.in.spotvgt - Imports SPOT VGT NDVI data into a raster map.

KEYWORDS


imagery, import

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. 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.gdal 0001_NDV format=GTiff out=spotndvi.tif

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