xenial (1) i.in.spotvgt.1grass.gz

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

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

       Last changed: $Date: 2013-05-11 15:23:40 +0200 (Sat, 11 May 2013) $

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