Rechercher une page de manuel

Chercher une autre page de manuel:

Langue: en

Version: 334289 (ubuntu - 24/10/10)

Section: 1 (Commandes utilisateur)

NAME - Import of SPOT VGT NDVI file into a raster map


raster, imagery, import

SYNOPSIS help [-a] file=string [rast=string] [--overwrite] [--verbose] [--quiet]



also import quality map (SM status map layer) and filter NDVI map

Allow output files to overwrite existing files

Verbose module output

Quiet module output



existing SPOT VGT NDVI HDF file (0001_NDV.HDF)

Name for output raster map

DESCRIPTION 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.


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: 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



SPOT Vegetation (1km, global) NDVI data set server
SPOT Vegetation FAQ
SPOT Vegetation Status Map (SM) - Quality map


Markus Neteler

Last changed: $Date: 2008-03-18 16:52:28 +0100 (mar, 18 mar 2008) $

Full index

© 2003-2010 GRASS Development Team

La religion catholique est une méthode pour obtenir le ciel en mendiant.
Mais comme il est trop difficile à obtenir, les prêtres servent
-+- Arthur Schopenhauer -+-