i.in.spotvgt(1)

1i.in.spotvgt(1)               Grass User's Manual              i.in.spotvgt(1)
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NAME

6       i.in.spotvgt  - Import of SPOT VGT NDVI file into a raster map
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KEYWORDS

9       raster, imagery, import
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SYNOPSIS

12       i.in.spotvgt
13       i.in.spotvgt help
14       i.in.spotvgt  [-a]  file=string  [rast=string]   [--overwrite]  [--ver‐
15       bose]  [--quiet]
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17   Flags:
18       -a
19           also import quality map (SM status map layer) and filter NDVI map
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21       --overwrite
22           Allow output files to overwrite existing files
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24       --verbose
25           Verbose module output
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27       --quiet
28           Quiet module output
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30   Parameters:
31       file=string
32           existing SPOT VGT NDVI HDF file (0001_NDV.HDF)
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34       rast=string
35           Name for output raster map
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DESCRIPTION

38       i.in.spotvgt imports SPOT Vegetation  (1km,  global)  NDVI  data  sets.
39       After  import  the digital numbers (DN) are remapped to VEGETATION NDVI
40       values and the NDVI color table is applied.  The  imported  DN  map  is
41       removed after remapping.
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43       Apparently  missing  raster  cells  due to bad pixel quality are recon‐
44       structed by the SPOT operating team in the NDVI file.  The  differences
45       between the filtered (-a flag) and raw NDVI map should be compared.
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NOTES

48       The  SPOT  VGT  files  are  delivered in HDF4 (Hierarchical Data Format
49       Release 4) format. It is required to have the GDAL libraries  installed
50       with HDF4 support.
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52   Export of entire world SPOT VGT maps
53       When  working with SPOT VGT with entire world extent, it is recommended
54       to zoom to w=180W and e=180E instead of using the map  extent  for  map
55       export.  These  entire  world SPOT VGT data are exceeding -180.0 degree
56       which can lead to unhelpful large East-West coordinates in the exported
57       file.  It  is  also  recommended  to  then  use an export command which
58       respects the user settings. Example:
59       # import:
60       i.in.spotvgt 0001_NDV.HDF
61       # export:
62       g.region   w=180W    e=180E    n=75:00:16.071429N    s=56:00:16.069919S
63       res=0:00:32.142857 -p
64       r.out.tiff -t 0001_NDV out=spotndvi
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REFERENCES

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

76       Markus Neteler
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78       Last changed: $Date: 2008-03-18 16:54:11 +0100 (Tue, 18 Mar 2008) $
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80       Full index
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82       © 2003-2008 GRASS Development Team
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86GRASS 6.3.0                                                    i.in.spotvgt(1)