1i.in.spotvgt(1)             GRASS GIS User's Manual            i.in.spotvgt(1)
2
3
4

NAME

6       i.in.spotvgt  - Imports SPOT VGT NDVI data into a raster map.
7

KEYWORDS

9       imagery, import, NDVI, SPOT
10

SYNOPSIS

12       i.in.spotvgt
13       i.in.spotvgt --help
14       i.in.spotvgt  [-a]  input=name  [output=name]   [--overwrite]  [--help]
15       [--verbose]  [--quiet]  [--ui]
16
17   Flags:
18       -a
19           Also import quality map (SM status map layer) and filter NDVI map
20
21       --overwrite
22           Allow output files to overwrite existing files
23
24       --help
25           Print usage summary
26
27       --verbose
28           Verbose module output
29
30       --quiet
31           Quiet module output
32
33       --ui
34           Force launching GUI dialog
35
36   Parameters:
37       input=name [required]
38           Name of input SPOT VGT NDVI HDF file
39
40       output=name
41           Name for output raster map
42

DESCRIPTION

44       i.in.spotvgt imports SPOT Vegetation (1km, global) NDVI data sets.  Af‐
45       ter  import  the  digital  numbers (DN) are remapped to VEGETATION NDVI
46       values and the NDVI color table is applied. The imported DN map is  re‐
47       moved after remapping.
48
49       Apparently  missing  raster  cells  due to bad pixel quality are recon‐
50       structed by the SPOT operating team in the NDVI file.  The  differences
51       between the filtered (-a flag) and raw NDVI map should be compared.
52

NOTES

54       The  SPOT VGT files are delivered in HDF4 (Hierarchical Data Format Re‐
55       lease 4) format. It is required to have the  GDAL  libraries  installed
56       with HDF4 support.
57
58   Export of entire world SPOT VGT maps
59       When  working with SPOT VGT with entire world extent, it is recommended
60       to zoom to w=180W and e=180E instead of using the map  extent  for  map
61       export.  These  entire  world SPOT VGT data are exceeding -180.0 degree
62       which can lead to unhelpful large East-West coordinates in the exported
63       file.  It  is  also recommended to then use an export command which re‐
64       spects the user settings. Example:
65       # import:
66       i.in.spotvgt 0001_NDV.HDF
67       # export:
68       g.region w=180W e=180E n=75:00:16.071429N s=56:00:16.069919S res=0:00:32.142857 -p
69       r.out.gdal 0001_NDV format=GTiff out=spotndvi.tif
70

SEE ALSO

72        r.in.gdal, r.out.gdal
73

REFERENCES

75       SPOT Vegetation (1km, global) NDVI data set server
76       SPOT Vegetation FAQ
77       1.13 How must I read the 8 bits of the status map? - Quality map
78

AUTHOR

80       Markus Neteler
81

SOURCE CODE

83       Available at: i.in.spotvgt source code (history)
84
85       Accessed: Saturday Jan 21 20:41:00 2023
86
87       Main index | Imagery index | Topics index | Keywords index |  Graphical
88       index | Full index
89
90       © 2003-2023 GRASS Development Team, GRASS GIS 8.2.1 Reference Manual
91
92
93
94GRASS 8.2.1                                                    i.in.spotvgt(1)
Impressum