<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> <title>GRASS GIS: i.in.spotvgt</title> <meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1"> <link rel="stylesheet" href="grassdocs.css" type="text/css"> </head> <body bgcolor="white"> <img src="grass_logo.png" alt="GRASS logo"><hr align=center size=6 noshade> <h2>NAME</h2> <em><b>i.in.spotvgt</b></em> - Import of SPOT VGT NDVI file into a raster map <h2>KEYWORDS</h2> raster, imagery, import <h2>SYNOPSIS</h2> <b>i.in.spotvgt</b><br> <b>i.in.spotvgt help</b><br> <b>i.in.spotvgt</b> [-<b>a</b>] <b>file</b>=<em>string</em> [<b>rast</b>=<em>string</em>] [--<b>overwrite</b>] [--<b>verbose</b>] [--<b>quiet</b>] <h3>Flags:</h3> <DL> <DT><b>-a</b></DT> <DD>also import quality map (SM status map layer) and filter NDVI map</DD> <DT><b>--overwrite</b></DT> <DD>Allow output files to overwrite existing files</DD> <DT><b>--verbose</b></DT> <DD>Verbose module output</DD> <DT><b>--quiet</b></DT> <DD>Quiet module output</DD> </DL> <h3>Parameters:</h3> <DL> <DT><b>file</b>=<em>string</em></DT> <DD>existing SPOT VGT NDVI HDF file (0001_NDV.HDF)</DD> <DT><b>rast</b>=<em>string</em></DT> <DD>Name for output raster map</DD> </DL> <h2>DESCRIPTION</h2> <em>i.in.spotvgt</em> 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. <P> 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. <h2>NOTES</h2> 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. <h3>Export of entire world SPOT VGT maps</h3> When working with SPOT VGT with entire world extent, it is recommended to zoom to <i>w=180W</i> and <i>e=180E</i> 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: <div class="code"><pre> # 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.tiff -t 0001_NDV out=spotndvi </pre></div> <h2>SEE ALSO</h2> <em> <a HREF="r.in.gdal.html">r.in.gdal</a> </em> <H2>REFERENCES</H2> <a href="http://free.vgt.vito.be/">SPOT Vegetation (1km, global) NDVI data set server</a><br> <a href="http://www.vgt.vito.be/faq/faq.html">SPOT Vegetation FAQ</a><br> <a href="http://www.vgt.vito.be/faq/FAQS/faq15.html">SPOT Vegetation Status Map (SM)</a> - Quality map <h2>AUTHOR</h2> Markus Neteler</a> <p><i>Last changed: $Date: 2008-03-18 16:54:11 +0100 (Tue, 18 Mar 2008) $</i> <HR> <P><a href="index.html">Main index</a> - <a href="imagery.html">imagery index</a> - <a href="full_index.html">Full index</a></P> <P>© 2003-2008 <a href="http://grass.osgeo.org">GRASS Development Team</a></p> </body> </html>
