Changes between Version 2 and Version 3 of Processing/GDALVRTMosaic


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Timestamp:
Apr 8, 2015 4:22:48 PM (4 years ago)
Author:
dac
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  • Processing/GDALVRTMosaic

    v2 v3  
    1 The steps below describe an easy way of creating mosaics from mapped hyperspectral files, making use of the command line GDAL utilities. They can be installed on Windows through [http://trac.osgeo.org/osgeo4w/ OSGeo4W], and are available on Linux through the package manager (e.g., yum, apt-get). 
     1The steps below describe an easy way of creating mosaics from mapped hyperspectral files, making use of the command line GDAL utilities. They can be installed on Windows through [http://trac.osgeo.org/osgeo4w/ OSGeo4W], and are available on Linux through the package manager (e.g., yum, apt-get).
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    33The initial mosaic is a 'virtual raster', which comprises a text file with links to other files containing the data. It is created using the [http://www.gdal.org/gdalbuildvrt.html gdalbuildvrt] command, available with GDAL and also in QGIS through the Raster, Miscellaneous menu.
     
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    22 Standard GeoTiff's aren't compressed so areas outside the flightlines, which have no data, will take up as much space as pixels with data. You can reduce the file size by using compression. You can tell gdal_translate to create a compressed GeoTiff by passing in a creation option flag for example:
     22Note, as all the flightlines use a slightly different grid a nearest neighbour interpolation will be preformed to create a common grid. Standard GeoTiff's aren't compressed so areas outside the flightlines, which have no data, will take up as much space as pixels with data. You can reduce the file size by using compression. You can tell gdal_translate to create a compressed GeoTiff by passing in a creation option flag for example:
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    2424{{{