Changes between Version 3 and Version 4 of Processing/aplquickstart


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Timestamp:
Feb 8, 2012 2:49:52 PM (7 years ago)
Author:
mark1
Comment:

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  • Processing/aplquickstart

    v3 v4  
    3838
    3939== Gridding the data ==
     40
     41We now have per-pixel geolocation information in the required projection. The next and final stage of the mapping procedure is to resample the level 1 data into a regular grid based on the projection information.
     42
     43The two things we need to decide on are:
     44 * what is a suitable pixel size for the output grid?
     45 * which of the bands do we wish to map?
     46
     47We can use the [http://arsf-dan.nerc.ac.uk/pixelsize/pixelsize.html pixel size estimator] to get an idea of the approximate spatial resolution of the data or we can use a different size if we wish. Let us say we want to map using square pixels with 2 metres resolution to match up with some external data we have.
     48
     49If we wish to map all bands of the level 1 data, and write the data to a file named {{{flightline1_mapped.bil}}} then we can use a command such as:
     50
     51{{{
     52aplmap -igm my_outputs/flightline1_utm31.igm -lev1 flightlines/level1b/flightline1.bil -mapname my_outputs/flightline1_mapped.bil -pixelsize 2 2 -bandlist ALL
     53}}}
     54
     55Or if we only want to map a selection of bands, say bands 100 to 150 inclusive, we can use a command such as:
     56
     57{{{
     58aplmap -igm my_outputs/flightline1_utm31.igm -lev1 flightlines/level1b/flightline1.bil -mapname my_outputs/flightline1_mapped.bil -pixelsize 2 2 -bandlist 100-150
     59}}}