Changes between Initial Version and Version 1 of Processing/aplquickstart


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Timestamp:
Feb 8, 2012 2:28:36 PM (7 years ago)
Author:
mark1
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  • Processing/aplquickstart

    v1 v1  
     1= Airborne Processing Library - Quick Start =
     2
     3This is a short guide aimed at getting users geocorrecting their data straight away. For more in depth information please refer to the APL mapping user guide pdf.
     4
     5== Creating an IGM file ==
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     7An IGM file is a file that contains per-pixel latitude, longitude and height information, and relates directly to the level 1 file. Using the data contained in an ARSF delivery this can be done using the following command for an Eagle image, where the level 1 data file is named {{{flightline1.bil}}} and the output IGM file will be called {{{flightline1.igm}}}. The DEM used is the ASTER DEM as provided with the hyperspectral delivery.
     8
     9{{{
     10aplcorr -lev1file flightlines/level1b/flightline1.bil -igmfile my_output/flightline1.igm -vvfile sensor_FOV_vectors/eagle_fov_fullccd_vectors.bil -navfile flightlines/navigation/flightline1_nav_post_processed.bil -dem dem/GB11_00-ASTER.dem
     11}}}
     12
     13We now have per-pixel longitude and latitude values for the level 1 data of file {{{flightline1.bil}}}. But say we want to map the data to a different coordinate system. For this we need to re-project the IGM data.
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     15== Reprojection from Geographic Latitude / Longitude ==
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     17Reprojection is done in APL using the apltran software. This uses the open source PROJ libraries for performing the reprojection. There are 2 projections that have quick keywords set up in apltran; Ordnance Survey National Grid (OSTN02) and WGS84 Universal Transverse Mercator (UTM). To reproject {{{flightline1.igm}}} into UTM Zone 31 we could do the following:
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     19{{{
     20apltran -inproj latlong WGS84 -igm my_output/flightline1.igm -output my_output/flightline1_utm31.igm -outproj utm_wgs84N 31
     21}}}
     22