Changes between Version 1 and Version 2 of Processing/aplquickstart


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Timestamp:
Feb 8, 2012 2:33:36 PM (8 years ago)
Author:
mark1
Comment:

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  • Processing/aplquickstart

    v1 v2  
    1515== Reprojection from Geographic Latitude / Longitude ==
    1616
    17 Reprojection 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:
     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).
     18
     19To reproject {{{flightline1.igm}}} into UTM Zone 31 data, using a filename {{{flightline1_utm31.igm}}} we could do the following:
    1820
    1921{{{
     
    2123}}}
    2224
     25If we wish to reproject the data into Ordnance Survey National Grid then we must first download the gridshift file from here:
     26
     27http://www.ordnancesurvey.co.uk/oswebsite/gps/docs/OSTN02_NTv2_DataFiles.zip
     28
     29and unzip the files into a directory, say, named ostn02. The file we need has the .gsb extension.
     30
     31The command to reproject the data into Ordnance Survey National Grid projection is then:
     32
     33{{{
     34apltran -inproj latlong WGS84 -igm my_output/flightline1.igm -output my_output/flightline1_osng.igm -outproj osng ostn02/OSTN02_NTv2.gsb
     35}}}