Changes between Version 1 and Version 2 of Processing/aplquickstart

Timestamp:

Feb 8, 2012, 2:33:36 PM (13 years ago)

Author:

mark1

Comment:

--

Processing/aplquickstart

@@ -15 +15 @@
 == Reprojection from Geographic Latitude / Longitude ==
 
-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:
+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 data, using a filename {{{flightline1_utm31.igm}}} we could do the following:
 
 {{{
@@ -21 +23 @@
 }}}
 
+If we wish to reproject the data into Ordnance Survey National Grid then we must first download the gridshift file from here:
+
+http://www.ordnancesurvey.co.uk/oswebsite/gps/docs/OSTN02_NTv2_DataFiles.zip
+
+and unzip the files into a directory, say, named ostn02. The file we need has the .gsb extension.
+
+The command to reproject the data into Ordnance Survey National Grid projection is then:
+
+{{{
+apltran -inproj latlong WGS84 -igm my_output/flightline1.igm -output my_output/flightline1_osng.igm -outproj osng ostn02/OSTN02_NTv2.gsb
+}}}