OK - have imported the OSGB36 GEOGCS using the line from the ecw_cs.wkt
file (with first field removed! Oops)
Now I need to transform from OSGB36 to WGS84. I have set up the
OGRSpatialReference of the input using importFromWkt and the output
using setWellKnownGeogCS("WGS84"). The OGR Transform appears to be
working but the numbers returned are evidently Northings/Eastings
comparable to the numbers in the tfw file.
How can I insist that they come back as Lat/Long?
Gary
________________________________
From: [email protected]
[mailto:[email protected]] On Behalf Of Smart, Gary
Sent: 27 January 2010 11:21
To: [email protected]
Subject: [gdal-dev] Projection for OSGB36
I have a series of OS map TIF files with associated tfw files. However,
the tif files contain no information about the projection. I understand
that these files are using OSGB36 AIRY1830
Can anyone tell me the precise text specification I need to be able to
set up this projection.
An example tfw file is:
2.5
0
0
-2.5
215000
254000
I tried to importFromWkt with the string from the gdal/data/ecw_cs.wkt
but this did not seem to work. I don't believe that OSGB36
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