Le 14/09/2010 16:56, Donnet , Sebastien a écrit :
Hi,
I have a bunch of data in NAD27 (lat, lon ascii files) that I would like
to convert into NAD83.
How can I do that easily with gdal?
Up to now I've tried it like this:
gdaltransform -s_srs NAD27 -t_srs NAD83 < nad27.txt > nad83.txt
using a nad27.txt that looks like that (tab separated):
71.9881 -80.7771
71.9880 -80.7199
71.8889 -80.9131
71.8892 -80.9117
71.9041 -80.8410
Hello,
It is easier to use PROJ.4 :
cs2cs -r -s -f "%.4f" +proj=latlong +datum=NAD27 +to +proj=latlong
+datum=NAD83 < nad27.txt
71.9888 -80.7764 0.0001
71.9887 -80.7192 0.0001
71.8896 -80.9124 0.0001
71.8899 -80.9110 0.0001
71.9048 -80.8403 0.0001
Jean-Claude
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