[Gdal-dev] Tool to convert shapefile from [-180, 180] to [0, 360] range

[Mateusz Loskot]

Daniel Morissette wrote:
> Is anyone aware of a tool or script that would convert the longitude 
> of coordinates in a shapefile from [-180,180] to [0,360]? The tool 
> could be based on OGR or any other open source package.
> 
> Just checking before writing something from scratch and reinventing 
> the wheel.


Hi Daniel,

I created small utility on basis of ogr2ogr according your needs, just
for fun and practice :-)
I attached it as a 180to360.cpp file, so it's a C++ application.
I hope this attachement will not be cutted off by the gdal-dev mailer.
It works only with shapefiles.

This utility just adds 180 to every x coordinate.
So, it works well only if input coordinates are in range frm -180 to
180, but it does not check it.
You have to compile it as ogr2ogr.cpp, here is small Makefile:

# Change FLAGS if needed
CPP = g++
LDFLAGS = -L/usr/lib -lgdal
CPPFLAGS = -I/usr/include $(CPPFLAGS)

180to360: 180to360.cpp
	$(CPP) $(CPPFLAGS) $< -o $@ $(LDFLAGS)


Run it without any options and you will see the usage message.
In example:

./180to360 ~/tmp/sec.shp ~/tmp/test.shp

and test.shp includes features dumped from sec.shp with X coord conversion.

If there is something not working, just give me a note.

Cheers
-- 
Mateusz Loskot
http://mateusz.loskot.net
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