Convert lat/lon to UTM

[Daniel de la Cuesta]

Hi,

How can I convert lat/lon to UTM format using geodjango?,

When I get a geometry I always have the coordinates in lat/lon format,
is there any way to get the polygon coordinates in UTM format or how
can I do the transformation?

Thank you.

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[Josh Livni]

Hi Daniel,

Assuming you have set the srid (probably 4326) on your geometry, then somegeometry.transform(26910) will transform / reproject it to utm zone 10 north.  Replace with the appropriate epsg code for your utm zone of choice.

Cheers,

 -Josh

[Justin Bronn]

On 4/18/10 11:40 AM, Josh Livni wrote:
> Assuming you have set the srid (probably 4326) on your geometry, then
> somegeometry.transform(26910) will transform / reproject it to utm zone
> 10 north. Replace with the appropriate epsg code for your utm zone of
> choice.

Yes, `geom.tranform(utm_srid)` is the way to go. Remember to set the
SRID when creating your geometries, and that the coordinate ordering is
(lon, lat) -- here's an example transforming a point for Houston, Texas
to it's UTM zone:

>>> from django.contrib.gis.geos import Point
>>> lon, lat = -95.363151, 29.763374
>>> pnt = Point(lon, lat, srid=4326)
>>> pnt.transform(32615) # http://spatialreference.org/ref/epsg/32615/
>>> print pnt
POINT (271507.6854771426296793 3294905.7410673047415912)

-Justin