On 4/2/12 10:03 AM, Mathew Topper wrote:
On 02/04/12 16:21, Jeff Whitaker wrote:
On 4/2/12 9:10 AM, Mathew Topper wrote:
Hi,
I've been trawling round the internet for a while trying to work out
if basemap could be made to plot using a UTM zone projection. I've
found some references to pyproj that could be used to convert out of
a UTM projection, but I haven't found any references to defining a
custom projection for basemap. Is it possible?
Also, there is not a lot of documentation regarding pyproj and I
find this a little odd considering it comes packaged with basemap.
Many Thanks,
Mat
Mat: Basemap can plot in the tranverse mercator projection
(projecton='tmerc') - UTM zones are transverse mercator with specific
lat/lon boundaries and a WGS84 ellipsoid. I suppose I could add UTM
zone support if there is enough demand for it.
-Jeff
--
Jeffrey S. Whitaker Phone : (303)497-6313
Meteorologist FAX : (303)497-6449
NOAA/OAR/PSD R/PSD1 Email :jeffrey.s.whita...@noaa.gov
325 Broadway Office : Skaggs Research Cntr 1D-113
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OK, thanks Jeff. So I just need to know the lon/lat bounds of the
desired UTM zone and I have effectively created a UTM projection of
that zone in basemap i.e. for UTM29 we have 12W to 6W.
Will basemap then except coordinates in meters defined by UTM29 or do
I have to convert to lon/lat first?
Mat: If you use projection='tmerc' and then give the lat/lon coords of
the upper right and lower left corners with
llcrnrlon,llcrnrlat,urcrnrlon,urcrnrlat, the projection coordinates will
be such that x,y = 0 in the lower left corner. Since those will not
match the UTM coordinates exactly, you will have to add an offset in x,y
to make them match.
-Jeff
I have a bit of an interesting case where the region we are examining
lies between UTM29 and UTM30, and I was interested in displaying how
the change in projection effects the topography.
Thanks
Mat
--
Dr. Mathew Topper
Institute for Energy Systems
School of Engineering
The University of Edinburgh
Faraday Building
The King's Buildings
Edinburgh EH9 3JL
Tel: +44 (0)131 650 5570
School fax: +44 (0)131 650 6554
mathew.top...@ed.ac.uk <mailto:mathew.top...@ed.ac.uk>
http://www.see.ed.ac.uk <http://www.see.ed.ac.uk/>
The University of Edinburgh is a charitable body, registered in
Scotland, with registration number SC005336.
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--
Jeffrey S. Whitaker Phone : (303)497-6313
Meteorologist FAX : (303)497-6449
NOAA/OAR/PSD R/PSD1 Email : jeffrey.s.whita...@noaa.gov
325 Broadway Office : Skaggs Research Cntr 1D-113
Boulder, CO, USA 80303-3328 Web : http://tinyurl.com/5telg
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