Re: Could basemap plot in a UTM projection? - pyproj documentation

On 02/04/12 23:23, Jeff Whitaker wrote:

On 4/2/12 4:02 PM, Mathew Topper wrote:

On 02/04/12 19:09, Jeff Whitaker wrote:

Mat:  I just updated git master to add the 'k_0' keyword when using projection='tmerc'.  This is the scaling factor along the central meridian, and is needed to exactly match the UTM definition.  I also added a utmtest.py example, that shows how to plot a UTM zone, and convert Basemap coordinates to UTM coordinates.

-Jeff

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Jeff, thanks again for all your help with this. I tried the example and it works great. My only question would be how to get the axis labels into meters rather than degrees. Any hints? I have found the customticks.py example. Is that the best route to take?

Mat:  Just use 'suppress_ticks=False' when creating the Basemap instance, and you will get axis ticks in meters. If you want to use a custom tick formatter, use the customticks.py example as a guide.

-Jeff

Jeff, I wonder whether I could run this past you? Basically, I believe the easting and northing grid lines are available just by turning on the standard matplotlib grid, so therefore I'm assuming that the easting and northing grid will be orthogonal throughout the map - is that correct?

Assuming all is well with that then I need to add the correct offset to the axes values, presumably by calculating the value, in meters, of the origin. I'm guessing I will have to use a tick formatter (like customticks.py) to do this or the map points will no longer be on the map (if, for instance, I just changed the axes ranges).

Does that make sense to you?

Thanks

Mat


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