As an example, say I have a proj4 string defining a spatial reference system:
p4 = '+lon_0=0.0 +lat_ts=60.0 +R=6370997.0 +proj=stere +x_0=-0.0 +units=m
+y_0=4327039.11059 +lat_0=90.0'
Then one can construct a Basemap from this as:
map = Basemap(projection='stere', lon_0=0., lat_0=90, lat_ts=60,
llcrnrlat=50, urcrnrlat=70, llcrnrlon=0, urcrnrlon=20)
I could make a function to construct Basemap arguments from any user specified
proj4 string (which is out of control of my application). But that function
would probably be long and contain a lot of projection-specific
if-then-switches. Copying proj4 arguments directly does not work, e.g. if
passing "x_0=0" Basemap complains that x_0 is an unexpected argument.
The problem of making a long parser is not that this is tedious, but that it is
error prone and unstable e.g. with respect to future upgrades of Basemap or
proj4 libraries.
So as Basemap obviously does have an algorithm to create a proj4 string from
its input arguments, I was hoping the reverse algorithm would also be available
somehow. E.g. it would be very useful to be able to initialise a Basemap with:
map = Basemap(proj4=p4, llcrnrlat=50, urcrnrlat=70, llcrnrlon=0, urcrnrlon=20)
Knut-Frode
Date: Wed, 5 Nov 2014 09:32:16 -0800
I think some examples would help. Which proj4 string are you looking to use?
How are you currently constructing the map?-p
On Wed, Nov 5, 2014 at 7:53 AM, knutfrode <[email protected]> wrote:
Does anyone know if this is possible?
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