Thanks Jeff, that's actually what I wanted to know.
Unfortunately I guess, there is a small difference between Transverse
Mercator and Universal Transverse Mercator Projections
Do I have the possibility to define somewere the UTM zone and the Datum
of my Projection.
I tried it like Jeff suggested,
map1 = Basemap(projection='tmerc',
resolution='i',llcrnrlon=-128.3841365,llcrnrlat=68.3952899,urcrnrlon=-121.5846218,urcrnrlat=70.7793990,
lon_0=-124.98437915,lat_0=69.587344449999989)
lons,lats = map1(X_utm,Y_utm,inverse='True')
but the lons and lats
look like this:
In [53]: lons
Out[53]:
array([[-124.98437915, -124.98437915, -124.98437915, ..., -124.98437915,
-124.98437915, -124.98437915],
[-124.98437915, -124.98437915, -124.98437915, ..., -124.98437915,
-124.98437915, -124.98437915],
[-124.98437915, -124.98437915, -124.98437915, ..., -124.98437915,
-124.98437915, -124.98437915],
...,
[-124.98437915, -124.98437915, -124.98437915, ..., -124.98437915,
-124.98437915, -124.98437915],
[-124.98437915, -124.98437915, -124.98437915, ..., -124.98437915,
-124.98437915, -124.98437915],
[-124.98437915, -124.98437915, -124.98437915, ..., -124.98437915,
-124.98437915, -124.98437915]])
In [54]: lats
Out[54]:
array([[ 90., 90., 90., ..., 90., 90., 90.],
[ 90., 90., 90., ..., 90., 90., 90.],
[ 90., 90., 90., ..., 90., 90., 90.],
...,
[ 90., 90., 90., ..., 90., 90., 90.],
[ 90., 90., 90., ..., 90., 90., 90.],
[ 90., 90., 90., ..., 90., 90., 90.]])
Has anyone an idea?
--
Anja Roesel
Center for Marine and Atmospheric Research
Institute of Oceanography, University of Hamburg
Bundesstrasse 53
D-20146 Hamburg
Germany
Tel. +49 40 42838 5430 Fax: +49 40 42838 7471
>
> Anja: You need to pass the latitude and longitude values (in degrees)
> to the Basemap instance when converting to projection coordinates. So,
> to convert from UTM coordinates to polar stereographic coordinates you
> will need to do something like this:
>
> map1 = Basemap(<parameters for transverse mercator projection>)
>
> lons, lats = map1(x, y, inverse=True) # x and y are projection
> coordinates on original UTM grid.
>
> # lons and lats are now latitudes and longitudes of UTM grid (in degrees)
>
> map2 =
>
> Basemap(resolution='i',projection='npstere',lon_0=-45,boundinglat=70)
>
> x, y = map2(lons, lats)
>
> # x,y are now polar stereo coordinates of UTM grid.
>
> Or, if you already have the latitudes and logintudes of the original UTM
> grid you can skip the first two lines and just pass those to the
> stereographic Basemap instance.
>
> -Jeff
>
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