KURT PETERS wrote:
> I'm trying what I thought was a simple test and getting "bad" results. I am
> taking some lat long coords, and feeding it into a map. The conversion is
> not giving "real" values that can be plotted on a map (and actually produces
> an error when I use annotate).
> I'm including the simple code and the output:
>
>>>>>>>>>> CODE<<<<<<<<<<<<<<<
>>>>>>>>>>
> import pylab as p
> import numpy
> from matplotlib.toolkits.basemap import Basemap as Basemap
> from matplotlib.colors import rgb2hex
> from matplotlib.patches import Polygon
>
> # Lambert Conformal map of lower 48 states.
> # create new figure
> fig=p.figure()
> m1 = Basemap(llcrnrlon=-119,llcrnrlat=22,urcrnrlon=-64,urcrnrlat=49,\
>
> projection='ortho',lat_1=33,lat_2=45,lon_0=-95,lat_0=40,resolution='c')
>
>
> #COS
> #D + M/60 + S/3600
> COSLat=38+56.0/60.0+0.013
> COSLon=-1*(104+48.0/60.0)
> WASHLat=38+53.0/60.0+23.0/3600.0
> WASHLon=-1*(77+32.0/3600.0)
>
> print COSLat
> x, y = m1(COSLat,COSLon)
> print 'x =%f, y=%f' % (x,y)
>
> m1.plot([x],[y],'ko')
> ax=p.gca()
> ax.annotate('COS1',(COSLat,COSLon))
> #ax.annotate('COS2',(x,y))
> ax.annotate('Wash1',(WASHLat,WASHLon))
> x, y = m1(WASHLat,WASHLon)
> #ax.annotate('Wash2',(x,y))
>
> m1.drawcoastlines()
> m1.fillcontinents()
> m1.drawcountries()
> m1.drawstates()
> m1.drawparallels(numpy.arange(25,65,4),labels=[1,0,0,0])
> m1.drawmeridians(numpy.arange(-120,-40,4),labels=[0,0,0,1])
> p.title('full resolution')
> p.show()
> <<<<<<<<<Output>>>>>>>>>>>
> 38.9463333333
> x =1000000000000000000000000000000.000000,
> y=1000000000000000000000000000000.000000
>
> Regards,
> Kurt
>
>
Kurt: If you want the Lambert conformal projection, you should use
projection='lcc', not 'ortho'.
Nevertheless, your example works for me if I change the order of the
arguments passed to the Basemap instance to
x, y = m1(COSLon,COSLat)
x, y = m1(WASHLon,WASHLat)
Note, longitude goes first.
Also, if you want 'full resolution' coastlines, use resolution='h'.
-Jeff
--
Jeffrey S. Whitaker Phone : (303)497-6313
NOAA/OAR/CDC R/PSD1 FAX : (303)497-6449
325 Broadway Boulder, CO, USA 80305-3328
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