> Shu: I'd make a mask by finding the points on the grid that are outside > your polygon. Then use that mask to create a masked array from your > data (masking the points you don't want to plot). matplotlib's contourf > knows how to deal with masked arrays (at least when the masked region > isn't too complicated). The basemap toolkit can plot data on map > projections with coastlines and political boundaries (as in the PyNGL > example you forwarded). > > -Jeff
Thanks Jeff.Following your advice I have successed to get a masked contour plot.Matplotlib can do it good. in my case, x is array for axis X and y for axis Y z is data for contour mask is a mask array with the same dimensions as z. ma.array(z,mask=mask) contour(x,y,z) In my case,I used kriging interpolation to interpolate an array of irregulation station data into a rectangular grid first and then plot contour with matplotlib. I wanna know if matplotlib have such interpolation functions or geostatistics functions. Thanks again. shu ------------------------------------------------------------------------- Take Surveys. Earn Cash. Influence the Future of IT Join SourceForge.net's Techsay panel and you'll get the chance to share your opinions on IT & business topics through brief surveys - and earn cash http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV _______________________________________________ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users
