Hi Vincent, Just to make sure I understand you, what you have is a curvilinear dataset like this? yes? show datand you want to do something with your data variable on a subset of the region. This is not a trivial problem. If you want to just make a plot of a subset of the data of course you can use /VLMITS and /HLIMITS (possibly also /MODULO on a curvilinear plot command), and see use a part of the data. But this is inefficient as you still load all the data into memory, and for larger datasets this is a real drawback. It also doesn't let you do more general things on a subset of the data. For another more general discussion of why this is hard, and a way of handling the problem, see this FAQ, "How can I determine the indices that represent longitude and latitude limits for reading a subset of data on a curvilinear grid?" http://ferret.pmel.noaa.gov/FERRET_17sep07/FAQ/custom_plots/subsetting_curvi_data.html Ansley VINCENT_LEFOUEST@xxxxxxxxxx wrote:
|