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Using QGIS on Windows XP based desktop. I am trying to use USDA orthophoto data from this WMS server: "http://raster.nationalmap.gov/arcgis/services/Orthoimagery/USGS_EDC_Ortho_NAIP/ImageServer/WMSServer"

I can get the layer into QGIS with no problem but the only layer on the WMS server is of the entire United States. I want to extract from that the area I am interested in (a city). I have a vector layer of that city to use as a clip coverage but GDAL can only clip from a local raster layer. I have probably left out some pertinent information so please just ask if you need more information.

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I thinks he is talking about clipping a raster that is streamed from a WMS. Sextante tools will only clip local rasters. –  Kapanther Dec 14 '12 at 0:48

2 Answers 2

Using the geoprocessing library Sextante you can clip a raster with a vector layer. The name of the algorithm you should use is: Crop Grid With Polygon Layer.

As i think that Sextante for qgis is still under developement maybe it don't have jet this algorithm so you can any of the latest build of gvSIG (i suggest you to use gvSIG 1.12 build 1412).

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You can't clip, edit or save streamed layers from WMS-Servers. What you need is a WFS-Connection to your Orthophotos, where you can temporarily cache data.

The other alternative would be (if you have only one area of interest) that you make a screenshot from QGIS and save your WMS-Ortho Map as png. After that you just have to digitalize your screenshot (search for tutorials on this site and the net).

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