Hi Tyler, the point sampling tool plugin will allow you to select multiple rasters to sample from and output to the same file. It also allows you to save the results in a number of different formats (geopackage, csv and shapefile). If you've got access to python in your version of R then geopandas can read geopackage files directly, I find that a lot more useful than csv.
I use this workflow. The slowest part is the point sampling depending on the number and size of rasters and points. Matt On Tue, May 5, 2020 at 6:49 AM Tyler Smith <ty...@plantarum.ca> wrote: > Hi, > > I have 30 raster layers, and I need to sample 10,000 random points > from each layer (using the same set of points each time). I think > my options are: > > 1. Create a virtual raster, and sample. This has the downside that > the identify of the 30 layers will be replaced by generic 'band1', > 'band2' labels. > > 2. Sample the layers directly, using a batch process. This has the > downside that it appears to output to gpkg format, and creates 30 > separate files. I will need to open each of these files, export > the points they contain to csv, and then combine the into a single > table in R for analysis. > > Is there a way to create a virtual raster that retains the layer > names in the stack? Alternatively, can I bulk sample multiple > rasters and have the output combined in a single table? > > Thanks, > > Tyler > > -- > Tyler Smith > plantarum.ca > _______________________________________________ > Qgis-user mailing list > Qgis-user@lists.osgeo.org > List info: https://lists.osgeo.org/mailman/listinfo/qgis-user > Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-user
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