Hi Mark: I think that "point sampling tool" plugin is the tool what you need, With it, you take the corresponding raster value into the points attribute table, so in a new column you can calculate difference between point value and sampled value and make a statistic analysis of that difference.
Good luck Carlos Cerdán 2014-08-12 13:35 GMT-05:00 Mark Coletti <[email protected]>: > I have two sets of vaguely coincident point data that I'd like to compare. > Each point has a corresponding measure, and I'd like to assess the spatial > similarity between these two sets of measurements. My approach would be to > convert these values into grid data and then use techniques for comparing > the similarity of matrices. > > Since I'm new to using qgis in an analytical fashion I'm uncertain of the > best way of implementing this scheme. For one thing, there appear to be a > number of different means of converting point data into > grids/matrices/raster data -- e.g., heatmaps or grid interpolation-- and I > have the additional constraints of ensuring that the corresponding MBRs and > grid cell sizes are identical for fair comparison. > > What would be the best way to do this in qgis? (And, alas, I'm not > entirely sure by what I mean by "best". Easiest to do? Less error prone?) > > Cheers! > > Mark > -- > [email protected] > > > _______________________________________________ > Qgis-user mailing list > [email protected] > http://lists.osgeo.org/mailman/listinfo/qgis-user >
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