[Qgis-user] Question regarding point to grid analysis

[Carlos Cerdán]

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 <mcoletti at gmail.com>:

> 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
> --
> mcoletti at gmail.com
>
>
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