I am building a model to generate two zones around a point, a 250m-buffer, and a ring of 250 to 1000m, where i recalculate values from an other layer according to the intersections share.
The purpose is to examine if values in the 1. buffer are smaller than in the second. The rest of explanations would take too long and everything goes fine so far.
The final step would now be, to sum up the values for each layer, but somehow I can't find a solution.
There is the "Statistics by categories" function in the modeler which produces a stats-table i could join back to my layers and then dissolve them, but ... for whatever reason ... this only produces values for min, max, mean and stddev, but no sum of values!!
All dissolve functions available, do not offer any summing or whatever actions.
Anyone got any idea?
I'm stuck 1 meter in front of the finish line ...
P.s: there is NO option to do anything manually there. Simply too many points with too many other parameters to check each time. Thats why I made the model ...
UPDATE: Now I had the ideas to create centroids from all intersected polygons and then do a SAGA Points in Polygon statistic (which includes a SUM !!!!) with the un-intersected buffer a few steps before ... but this time the SAGA function is buggy and doesn't work.