+11Hello everyone,
I have a little problem with the densitycalculator transformer.
Here are the details :
- I want to have the density of a road network into a 1000m*1000m grid
- I've followed the documentation of the densitycalculator transformer and I don't have any results (all the densities are set to 0 in my results)
- I also made a "group by" into the densitycalculator to have the count of road density for each cell of my grid...
Do you have any ideas to help me ?
Thanks ! :)
Best answer by markatsafe
@theodrogo Make sure that the areas and candidates are in the same coordinate system. You will need the Clipper that is disabled in the image you sent so that your _count attribute is on both features - that you use in the Group By.
I've attached an example workspace (2019.2): densitycalculator.fmwt
@theodrogo Make sure that the areas and candidates are in the same coordinate system. You will need the Clipper that is disabled in the image you sent so that your _count attribute is on both features - that you use in the Group By.
I've attached an example workspace (2019.2): densitycalculator.fmwt
+11Thank you !
My datasets were however in the same coordinate systems, and it still didn't work. I think the problem was the group by (because I didn't merge attributes with the clipper ..).
Finally, I used an alternative method by calculating my road lengths in each cell of approximatively 1km2, then I created a list with the lengths accumulated in each of the cells of the grid, in order to obtain a list of sum, which then allowed me to get my density (by dividing by the total area of each cell) ... In short, I think I did the same work as the transformer "densitycalculator" ... but decomposed way!
Anyway, thank you very much for your answer!
Theo
