Questions tagged [grids-sum]

Grids Sum is a cellwise addition of grid values.

Filter by
Sorted by
Tagged with
1
vote
0answers
32 views

PostGIS: Get portion of length in polygon. Aggregate value by this portion

I have a table that has two points (made into a line) and a value per row. I have another table that is a grid that has a geometry and id per row. I'd like to aggregate the data in such a way that ...
1
vote
1answer
89 views

Average of polygons within mask polygon

I have two shapefiles. One consists of squared grid cells and contains ... let's say precipitation data. The other one was downloaded from NaturalEarthData and contains country-internal administrative ...
5
votes
1answer
225 views

Convert polygon to grid lines

I have a QGIS project with several shapefiles like the one in following image. I want to know how many times the shapefiles overlap and where is produced a gradient. I think the best option is to ...
2
votes
1answer
326 views

Summing multiple rasters using ArcGIS Desktop?

This is a question related to an earlier one of mine (Reclassifying multiple rasters in ArcGIS Desktop?). I want to sum up 162 rasters: I tried to load them all into ArcMAP in order to eventually use ...
0
votes
1answer
108 views

Is Output Cell Size Environment the same as Resample tool?

I have a raster catalog that contains hundreds of rasters (10 x 10). I need to perform Cell Statistics SUM on all the raster. End user able to specify under what cell size the want to perform the ...
4
votes
1answer
1k views

Summing pixel values from several raster layers with partial overlap in QGIS?

I have several presence maps (rasters values 1 and 0) from different species. They are all from South America, but they do not have the same extend (i.e., different sizes). So, I am trying to ...
2
votes
1answer
460 views

Is there a way to create a presence/absence matrix of polygons per cell in a grid using qGIS?

I'm working in QGIS with species distribution polygons and I want to know how many cells in a grid does the polygon overlap. I've tried creating random points within the polygon and then used vector&...
3
votes
0answers
162 views

Raster calculators in SAGA return incorrect results

Here's a sample of my dataset (one cell) with 28 different raster values, representing 28 individual Float32 rasters with identical parameters. 0.0000264434, 0.0049953502, 0.0007529828, 0....