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Questions tagged [symmetricdifference]

this analysis process creates a new layer with the features of either one of the original layers, but the new layer does not include the areas where both of the layers existed. The symmetrical difference operation performs the opposite task of the intersect tool, and must use two polygon features in its analysis.

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What is the proper name for the “Venn diagram” of a set of geometries?

Sometimes, you have a set of overlapping geometries, and you want to generate an output like this: Image taken from this answer. The resulting polygons have no overlaps; each region of space is ...
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1answer
184 views

PostGIS Symmetrical Difference

Related question I have two tables in PostGIS, each with two features(rows) and a rectangular geometry (polygon). I would like to obtain the Symmetrical Difference from those two layers so that the ...
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1answer
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Area difference between polygon layers

I would like to calculate the difference of area between two polygons. I tried using the Difference tool, but all it does is create lines that are different between my two polygons. I also tried the ...
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1answer
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Splitting One Polygon By Boundary of Another using QGIS?

I'm using QGIS 3.0 and attempting to calculate the number of people that fall within a buffer. The population count is a field within my block group polygon layer. I've attached a screenshot, the ...
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1answer
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ArcPy ArcGIS Basic Standard: Get symmetric difference with partially contained, uneven numbers of polygons

I already looked up topics for rewriting the erase and symmetric difference functions, but I don't get it running. I got the following situation: FC1 and FC2 are my polygon input feature classes. ...
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2answers
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Removing lakes from a country polygon [duplicate]

I have two polygon layers: one indicating countries, and other on top indicating lakes. I want to create a new layer that keeps the countries but have the lakes cut out of them. What tool do I use?
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1answer
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Difference Tool (Polygon) Not Working

Okay so I'm using QGIS 2.10 (a couple of versions out of date, but shouldn't matter much, eh?) on Windows 7, and I can't figure out this supposedly a very basic geoprocessing tool DIFFERENCE. I'm ...
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1answer
183 views

PostGIS function ST_SymDifference between two segment groups produces unexpected results

I try to calculate the symmetric difference for a set of segment groups A and B with precision of 1E-5 (ST_SnapedToGrid(geom,1E-5). I've formulated the an ideal test case for a H based shape segment ...
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1answer
697 views

How to Automate Symmetric Difference using OGR in Python

I need to try and automate the process of creating mask layers by using the symmetric difference of two different polygon layer files (they are currently in .TAB format, however these can be converted ...
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2answers
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Removing intersect of one polygon from another using R?

I am trying to remove the intersect from Poly2 onto Poly1. Below are the coords of the 2 polygons. > coords1 [,1] [,2] [1,] 992.0161 7462.531 [2,] 950.1962 7413.532 [3,] 902.3632 ...