Questions tagged [overlapping-features]

Features that share some or all of their spatial location with other features.

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27
votes
2answers
24k views

Trilateration algorithm for n amount of points

I need to find algorithm that can calculate centroid A (aka gravity center, geometric center, center of mass) from the figure where circles T1,T2,T3,T4,T5,..,Tn intersect AND length of line R from ...
25
votes
4answers
4k views

Making map where overlapping symbols increase Opacity?

I was looking at some maps like: Map from Ship Logs or the Facebook worldwide friendships Mapped (via the Flowing Data blog) These Maps look good because single lines are almost transparent, and as ...
24
votes
5answers
4k views

Rendering overlapping lines

I am making a map containing information about public transportation: busses, trams, etc. The map will have a layer containing for example the tram lines. Each line has its own colour, and is ...
21
votes
8answers
4k views

Fixing thousands of small overlapping polygons?

I'm using ArcMap 10.3. I have a layer of different land use types. I found out that many polygons overlap each other and as a result the same polygon have two different land use types. Using @...
17
votes
2answers
8k views

Counting and rasterizing polygon overlaps in ArcGIS Desktop?

How do you take a vector layer with overlapping polygons and turn it into a raster where each cell counts the number of polygons containing that cell? We are looking at polygons of fire burn areas ...
17
votes
3answers
1k views

How to improve cartographic visualization of overlapping polygons?

I need some advice about how to improve the visualization of cartographic information. User can select different species and the webmapping app shows its geographical distribution (polygonal degree ...
17
votes
1answer
9k views

Representing overlapping lines in ArcGIS Desktop? [duplicate]

I have lots of lines (in one feature class) which share the same location but I want to represent them as lines that are next to each other because they have different properties (different OWNERS). ...
15
votes
9answers
5k views

How to obtain overlapping semi-transparent circles effect in ArcGIS for Desktop?

I have been trying to obtain the following markers effect. How can I do the same in ArcGIS? This image is from a book.
15
votes
3answers
8k views

Cartographic techniques for symbolizing routing data [closed]

Some common problems with displaying routes created from street data, such as bus routes, include: Routes may overlap themselves, such as when a route takes the same road in opposite directions ...
15
votes
1answer
595 views

How to extract sublinestring from a linestring with overlapping segments

Problem statement: Given a bus route (defined as a linestring ln.the_geom), and a set of bus stop locations (pt1.the_geom,pt2.the_geom,...ptn.the_geom), divide the bus route into segments between bus ...
14
votes
1answer
4k views

Dealing with overlapping features in OpenLayers

If users create a polygon feature that completely overlaps another one, like this … … then there's no way you can select the inner feature, i.e. the one that's overlapped by the other. I'm currently ...
12
votes
1answer
19k views

Removing overlapping/duplicate polygons in same layer using QGIS?

I am working in QGIS on a vector layer where areas are classified using an attribute "typo". The problem I'm encountering is that many polygons are duplicated or overlapping, with the result that some ...
12
votes
2answers
1k views

Can labels for overlapping points be combined/merged into one label?

I have points representing sample locations. Often, multiple samples will be taken in the same location: multiple points with the same location but different sample IDs and other attributes. I'd like ...
12
votes
1answer
9k views

Determining if two polygons are overlapping in Google Maps?

I'm working with google maps and polygons, but I have to validate that polygons are not overlapping each other. I have a function that returns TRUE when a point (lat, lng) is inside a polygon, but it'...
12
votes
3answers
3k views

How to Display Overlapping Lines?

I have multiple line layers that represent bus routes and many of the routes overlap (i.e. near terminals, transfer locations, etc.) Is there a function in Qgis which will display both features next/...
12
votes
2answers
2k views

Point overplotting on maps in R (e.g. with ggplot2) - how to push points to the side, mark original positions, combine close-by points …?

I've got a database containing languages, their longitudes and latitudes and a feature value (either category 1, category 2 or both - in the plot these are marked red, blue and green respectively). ...
11
votes
3answers
11k views

Displaying transparent overlapping polygons in ArcGIS for Desktop?

I'm trying to draw home range maps in ArcGIS 10.1 and am having difficulty displaying them as I would like. The home ranges are in the form of polygons and many of them overlap. I'm trying to get a ...
11
votes
1answer
2k views

Is there a “Disperse Markers” tool for QGIS?

I am using ArcGIS, but either I would like to use QGIS and maybe want to switch completely later. A have a point overlapping problem, as a result of geocoding of addresses. I have not found any ...
10
votes
5answers
9k views

Counting overlapping polygons from one Shapefile using ArcGIS Desktop?

I have a shapefile with 16,400 polygons. Each polygon shows the expansion of a bird species for the whole world. Now I have to count the overlapping polygons. I tried it with union and dissolve (...
10
votes
3answers
15k views

Deleting overlapping polygon features from one of two layers using QGIS?

I have two overlapping layers of polygons, and I need to somehow erase the areas the overlaps. -This way i should end up with two layers of non overlapping polygons. Sounds pretty simple but I just ...
9
votes
3answers
5k views

Using ST_Difference to remove overlapping features?

I am trying to use ST_Difference to create a set of polygons (processing.trimmedparcelsnew) that do not contain any of the area covered by another set of polygons (test.single_geometry_1) using ...
9
votes
2answers
7k views

Creating heat map or density map from stacked polygons in ArcMap?

I have a polygon shape file that has many overlapping features. Each feature represents an area used by polar bears. So some of the polygons overlap and some don't, and there are separate clusters of ...
9
votes
4answers
4k views

Exploding overlapping to new non-overlapping polygons?

Given multiple polygons that overlap in multiple ways, I would like to export from these features all polygons that don't overlap with others, iteratively. The product would be a number of features ...
9
votes
2answers
13k views

Identifying overlapping polygons in single layer using QGIS?

I have a shapefile of buffered points in QGIS. I need to display all buffer polygons in this layer which overlap. I have experimented with the intersect tool, but this only seems to work if I am ...
9
votes
0answers
138 views

Iterating a model to create 3 buffers around three points and find their intersection (trilateration) in arcgis 10 [duplicate]

This past summer I recorded the location of a large number of plants I was working with by calculating the distance from each plant to each of 3 tripods for which I have GPS coordinates. I'm trying to ...
8
votes
2answers
7k views

Removing overlapping part of polygons using QGIS?

Here is what I'd like to achieve in QGIS. Is there a processing tool to remove the overlapping part of polygons? It is also very important that they do not get merged during the process and that ...
8
votes
2answers
3k views

Summing attribute values for areas where multiple polgons overlap using ArcGIS Desktop?

I have one shapefile with many polygons (at least 100). Each polygon has a value. Almost all these polygons overlap with each other. I want to sum the values of the polygons in the overlappings depend ...
8
votes
2answers
4k views

Merging overlapping features using Geopandas?

I have a Shapefile with overlapping features. Is there an easy way to merge them with geopandas? I found a way with shapely, but I would like to do it with geopandas directly.
8
votes
2answers
379 views

Enlarging polygons only on two sides using ArcGIS Desktop?

I want to enlarge a line of polygons only on the sides but I only found tools like "scale" or "buffer" which extend the whole polygon and not only widen them. The problem with scaling or buffering is ...
8
votes
1answer
1k views

Counting overlapping polygons in PostGIS using ST_Union very slow?

I have a set of 1000 polygons that overlap and I want to count the areas of overlap. I am using this blog post's instructions to create multilines from the 1000 polygons then use this line file to ...
7
votes
6answers
29k views

Representing several points with same coordinates on map using ArcGIS Desktop? [duplicate]

I'm working on Arcgis 10. I have a point shapefile representing events with several points having coinciding coordinates (They have the same coordinates). For representing them in a dynamic way, I ...
7
votes
3answers
7k views

Adding “noise” to overlapping X,Y coordinates so no longer in EXACT same place?

I have a series of points representing animal observations. Many of them overlap, having the exact same coordinates, and this is causing me trouble when I want to run some analytical tools which ...
7
votes
2answers
18k views

Find overlapping polylines in same layer in ArcMap?

How can I find overlapping polyline features in a layer in ArcMap without writing any code? I have a PolyLine feature class in a personal geodatabase. It contains some features that overlap another ...
7
votes
5answers
9k views

Merge overlapping lines in ArcGIS

I have a polyline shapefile containing a number of lines, some of which overlap. By overlap, I mean that they follow exactly the same path for some of their route, but also have bits that are not ...
7
votes
3answers
3k views

Alternative to ST_Union/ST_MemUnion for merging overlapping polygons using PostGIS?

New to PostGIS so I trust this is a very basic question but can't seem to find the right solution. I have a materialized view consisting of ~4 million polygons. Some of them overlap. I need to merge ...
7
votes
2answers
3k views

Clipping vs Intersecting

I was curious why clipping shapefiles was just so difficult and whether it was different to intersecting shapefiles? You will see from one my questions that I gave up trying to clip a polyline with a ...
7
votes
2answers
676 views

How to select behind feature which is overlapped with the same layer on QGIS 1.8.0

My issue: I received data which was created without "Avoid intersection of new polygon". There a few overlapped feature with the same layer. I could fine overlapped feature by the spatial query. But ...
7
votes
2answers
849 views

How to generate discrete areas from multiple, overlapping features?

I have a point dataset that I want to append some information from a polygon to. My polygon shapefile contains over 500 features. Whilst each of these features represents individual areas they are ...
7
votes
0answers
292 views

Point cluster symbology for different categories without overlapping symbols

I'm trying to visualize crimes based on if the crime happened during day or night time. I've tried using the point displacement tool but I'm not satisfied with the results because the readability for ...
6
votes
3answers
380 views

Styling overlapping polygons of different layers

I have 3 layers that sometimes have overlapping features. I need to use a thin outline style to interpret the area within the polygon and want to be able to see on the map when the features overlap. ...
6
votes
3answers
382 views

Using QGIS to remove portions of polygons that overlap in same layer?

Is there a way to easily eliminate the overlapping portions of polygons in the same layer? For example, I want to turn this into this I used Union to break the polygons apart where they ...
6
votes
1answer
712 views

Dissolve overlapping polygons according to percent overlap using PostGIS?

I have a shapefile with convex hull polygons, all in the same layer/shapefile. Some of the polygons overlap (not duplicate polygons). I would like to dissolve/union the polygons which overlap with ...
6
votes
1answer
1k views

How to split overlapping linestrings?

I'm new to PostGIS and a bit lost... I work with linestrings that sometimes overlap, for example: I'd like to distinguish these linestrings by splitting them like Google Maps do: I was thinking ...
6
votes
2answers
5k views

Finding crossing lines in ArcGIS Desktop?

I have a network of lines (pipes) and I want to be able to show the difference between an intersecting line and a crossing line. I was wondering if there is a tool for generating points on all ...
6
votes
1answer
11k views

can I extract overlap of polygons within the same layer?

I am trying to extract the overlap of polygons that are within the same layer in 10. The layer came from a buffered street centerline and I'm trying to extract and delete the intersections from the ...
6
votes
1answer
279 views

How to get smallest line segments from intersection + difference of multiple overlapping lines?

Inspired by this question, and this excellent answer. I have multiple overlapping lines and want to extract the complete intersection of them. So from this sample data SELECT id, geom INTO stackex ...
6
votes
1answer
2k views

Representing overlapping polylines in QGIS

I have several shapefiles representing bus lines with different colors for each segment, however, because the lines are exactly superposed, only the shapefile on top can be seen. Is there a way to ...
6
votes
1answer
3k views

How to clip a single layer of overlapping polygons in QGIS

I have a single layer of polygons. Some of the polygons overlap. I wish to make a new layer of just the parts of the polygons that overlap. What is the best way to do this in QGIS seeing it's all in ...
6
votes
1answer
3k views

How to merge overlapping and duplicate lines from vector layer to one single line?

I used the "polygon to line" tool from QGIS, to get a line-layer from this polygon-layer: Unfortunately this causes overlapping and duplicate lines, after I broke the qgis-export via GRASS into ...
6
votes
2answers
3k views

Zonal statistics for millions of overlapping polygons in ArcPy?

I am running ArcGIS 10.1 with 64-bit GP on Windows 8.1 x64. I want to calculate the zonal statistics of buffer polygons based on parcels and a kernel density raster. The 4.7 million polygons overlap ...