Questions tagged [overlapping-features]

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

Filter by
Sorted by
Tagged with
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 ...
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 ...
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 ...
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 ...
7
votes
6answers
28k 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 ...
10
votes
5answers
8k 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 (...
7
votes
3answers
6k 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 ...
4
votes
1answer
382 views

Counting traversed arcs on routes to write attributes using ArcGIS for Desktop?

I have number of persons located on a road network and I have calculated their shortest distance to a particular location. From the routes output created from Closest Facility can I break the routes ...
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 ...
7
votes
2answers
6k 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 ...
3
votes
1answer
9k views

Calculating percentage of overlap between two different layers

I have two different layers (Layer 1 and Layer 2) both made up of many thousands of polygons. Many of the polygons in Layer 1 overlap to differing degrees with Polygons in Layer 2. I need to calculate ...
11
votes
1answer
18k 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 ...
9
votes
2answers
12k 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 ...
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 ...
23
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 ...
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 ...
5
votes
1answer
2k views

Check whether table has overlapping polygons, in PostGIS?

Using PostGIS, what is an efficient way to check whether a table with a geometry column has geometries that overlap each other? This is my table: Column | Type | Modifiers -...
5
votes
1answer
1k views

PostGIS - when I add a polygon, delete overlapping areas in other layers

I'm starting to work with PostGIS and I'd like to solve the following problem: In my database, I have multiple land use class layers, for example: "residential", "industrial", "commercial". The ...
6
votes
1answer
267 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 ...
5
votes
1answer
555 views

Fitting known size polygons into irregular polygons using ArcGIS Desktop?

I have a task that sounds simple, but I just can't get through the last step. I need to find suitable areas where wind farms that have a size of 500x150 meters, could be placed. The restrictions are ...
6
votes
2answers
2k views

How to combine data from overlapping polygons?

Here's what I'm working with: Shapefile of the current 32 Congressional districts for all states Shapefile of the tract boundaries for Texas A DBF format table of Hispanic counts and proportions for ...
1
vote
2answers
553 views

Selecting isolated polygons which are not donuts but may overlap using ArcGIS Desktop?

I'm exploring a few different options for this process and I'm unsure what would be most effective. I'm trying to find all isolated, non-intercepting polygons in the same layer (not to merge). Most ...
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 ...
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 ...
5
votes
1answer
4k views

Count overlapping polygons in single shapefile with R

I have a shapefile of species ranges for ~ 346 species. Some species have multiple polygon ranges so there are 1,078 polygons and many polygons are multi-part. It looks something like this: I would ...
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'...
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 ...
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). ...
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 ...
2
votes
2answers
9k views

Find and list all polygons that overlap with another polygon

I am working with two polygon layers which overlap but are unrelated (one is congressional district boundaries, the other is MPO area boundaries). I would like to generate a list of all the ...
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 ...
3
votes
6answers
2k views

Counting overlapping polygons in GeoJSON to result in new set of polygons?

I have 100 polygons in a GeoJSON file that partially overlap each other. I would like to produce 100 new polygons as follows: The area covered by any of the original 100. This is their union. The ...
2
votes
1answer
152 views

Make convex hulls opaque or transparent

I have a series of convex hulls that I want to overlay but I want to be able to see all of them at the same time. How do I do this so? I'm guessing making them slightly transparent will do the trick
1
vote
1answer
197 views

Calculating percentage of overlap between 2 features from 2 different layers using ArcGIS Desktop?

I have two layers. Layer 1 has features that are property/parcels with area in acres. Layer 2 has features that are wetlands/bodies of water with area in acres. I want to calculate parcels that have ...
1
vote
2answers
317 views

Network Analyst resolved route can't display properly on printed map [duplicate]

I have looked on the Internet but there are no updated answers. I am using ArcMap 10.2. I am trying to print the route resolved by network analyst but there is no way I can display overlapped ...
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 ...
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.
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 ...
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/...
5
votes
2answers
698 views

Extracting Overlapping Parts of Single Polygon Layer using QGIS?

I have a single polygon layer with over 200 buffers with a lot of overlapping areas. I want to use QGIS to create a new layer representing the overlap. I've seen several questions that are similar, ...
5
votes
1answer
4k views

Select polygon features that intersect a line feature using pyqgis

How do I select all features in a polygon layer that intersect (overlap) a line feature? I need to implement this in python using QGIS, thus pyqgis. This code illustrates what I am looking for (line ...
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.
6
votes
1answer
2k views

ArcGIS Symbology Transparency

Using ArcGIS 10.1, I am interested in symbolizing a series of polylines to generate a pseudo-heatmap like one of the answers to this question. The essence of the solution idea is to symbolize each ...
4
votes
2answers
175 views

Display multiple identical polygons (with different attributes) on map

I need to create maps of multiple species in a certain area. However sometimes multiple species occurr in the exact same area. This results in two identical polygons on top of each other. Many of ...
2
votes
1answer
1k views

Assigning overlapping polygons based on attribute using ArcGIS for Desktop?

I am using ArcGIS 10.1 and have a polygon shapefile with 16000 records. There are many polygons that are overlapping and my goal is to determine the overlap portions fix the problem, so that there is ...
7
votes
2answers
842 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 ...
5
votes
1answer
156 views

Calculating area of intersecting polygons within severals overlapping buffers

I am working with.. an initial point layer (in blue) called : centroid_layer.shp an initial polygon layer (in green) of woods called : wood_zone.shp ..and I need to get the area of intersected ...
4
votes
2answers
661 views

Fastest way to numerate intersecting polygons in ArcGIS

I need to numerate a thousands of polygons in groups, so each group will get unique number. Every intersecting polygons is unique group (see picture). So polygons have field "groups" with values: ...
4
votes
2answers
5k views

How to fix overlapping polygons using ArcGIS for Desktop?

I'm using ArcMap 10.3. I have a layer of different land use types. After calculating the percentage of each land use in the catchment using tabulate intersection, I found out that the percentage of ...
3
votes
2answers
407 views

Add overlapping polygons

I have a feature class that contain many overlapping polygons. Each polygon has a field value which I would like to add together wherever the polygons overlap. There are about 100 polygons each with ...