Questions tagged [adjacency]
Spatial relationship where two features share a common border under some interpretation - ie, are 'next to' each other.
57
questions
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21 views
Querying Adjacent Polygon Features using ArcMap
I have a layer of polygon features representing forest stands with a vegetation type and age. For every forest stand I want to assign it a value in an empty field if any of the adjacent stands have a ...
0
votes
1answer
78 views
ArcGIS Pro matching and dissolving neighbours
I have a FeatureClass derived from ArcGIS Desktop 10.6.1's Polygon Neighbors tool [Windows 10 - 64]. I have supplied a tiny sample (of >250k) that gives the flavour and an example of the objective.
...
1
vote
1answer
49 views
Extracting lines from polygons/buildings based on adjacency to lines/streets
I have a building and street shapefile of a district. I am looking for a way to select and eventually extract those lines or edges of the buildings that face the street.
however the extracted edges ...
0
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0answers
32 views
Problems with adjacency matrix with poly2nb in R
I am working with a shapefile of Ohio precincts, with the hope of performing areal regression models (probably BYM2). To build the adjacency matrix, I used poly2nb from the spdep package. As a double-...
0
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1answer
36 views
How to increase the number of the adjacent cells of a focal cell?
I want to recover the adjacent cells around a focal cell, I could do it by using the function adjacent form the package « raster »,
cells_adj <- adjacent(Habitat[[1]], cells=cells_xy, directions=...
6
votes
2answers
126 views
Why do clipped polygon features (clipped with adjacent polygon tiles) still overlap with each other?
I have two layers in QGIS with intersecting polygons (blue "P1" and green "P2"). I want to clip them with adjacent polygons tiles (dotted line - blue "cut1" and green &...
0
votes
1answer
44 views
Polygon Neighbors tool produces incorrect results
BACKGROUND:
At 10.8.1, I have used the Polygon Neighbors tool with a countywide parcel shapefile (approximately 47,000 polygons). The tool runs to completion (taking < 1 minute) without reporting ...
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0answers
34 views
How to dissolve polygons with common boundary (adjacent) in an Oracle layer through Oracle SQL select command?
I already have an Oracle layer with polygons which I want to dissolve it through a SELECT SQL command and not use any GIS software, just the Oracle SDO commands.
I can do it normally through GIS tools ...
0
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2answers
82 views
Identifying shared polygon boundaries in ArcGIS Desktop
I am aware you can dissolve boundaries (standard feature analysis tool) but is there a way you can calculate polygons that share a boundary?
I have attached picture with an example of the polygon data ...
4
votes
3answers
191 views
Simplifying adjacent polygons on subset of vertices only
We have many adjacent polygons which are very complex and we need to simplify only some portions of them.
There are no gaps nor overlaps between any two adjacent polygons.
What we'd like to do is to ...
2
votes
1answer
110 views
how to remove small water bodies in binary mask array that we get from ndwi values?
I've detected water bodies in satellite images (modis, sentinel, landsat) in special area polygons, by ndwi values and based on special thresholds. area polygons and image tiles are coordinate ...
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vote
2answers
150 views
Checking if selected features are adjacent using OpenLayers [closed]
I need to be able to merge features on the condition that the selected features are adjacent to each other.
How can I achieve this using Open Layers version 5?
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0answers
31 views
Adding attributes from surrounding feature (exclave problem)?
Here is the problem:
I am creating polygons based on the result of closest facility tool in Arcmap. Polygons consist of municipalities with the same closest hospital (impedance is a travel time, not ...
0
votes
1answer
128 views
Finding neighbouring countries using Overpass?
How can I find all countries that are neighbours (share a border point or line) of a given country (eg. germany) using Overpass?
0
votes
1answer
31 views
Computing area of shared surface between adjacent 3D features in ArcGIS Pro?
ArcGIS Pro currently provides the Polygon Neighbors tool to compute the length of the shared border between features.
I want to do the same type of calculation for (closed) 3D features, i.e. I want to ...
1
vote
0answers
94 views
Converting polygon to line with neighbor info using QGIS?
Is it possible to create lines from polygons with information about neighbors in QGIS?
I would like to do this for land plots. There is a tool in ArcMap that works like a charm, but I do not see ...
2
votes
0answers
67 views
Convert bitmap image to adjacency [closed]
I have a map in a bitmap image format (.bmp) where each region is assigned an RGB colour. What I want is a list of every adjacent region, for every region.
So if region1 is adjacent to region2 and ...
3
votes
0answers
74 views
Grouping polygon neighbors recursively using PyQGIS? [closed]
I have a shapefile with polygons and need to group them with the same Group_ID if they touch each others. The thing is, once I start assigning a number to one polygon, it needs to keep looking for ...
2
votes
1answer
124 views
Ordering polygon neighbors in clockwise order using ArcMap?
In ArcMap, I am using the Polygon Neighbors tool to generate a list of each polygon's adjacent polygons, or 'neighbors.' Currently, ArcMap orders the polygons using each polygon's numeric ID. What I ...
1
vote
2answers
228 views
Merging polygons that share one vertex (node neighbors) using ArcGIS Desktop?
I have a set of very large shapefiles and would like to merge polygons within these that share one vertex.
Currently they are all separate like so:
What tool can I use to merge all the polygons ...
3
votes
1answer
685 views
Dissolve (merge) polygons QGIS based on attribute values only when are adjacent
I am a fairly new user of QGIS having a question regarding dissolve functionality.
I am working with the NUTS-2 shapefiles provided by EU, which I have imported in QGIS. I have created a new layer ...
1
vote
1answer
360 views
Using Polygon Neighbors for boundary polygons to find boundary lengths in ArcMap?
I am working in ArcMap. I have a map of districts in South Carolina, and I'm trying to find the boundary length that every district has with every other district, and the boundary of South Carolina ...
0
votes
1answer
61 views
Second-level neighbors of large polygon (neighbors' neighbors)
I have a large-ish set of polygons and am after identifying second-level neighbors of each, that is, the neighbors of the neighbors of each polygon (distinctly, i.e. the 2nd-level neighbors cannot ...
1
vote
1answer
165 views
Extract the “mid/center-point” of the touching borders/lines of adjacent polygons
I have a layer with several polygons and want to extract the "mid/center-point" of the touching borders/lines of adjacent polygons. Despite trying several methods, I do not know how to achieve what I ...
7
votes
6answers
1k views
Determining if polygon not enclosed by other polygons [closed]
Does anyone know of a routine/function or transformer that would identify if a polygon is not fully enclosed/surrounded by other polygons?
The polygons have no gaps or slivers between them so if a ...
0
votes
1answer
185 views
Identifying/exporting adjacent polygons in ArcGIS Desktop?
I have many polygons (US Counties) with agricultural land data in them. I would like to identify and export (ideally into excel) the data from the counties that are adjacent to the ones with ...
0
votes
1answer
59 views
Selecting coastal census tracts in ArcMap? [closed]
What tool should I use to select or identify geographic units that are adjacent to the U.S. coastline feature in ArcMap?
3
votes
0answers
365 views
Creating Adjacency Matrix using SpatialLinesDataFrame and SpatialPointsDataFrame in R?
I am trying to create an adjacency matrix of power plants that are connected via power lines. The plant data is point data (~8000 observations) with longitude and latitude measurements. The line data ...
1
vote
0answers
149 views
Directions based on polygon centroid and average/median point of adjacent polygon's touching border
I have a layer containing multiple polygons, and I am trying to find a way to identify the directions of the adjacent polygons of a certain polygon. The directions would be based on the main polygon ...
2
votes
0answers
227 views
Postgis List of adjacent LineStrings ordered sequentially from one end of the MultiLineString to the other
I have LineStrings that represent a road network/address centerline that are segmented at intersections, etc. I have determined how to query collections of LineStrings that are adjacent to each other ...
0
votes
0answers
85 views
Calculate Adjacent Fields Issues
I am trying to run the Calculate Adjacent Fields ToolBox on one of my Shapefiles, but the process is taking hours to run, and I have yet to complete the process. My table is 18,000 rows, and so far ...
2
votes
1answer
3k views
Merging adjacent polygons in QGIS
I have a set of polygon layers with thousands of polygons some of which are adjacent (Either rings or simply adjacent). I would like to simplify this polygons by merging them.
Is there a way to do ...
1
vote
1answer
157 views
Adjacency Matrix Not Including Vertices
I have a SpatialPolygonsDataFrame and I would like to create an adjacency matrix. However, I would like to only count two polygons as adjacent if they share more than just vertices (i.e. they share an ...
2
votes
3answers
1k views
Counting polygon neighbours and writing to table using PyQGIS? [closed]
I have a shapefile with municipality polygons. I would like to count the number of neighbours for each polygon and write it to the attribute table. I have no succeeded yet in doing this, even though I ...
12
votes
3answers
3k views
Conditional assignment of values to adjacent raster cells?
I have a value raster:
m <- matrix(c(2,4,5,5,2,8,7,3,1,6,
5,7,5,7,1,6,7,2,6,3,
4,7,3,4,5,3,7,9,3,8,
9,3,6,8,3,4,7,3,7,8,
3,3,7,7,5,3,2,8,9,8,
7,6,2,6,5,...
4
votes
1answer
185 views
ArcGIS, detect adjacent polygons with different values
I am developing an ArcMap extension and I need to validate a particular case. I need to detect adjacents polygons that have one value equal, and the others not equal. I you take a look at the image, ...
1
vote
2answers
393 views
Identifying isolated polygons within other polygons ArcGIS for Desktop?
I am using ArcGIS 10.4 for Desktop.
I have a single feature class with one attribute with 5 levels describing the state of grasslands and how they have changed over time. The attached image shows a ...
4
votes
1answer
112 views
Style rule based on feature adjacency?
Is there a way in QGIS to use an expression to define a polygon feature's color based on whether it's adjacent to other features? I would like to achieve something like the following:
-If a feature ...
1
vote
1answer
43 views
Identifying ID of adjacent pipelines?
I work with ArcGIS. In the picture you can see several pipelines, more over pipeID's A; 1; 2; 3
I would like to have as an output the following columns and rows:
A - 1;
A - 2;
A - 3;
As an ...
0
votes
1answer
399 views
Merge adjacent polygons [closed]
I want to write software that merges groups of (mainly) adjacent polygons. For example, merge the US counties into sales regions. Then, display either the boundary of these sales regions or fill them ...
1
vote
0answers
44 views
Merge without dissolve in ArcGIS for Desktop? [duplicate]
I am trying to merge several polygons in a feature dataset into one. Normally I would use a simple merge but the issue is that merge automatically dissolves. I on the other hand want to have them all ...
2
votes
1answer
174 views
Adjacency matrix from TopoJSON
I have a TopoJSON file which describes electoral districts in Montreal, and I would like to produce an adjacency matrix which would tell me which districts share a boundary with which other districts. ...
1
vote
1answer
927 views
Creating lines that connect the centroids of adjacent polygons to one another
I have about 10 polygons, and I have added their centroids to the map. I want to create lines connecting the centroids of each adjacent polygon. If polygon 1 borders polygon 2 and 3, I would like a ...
0
votes
1answer
763 views
Merge touching polygons with keeping their attributes
I've got a layer of polygons
Although they all in the same layer, each polygon own some unique data like the date of this polygon and an amount it possess (a number).
I want to join/merge all the ...
2
votes
1answer
585 views
Adjacency matrix from polygons in GeoJSON
I have a set of polygon features in a GeoJSON file. They are neigbourhoods in Chicago. I would like to produce an adjacency matrix A, in CSV format or any other form, where the i,j element of A is 1 ...
3
votes
0answers
187 views
Adjacency matrix for polygons using Java
I am trying to create an adjacency matrix from a set of polygons. That is, I have a bunch of polygons and I want to identify which polygons have a common edge or "touch" each other. Once I find this ...
1
vote
1answer
60 views
Outputting Polygon Neighbors into special format using ArcPy?
I need Polygon Neighbors to give me data in a specific format. Every polygon should have its own line in the output. Take this, for example(it's obviously not ArcGIS formatted, but it serves the ...
2
votes
0answers
62 views
Specifying polygon face toward two different lines using ArcMap?
I have a parcel layer, a street of city layer, and I want to find the parcels at the corner of two different streets (meaning a house with two faces toward 2 streets).
I am using ArcMap.
I want ...
0
votes
1answer
99 views
Selecting/creating polygons of interest based on existing polygon database and indicate other polygons that share boundaries in ArcGIS for Desktop?
I am using ArcGIS 10.2 for Desktop.
The existing polygon database contains attribute table with the following structure, and has three levels; country, state, and city. I am interested in the state ...
1
vote
2answers
255 views
Adding/updating field to polygon feature class that lists bordering (neighbor) polygons?
I have a dataset of zipcodes.
I want to add a new field "NEIGHBORS" that includes bordering polygons in a comma delimited manner such as attached image:
