Questions tagged [intersection]

Use this tag when asking questions related to where features overlap.

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1answer
42 views

Unable to select layers for intersect in QGIS

I have a series of buffers around points that I want to intersect with FEMA's National Flood Hazard Layer. My goal is to find out which of the buffered points fall within 1% and 0.2% flood chance ...
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1answer
33 views

Finding overlapping polygons of two Spatial Polygon Data Frames using R

I am new to GIS and GIS in R. I have two Spatial Polygon Data Frames (spdf), one contains the marine ecoregions of the world (MEOW), the other one contains Exclusive Economic Zones (EEZ) of the world. ...
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0answers
19 views

Tabulate intersection, but I need it with null values too, not just with matching intersect

I have problem with tabulate intersection tool (In ArcGIS - ArcMap 10.7.1). The number of data is 1298 with 500 m buffer. Then i have polygons, that I need to process. I run the tool, but get the ...
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0answers
24 views

Calculate intersection of two 3D vector polygons

I have not found a solution yet to intersect two 3d vector layers. The solution is to calculate the intersection of the two polygonal 3d surfaces. Does anyone know a solution to intersect two vector ...
4
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2answers
95 views

Using the field calculator to calculate intersections

I'm comparing several maps of one area (made by different people) to each other, and used intersection to find how much of specific selected features (polygons) overlapped. I soon realised that the ...
1
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1answer
53 views

Two identical geography objects produce different STIntersects results in SQL Server 2019

Consider I have two POLYON geography object, @g1 and @g2. One from WKT and the other one converted from binary: DECLARE @g1 geography = 'POLYGON ((-45.70072144031528 70.79588950876575,-45....
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1answer
44 views

Negate the shapely intersection predicate

I have two Shapely geometries: 1 MultiPoint instance named multipoints 1 Polygon instance named polygon I can compute their intersection by: multipoints.intersection(polyon) which results in all ...
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0answers
16 views

How to insert the result of ST_Intersection into another column when the result has multiple geometry types [duplicate]

In PostGIS I have three tables table1, table2 and table3 of same type: CREATE TABLE tableX ( myid integer NOT NULL, wkb_geometry geometry(LineString,4326) ) table1 and table2 are populated. I ...
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1answer
22 views

ST_GEOMETRY points: get attribute of intersecting polygon

I have an SDE.ST_GEOEMTRY point feature class. I want to create an SQL query from the points. The query would perform a spatial join/intersection with an SDE.ST_GEOMETRY polygon feature class. An ...
2
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1answer
46 views

QGIS, Number of Lines through a Point (of over lapping multiline shapefile)

I am doing an irrigation system analysis, for that there are multiple overlapping lines are passing through multiple points. one number of line means a unit volume of the system, and point means a ...
4
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0answers
63 views

QGIS - Intersection query in a Geopackage

In QGIS 3.10.2, I wan't to calculate geometric intersections beetween two layers in a Geopackage like a view in PostgreSQL/PostGIS. The first layer is composed with features, a name attribute and a ...
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1answer
25 views

How to use GeoPandas buffer function to get buffer zones in kilometers?

I am having trouble with using GeoDataFrame.buffer function. That is probably because of my lack of understanding crs. Here is the case: I have events dataset (points longs & lats) and locations ...
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0answers
29 views

Generate node / vertex at starting point of line connections

I have line and point layer. I connected line layer with points using connect nodes to line in processing toolbox. After creating a connection line (green color), I used line intersection from ...
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1answer
31 views

Improving visualization of streets intersections in ArcGIS

I need to improve the street network intersections. The image describes what I want. These streets are all on the same level (elevation).
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1answer
41 views

How to draw radius buffer around the points and perform intersection with other locations list in GeoPandas Python? [duplicate]

I have two lists of points (latitudes, longitudes) - locations & events: locations = [[54.156014, 53.017209], [2.74284, 103.68141], [3.133688, 102.688424], [24.499918, 55.388891], [21.488382, 61....
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1answer
48 views

Making a for loop with st_intersections for multiple time-units in R

I have two sf & dataframe objects and I want to test intersections between their geometries based for different cycles of years. Basically I have a flood dataset that contains flood events and ...
3
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0answers
23 views

Calculating population within a circle excluding intersects with shapely

I have a data of a centroid and a count: centroid population id 0 POINT(38.9081 77.0349) 9004.0 0 1 POINT(38.8521,77.0377) 517.0 1 2 POINT(38.9081 77.0377) 10369.0 ...
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1answer
19 views

Create a table of points that intersect with polygons in ArcGIS Pro

I have a set of polygon and point data. Each polygon shares the same area with dozens of points. I want to create a table that shows which points intersect with which polygon. What is the best tool ...
3
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2answers
86 views

Choosing projection for running polygon intersections at global scale (i.e, geodesic intersections)?

How do I choose a projection for intersecting two global polygon datasets in WGS-84 (4326), and get accurate estimates of their overlap area? I searched the internet for answers to this question, and ...
0
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1answer
46 views

Finding duplicate shapely polygons (same polygons with different points) [closed]

I am interested in finding out duplicate shapely polygons having different points but covering the same area. For example, let assume I have 2 polygons: poly1 = POLYGON((4 1, 30 1, 45 1, 45 6, 12 6, 4 ...
3
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2answers
63 views

How to get the area of two interesecting polygons divided into attributes on PostGIS

I am trying to calculate the area overlap two vector polygon layers. I have the one based layer - soil map and I have second layer - plots. The example below: I would like to know how much area each ...
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0answers
38 views

QGIS 3.16 - unpractical changes to intersect tool? [closed]

I currently am testing QGIS 3.16. I just ran intersect without any input modifications on a buffer layer with 12 polygons (first input) and a layer with 417 administrative districts (second input). ...
4
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1answer
81 views

Use field calculator to check for intersection

Ultimate goal I plan to retrieve attributes from layers using the field calculator where they intersect with a geometry. Current step Checking whether the current $geometry intersects with the layer ...
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1answer
30 views

Merge polyline feature at vertex intersection based on segment count [duplicate]

I have a Polyline layer in QGIS which is split into multiple segments using the explode lines tool (the black lines in the image). There are nodes created from the 'extract vertices' tool (the red ...
0
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1answer
51 views

Test intersections with time indicators in R

I have a sf object with MULTIPOLYGONS that refers to flood episodes from 1800's onwards(https://data.gov.uk/dataset/16e32c53-35a6-4d54-a111-ca09031eaaaf/recorded-flood-outlines). Then I have another ...
7
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3answers
226 views

Finding intersections of features in one line layer using QGIS

I want to find intersections in the same layer like picture below. All lines are separate features in the same layer. How can I find these intersections in QGIS?
0
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1answer
37 views

Assign raster values based on polygon intersection

I have a raster where every cell is a 1. I also have a polygon of buffer areas that fall within the raster. I want to assign all raster cells that intersect the polygon geometrics to NA. But the two ...
1
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1answer
72 views

QGIS snapping issue

I'm facing the issue when I use the snapping tool at line layer in qgis. I turned on "snapping to segments" and then i've drawn that green lines (picture below) which touches other (purple) ...
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0answers
14 views

WFS request (INTERSECTS POINT) to Geoserver returns 2 features - 1 correct polygon and 1 near polygon

I am using a Geoserver with SHP layers, that works fine in my project.I am trying to migrate layers to MySQL db, works fine for WMS requests. But when I try to send a point coordinates to find if it ...
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1answer
22 views

Intersects filter in WFS

I try to use Intersects filter but I get an empty geometry in return. What did I miss in the syntax? https://data.gov.au/geoserver/brimbank-stormwater-pits/wfs?request=GetFeature&version=1.0.0&...
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1answer
23 views

Making the categories layer style which shows features overlapping another layer in a different color

I have tried with this new QGIS function from expression engine but it is not working. Here is the query I have tried: overlay_touches('Master_3307To3339',filter:= within(geometry(@parent),@map_extent)...
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0answers
16 views

Tabulate Intersect with Overlapping Polygons

I am trying to create a table that summarizes soil information for the given buffer areas of 125m and 500m radii. Both the soil data and buffer data are in vector form. Within each buffer, there can ...
0
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0answers
38 views

Overpass API: Find nearest intersection to lat/lng

I have a lat/lng pair, and I need to find the nearest street and intersection. For example: street X, corner with Y. I have Nominatim and Overpass running. My approach is: Get all ways near the lat/...
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0answers
51 views

Counting self intersection in same shapefile with ArcMap

Is it possible to count the number of intersections in the same linear shapefile with ArcMap 10.2? My license level is advanced.
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0answers
17 views

Collision analysis with line diameter in QGIS

I have some lines representing pipes. They have Z value in the attribute. I need to check if they collide with each other. So I want to know where they intersect/collide in height. I was wondering if ...
3
votes
1answer
32 views

Python shapely unary_union in JavaScript

I have seen turf.js has union() but this isn't equal to the unary_union. Or does anyone know what the unary_union actually does? Maybe I can try to recreate it, I have seen the source code in python ...
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0answers
22 views

Calculating how many acres fall within each 1 square mile section?

I am using ArcMap. I have a polygon shapefile of parcels that receive surface water from a water district. I also have a polygon shapefile of section boundaries. I want to calculate how many acres ...
2
votes
1answer
35 views

Find same names (duplicates) in one field using another feature class field

I have 2 tables (UML, PalmOil) and I would like to check record by record within PalmOil, if there are duplicates intersecting NameUMLwith NamePalmOil UML ID | NameUML | 1 NAME1 2 NAME2 3 ...
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1answer
695 views

GeoPandas intersects doesn't find any intersection

I want to check if points layer that I have intersect with polygons layer that I have, as Boolean column in the points dataframe. I have two GeoPandas dataframes, the first one is many points and ...
2
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2answers
159 views

Dividing Polygon into parts which have equal area using R

I have a Multipolygon and want to split it into parts with an equal area. How can I do it using R? my data: pol <-readOGR("/Users/Desktop/test.shp") pol_wkt <- wicket::sp_convert(pol) ...
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0answers
33 views

Intersecting large shapefiles onto a grid in QGIS

I have 21 separate shapefiles containing data for Ireland as various polygons on QGIS 3.10. I'm trying to intersect each shapefile onto a 250m2 grid of Ireland so that I'll have 21 separate shapefiles ...
3
votes
1answer
36 views

Finding intersection errors based on attribute value using ArcGIS Desktop

I have a road network table in a PostgreSQL database. The table has a level attribute which marks if a road is on the surface or if it is an under- or overpass. I would like to check the topology of ...
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0answers
78 views

Changing the method of the area command from planimetric to ellipsoid in QGIS

I am trying to use the QGIS Field Calculator to calculate the area of a feature. When I do this, the area returned is calculated using the planimetric method. This differs to $area which uses the ...
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0answers
23 views

Add the distance along the route for intersection points of polylines

I have two sets of polylines, illustrated in the screenshot (roads in purple and bridges in blue). I want to find the distance along the route for intersection point of each bridges from the starting ...
7
votes
1answer
258 views

Find the intersecting points of 2 polygons in Python

I am trying to get the intersecting point coordinates of 2 polygons in Python. For example intersecting points of the two polygons (polys2). For illustration purpose, I have marked the intersecting ...
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0answers
23 views

Speed up colouring of contour lines by creating new layer?

Related to my previous question: Colouring contour lines differently when they are inside polygons of another layer I would like to create a new layer based upon the result of the geometry generator ...
6
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1answer
118 views

Colouring contour lines differently when they are inside polygons of another layer

I'm a complete noob to QGIS. I am working with New Zealand Topo 1:50.000 data from LINZ. I have snow polygons and over them contour lines. Where the lines cross the polygons I want to change the ...
6
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0answers
89 views

How to create mutually clipping polygons

Is it possible to create buffers (in my case, but polygons in general also) that would create a boundary at their point of contact ? (so that they don't overlap on each other). Like this (from left to ...
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1answer
28 views

Intersect function is generating different outputs in ArcMap and ArcPy

I am currently running the following code in ArcPy: in_dir_temp = "D:\\X\\" x1= in_dir_temp + "x1.shp" x2= in_dir_temp + "x2.shp" y1= in_dir_temp + "y1.shp" ...
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1answer
44 views

Updating PostGIS layer with the result of intersection

I have a PostGIS layer which I would like to intersect with another layer (adjust its borders). The result of the intersection should then become the new PostGIS-layer (update the input layer). I ...

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