Questions tagged [point-in-polygon]

A common GIS operation. Used to determine whether a point lies within a polygon's bounds.

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Checking points in polygons using Python [duplicate]

I have 2 dataframes, the first one contains 100 rows and the second one too. The first one contains buildings and their coordinates. The second one contains coordinates of parts of map and information ...
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Drawing a square manually using coordinates

I've load points coordinates from a .csv file on QGIS. These points are the intersection of a regular grid. I would like to select manually four point of this .csv file to draw a square polygon. Also,...
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Identify if the point lies inside the polygon in QGIS

I created a polygon using Iso-Area as polygons algorithm in QGIS. I have a point's coordinates and added it as a vector layer into QGIS. It is shown on the map that the point lies within the polygon. ...
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Checking if the point lies within the polygon in R using sf package

I have a point's coordinates as well as an object with the class of sfc_polygon in R. I would like to check if this point lies inside that polygon or not. I created an object with the class of ...
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Counting points inside polygons by attribute using ArcMap

I am working with ArcMap 10.8 and extensions. I have a grid (polygons) and another shapefile of points. I need to generate a field in the grid that shows me how many points are inside each cell, but ...
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Seeking Python solution for point, line, and poly in poly intersections [closed]

I'm just learning Python, and I need a little direction. I've been reading many of the posts on this site, but I haven't found one that puts me on the right path. These operations are trivial in GIS ...
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1answer
140 views

Picking up the coordinates inside this polygon draw

I already have a geojson being consulted and that is plotting these black dots. And then I inserted the leaflet-geoman plugin to give users the freedom to create polygons on the map. Basically draw ...
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What strategies exist to speed up point-in-multiple-polygon searches? [duplicate]

Consider a scenario where you have polygons representing the border of every country in Europe. You also have the Lat/Long of a user's mobile device. You now want to display which country that user is ...
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Why is 'Count Points in Polygon' returning zero values for all NUMPOINTS?

I'm using QGIS and I have a file of points (Coyote_Clipped). I'm trying to count the number of points in each grid cell. I ran "Count Points in Polygon" on the grid and it worked without ...
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Counting Points in Polygon to analyze data using QGIS

I am using QGIS, and I have a shapefile that has 23 different land classifications. I have another file that lists coyote observations as points. I would like to find out how many coyote observations ...
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Polygon to Point Grid with the same information

I want a grid of points (with defined spaces between them) inside a Polygon. All the points should contain the same information as the original Polygon did. I tried the centroid (only one point -> ...
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Why am I getting this error when using count points in polygon?

I'm using QGIS 3.16.1 and trying to work with the 'count points in polygon' feature. When I try to run it I get this error: *QGIS version: 3.16.1-Hannover QGIS code revision: b381a90dca Qt version: 5....
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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 ...
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Calculating frequency of polygon types overlapping coordinate point

I have shapefiles of sea ice coverage for multiple days of the year. At each time-point (day) the sea ice is split into different polygons which corresponds to different ice types (i.e. fast ice, ...
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229 views

Combining CSV and shapefile to find area name where stations are located

I have one shapefile with marine areas. The other is a CSV file with some station names and coordinates. I would like to get table with stations names and corresponding marine area names, where the ...
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Generating random points with overlapping polygons in QGIS

The "Random points inside polygons" tool in QGIS works great to generate a fixed number or density of points within polygons; however, because QGIS does not link the polygon ID to the points,...
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Preventing labels from overlapping certain features using QGIS

I have two layers in my QGIS Project (QGIS 3.4.8). One in the foreground, which contains surfaces, and one in the background, which contains a point with labels, see image below: The problem is that ...
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How to choose limited number of points to represent a point grid

I need to choose a few points to represent the grid below, e.g: 8 points in the grid below. This point need to be geographic distributed This points needs to be geographic distributed. Lets see a bad ...
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Using QGIS to buffer attributes on map

This is my first experience of using GIS systems. Firstly, to give you an overview of my project, I am trying to analyze the obesity rates within the boroughs of London. I have gotten to the point now ...
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1answer
97 views

Calculating minimum distance between two point layers within polygons in QGIS

I have three vector layers two points and one polygon: Centroids (POINTS FROM) NUTS_ID | CNTR_CODE | NUTS_NAME | id Sorting_plants_2020 (POINTS TO) postcode | name | where | capacity | id ...
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Calculating value of unique points in polygon in PostGIS

I'm working with a spatial PostgreSQL database that contains species records, there is a point layer 'spp_points', each point has a "spp_ID" and "spp_score" field. I also have a ...
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Generating equidistant Points inside box which also contains MultiPolygon [duplicate]

I have a box bounded by min_x, min_y, max_x, max_y, I also have a multipolygon = poly contained in that box. I'm trying to equidistantly scatter points throughout that box, outside of that ...
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Getting attribute form data from another layer

I’m trying to use the attributes form in QGIS 3. Most of what I’m doing is relatively simple use of combo boxes but I’ve run up against a wall. The idea is that I’m trying to streamline how we notify ...
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84 views

Updating table from another table with function ST_CONTAINS in PostGIS

I tried to update an attribute 'solved' of a polygon table (table name: polygon) by using an attribute 'solved' of another point table (table name: point). What I want to do is that if ALL the points ...
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1answer
79 views

Spatial joins in ArcMap (points to polygons) - capturing points that are just outside of outer boundaries

I am working with geocoded crime event data, and attempting to join that point layer with a census block group layer in order to get a count for each census block group (and ideally sums/averages for ...
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Automatically output joined fields in input layer while using spatial join

For example, I have two layers: A polygon layer city block with a ID field city block index. A point layer parking lot with a field parking lot size. I want to know the total parking lot size for ...
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37 views

Returning all points within a polygon

I've been trying to figure out how to use ST_Contains to figure out what points are contained within a polygon. Here is my query. SELECT "userId", "firstName", "lastName",...
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Aggregating data and displaying counts with GeoPandas

I have two datasets that I want to use. The first is a shapefile of King County that has polygons broken up by school districts. It has boundaries saved as polygon features on a geo-dataframe. The ...
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1answer
63 views

How to generate a column with a count of number of points in a polygon AND have 0 for the rows where there are no points in the polygon?

I have two data sets with a large number of points that I’m organizing into a hexbin grid. I'm associating these points with the hexbin polygons by using PostGIS to determine if a point falls within a ...
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1answer
77 views

Count points within a polygon

I'm trying to count the number of points within a polygon of a fixed size in R. I'm planning to do it a few times so that I can eventually calculate average density of points with some measure of ...
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2answers
62 views

Spatial Join also Based on Attributes using QGIS

I have two data sets: points with a timestamp polygons representing neighbourhoods I need to compute how many points are in each neighbourhood polygon, based on a time range. So in other words, how ...
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Dividing country into regions based on some initial center point using ArcMap

I am new to GIS. I have some lat-long (say 5) spreads across a country and I want to make polygons around each point such that all the polygons cover the whole area of the country and within the ...
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st_intersection only if specific conditions are satisfied

I'm new to sf package. I have two sf files, one containing lat/long position of points (point_sf) and the other one containing sf polygon geometries (polygon_sf). I want to see which points belong to ...
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2answers
63 views

Determining how many of my coordinates overlap with layer in QGIS

I am working on a project about a certain animal species. I have gotten coordinates from where the species has been observed. Now I want to know what percentage of the observations are from gardens/...
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196 views

Counting points in polygons by weight and class in QGIS

I have seen a similar question to Counting points in polygon using weight and class simultaneously, but I was unable to operationalize the answer that I found so far. I have a point layer with ...
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1answer
68 views

Counting points in polygon using weight and class simultaneously

I am using QGIS 3.1. I am wondering if there is a way to count points in polygons but by using both the weight and class. For example, I have distributions of a number of species, each with a unique '...
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1answer
265 views

Fastest point-in-polygon solution with billions of points over thousands of polygons

Problem definition is quite simple: I need to achieve point-in-polygon detection for: billions of lat/lon points over thousands of polygons I need to be able, for every point, to determine if it is ...
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Entry and exit point of the polygon

I would like to add to the attribute table somehow quickly a column containing the entry and exit kilometre data. I have the available point layer with kilometre, road axis and polygon as shown: ...
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319 views

Count points in polygon grouping by attribute using PyQGIS

I have a point layer with an attribute table like this: id_point class 1 A 2 B 3 A 4 C 5 B ... What I need is to count how many points of ...
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Counting and print number of points from a CSV in a series polygons / buffered points in GEE?

I'd like to compare the number of calls from gps coordinates to the population around those coordinates in Google Earth Engine. My plan was to count the number of incidents (points from a table: ...
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1answer
41 views

Count points by non-continuous polygon in QGIS

I'm very new to QGIS and I'm learning by practice and reading both QGIS documentation and StackExchange answers. However, I think one of the main tasks has been naming the concepts correctly and look ...
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1answer
45 views

QGIS Random Points in Polygon PRESERVING Attribute Table?

I have a complicated shapefile of overlapping polygons. I need to generate random points inside each polygon, which is easily accomplished using Vector -> Research Tools -> Random Points Inside ...
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Calculating where map coordinates land within a collection of district boundaries? [duplicate]

The following coordinates make up the district boundaries of Westminster in the UK (point-to-point polygon): 51.4859, -0.1295 51.4846, -0.1498 51.4978, -0.1561 51.4978, -0.1796 51.5259, -0.2062 51....
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Fast solution to load and query shape files

I work on a .net core web API application collecting fishing events with latitudes and longitudes. For each of these positions, I need to compute the corresponding Exclusive Economic Zone (EEZ), it's ...
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1answer
32 views

ArcMap: Identify mismatch between position of points from database with their actual location in polygons

A map in ArcMap contains two datasets: Points J_i from table Jurisdiction of an SQL-database (SQL Server 2017) displayed by Display XY Data (Data Type: XY Event Source) Polygon shapefile feature ...
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1answer
105 views

Points within Polygons given certain conditions

I am trying to locate all the points within a set of polygons given a certain condition on the polygon in MongoDB using Python 3x. This question differs from the other ones because i) it requires ...
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1answer
31 views

Changing index order of points within the same polygon

I am currently trying to get rid of a waterway that divides my polygon. The problem is that the points are part of the same polygon but are around 190 rows away for each other. Is there a way to ...
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28 views

OD matrix with origin and destination points based on polygons selections

I'm new in QGIS, and I would like to create an OD matrix. I have two shapefiles: one which contains the origins with POINTS(lat, long), and another one with destinations POINTS(lat, long). Each one of ...
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57 views

Optimising use of st_within for parallelisation

I'm trying to use st_within() to calculate points within polygons on a fairly complex shapefile. This operation tends to take 4-5 hours which is a bummer for debugging the code. I have access to a ...
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25 views

Calculate 70% of the area inside a polygon based on the polygon centroid

I am trying to generate an area within a polygon based on the polygons centroid that covers 70% of the containing polygons area. I generated the polygon centroids as points but I do not know how to ...

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