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Geographic Information Systems

Questions tagged [point-in-polygon]

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

263 questions
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75 views

Uncompressed vs Subdivided: which one offers better PostGIS INTERSECTS performance?

In my PostGIS I have a point table (roughly 51 millions rows) and a multipolygon table. I need to find a polygon label/ID for every single point in my point table (roughly 51 millions rows) in PostGIS....
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2answers
62 views

Combining st_join with st_nn to include all points within, as well as within a given distance of a polygon

This is a follow up to my earlier question (Spatial join in R - Adding points to polygons with multiple corresponding points). I have successfully joined a spatial points file to a polygon file in R ...
1
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1answer
37 views

Simple point in polygon query at PostGIS & PostgreSQL

Using PostGIS & PostgreSQL (Amazon RDS instance), I need to create a (quite large) table with points (just x, y coordinates) Then what I need to do is very simple point-in-polygon queries. Points ...
2
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1answer
52 views

Find a point in a multipolygon geometry

I need to know which points from Table 1 are contained in Table 2. In Table 1 I have longitude and latitude and I made points with ST_SetSRID(ST_MakePoint(d.longitude, d.latitude),4326) as geom ...
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1answer
38 views

Automatic polygonising in QGIS? [duplicate]

I have multiple points and I need to create polygons that consist specific amount of points. How could i do this?
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1answer
34 views

Check if point in GIS polygon fails to produce correct output

I've tried many, many many, ways to find out if a point is in a GIS polygon based on many great posts, but I can't get any to work properly. Specifically I created a grid of points covering the ...
0
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1answer
50 views

Check if a VERTEX of one polygon falls anywhere within the boundary of another polygon (in Python)

This is different than simply containing, overlapping, etc. For example, imagine a circle partially overlapping a square: The circle and square both overlap each other, both intersect each other, but ...
0
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1answer
146 views

Joinn shapefile attribute ID to point in R

I have a CSV file (about 1,000,000 georeferenced points) which contains point_id/latitude/longitude. I also have a shapefile which represents a grid cell_id/xmin/xmax/ymin/ymax. I am trying to join ...
2
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2answers
64 views

QGIS Points in a Polygon extract name information from Individual polygon

I am new to QGIS and need to know how to extract names and address' from the points in certain polygons. My main layer has all the points on the maps and then I drew the polygons on the map. I then ...
0
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1answer
112 views

Lines in Polygon Analysis

This question is similar to the "points in polygon" analysis, but I want to keep the attribute data for multiple lines within a single polygon. The data source is multiple line segments representing ...
0
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0answers
67 views

Finding out which U.S. state a tweet was generated in

I have a database of records with latitude and longitude information (imagine this is a CSV file containing tweets and their geo-coordinates). I also have shapefiles of U.S. states. I want to add ...
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1answer
111 views

Stratified random point sampling in Python

I have a very basic knowledge in Python and arcpy. I want to create a stratified random sampling point on a continuous polygon. So far, I have dissolved the polygon (according to categories) and ...
2
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1answer
95 views

QGIS - count points in polygons

I use QGIS 2.18.26. I have a layer with 10 million location points over which I lay a 1m by 1m raster. Then I want to count the number of points in each 1m² of this raster. When I launch the count I ...
0
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1answer
19 views

Adding field of intersected polygons in points using ArcGIS Desktop? [duplicate]

I have some points and polygons in an area. I want to add a field in those points that tell what polygons have been intersected by those points and not only what polygons but a specific attribute of ...
0
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1answer
35 views

Joining data points to polygon using ArcGIS Desktop?

I have precipitation data points separately as a shapefile in one layer and I also have a polygon shapefile from where the precipitation data was collected. How do I join these two layers and compute ...
2
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1answer
97 views

Selecting points within polygon using ArcGIS Desktop?

I am using ArcGIS Desktop for the first time in many years. I have a postal sector layer under a series of merged drive time boundaries. How do I select just those postal sectors which fit within ...
1
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1answer
60 views

point.in.poly (spatialEco) returns non-intersecting points

I just updated the spatialEco package for R, and now the point.in.poly function behaves differently from previous behavior. Previously, it returned only points that intersected at least one of the ...
1
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1answer
97 views

Count points in polygon (weighted) for multiple attributes in QGIS 3 in one go

Is there a way to count weighted points inside polygons for multiple attributes at one time? I can count weight points (below) for an individual attribute, which creates a new polygon layer with an ...
2
votes
1answer
231 views

Count points in polygon (weighted) in QGIS 3

In QGIS 2 you could perform a weighted point within a polygon layer using Processing toolbox > Vector Analysis > Count points in polygon (weighted). I could well be missing something, but I can'...
1
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0answers
47 views

Generating defined rectangles (size, position) as a new shapefile layer in distance to specific points from another shapefile layer in QGIS

I'm familiar with the basics of QGIS, but now I'm confronted with a difficult task. I want to create a new shapefile (as a layer) which contains defined rectangles (size, position) from another layer ...
1
vote
2answers
64 views

Points in polygon doesn't count points [duplicate]

Using QGIS 2.18.17, I'm trying to count the points in this polygon but I'm not able to do it. What I have done: Loaded mapbox map (EPSG:3857) Loaded CSV-file with the points (EPSG:32633) Used ...
0
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1answer
407 views

Spatial joining/merging two spatial points data frames in R via buffer?

I'm trying to spatial join/merge two spatial points data frames in R. One data frame is lacking IDs, which is the information that needs to be joined to the other data frame. To be specific, any point ...
0
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1answer
152 views

Points in multiple polygons

I have two spatial objects, one polygon and one points. The polygons may overlap. I would like to associate each point with ALL the polygons it falls in. When the polygons do not overlap, I can do a ...
1
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0answers
207 views

Spatial analysis and parallel processing in R

I am trying to do a point-in-poly analysis using R. I have 4.5 million points and 5k polygons. This is computationally intensive. I was pointed to parallel processing through another post and tried to ...
0
votes
1answer
116 views

Counting points in polygon using QGIS?

I use QGIS 2.18.16. I import 1.000.000 data points, from a text document, as a CSV layer. Then I add a raster of 5 by 5m over those points. Project, layer and raster are put in the same CRS (...
0
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2answers
147 views

Combining attribute table of polygon and point shapefiles using ArcGIS Desktop?

I am fairly new to using ArcGIS Desktop. I am working with two different types of data. The first is a large shapefile that contains small polygons that distinguish different types of vegetation. ...
1
vote
1answer
939 views

python mask netcdf data using shapefile (xarray & geopandas)

I am using the following packages: import pandas as pd import numpy as np import xarray as xr import geopandas as gpd I have the following objects storing data: print(precip_da) Out[]: <...
1
vote
1answer
32 views

How can I do operations with points inside a buffer in GIS

I have a dataset with around 4k schools for with I have their location (longitude and latitude) and enrolment which I have uploaded to a GIS map. I want to do an operation with the competing schools ...
3
votes
1answer
130 views

Using python Point-In-Polygon operation to join grid with points based on points falling within grid?

I want to know how to select values from the xarray DataArray based on the location (geo_df.geometry) and time (geo_df.plant_date & geo_df.cut_date) of rows in the geopandas GeoDataFrame. I want ...
3
votes
1answer
206 views

Counting occurence of unique points across large grid using QGIS?

I am attempting to map out, in a 10x10 km grid, the occurrence of unique plant species. I have used the "Points in Polygon" feature to count and map the unique points across the grid, however I have a ...
4
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2answers
227 views

Using LAT/LON in Leaflet with Geoserver GeoJSON?

We're building a simple application that takes the result of a geococde and determines which school boundary the point resides. I'm trying to figure out if I should be doing this using a ...
1
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1answer
362 views

PostGIS speed up query

I know this question (or a version of it) has probably been asked but I cannot seem to figure out a solution to my problem. The core spatial operation is finding which of my points are inside ...
0
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1answer
71 views

Checking if point is contained by any geometry

I have a table of geometries (mixed MultiPolygons and Polygons), I want to check if a point is contained by any of the geometries in the table. I don't care about how many, nor I want to retrieve any ...
1
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1answer
207 views

OpenLayers - Dot Density map

I'm trying to create a dot-density map with OpenLayers (OL) and GeoServer. I've a counties shapefile and I'm creating a vector layer in OL with county shapefile set as source for the vector layer. I ...
2
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3answers
118 views

Assigning each point name of polygon in which it lies using QGIS?

I am completely new to QGIS, and to the world of shapefiles and GIS in general. I have the shapefile of a city, divided into its districts. On top of it I add a layer from a csv, with a certain ...
2
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1answer
123 views

QGIS 3.0.2 NNJoin doesn't complete. Crashes when close status bar

I have run a large spatial point to polygon join of 2 million points to 657 polygons. I used NNJoin so that the closest polygon will be assigned to a point if the point does not lie within one. The ...
2
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1answer
50 views

QGIS spatial query - points within certian elevation contour intervals

I'm struggling to find a way to identify all the points within certain contour intervals. I have a raster dataset that I generated a contour map from. Within the region of interest, I have a specific ...
4
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1answer
3k views

Detecting if GPS coordinates fall within polygon of points?

I'm looking for a simple explanation on how to detect if GPS coordinates fall within a polygon of points. I would prefer an explanations that can be done using paper and pencil and not programming ...
3
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1answer
375 views

Find if lat/long point is inside an area

I have got data using OpenStreetMaps Ways of many areas. I would now like to write a function which would return "true or false" if an single latitude/longitude point is found in that area or not. I ...
0
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1answer
142 views

Creating equally spaced points within shapefile with multiple polygons using QGIS?

In QGIS 2.18. I have a vector shapefile with multiple polygons, all of these are squared and have their own attributes. Inside these polygons I will have more (small) polygons that will represent ...
1
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0answers
37 views

ArcGIS JavaScript API find the polygon a point belongs

I have a shapefile containing polygons and whenever a user searches an address I store latitude and longitude of the location. I want to know which polygon this address belongs and I have id assigned ...
2
votes
1answer
228 views

count points in polygon returns wrong counts in QGIS 3.0.1

In QGIS 3.0.1, the vector analysis algorithm 'Count points in polygon' is returning wrong counts for some polygons. The counts returned for all of the polygons which do not contain any points appear ...
3
votes
2answers
183 views

Assigning projections in loop using R?

I'm using R to do some geospatial analysis. Basically, I am trying to solve for a method of doing poly.counts when my data is too large for my laptop (and R complains about the matrix being too large)...
0
votes
1answer
63 views

Finding area within set radius using QGIS?

I'm new to QGIS and I want to use it to model the land area within a 90km radius of a point. I have my location and I have 32 shapefiles and I would like to draw a 90km radius around my initial ...
3
votes
2answers
278 views

Auto-updating count of points in polygons?

I have a Point shapefile and a Polygon shapefile. Is it possible to create a field into the attribute table of the Polygon shapefile with the count of points inside each polygon, such that if I add a ...
1
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1answer
208 views

point.in.poly (spatialEco) in R doesn't add all attributes to points in the newest version?

Recently an update became available for spatialEco, an argument poly.id was added, allowing you to work NA's (after this discussion). For some reason the attributes from the polygons are no longer ...
1
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1answer
197 views

Using QGIS, automatically create n polygons fully covering an area without overlap with an approximately equal number of points in each polygon [closed]

I'm trying to avoid/simplify the following manual process intended to create a polygons layer with exactly n polygons so that each polygon encloses the same or close to the same number of points in an ...
3
votes
0answers
49 views

Dynamic filtering based on selected Layer in ArcGIS Desktop?

I am not sure this is even possible, I have about 38 geographical polygon layers showing areas of the UK, I also have a query (point layer) that shows all of the offices around the uk. What I am ...
0
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1answer
237 views

Optimal point distribution within polygons [duplicate]

I have a polygon and want to distribute a certain number of points within that polygon. The Points should have almost the same distance to each other and also to the boundary.
0
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1answer
652 views

Determining if point on boundary using shapely? [closed]

I'm new to Python, and I want to test if a certain point lies ON the (boundary) of a polygon - not inside, not outside, just if it's on the boundary. The points and polygon already defined polygon = ...

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