Questions tagged [point-in-polygon]
A common GIS operation. Used to determine whether a point lies within a polygon's bounds.
280
questions
2
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1answer
42 views
Add multiple points correctly distributed within a polygon
I'm a little new using QGIS.
I know how to add random points within a geometry but how can I add multiple correctly distributed points within a polygon?
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0answers
34 views
Determine in Python if point is within a WGS84 polygon intersecting 180th meridian
I have a Python list of WGS84 points. Connecting these points together, we get two polygons on the WGS84 model of the Earth. I am interested in the smaller polygon which can possibly intersect 180th ...
2
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1answer
110 views
Counting number of points in each grid?
I would like to count the number of points in each cell. I have tried https://docs.scipy.org/doc/numpy/reference/generated/numpy.histogram2d.html but the out isn't appropriate. Does anybody know how I ...
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0answers
56 views
Can I make PostGIS treat polygon edges like Google Earth does?
Consider the following geographic polygon in PostGIS:
POLYGON((60 -60,60 -50,179 -50,179 -60,60 -60))
The smallest latitude is -60, so initially I expected any point with a latitude less than -60 to ...
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1answer
32 views
Exracting data fromSpatialPolygonDataFrame conditionally in R?
For some research I am working on, I have a dataframe called charters of charter schools in New Jersey. Simplified it looks like this:
school.name school.id district.id lat ...
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0answers
29 views
Point and Polygon Intersection [closed]
I have a .csv with a column for ID, latitude, and longitude, which creates points. I also have a .shp file which creates polygons of a parcel. I want to be able to attribute the polygon to the point. ...
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1answer
44 views
Point.in.polygon function in sf package miscalculate the distribution of points
I am using point.in.polygon function in sf package to determine whether a set of data fall within a polygon or not.
Here is a snippet of the data and polygon visualization
As the figure shows, there ...
2
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0answers
27 views
Using multiple fields for random points in polygons QGIS?
I'm quite new to QGIS and I have a question about the 'random points in polygons' functionality.
Is it possible to use more than one field from the attibute table when using 'random points in ...
4
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2answers
82 views
Calculate the travel time from locations to the closest N points
I want to calculate the travel time (based on walking time) from locations to the closest N points of another dataset. Then I want to create a hull around those N closest points per location
Is this ...
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0answers
18 views
Splitting a layer containing multiple polygons into multiple layers each containing one polygon [duplicate]
So firstly, I used the buffer tool in Qgis3 to create (twenty) polygons with a certain width from (twenty) points.
This lead to the situation below, where o1 and o2 are two original points and 1 and 2 ...
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0answers
54 views
Does spatial indexing speed batch Point in Polygon
I have two tables, one with 66 thousand points and other with 5.5 thousand polygons. I'm trying to correlate which point is in which polygon and it is taking a long time. I want to know if spatial ...
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0answers
29 views
What analysis tool I can use to identify the relation between points and areas
I want a binary result for each purple point in this map, i.e. whether in or out od the blue polygon areas?
In this case, one is in and the other is out. What analysis tool in ArcGIS Pro (also arcpy ...
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12 views
Assigning polygons to a feature class
I understand there’s a way or a program that can assign polygons (precincts) to a feature point.(Vote Centers)
For insistence the law states we need to assign a maximum of 10 precincts (or polygons) ...
1
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1answer
115 views
MULTIPOINT Text to list of POINT objects
I need to convert a MULTIPOINT string to a list of POINT objects. For example, suppose I have a query with ST_AsText() producing an output that is captured in my_points:
>>>print(my_points)
...
0
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1answer
62 views
Identify polygon grid in which the point belongs to?
I have a dataframe with 3 columns , which has my custom lat / long with a failure rate associated with each Lat / long
head(df)
Latitude Longitude Failure.rate
51.3 ...
2
votes
1answer
41 views
Spatial adaption of points to polygons [duplicate]
I have a point layer for the cold air flow in specific region. I would like to simplify all the single points to a polygon shape as to be able to join the data with other spatial data. My way is ...
0
votes
0answers
58 views
Identify features problem in QGIS
I am using QGIS 2.18 to identify points that fall out of a specific boundary but the identify features is not working. When I right click, it brings me the polygon feature. So i turned off the polygon ...
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0answers
91 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....
2
votes
2answers
336 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
vote
1answer
67 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
votes
1answer
62 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
...
0
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1answer
43 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?
1
vote
1answer
45 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
votes
1answer
114 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
votes
1answer
311 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
votes
2answers
181 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
256 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
74 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 ...
-2
votes
1answer
167 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
votes
1answer
113 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
votes
1answer
32 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
votes
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
votes
1answer
191 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
vote
1answer
158 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
vote
1answer
135 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
316 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'...
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vote
0answers
61 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
67 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
votes
1answer
696 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
votes
1answer
199 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
vote
0answers
283 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
133 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
votes
2answers
304 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
2k 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
35 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
184 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
323 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 ...
3
votes
2answers
257 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
vote
1answer
475 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
votes
1answer
84 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 ...
