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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How to count a point attribute inside polygons using R? [duplicate]
I saw a lot of answers about counting points inside polygons, but none of them is about counting some attribute of the points inside polygons.
I have a shapefile of some brazilian regions, and an ...
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1answer
21 views
Using weighted species distribution data to create a scored grid map
I'm currently working on a project within ArcGIS Pro, I have a large dataset (>40000 points) comprising a list of ~120 indicator species as point data that are assigned numerical scores (1-10) based ...
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2answers
74 views
Get waterbody info from base map in Leaflet
I am plotting points on a map using Leaflet, and would like to collect any data I can concerning the water bodies that encompass these points. I have been making use of polygons from HydroSHEDS (...
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47 views
Determine which points in a CSV are within a shapefile polygon using GDAL / OGR in Python [closed]
I have a csv file containing columns with latitude, longitude and some values, and a shapefile with a few polygons. Some of my points/rows in the CSV are within, and some outside the shapefile ...
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Extracting data from one grid cells to another set of grid cells
I have my own point shapefile (each point has its lats n longs). I found a data which has lats and longs, and I imported it into ArcMap and created a shapefile which also has its own points (with lats ...
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1answer
37 views
R {sp} spatial subset: keep so many polygons as number of overlapping points
I have a set of overlapping spatial points and spatial polygons. I need to subset the polygons by overlapping points, but, if my polygon contains 2 points, I need to keep polygon twice, etc.
To keep ...
4
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1answer
97 views
Snapping/moving points near polygon to inside polygon using QGIS
I have a set of polygons (buildings) and points that I'd like to spatially join. Unfortunately, some of these points are positioned outside the polygon because all points are positioned on the ...
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33 views
Random Points with Polygon ID
In QGIS 3.4, I would like to place random points inside each polygon using a field from an attribute in the polygon layer and tag each point with its polygon id. Currently, I use Random Points inside ...
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1answer
52 views
Extract maximum pixel value vertex from a raster for a given grid cell without altering the position of the source location in QGIS
I have a 0.5 X 0.5 metre resolution raster. I would like to extract the maximum value points from the raster for every 2 metre square cell. And the extracted points should be in the centre of the ...
4
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1answer
45 views
Referencing a polygon layer in the field calculator of a point layer to make a virtual field
I have a polygon layer that shows the counties of England and a point layer of project sites. I am trying to make a new virtual field within the point layer that will reference the county that it is ...
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1answer
47 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?
Like this
Not Like this
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48 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 ...
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1answer
238 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
61 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
39 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
34 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
56 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 ...
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0answers
34 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 ...
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2answers
112 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
19 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
69 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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30 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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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) ...
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1answer
240 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)
...
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1answer
182 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
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1answer
42 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 ...
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0answers
65 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
106 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
568 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 ...
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1answer
113 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
80 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
44 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
53 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 ...
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1answer
159 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
359 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
302 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 ...
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1answer
357 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 ...
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0answers
75 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
187 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
148 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
48 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
37 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
270 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
201 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
188 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
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1answer
355 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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0answers
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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
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2answers
68 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
890 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
229 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 ...
