# Questions tagged [point]

A geometric element defined by a pair of x,y coordinates.

383 questions with no upvoted or accepted answers
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### Clustering without aggregation with QGIS Point Displacement

I've seen the following map on twitter and am looking to create the same effect for point displacement. I'm familiar with grid and circle point displacement as well as with clusters point to aggregate ...
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### Finding distance from points to the boundary of the nearest polygon in Python

I asked this question on stackoverflow.com but it seems that doing so here is a better option. Context: I want to compute the distance from points to the closest boundary of the closest polygon to ...
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### Query a different density of points based on zoom level in PostGIS

I have a database (using PostGIS) of a few million points that I load onto an interactive map. Obviously the map can't handle this many points, so I currently restrict it by limiting to the points ...
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### Groupping points to clusters containing similar number of features using QGIS

The question Using QGIS, how to cluster unevenly distributed points from the same layer to groups of about the same size / containing the same number of features? The problem I have a large point ...
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### Select subset that is spatially equally distributed

Let's say I have a table point with ~10.000 rows. Each row contains a POINT(x, y). I also have a table polygon with POLYGONS(...). The points in the point table are unequally distributed in space. ...
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### Making weight heatmap on recurring event in points layer using QGIS

I have a heatmap created on a points layer of deer-vehicle collision. Now, I want to weight the heatmap on the recurring of crash in the same area in different years. I would give weight 0 if a point ...
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### Create equidistant points along line network?

I am trying to create points at every X meters along a set of lines that represent a network. As suggested in QChainage doesn't place points evenly along dissolved lines I managed to this ...
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### How to move a point on a touch screen using esri map, dojo and javascript

I am new to map development. For touch screen devices, I need to add a point on an ESRI map and then move this point to other location on the map and get its coordinates.
629 views

### Get Distance between two point on linestring using mysql Spatial

I have a linestring and two point on this linestrin according to my picture i want distance between two point as base of linestring please hellp me
119 views

### Action: Move pointfeature to other layer - Point becomes Multipoint

I'm trying to write an action that moves a pointfeature from one layer to another. It works fine until i try to save the layer with the new feature on. He says he can't save a MULTIPOINT to a point-...
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### 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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### Making bivariate symbol map in QGIS

I am making a bivariate symbol map in QGIS in which, the size of the symbol depends on one variable whereas the color on other. For example, I have taken India data from https://simplemaps.com/data/in-...
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### Finding the nearest distance between points in a grid cell

I'm trying to find the distance between the nearest points in a grid-cell, such that there is no equivalence relation between these points. Meaning if there are three points {a, b, c}, then a = b; not ...
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### Align arrow (point layer) to water direction (line feature)

Assuming that pipes are digitizet correctly (first node as upstream, last as downstream), I need to align the arrows of a point layer to display flowmeter's direction. So far I need to use v.split (...
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### Extract values from rasterstack TIFF for point data locations in Python

I am working on machine learning algorithms for predicting wildfire sites on state level. I have a CSV of wildfire instances, that has 37 columns including a geometry column, a lat column and a lon ...
226 views

### Creating route between specific nodes based on sequence in QGIS

Right now I am working on a project related with the german railway network. I have a layer call "Stops_1_2" which contains the trip id, the stop sequence and the name of the station. I have ...
84 views

### Reducing points but maintaining attributes from original shapefile

I have a shapefile with points but there are a lot of points and I want to reduce the amount. I have tried "Points thinning" which automatically reduces the amount of points but it loses all ...
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### Point grid in QGIS

I'm working on a project that needs me to map out a point grid for drilling work. The grid needs to fall within an already created polygon and be spaced 30x35meters. I was able to overlay a pointgrid ...
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### Find distance between multiple discrete sets of points QGIS3.8

No similar question seems to relate to my issue but I desperately need help with calculating distances. I have a CSV with the residential postcode of 200 000 patients. For each patient, I also have ...
811 views

### Drawing polyline with user input points in QGIS using Python

I have an empty layer in QGIS in that i just want to draw a polyline by selecting points on layer using Python. For example, if I select a start point and endpoint on a layer, I want to draw a line ...
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### Grouping neighbor points based on field sum in QGIS

I have about 14,000 points. These points have a specific field "time", an integer value, mainly between 1, 2 or 3. I would like to split these 14,000 points into groups based on the "time" field ...
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### Is there a "Disperse Markers" option in Mapbox GL-JS?

I have used the "Disperse Markers" tool in ArcGIS before, but I am currently working on a project where I am using Mapbox GL-JS to display point data. Many of my points overlap, and I would like them ...
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### Label QGIS points layer with auto incrementing number count from 1

I have imported a CSV layer to my map and want to label the points with a numeric count from 1 upwards, counting just the visible points. I have almost found a way to do this using the ...
535 views

### Create a perpendicular line of points to another line

i have two problems over here. QGIS 1- I need to create a perpendicular line to connect multiple points to multiple lines but these lines have to follow a sequence of column. 2- And these ...
206 views

### QGIS: Style Point displacement brings too much together

I want points which are close together, about 10 mm from each other on the printed map or 500m in real world to be arranged in a circle around their center point. In other words I use Point ...
1k views

### Modify features not updating on vector layer

I have point vector layer in my application.Now I am trying to modify its coordinates. I am able to do it but its not reflecting on layer. Here is code I am using : var selectInt = new ol.interaction....
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### Algorithm to simplify a Polygon/Series of Points to a given number of Points

I have a polygon (or let's call it just a series of points). I want to simplify it (reduce the amount of points) to a given number of points. Currently I use Douglas Peucker and try to guess the ...
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### How to Interpolate very large datasets in QGIS?

I am working with a very large set of point data, (XYAttribute) which I wish to display as a raster. I've been using Interpolate, this is successful but very slow. I have other programmes that ...
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### How to Batch Change X, Y Coordinate Number in ArcGIS?

I have a huge number of points (100000 points). Some of these have the same x,y coordinates. For example, 50 points are same in x,y then 100 points are same in another x,y coordinates and so on. ...
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### Can't find point/polygon intersect using QGIS (Windows only)

Below I describe the method I am using. I have two machines: ubuntu linux, qgis 1.4 - intersection works WIN xp, qgis 1.8 - intersection does not work Hopefully, someone will find what I am doing ...
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### ArcGIS - Locate features along routes returning double results?

I am using locate features long routes using a points layer and a routed polyline network. Each point has a unique ID. My end goal is to determine is a point is to the left or right of the line. ...
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### Statistical summary of points in a polygon (QGIS)

Is there any method for calculating the average, largest value, etc. (chosen statistic value) of points within polygons and giving the calculated value to the polygon?
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### Generating Points Along Lines not starting at the start of my line feature

I am trying to generate chainage points in 50m intervals on a road system including the start and end of the line. Each road is its own single continuous line and while attempting to solve my issue, I ...
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### FME GeometryReplacer, WKT Error

I am trying to load POINT WKT Geometry from MS SQL Server, it is in WKT Format. Using the GeometryReplacer, I am receiving an Error, and everything looks right as far as I can see, it continues to ...
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### Combining polygons based on distance matrix in QGIS

I have the following layers in QGIS: a polygon layer made up of all the zip-code areas in Germany a layer displaying all the electricity grid nodes in the country. In a previous step, I created a ...
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### Aggregate points inside polygons

I have a project that I am required to aggregate points inside polygons that have a common value. Basically having QGIS to create a buffer around those points. The dark green arrows have a unique ...
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### Snap points based on attribute QGIS

I'd like to snap the blue points to the nearest yellow point based on an attribute they share on QGIS, this attribute is their suburb, I've tried by using the tool "geometry by expression" ...
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### How to get equal size cells when using rasterize in QGIS on slanted points

I'm trying to get nice, centered cells on every point. I'm using the tool rasterize in QGIS. I have gotten the method to work with uniform point data, however, I am having more trouble with slanted ...
24 views

### Unable to load CSV as viewable features

Have tried loading a .CSV using Delimited Text tool. When it Loads up, it only loads as an attribute table with no spatial view. What am I doing wrong?
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### Extract Max or Min Value from Point File Attribute and then Add XY Coordinate

I have created a Point dataset by using the Saga routine 'Convert Lines to Points'. This produces the following look and attribute table: Can anyone advise on how I can extract the maximum value from ...
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### Adding easting and northing points in ArcGIS

I am trying to add coordinates into ArcGIS 10.6.1. Below are the Northing and Easting I have been given. I have added these Northing and Eastings into an Excel sheet and saved them as a CSV File (The ...
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### Number of points in .las by PDAL from Python

I need to recieve the number of points that .las file has from Python and save it as variable. For now I'm doing it like this: def execute(self, pipeline): pipeline = pdal.Pipeline(json.dumps(...
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### Shapefile Attribute table: Automatic numbering of points arranged in (non-orthogonal) row/line based blocks, by row order + from left to right

I have a Sentinel time series of several rasters, which contain reflection values for 10 Sentinel-bands. Now I'd like to excerpt these values for given points. The sample points are arranged in pixel ...
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### Distance between points to points in QGIS

I have two points layer one has some 70,000 points (Layer A) and other has some 5000 points( Layer B). I want to calculate distance of Layer A points to Layer B Points. But unfortunately both don't ...
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### Extracting elevation value (z-value) from 3D polygon at given point with QGIS

I am working with surfaces that limit the growth of buildings or structures near airports, for this I have modeled a series of regulatory surfaces that define the maximum permissible limit that an ...
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### Create MultiLineStrings segments between points with Python Shapely

I have a layer of LineString and MultiLineString geometries. I'm trying to create a single geometry of the LineStrings split by certain snapped points. This is an illustration of the current data that ...
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### Need to join attributes from one point feature class to another based on line connectivity

I need points representing houses to have the ID number of the electrical pole sourcing the house. I would use a spatial join "WITHIN_A_DISTANCE", but some houses have sources that are ...
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### Merging 2 non overlapping points datasets

I have 2 dataset of points, each one measures a different variable, i need to "merge"(not sure if it is the correct term) these two into one dataset. My first instinct is to take a purple ...
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