Questions tagged [point]

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

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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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6 votes
1 answer
454 views

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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5 votes
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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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4 votes
2 answers
90 views

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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4 votes
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44 views

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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  • 41
4 votes
0 answers
381 views

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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4 votes
0 answers
226 views

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.
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4 votes
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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
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4 votes
0 answers
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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  • 605
4 votes
2 answers
418 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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3 votes
0 answers
138 views

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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  • 97
3 votes
0 answers
184 views

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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  • 163
3 votes
0 answers
45 views

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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  • 69
3 votes
0 answers
259 views

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 ...
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3 votes
0 answers
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 ...
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3 votes
0 answers
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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3 votes
0 answers
695 views

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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  • 127
3 votes
0 answers
38 views

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 ...
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3 votes
1 answer
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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  • 171
3 votes
0 answers
151 views

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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  • 165
3 votes
0 answers
312 views

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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  • 31
3 votes
0 answers
355 views

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 ...
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3 votes
0 answers
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 ...
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3 votes
0 answers
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 ...
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3 votes
0 answers
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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3 votes
0 answers
2k views

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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  • 218
3 votes
0 answers
577 views

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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3 votes
0 answers
919 views

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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3 votes
0 answers
824 views

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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3 votes
1 answer
775 views

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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2 votes
0 answers
20 views

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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2 votes
0 answers
51 views

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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  • 21
2 votes
2 answers
72 views

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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  • 475
2 votes
0 answers
48 views

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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  • 51
2 votes
1 answer
85 views

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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  • 21
2 votes
0 answers
35 views

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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  • 71
2 votes
0 answers
26 views

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 ...
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2 votes
0 answers
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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  • 21
2 votes
1 answer
101 views

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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  • 71
2 votes
0 answers
961 views

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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2 votes
0 answers
136 views

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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2 votes
0 answers
23 views

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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  • 447
2 votes
0 answers
45 views

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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  • 83
2 votes
0 answers
84 views

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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  • 21
2 votes
0 answers
241 views

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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2 votes
0 answers
46 views

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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  • 93
2 votes
0 answers
57 views

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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  • 137
2 votes
1 answer
41 views

Export one point with shared origin value in attribute table

I am trying to find a way to export unique points from a pointlayer in QGIS. Using the tool ‘Extract vertices’, I generated corner points from polygons in the input layer (first image). I now only ...
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2 votes
0 answers
123 views

No geometry when importing points from CSV

I'm having problem importing a point layer from Excel. I've saved the Excel file as a CSV and added it to QGIS (2.18) through 'Add delimited text layer' I've checked in semicolon and choosen the right ...
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