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Questions tagged [point]

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

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5 votes
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Automating lines between existing points within polygons

I have a task that I do on a regular basis and was looking for a bit of assisting learning the best way to tackle automation on this. Brief Each blue point has to be connected to the orange point ...
ScoGer's user avatar
  • 315
5 votes
0 answers
182 views

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. ...
four-eyes's user avatar
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5 votes
0 answers
1k views

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 ...
Thane Brimhall's user avatar
4 votes
0 answers
144 views

Map projection which is most accurate in the (global) calculation of "Poles of Inaccessibility"

I would like to calculate the "Pole of Inaccessibility" in QGIS for several polygons. The polygons (administrative boundaries of countries) are globally distributed. When calculating in ...
rseo's user avatar
  • 41
4 votes
0 answers
69 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 ...
Luca's user avatar
  • 41
4 votes
0 answers
397 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 ...
Ola Hammarström's user avatar
4 votes
0 answers
471 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 ...
Albert's user avatar
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4 votes
0 answers
412 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 ...
dfinger's user avatar
  • 41
4 votes
0 answers
256 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.
Gustave Folou's user avatar
4 votes
0 answers
678 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
Ashish Srivastava's user avatar
4 votes
0 answers
128 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-...
Max's user avatar
  • 625
4 votes
2 answers
700 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 ...
Stefan's user avatar
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3 votes
0 answers
126 views

Effective points clustering using PostGIS

I want to implement clustering points like here in the last example(with big and small points): https://www.crunchydata.com/blog/postgis-clustering-with-dbscan I have a table in PostgreSQL with ...
hifichevymane's user avatar
3 votes
0 answers
219 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?
Koko's user avatar
  • 31
3 votes
1 answer
418 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 ...
GravitaZ's user avatar
  • 535
3 votes
0 answers
122 views

Evenly distribute some points in different polygons (blocks)

I need to evenly distribute some points in different polygons (blocks) that I have within a study area in QGIS. Does anyone know any tool or way to do it?
Juan's user avatar
  • 131
3 votes
1 answer
6k 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 ...
Louis Tate's user avatar
3 votes
0 answers
534 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(...
Марина Лисниченко's user avatar
3 votes
0 answers
323 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-...
rgt's user avatar
  • 107
3 votes
0 answers
384 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 ...
Lime's user avatar
  • 173
3 votes
2 answers
4k views

Creating path between many points in Google Earth

Is there any specific way to convert approximately 25000 points in Google Earth Pro to paths or draw paths between points automatically? Since I want to obtain their altitude data, I need it to be a ...
Nima's user avatar
  • 31
3 votes
0 answers
81 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 (...
Arthur's user avatar
  • 69
3 votes
0 answers
780 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 ...
marie Lenihan-Clarke's user avatar
3 votes
0 answers
517 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 ...
Bastian Radler's user avatar
3 votes
0 answers
235 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 ...
Mary's user avatar
  • 31
3 votes
0 answers
1k 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 ...
ASanders's user avatar
  • 157
3 votes
0 answers
49 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 ...
Dee_ell_ess's user avatar
3 votes
1 answer
1k 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 ...
Virat ABD's user avatar
  • 171
3 votes
0 answers
207 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 ...
Petey's user avatar
  • 165
3 votes
0 answers
231 views

Add polygon attributes to points fails to create layer

I'm trying to add polygon attributes to a point file with a lot (~370,000) of points in QGIS v3.0.0. I first tried using the point sampling tool, which I've used with success pulling the values from ...
Brian Fisher's user avatar
  • 1,133
3 votes
0 answers
422 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 ...
Megalithic's user avatar
3 votes
0 answers
719 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 ...
Frederico's user avatar
3 votes
0 answers
260 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 ...
Benjamin Donner's user avatar
3 votes
0 answers
2k 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....
Veena Hosur's user avatar
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 ...
Robin's user avatar
  • 218
3 votes
0 answers
633 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 ...
jbowkett84's user avatar
3 votes
0 answers
952 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. ...
BBG_GIS's user avatar
  • 5,825
3 votes
0 answers
832 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 ...
yair suari's user avatar
3 votes
1 answer
844 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. ...
Alan Carr's user avatar
  • 2,473
2 votes
0 answers
54 views

Building route on defined graph of roads with intermediate stops in QGIS

I have a layer with stops of public ground transportation routes. I also have a layer with a graph of roads where public transportation can go. I need to build a route from the first to the last ...
Anna Mogilevich's user avatar
2 votes
0 answers
24 views

Isolating points from a line shapefile (and check the attributes from specific points) using QGIS

I am new to QGIS and spatial data handling. I have a shapefile of a boat track and a shapefile of the border between two countries in QGIS. Parts of the boat tracks are in the waters from country 1 ...
FanCou's user avatar
  • 21
2 votes
0 answers
158 views

ST_Transform returning different results in PostGIS 2.4 and PostGIS 3.0

I am facing a problem with the function st_transform()and here is my analysis of this pb: Example of SQL query with different results depending on PostGIS version: select st_astext(st_transform(...
moobster's user avatar
2 votes
0 answers
189 views

QGIS Interactive PDF Map - Pop Up Images

I am a new user and still learning. I created a map that when the user selects specific points on it, a pop-up image displays. Is it possible to export this map as an interactive pdf and keep the pop-...
Lincoln's user avatar
  • 21
2 votes
0 answers
101 views

Add raster and vector layer values to millions of points (QGIS)

I need to create a CSV file with the values of 10 rasters (30m pixel resolution) and 5 polygon layers. Each row of the CSV should represent one pixel of the rasters and the columns should contain the ...
Kajo's user avatar
  • 691
2 votes
0 answers
134 views

Calculate a correction factor between two sets of data

I'm a data science student and have a problem with harvesting data.There are two sets of geographic data (stored as points) that stores the yield of a soybeans harvest in the same field, they are from ...
GhirghiFarming's user avatar
2 votes
0 answers
65 views

QGIS Atlas point for each column attribute

I want to automate the export of maps of a point layer automatically for each of the columns of the attribute table. It's possible? SP_A1 _Defo_m _Deco_m _Int_t1 _Int_T2 _Int_T3 _Int_T4 _Int_T5 E....
Alejandro Chamizo de Castro's user avatar
2 votes
0 answers
317 views

Heatmap changes to single color when zooming out in QGIS

Working with QGIS 3.28, I have a point layer with several million points. Using heatmap renderer, I get the left heatmap with these settings: scale 1.100.000 radius 200 meters at scale Maximum value: ...
Babel's user avatar
  • 73.1k
2 votes
0 answers
397 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 ...
Karyssa's user avatar
  • 21
2 votes
0 answers
84 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 ...
Titan's user avatar
  • 51
2 votes
0 answers
191 views

Group points based on proximity and equity using QGIS

I would like to group students based on the nearest school, but also having mixed social categories within the group of students. I have x,y coordinates for the students and the shcool. Each student ...
DBeau's user avatar
  • 21

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