Questions tagged [point]

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

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5
votes
1answer
103 views

Mixed symbology for point layer in QGIS

I have a point layer which symbolize trees. This trees has fields "Specie" and "Diameter" among others. I would like to symbolize them by size depending on the "Diameter" ...
5
votes
1answer
36 views

Copying a field (column) value from a Voronoi polygon into the point inside that polygon

I'm relatively new in GIS and I am using QGIS. I'm trying to find a way to copy a field value from a voronoi polygon layer into each point that is currently inside the said polygon. Each voronoi ...
10
votes
2answers
500 views

Convert vertices of polygon features to points using Virtual Layer in QGIS

I have a polygon layer and want to use a Virtual Layer that creates points from the vertices of the polygon layer. The question is how to write a query that does this? I am aware of the tool "...
4
votes
1answer
274 views

Extracting x,y coordinates from `QgsGeometry: Point(x, y)` using PyQGIS

I'm trying to extract the coordinates of a feature vertex. When I write on my editor print(vertex) what I get is <QgsGeometry: Point(58746.43000004297, -256665.088999123)> But when I try to ...
4
votes
1answer
139 views

Removing intersect or overlap of points in the same vector layer

Is there anyway to remove the intercept part of the vector points? P.S. Please ignore the red circle, it's not a polygon, it is a hand drawn by me to show the error part So far I've done: "...
4
votes
1answer
53 views

Adding Z-dimension point to layer

I have a point. I want to add to a Point layer in QGIS 3.16, but I can't get the Z-dimension working on my layer. The point is created but has no z-value... coord = qgis.utils.iface.activeLayer().crs()...
1
vote
1answer
39 views

Area commanded from given point

I want to define the area below a contour that slopes at a particular angle (say -0.05%) from a particular point, for many points. I have a DEM, and can compute contours at a particular level (say 200 ...
0
votes
1answer
19 views

Combining information from two point layers based on the nearest neighbour relationship

I have two layers: One a modeled dataset with points on a 1x1km grid across the globe. I also have another layer which is my own data points which are scattered across the globe. What I want to do is ...
0
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0answers
46 views

Importing gpx track points as vector layer using PyQGIS

I have a gpx track and want to import it to QGIS using PyQGIS. When I add the gpx manually (add vector layer), I select track points, and get all the points and attributes with the new layer: When ...
2
votes
1answer
62 views

Determining the Coordinate system for set of points

I have the following set of points. X Y 618263.27 6153928.04 601343.35 6492627.09 670869.41 6448843.47 499463.38 6201245.29 569373.30374535 6140971.32153155 579069.9206 6142002.1728 587240....
9
votes
1answer
265 views

Re-locating points randomly at certain distance in QGIS

I have GPS coordinates which identify aid projects in Africa. Now, I want to re-locate these projects, such that each project is re-located by 100 km in a random direction from its original location. (...
9
votes
3answers
2k views

Perpendicular lines on line using QGIS

I am using QGIS. I want to create perpendicular Lines on another Line (River). The Lines should be created on points on the Line and should have a length of 40 Meters. I want to create the red lines ...
3
votes
1answer
264 views

Buffer around Point is elliptical, not circular

I'm trying to create a circle around a point using the code from this answer here. Adding below for better visibility as well from functools import partial import pyproj from shapely.ops import ...
2
votes
3answers
227 views

Digitizing and adding attribute values to the points in QGIS

I want to build a digital terrain model from nautical charts. I need to capture the points where depth is indicated in the chart, and for each point, I must attribute the depth value. One by one, to ...
1
vote
1answer
18 views

Giving points in the same delimited text layer multiple colours-while using point displacement

I want to give multiple colours to points within the same delimited text layer, while using point displacement, looking for advice on how best to do this. The data are showing occurrences of a variety ...
4
votes
2answers
106 views

Why is the following CSV file not being loaded as a points layer in QGIS?

I've been trying to add a certain CSV file as a points layer to QGIS for a while now, without much success. It can be viewed over here. (It was adapted from this .xls data file). In the online ...
0
votes
1answer
42 views

Showing labels just for a specific point type [duplicate]

If I have a bunch of points all on the same layer and they are all categorised by different types in the Attribute Table, is there an easy way to just show labels for one type and not the others? ...
2
votes
0answers
59 views

Querying over multiple bands at one point

I have a multiband raster in PostGIS. I can obtain the value for a specific band at a specific point with SELECT ST_Value(rast, band, ST_SetSRID(ST_MakePoint(x, y), srid)) FROM table; I have 12 bands ...
1
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0answers
32 views

Random sample of points to calculate K function on a large point set

For a point pattern analysis in R, I want to study a relatively large point dataset (about 1 million points) with a cross K function to compare different categories of points. Including a Montecarlo ...
2
votes
0answers
72 views

Draw lines between points from two layers in QGIS [duplicate]

In QGIS 3.10.4 on Mac, I have two multipoint shapefiles: one is "Start" points, and the other is "To" points. Each layer has "x" and "y" coordinate columns in ...
0
votes
2answers
37 views

Keep only certain points on a layer

I'm using QGIS 3.10.4. I have a vector layer that contains more than 200 cities as multiple points on the layer. The attribute table has one column: city name. My goal is to keep only 10 certain ...
0
votes
0answers
23 views

QGIS create raster from binary point layer

I have a point layer with one of the attributes being binary (yes/no). I want to create a coarse raster which uses the PROPORTION of points within the raster cell which are yes. So not a count but a ...
0
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2answers
172 views

Calculating isochrone for linestring

I have seen APIs and algorithms for calculating isochrones for a single point, e.g. https://openrouteservice.org/dev/#/api-docs/isochrones. Is it possible to calculate the isochrone for a line segment,...
2
votes
0answers
110 views

NNJoin in QGIS does not return any distance

I have two layers, one with ~100,000 points, and another with ~20 polygons. I'm trying to find: a. which polygon a point belongs to b. the distance from the point to that polygon I understand that ...
1
vote
0answers
251 views

Getting the center point of a cluster in Pandas

I have a list of of coordinates that have areas mapped out as follows import pandas as pd import numpy as np import folium from folium import plugins from folium.plugins import HeatMap import pyodbc ...
2
votes
1answer
815 views

Removing duplicate points in GeoPandas using distance and time

I have a list of of coordinates that have areas mapped out on a map user_id id latitude longitude requested_at 84 106 13.0472367 77.5022635 12-10-2020 14:59 84 107 13.0472789 77.5024498 ...
0
votes
1answer
34 views

Extract value to points runs but table won't open

I am running ArcMap 10.4. I have a point file and a raster and I am trying to run extract values to points. It runs successfully, but when I go to open the table I get this error: Error reading OID ...
1
vote
1answer
95 views

Why does the location of the mean of a set of points not coincide with the location of a point I created in QGIS?

So I've made a number points for a set of locations in the Netherlands. Here they are: The location of the purple point was computed by means of the “mean coordinate(s)” tool in QGIS. It represents ...
3
votes
0answers
112 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 ...
1
vote
1answer
435 views

Adding a CSV with GPS coordinates points to Google Earth Engine

I'm trying to add a CSV with Lat/Lon to Google Earth Engine. I looked at the answer below, however, I seem to be making an error somewhere. Adding x,y coordinates from table in Google Earth Engine My ...
1
vote
1answer
179 views

Creating multiple points on Mapbox Isochrone map

Is it possible to create multiple points on an isochrone map in Mapbox? This is the documentation for one of their maps with one point: https://docs.mapbox.com/help/tutorials/get-started-isochrone-api/...
2
votes
2answers
121 views

Nearest point to another point with condition in QGIS 3

I have two different statewide layers of points. One set of points are locations of ballot dropboxes and the other points are residences. Both layers have a column for city. I'm trying to calculate ...
0
votes
0answers
34 views

QGIS 3.12 Toolbox Vector Creation - Create points layer from table corrupting field data

I'm fairly new to this I have imported a table from Excel with coordinates and wanted to convert it to a points layer using the above tool. But it appears to corrupt fields that are real numbers for ...
10
votes
2answers
1k views

What's the difference between QgsPoint, QgsPointXY and QgsGeometry.fromPointXY(QgsPointXY()) in PyQGIS?

I am using PyQGIS. What is the difference between QgsGeometry.fromPointXY(QgsPointXY(x,y)), QgsPointXY(x,y) and QgsPoint(x,y)? When I print these 3 options, I get: print( QgsGeometry.fromPointXY(...
4
votes
1answer
57 views

Selecting a point and auto selecting a polygon in another layer in QGIS 3.14

I'm using QGIS 3.14 Pi and here's my scenario. I have a layer of points and each points contain a numerical value code, let's say it's 123. There may be multiple points with the same code value. In ...
6
votes
2answers
327 views

Snap points to the nearest location on a polygon

I have some PostGIS SQL that generates uniformly distributed point cluster centroids within polygons (loosely based on this tutorial). The number of point cluster centroids generated is based on the ...
2
votes
1answer
50 views

Using Points to Path Plug-in of QGIS

I was able to use the Points to Path plugin to create a simple line with a label in the middle: Here is the very simple text file I used: ID;GEOM "BL2990";"LINESTRING(490206.73 214102....
0
votes
1answer
75 views

QField edition: deplace point object

I would like tu use QField to update localisation of points objects that their fields are already informed. With the editing tool I don't manage to deplace point despite I see several "how to&...
0
votes
0answers
16 views

Intersecting Floating Points within a value range to parcel boundary

I have an NDVI with values of -0.99 to 0.88. The raster is floating points with no attribute table. I also have farms as parcel polygons. Using ArcMap or ArcGIS Pro, how can I intersect only the ...
2
votes
1answer
55 views

Create lines of based on same ID points

I have an excel file containing coordinates of taxi positions which I would like to turn into lines in QGIS. The example data are as follows no trj_id lat lng 1 10162 -6.32044 ...
2
votes
1answer
220 views

Calculating minimum distance between two point layers within polygons in QGIS

I have three vector layers two points and one polygon: Centroids (POINTS FROM) NUTS_ID | CNTR_CODE | NUTS_NAME | id Sorting_plants_2020 (POINTS TO) postcode | name | where | capacity | id ...
0
votes
1answer
81 views

SRID not updating

I have created a point geometry using ST_GeomFromText function in PostGIS and simultaneous set the SRID to 3857. Alter table data.trips_42779 add column geom geometry; UPDATE data.trips_42779 SET ...
1
vote
1answer
32 views

Accessing initial point data inside of point metrics functions with lidR

I am using the R package lidR to do some analysis on a large forestry point cloud. I am trying to write my own point_metrics() function for identifying outliers. How can I access the X, Y, and Z ...
3
votes
3answers
289 views

Find nearest point with the same attribute

I have a points data set of toponyms with several thousand elements. There are a lot of duplicate names that fall in two categories: legit ones, i.e. different places with the same name at several km ...
4
votes
1answer
158 views

Cluster points in each polygon into n parts

I am working on adding 2000 random points to each of 2 polygons and then clustering the points in those polygons into 4 clusters for each polygon. When I apply ST_ClusterKMeans() in PostGIS, it ...
2
votes
1answer
113 views

How to query elevation data from "Digitales Geländemodell (DGM) NRW", maybe using WCS?

I use street network data originating from OpenStreetMap, stored in PostGIS, and want to add corresponding height/elevation data from "Digitales Geländemodell (DGM)", available for North ...
2
votes
0answers
40 views

Getting characteristic high points from DEM

I use QGIS 3.14 and I have a DEM file which I'd like to use to get a point layer with most characteristic high points from that DEM. So every top of the mountain, hill, hillock, low etc should be ...
4
votes
1answer
202 views

Legend symbol is not visable in Layout Composer when styling points with two different attributes

In QGIS 3.10.2 I have a map that I want to show points by colour using one category and size by another. I have tried to follow the instructions here: https://docs.qgis.org/3.10/en/docs/user_manual/...
0
votes
0answers
695 views

DoesNotExist: WorldBorder matching query does not exist

I recently started the geodjango tutorial from the django documentation, but I'm currently stuck because I keep getting a DoesNotExist: WorldBorder matching query does not exist error when I run ...
0
votes
0answers
74 views

Converting points with Easting and Northing to polygons of GB OS Grid references?

Is there a tool or procedure on ArcMap 10.8 (similar to the Tom.bio plugin in QGIS) that allows the conversion of points with easting, northing and grid reference info into polygons of GB OS Grid ...

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