Questions tagged [point]

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

310 questions with no upvoted or accepted answers
Filter by
Sorted by
Tagged with
5
votes
0answers
71 views

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 ...
5
votes
0answers
474 views

What's the fastest way to convert large csvs to point shapefile

I'm working in QGIS, and my current method to change csvs to shapefiles is to import them to QGIS, right click and save as shapefile. For large CSVs (over 100 million rows) it can take quite some time ...
4
votes
0answers
787 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 ...
4
votes
0answers
197 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.
4
votes
0answers
110 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-...
3
votes
0answers
29 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 ...
3
votes
1answer
144 views

Transferring attributes to neighbors in point layer using QGIS

My goal is to create a wind map for an area about 300 km² in QGIS. For this i have the data of only one weather station. The idea is to estimate the wind speed by the roughness lenght and the ...
3
votes
3answers
121 views

Finding all possible adjacent/closest geometrical points from a given point

So, I have a dataframe like this, import numpy as np import pandas as pd import descartes from shapely.geometry import Point, Polygon import geopandas as gpd import matplotlib.pyplot as plt df = pd....
3
votes
0answers
35 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 ...
3
votes
2answers
142 views

Inserting new points to desired distance from the existing ones?

I am using QGIS to map the existing buildings on the map, we want to build more houses but on a distance not less than 5 km from the existing ones, it means that a place where there is no building in ...
3
votes
0answers
235 views

How to create equidistant points along lines (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 ...
3
votes
0answers
119 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 ...
3
votes
0answers
264 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 ...
3
votes
0answers
457 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 ...
3
votes
0answers
166 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 ...
3
votes
0answers
840 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....
3
votes
0answers
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 ...
3
votes
0answers
264 views

Geotagging photos with Point Shape via Time Stamp

I have waypoints which I marked with a GPS device - unfortunately no track/route. And I have photos which I took at the same day. Now I want to interpolate the points to line and use this line to ...
3
votes
0answers
595 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
3
votes
0answers
517 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 ...
3
votes
0answers
890 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. ...
3
votes
0answers
797 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 ...
3
votes
1answer
610 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. ...
3
votes
2answers
227 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 ...
3
votes
1answer
265 views

Join .csv file and .shp of georeferenced points

I have georeferenced a map and saved a selection of some points on the map. These points are cities of departure and arrival and I want to join the .shp with a and excel .csv with the information of ...
2
votes
0answers
28 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 (...
2
votes
0answers
29 views

Generate Radio Channel Number Keeping 2km Buffer

I have point data and each point has a serial number (as shown in the screenshot) Each of my points is like a wireless access point and cannot be on the same radio channel as another wireless access ...
2
votes
0answers
63 views

When I edit a point, press save, it says saved, but really doesn't

I'm a newbie in GIS. The problems starts when I import some points gather from QField. I was improving my fields while learning, to have drop down options in some features, but now I can't save my ...
2
votes
0answers
32 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 ...
2
votes
0answers
42 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 ...
2
votes
0answers
39 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 ...
2
votes
0answers
33 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 ...
2
votes
0answers
51 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 ...
2
votes
1answer
93 views

Find all closest points to unique point in PostGIS

I have two tables valid_collisions (POINT) and intrct_pts (POINT) I want to create a new table using a nearest-neighbor type of query to find aggregate values from my valid_collisions. In essence I am ...
2
votes
0answers
24 views

Randomly filtering points in unevenly distributed point dataset?

I have a vegetation plots dataset which has unduly high concentrations of plots in certain parts of the dataset. I want to even out the concentrations of points so that there is a more even ...
2
votes
0answers
21 views

Rasterize will output 0 as NODATA (QGIS)

I have a data range which includes 0 ex +3 to -4. I would like the rasterize to include my 0 data (create a pixel) and just exclude the NODATA (where there is no points)
2
votes
0answers
147 views

Not all points overlain on raster map are showing up with R

Using R, I loaded a raster file (.tif) and overlaid points on the map. I have 46 points but only about half of them appear on the map. I can't figure out why other points are not showing up. Here are ...
2
votes
0answers
49 views

Grouping points by attributes from field with possibly many values

I have a shapefile "cities" with one unique city_id for each city (geometry polygon, although not relevant here) : city_name ; city_id New-York ; 0001 Paris ; 0002 London ; 0003 And a ...
2
votes
0answers
167 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 ...
2
votes
0answers
37 views

One polygon layer for an area with different projects in the same layer?

I was wondering if it is possible (maybe not ?) to make a structure so that I can have diffrient information (projekts) over the same area/point in the same layer. This would be for an overview of the ...
2
votes
0answers
39 views

Variable buffer maximizing mean raster

I was wondering if it exists a way to create variable buffers where the radius is given by a process of maximization of the mean value of a raster. I have a point vector data and I would like to ...
2
votes
0answers
45 views

Plotting point data from one dataset on polygon

I have a point dataset with information on: date, number of beneficiaries, and type of assistance. I want to plot/map this info on a country polygon. I tried joining attributes by location, but that ...
2
votes
0answers
32 views

Snap points to nearest line - however limit snapping to polygon the point sits within

I am trying to snap a series of points relative to the nearest line (which i know can be achieved via "Snap geometries to layer", however, i want to restrict snapping to the polygons the points sit ...
2
votes
0answers
41 views

Get position/rotation of free labels in QGIS

I want to export the position and rotation of labels with placement "Free" as I need them in Mapbox, which has inferior label placement compared to QGIS. I've tried with various polygon-to-point ...
2
votes
0answers
272 views

Shortest path between start and end point with many other points in between

Sorry if double post, but I haven't found this specific problem in the search function. I want qgis to show me the shortest path (direct) between many points with each point only is hit once. There is ...
2
votes
0answers
108 views

Creating points with linear referencing

I have traffic data that shows tracks that have start and end times (in YYYYMMDD-HHMMSS format) and the speed (m/s) the vehicle was moving. From that I've calculated total traveled distance (m) and ...
2
votes
0answers
40 views

Creating networks and regions KML in R

I have >500 very large KMLs that contains only point data and a reference to a .png pop-up Each KML looks like this <kml xmlns:xsd="http://schemas.opengis.net/kml/2.2.0/ogckml22.xsd" xmlns:xmlns="...
2
votes
0answers
141 views

Point displacement between map (Cesium 3D) and raster (numpy array)

It is better to show than tell: On this image, the layer below the colorful shape is a trivial heat map in raster format. The colorful shape is the product of the skimage.graph.MCP_Geometric method. ...
2
votes
0answers
275 views

Qchainage: python error with QGIS 3.2

I get a following python error while working with QChainage-tool in QGIS 3.2. Because of that (assumably) the OK-button is also greyed out. My goal is to retrieve start and end points of line features....
2
votes
0answers
45 views

Attributing Points based on Direction

Using QGIS 2.18.16 I am looking at "renaming" or changing the attributes of points to a unique attribute based on the direction of the points. For example A1, A2, A3, then next row starts over as B1, ...

1
2 3 4 5
7