Questions tagged [point]

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

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37 views

Writing to postgreSQL database

I'm trying to create a point geometry from a lat, lon pair read from a json, and then write to a database table in postgreSQL that has already been created with the appropriate variable types. I don't ...
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18 views

OpenLayers point ID (set, get)? [closed]

function addInteractions() { draw = new ol.interaction.Draw({ source: source, type: typeSelect.value }); /* 포인트에 아이디 부여 START*/ draw.on('drawend', function (evt) { ...
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35 views

Creating a points layer from a CSV file with distances along a line, based upon a known vector in QGIS?

I have transect data with know start and end lat/long and length for each transect, which I have made into a vector shapefile in QGIS. I want to add points for each sighting along the transects, which ...
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1answer
35 views

QGIS Add Polygon name as field to all points inside Polygon

I have a single polygon layer with multiple blocks features named "block 1" to "block 40". Within these polygons there is a single layer with multiple points. I want these points to get the block name ...
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0answers
36 views

Finding the distance between two points along the given shapefile? [closed]

I have a shape file(a line A to B). I need to find the distance(d) between two points (P) and (Q) along the shapefile as drawn in the image. This example shows how to do that in PostGIS. I want to ...
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1answer
60 views

Interpolation for unevenly spaced data points

I am currently having some trouble finding a good interpolation technique for unevenly distributed spatial data points. Let's give a quick example : I have a 1000 points dataset. As several surveys ...
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2answers
88 views

Draw lines between points

I am doing a research project for which I need to find an effective way for drawing lines between a number of points along a square. I need there to be a line between every point on the square in ...
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15 views

When carrying out spatial point pattern analysis on my point files I get an error for standard distance

How to fix an error with standard distance in spatial point pattern analysis. When performing spatial point pattern analysis QGIS 3.4 is only carrying out the mean point calculation correctly and ...
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2answers
35 views

R - Find “n” closest points to each point in SpatialPointsDataFrame

I am working with a dataset that is similar to this one: library(raster) library(sf) # Define CRSs crs.latlon <- "+init=epsg:4326" crs.sirgas <- "+init=epsg:5880" # define edges in somewhere ...
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27 views

Model or script to calculate distance from each point in a multipoint file to the center of a matching polygon in ArcGIS Pro

I am working in ArcGIS Pro. I have a series of multipoint features that represent release locations for individual animals. I have a series of these, for multiple study sites. At each study site - I ...
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26 views

Finding close road centerlines to given trajectory

I am working on trajectory prediction model for autonomous vehicle using previous trajectory and road information. I have lane centerlines. I need to filter them. (Removing unnecessary lanes). I ...
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1answer
74 views

Linear referencing to calculate maximum distance between points by group along line (river system) using ArcGIS Pro

I am using ArcGIS Pro. I have a series of points representing animal locations that were tracked in a small stream. I would like to get the distance between the most upstream and downstream location ...
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1answer
48 views

Random points within a grid cell on a line

I'm trying to create random points on a line within a grid cell. I have a river layer within a state boundary. I have placed a grid over the state boundary. I would like to assign 5 random points ...
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1answer
41 views

Join attributes by location fails to join to selected features

There's an issue when I perform the "join attributes by location" tool. I have a simple polygon layer representing urban areas. I also have a point layer with human population estimates. My aim is to ...
4
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1answer
87 views

arcpy.SelectByAttribute 'Parameters are not valid' error

I am trying to run a python script to select 5 random points in an attribute table and to loop through every 100 points to do this. When I run the function SelectRandomByCOunt within a python shell, ...
1
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1answer
22 views

Attach features of lines to points

I am trying to calculate the cost of network to homes. In the image i have cable (brown line) between utility boxes(pink/blue points) and home feed (black dash) to the home. I know the cost for each ...
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0answers
18 views

Opening hyperlinks in a new tab from GeoJSON points when the link to the website is embeded in GeoJSON? [closed]

In the code below the point links are embeded in GeoJSON object places_geojson. How could we make the link to be opened in a new tab? I believe that this functionality need to be added in the ...
1
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1answer
24 views

Put the start and the end name of a point object into the layer of the line object that connects them? [duplicate]

I am new to QGIS. I am given two layers with point objects. In their attribute table each of this objects has a code (name) given previously to it by someone else. Then I import the lines from AutoCAD ...
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2answers
41 views

Removing both sets of duplicate points

I'm trying to create points on the edges of polygons. So far I have converted the polygons to lines, then exploded the lines, then ran the following code which plots a point in the middle of the ...
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0answers
32 views

Difference between grid and its centroid

Recently I was download GPCC gridded precipitation data. I plot them on Matlab and it gives me pixels. then I tried to plot them on the ArcMap and saw there are lots of points instead of pixels. What ...
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23 views

Assigning elevation to point shapefile based on point file using ArcGIS Desktop

Goal: Extract elevation data (Data B) based on given point file locations (Data A). Current problem: I have several sets of xyz data for large areas with a resolution of 1m. I converted those to ...
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62 views

Define custom projection in QGIS from some control points

I have six control points in a local mine grid which I want to use to define a custom projection in QGIS. The reference points are in GDA94 / MGA zone 50 (EPSG:28350) (https://spatialreference.org/ref/...
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2answers
74 views

Plotting point every x m2 in polygon using QGIS plugin

I'm trying to work out whether its possible to plot a point every so often within a polygon. For example, if I have a polygon thats 200x200m, perhaps I could plot a point at every meter squared ...
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0answers
18 views

Upload waypoints to OpenStreetMap

I want to upload waypoints recorded in the maps.me app onto openstreetmap.org for further editing. Already tried: Export from maps.me to .kml then conversion to .gpx with QGIS (second try with ...
1
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1answer
36 views

Delete overlapping points between two shapefiles QGIS

I have a point shapefile of all human settlements in South Africa (ranging from tiny hamlets to major cities). In another shapefile, I have point features as well, representing settlements located ...
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42 views

Adding break/vertex on a polyline from points

I have a polyline which consists of just one geometry. I have points which are evenly spaced (25m). How would I add these point vertices to the line so that the points will create one line segment/...
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0answers
14 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)
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29 views

Rasterize right method for true value of point grid?

Is rasterize an interpolation or does it just burn in the "true" value of the point? I have a grided data that is evenly spaced and dense. I would like to just have a raster with the "real" value of ...
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0answers
36 views

Is points to route still available in QGIS 3.4?

I need to do the same thing as the post here as I need to create polylines based on given points with sequence attribute, and networks, but I cannot find the tool in toolbox: my point data and ...
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0answers
29 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 ...
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0answers
36 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 ...
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0answers
39 views

Calculate road distances between points in QGIS 3.4?

I would like to calculate road distances between a series of points. I don't have any road network layer, I need to rely on OpenStreetMap. What is the best plugin available right now? And how ...
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0answers
46 views

Points group automatically when adding delimited text layer [duplicate]

I'm using QGIS 3.10. I am working with an Excel table with records having coordinates. I'm adding a delimited text layer, that is shown as points. However, records with the same coordinates are shown ...
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0answers
37 views

Why is my Nearest neighbour outputting higher value in a equally spaced grid?

So I got a point layer which is equally spaced 0,5x0,5. When I run the nearest neighbour and accounting for the extent so that the raster cells are centered, I get this result. I got maybe five areas ...
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0answers
34 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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2answers
69 views

Unfinished Layer with QGIS Contour Plugin

I am using QGIS 3.4.13 Madeira on Windows 10 I have an issue with the QGIS Contour Plugin. I have two point layers, they contain about 45'000 points in the exact same locations. The only differences ...
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0answers
15 views

Rescaling point distance values

I have a single line feature that I have converted into points that also contains an attribute field with each point distance value along the line. I’ve edited that line (e.g. made it longer, changed ...
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2answers
53 views

Converting from SHP into TXT file using PyQGIS [duplicate]

I'm working with many shp file point format with geometry attributes like this: But I need convert it into such format in textfile like below: Are there any ways to arrange my shapefiles format into ...
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3answers
213 views

Creating point at line end using QGIS

For an examination of a local power grid, I need to mark the transformation stations (substation) by simply create a point for each station. What I want to do is that QGIS creates a point at the end ...
2
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1answer
31 views

If I selected (highlight) a feature or points would I be able to color that feature as as it is being highlighted?

The points on purple and lightgreen area I want to maintain them reds. The points outside that I want to color them yellow not just the highlighted ones. How can I do that?
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0answers
22 views

Combining orthophoto and DEM to export xyz-CSV

I have a georeferenced orthophoto and a DEM as tiff-file. For my further workflow I want to export x,y,z (x,y from the orthophoto and z from the DEM). I already managed to create a point layer and ...
1
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1answer
61 views

Rendering 3D points in QGIS

I am using 3D map view in QGIS 3.4 and I have point data. On layer properties I have enabled 3D Renderer but the billboard rendering to point option does not seem to be there. Does anyone know where ...
1
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1answer
42 views

Adding information to points [closed]

New to QGIS here. I'm trying to figure out how to add information to set points. I'm trying to use them as leads, so I can put lead name, address, phone number, whether they've been talked to, etc. ...
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0answers
27 views

How to calculate the number of pixels in each class using QGIS?

I have a raster file with slope values. These slope values are divided among several classes like A,B,C. Then there's a vector map with points. For an example a point can belong to class A of slope ...
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1answer
23 views

Using weighted species distribution data to create a scored grid map

I'm currently working on a project within ArcGIS Pro, I have a large dataset (>40000 points) comprising a list of ~120 indicator species as point data that are assigned numerical scores (1-10) based ...
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1answer
31 views

Select evenly distirbuted points of unevenly distributed set

I have a task which looks pretty nontrivial yet pretty standard. Let's say, I have a set of points, unevenly distributed on the map (i.e. in some regions there are a lot of points, while in the ...
2
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1answer
39 views

Split linestring by selecting two points in OpenLayers?

I have a project where people can drag and drop a gpx file. This results in a multilinestring. People should be able to take a piece of their route and submit that. I was thinking of letting the user ...
1
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1answer
35 views

Output file from Point Sampling Tool plugin returns data but no sample ID using QGIS

I have sampling points in QGIS which all have a unique ID, and I'm trying to collect various geographic and climate data for those points from a variety of sources. Although the source raster data ...
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0answers
32 views

Moving points to nearest raster cell with values in ArcMap [closed]

I have two types of data, one that is a point vector (occurrences), and one that is a raster (environment). The environmental data has both cells with numerical values or NA. Both of the types of data ...
1
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2answers
122 views

Calculate sequential numbers along line

I am looking for a way to calculate sequential numbers in points feature along line. I've got polygon 1 feature intersected with other layer of polygons. Then I extract points from the intersection, ...

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