Geographic Information Systems

Questions tagged [point]

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

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34 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 ...
3
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2answers
62 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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1answer
34 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
32 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 ...
32
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3answers
59k views

Draw lines from points in QGIS

I have a point layer and need to draw a line passing through or in the vicinity of the points (up to 0.5m ditance between the point and the line). The nodes of the line will recieve the attributes of ...
3
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1answer
39 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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0answers
7 views

How to carry out radial basis function (RBF) interpolation by package geosptdb in R?

I want to run RBF interpolation for my dataset using function rbfST, package geosptdb. When the given rbfST example is executed it runs without any error. library(geosptdb) data(croatiadb) data(...
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0answers
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 ...
1
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1answer
20 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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0answers
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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0answers
23 views

Manhattan distance between a point and a line [closed]

I would like to know if anyone knows a code in python to implement the minimum manhattan distance between a point and a line.
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0answers
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 ...
4
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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 ...
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 ...
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 ...
1
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1answer
40 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 ...
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0answers
53 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/...
4
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1answer
85 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
67 views

Counting unique species in polygon layer and buffer

Within QGIS I'm working on a data set that contains species at 100m resolution (eg OSGB 6 fig) and 10m or finer resolution (eg OSGB 8 or 10fig). The objective is to count the number of unique species ...
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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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 ...
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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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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
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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22 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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2answers
14k views

How can I group Points to make polygon via Python

I have an array of coordinates Point= [lat,long] ListPoint= [[38.203655,-76.113281],[38.10,-76.12],..] I wanna make a polygon that contains all these points ? There is a project developed by ...
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2answers
2k views

Creating point at highest value in raster using ArcGIS Desktop

I am using ArcGIS Desktop 10.1. I am trying to find the location of the highest value pixel in my Direct Solar Radiation Raster. I can see the extent of the data in my raster but don't know where ...
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1answer
405 views

Point in Polygon Add Polygon Value

I have a file of points with Easting and Northing. I have a 1km grid table. Both have the same projection and I can see in a map where the points are layered over the grid squares. What I need is to ...
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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 ...
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0answers
17 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 ...
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0answers
28 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 ...
3
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1answer
252 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 ...
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0answers
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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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 ...
1
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1answer
57 views

Calculating number of polygons needing to be crossed?

I have a bunch of polygons (parcels, green areas) and a bunch of wells (point, black triangles). How do I calculate the number of parcels I need to cross to get to the closest well to each parcel? ...
1
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1answer
41 views

Joining point layer with line layer using coordinates

I am using QGIS 3.14, and I want to represent a road network. I had a polyline layer (3257 entities) as a background. For each one I have calculated x_start, y_start, x_end, y_end coordinates, length ...
1
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1answer
43 views

Using spatial points to extract values from large raster in R

I am working with location data for 22 different individuals (id). The data contains an id column, and coordinates (UTM_x and UTM_y). For all individuals combined, there is a total of 991,099 ...
2
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0answers
13 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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0answers
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 ...
0
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1answer
52 views

Apply symbology based on an algorithm (ArcGIS)

Been battling this problem for a long time now, so hoping someone here can shed light on a possible solution. The problem is that I have 100 points and I want to apply a color palette to the points so ...
0
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1answer
198 views

Unable to save point features to QGIS on MySQL database

I created a table with point geometry in MySQL. Subsequently added a vector layer from MySQL table. The table could be accessed from QGIS. However on pressing the add button the system threw warning ...
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0answers
34 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
37 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 ...
3
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2answers
68 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
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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2answers
486 views

Add points on zoom and remove points when zooming out

Problem I would like to add points/shelterIcons when zooming to level 12 or more and remove them again when zooming out. If all the points were defined as a layer I could add/remove them with the ...
1
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1answer
29 views

Can QGIS be used to calculate the up-slopes (total area draining to a specified point) of multiple separate points simultaneously?

I am trying to calculate the area draining to a point of 240 separate points using QGIS. At the moment I'm using the Saga - Upslope Area algorithm to individually work this out for each of the 240 ...
2
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2answers
71 views

Routing consecutive set of points on network [closed]

I need to generate routes based on a consecutive set of points exactly as given in this routing script by Anita Graser. As given in this image, I have a layer of consecutive points as well as a ...
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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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