Questions tagged [point]

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

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1answer
33 views

Creating points along line based on line lengths

I have a road network network (polyline shape layer) with multiple line lsegments. Each line segment has different line length as shown in image 1. I am trying to generate points along lines based on ...
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0answers
45 views

What is the difference between those two options of symbology export from QGIS?

What is the difference between those two variants of symbology export. I tried to export a point layer from QGIS to .tab format using both of them. "MapInfo Cartographic" True Type Font .ttf ...
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18 views

Random coordinates need to move little right

I have amcharts map which shows circle on it. I have few records(nearly 200) which do not have locations. These records(circle) I am showing in the map in Sea so that those records clearly will be ...
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2answers
135 views

Calculating distance between points only within same polygon in QGIS

I am using QGIS 3.10 and have shapefile that contains multiple polygons (1615 polygons to be precise). In order to calculate the "compactness" of the shape of each polygon I want to ...
1
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1answer
41 views

How to calculate the azimuth of an offset point/line?

After receiving and answer to this question, I am stuck with another problem. For context, my end goal is to assess windward/lee side of a forested edges (line segments) in respect to a dominant wind ...
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0answers
34 views

Offsetting multiple points

I have a multiline shapefile and a point shapefile. The points are supposed to fall in the center of line breaks but when imported to qgis, the points fall on one end of a line break. Is there a ...
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1answer
13 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 ...
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0answers
17 views

Linking up lines to points within polygon using ArcGIS Pro [closed]

I want to create a line that follows each point in a room. My file is in GDB because I'm using a tool to generate the centerline. I do not have a license to use the official Esri tool.
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1answer
36 views

Understanding “create-grid” output and getting grid points' coordinates

I created the following grid points by using the "create grid" pluggin from the processing toolbox, then "Intersection" to clip from a mask. My idea was to calculate the ...
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0answers
34 views

Finding boundary between two different groups of points

I have a dataset with premises and their location in lat/lon points. Not all the premises are the same. Some premises are offices and other premises are houses. I am trying to find the best way to ...
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0answers
41 views

Concave Hull with points that have to always intersect

I use Concave Hull(Alpha shapes) tool in my set of points in QGIS, it works fine, but I want add some extra points in the beginning, which line of Concave Hull always intersect them. In this image, ...
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2answers
33 views

Detecting if a point is inside a polygon with Python 3 and OGR

I am working in Python 3.7 using ogr to check if a point is inside a polygon. Here I put the code. The result in geom is not compatible with the tuple list data type used by the point_inside function. ...
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1answer
27 views

Subtracting point values from raster maps in QGIS

I have point values (x,y,z) and a raster map with z-values. I would like to subtract the z-values of the raster map from the z-values of the points. The resulting data has to be point data (x of point ...
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3answers
69 views

How to connect points to lines in order using QGIS?

I have a set of points and I want to create lines from them. Points belonging to one line have unique UniqueID to be grouped by. I try to use QGIS' Points to path algorithm. What I don't have is an ...
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0answers
24 views

Visualizing overlay of 6 point data sets using ArcMap

I have a visualization question. Using ArcMap 10.6, I would like to overlay six point datasets in a way that synergies and differences can be quickly seen by people who have no idea about GIS ...
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1answer
35 views

How to create polygon automatically with coordinates [duplicate]

I have some bunch of points in an area and I want to draw connecting lines with the help of points to create a closed polygon. But all these needs manual efforts. Can any one explain to me how to ...
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2answers
29 views

Exporting X,Y coordinates relative to reference point with QGIS

I have a number of points (grey points in attached picture) around a reference point (red point in picture). I need to export X,Y data corresponding to the horizontal and vertical distance in meters ...
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0answers
22 views

How to quantify the similarity of spatial patterns?

I am not a GISer, but I do believe a GIS (more specifically, spatial statistics) algorithm could help with the task I am carrying on. If posting a question that has already been posted (by me) on ...
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0answers
21 views

Filtering duplicate records using space and time overlap

I have a dataset consisting of about 23,000 fire incidents obtained from years of fire brigade reports. The incidents have a lat, lon, and timestamp. The problem is that in the case when two (or more) ...
2
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1answer
69 views

Calculate 500m south of coordinate in PostGIS

I have a point layer punkte_test. From that I want to make a line: first point of the line is the point A from the point layer itself. Second point of the line shall be y(B) = y(A) - 500 m . How can I ...
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2answers
37 views

Populate Elevation Data in GPX using FME

New to FME, and I have now spent more time than I would like to admit on this and need some pointers. I have a GPX file that was made from a Shapefile. It has no elevation data. I have the Terrain50 ...
3
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1answer
92 views

Mapping polygons into lines and projecting lines on road network

I have a layer with polygons that describe road damages. I have then another layer with road network lines. The layers are shown in the picture. I need to project the polygons as lines to the road ...
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0answers
30 views

Plotting xy data in ArcMap

I have a .csv containing the name, longitude, and latitude in the first, second and third column, respectively. Longitude and latitude are in decimal degrees in WGS 84. However, if I try to plot these ...
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0answers
33 views

Finding a pour point in a polygon?

I have a polygon shapefile (created by someone else) that is a bunch of little watersheds. Unfortunately, it doesn't include any coordinates in the attribute table for the lat/long of the pour point ...
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1answer
35 views

Data of attribute table is not showing on ArcMap

I have downloaded a point shapefile and when I can add this in my ArcMap 10.4. But the problem is when I try to open the attribute table it says this message and end up with bank rows. It shows the ...
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0answers
63 views

ERROR 010555: Internal error in Sample: %s. Failed to execute (ExtractMultiValuesToPoints)

I'm trying to run the following code to extract different types of climate data for various points: # Import system modules import arcpy from arcpy import env from arcpy.sa import * # Set environment ...
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0answers
16 views

Extract into a dataframe the number of points in each buffer, in a set of concentric equi-distance buffers around a single point

I have the locations of the patients using an healthcare facility, and wants to extract the number of patients living at given distances from the hospital. I generated buffers at 500m increments ...
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0answers
29 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 (...
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0answers
26 views

Python code error invalid geojson

I have a javascript code that worked well , but when convert to python it's doesn't work and raise invalid geojson error . my code in java script is : var point = ee.Geometry.Point([52.55845586988192,...
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1answer
100 views

Categorising point layer twice by size and form in QGIS

I have data points from a CSV-file that I opened in QGIS. The points illustrate different power plants of solar, wind, geothermal, coal, oil, etc with different capacities within each class. I already ...
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1answer
33 views

Display points from CSV table (feature collection) in Google Earth Engine

Unfortunately, I cannot display the point data I uploaded as csv file. I specified latitude and longitude, the rest is unknown so I kept it at default. Can somebody help? Link to asset
3
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1answer
25 views

Delete points on the map to remain only one for each plane in OpenLayers

I'm trying to put on the map the route of an ads-b plane, I've managed this so far ... Poblema is as follows puts all the points since I started to intercept him until the end what is not correct ...
2
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1answer
39 views

Representing stationary elements in flow map

I have been trying to make flow maps to show social relationships between people geographically based on baptismal records. I have successfully made maps using https://anitagraser.com/2019/05/04/flow-...
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3answers
48 views

Convert points layer into a circular polygon on R

As the title says, I am supposed to convert a point layer similar to this one (it represents the perimeter of a tree at a certain height, and it's a sf that I called "points" in R): I would ...
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0answers
30 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 ...
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3answers
146 views

Calculating distance of all points to central point using QGIS

I'm using QGIS and the points on this map represent different periods of the day in which coyotes were observed. I am trying to figure out if coyotes are active at different times of the day based on ...
3
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0answers
33 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 ...
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1answer
40 views

Shape or point pattern [closed]

Is it possible to draw one shapeline or one point and repeat it in a specific direction with a specific distance for a specific amount? Like the pattern function in AutoCAD? I'm working with QGIS. An ...
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0answers
67 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 ...
1
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1answer
47 views

Shapefile points, individual editing

I am very new to QGIS and have run into a problem dealing with shapefiles. Recently, I went into the field with an app for smartphones called 'SW Maps' that I used to create some basic layers for ...
3
votes
1answer
70 views

QGIS 3 - default marker symbology

Working with QGIS3 (QGIS 3.2.3) Is it possible to change what the default point symbol is when adding a new point layer to a new project? Context: I have to work with massive point layers very often. ...
4
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2answers
92 views

Polygon to Point Grid with the same information

I want a grid of points (with defined spaces between them) inside a Polygon. All the points should contain the same information as the original Polygon did. I tried the centroid (only one point -> ...
2
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0answers
35 views

Missing connections between line and points

I have two shapefiles line layer (Blue color) points layer which represents houses (Green color)) I am trying to connect line with points (houses). For that, I used closestSegmentWithContext as ...
5
votes
1answer
91 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
30 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 ...
9
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2answers
249 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 "...
3
votes
1answer
85 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
94 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: "...
3
votes
1answer
37 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
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1answer
37 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 ...

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