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Questions tagged [point]

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

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14 views

Point style with Python MapScript does not work

Software details: CentOS 7, Python 3.6, MapServer v 7.2.1 is compiled from source. I use Python MapScript to build WMS, it works well for styling Lines and Polygons, but not for Points. For example,...
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18 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 ...
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2answers
2k views

TIN file to a POINT file

I have some bathymetry data in TIN format; I am able to open this in arcmap and view the terrain. However I need to use this data within a simulation framework called Delft3D, which needs the ...
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0answers
10 views

Calculate centroid of points (group point) [duplicate]

I am new to PostGIS and I need to calculate the centroid of a group of points that have a cluster identifier (id_cluster). I need to get the latitude and longitude of the cluster centroid.
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3answers
7k views

Adding “noise” to overlapping X,Y coordinates so no longer in EXACT same place?

I have a series of points representing animal observations. Many of them overlap, having the exact same coordinates, and this is causing me trouble when I want to run some analytical tools which ...
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0answers
46 views

Linear extrapolation of points using QGIS

I am currently working with hurricane data from NOAA’s IBTrACS. Each gathered data point is separated by three hours. I am trying to add points on the path for every hour. Since storms are nonlinear ...
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0answers
33 views

Determining which interpolation method suits a bathymetry (river) with gridded 0,25x0,25m with no extreme terrain difference in Z [on hold]

The important thing is that the Z value doesn't go below the value of the xyz point cloud. It wouldn't be good if a ex a rock was half a meter below compare too the real height. I used nearest ...
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0answers
11 views

How do I determent which interpolation method that suits a bathymetry (river) with gridded 0,25x0,25m with no extrem terrain difference in Z [duplicate]

Newbie here. The important thing is that the Z value doesn't go below the value of the xyz point cloud. It wouldn't be good if a ex a rock was half a meter below compare too the real hight. I used ...
2
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1answer
27 views

Point to every other point as dataframe in R

I understand there are several tools out there that can help me accomplish my goal, but I think I'm running into more of a conceptual roadblock. I've tried to implement a fully reproducible example in ...
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0answers
15 views

Bread crumbs for AVL ( Automatic vehicle location) Map

Working in ArcPro (New to it) and bringing in point data from our AVL software to a feature layer. I am trying to figure out a good way to create a breadcrumb track as well as last point for each ...
2
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1answer
36 views

Using R to extract point data for LAS file and maintain all the point data

I am trying to extract several point values for a set of lidar data. I am starting with the DEM before I jump into the other more complicated values in my raster stack. Here is my code: library (...
3
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1answer
53 views

Subset point vector based on attribute classification in underlying raster

I have two datasets: A raster file containing per-pixel vegetation classifications across Australia. The file is described to have projection of EPSG:3577 https://epsg.io/3577. All additional meta ...
3
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2answers
51 views

Find 3 closest points in relation to another point

Using QGIS, I have two shapefiles: points representing enterprises (about 50k) points representing towers (about 300) For each enterprise, I need to figure out the three closest towers and their ...
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0answers
19 views

Draw (extend) a straight line from points

Is there any existent tool or workflow to generate a straight line in ArcMap? I have a lot of point that represent plant counting (one point per plant) and I need to generate e line that represents ...
3
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3answers
752 views

QGIS Atlas generation for multiple map extents?

I'm trying to create 5 maps in composer showing the same layer features but different extents of a map (attached an image to give everyone an example). I've opted to use atlas to save me manually ...
4
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1answer
106 views

Converting large amount of points to polygons with QGIS

I have a large point dataset of about 4 million points in QGIS. I would like to convert these to polygons by connecting the outer edges and hence create ribbon-like X shapes (see image below). I ...
2
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1answer
21 views

Combining Rotation and Graduated Colors in ArcMap

Is there a way to rotate the symbols of a point feature layer (with a given rotation out of the attribute table) that is displayed as graduated color layer? I can see the option in the graduated ...
8
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2answers
1k views

Shortest path from points in one layer to points in another layer via roads in QGIS

I'm looking for a way to calculate the shortest path from addresses to subway stations via a network of roads. I have the Road Graph plugin, however, the addresses and subway stations are point ...
3
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1answer
516 views

Getting value of pixel and its 8 surrounding pixels from points using QGIS

I have a point Shapefile layer and a land cover raster layer. For each point, I want to get the value (land cover) of the pixel it falls into and also of the 8 surrounding pixel. Is there a tool in ...
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2answers
1k views

Drawing points around circle in QGIS

I've got a square origin-destination matrix with 23 elements, I would like to draw each one of these elements as a point around a circle, to achieve a result like the following: Can you suggest me a ...
1
vote
1answer
41 views

Running convert Raster to Point Features in arcpy returns an error

I'm trying to convert a bunch of rasters to point features to further build a regression of those. Is it possible to do that without a conversion using arcpy? If not what am I doing wrong converting? ...
0
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1answer
31 views

QGIS is not showing/rendering points that are present in MySQL server

I have a MySQL database in which there are auto generated points almost 1000 created via Laravel (PHP framework) it has a very simple schema as shown below. I just want to visualise them on an ...
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1answer
42 views

Drawing a feature on my map

This is my code but it doesn't show anything... var vectorSource = new ol.source.Vector({}); var map = new ol.Map({ layers: [ new ol.layer.Tile({ source: new ol.source.OSM() ...
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2answers
33 views

Selecting from Point column in PostgreSQL?

How to select from Point column data type(native) in PostgreSQL? select a.* from indsolv.address As a where a.location = '93.2321, 21.0321' Getting error for the above query! ERROR: operator does ...
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1answer
29 views

Coordinate Point Drops on timeseries in QGIS [closed]

I have timestamp data for every minute of a day (1140)for multiple objects by id, with a corresponding lat long. I want to get the time in which an id disappears off the map or off the csv. What would ...
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0answers
32 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 ...
3
votes
1answer
9k views

How to add marker dynamically when clicked on map using OpenLayers 3?

I'm trying to add point (marker) on map click with custom style using OpenLayers 3. I tried this code, but nothing happens when user click on the map: var map = new ol.Map({ layers: [ ...
1
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2answers
32 views

Deleting point data from ArcGIS Online

I am creating point data for Drainage using ArcGIS online. But I accidentally created a few points that I do not require. Is there any way that I can delete the record from the attribute table in ...
2
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0answers
39 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 ...
1
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1answer
204 views

Extracting values from multiple raster dataset at location point in one single dbf using ArcGIS Desktop

Suppose I have 250 raster and my only concern is just a single point. The raster is arranged by ascending date. So if I extract a point value based on the order into one single file then I can graph ...
1
vote
1answer
83 views

Using Click locations to determine azimuth in QGIS 3

I am using QGIS 3 64bit. While adding points to a shapefile (layer), what expression captures the insertion point coordinates of a point feature to use as a start point for an azimuth determination ...
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1answer
47 views

QGIS - Duplicate Labels

I have a dataset of points with data at different depths: e.g as a csv file as follows: "ID","DEPTH","VALUE" "BH01","0.5","10" "BH01","2.0","50" There will be multiple points with the ...
2
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2answers
62 views

Connecting dots with lines, thickness depended on attribute value

I am having a point data of in total of 13 destinations within a region. The goal is to present how many people who were in destination "A" also visited the other 12 destinations. I have this data ...
2
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1answer
64 views

Moving point A to point B with attributes using QGIS

I have an A layer containing points with a XX attribute. I would like to move (on points A) the points of a layer B with the same XX attribute as A. There is no notion of distances (from a few cm to ...
1
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0answers
48 views

Comparing Random Point generators of ArcMap and QGIS

I have just compared the random point generator functions of QGIS and ArcGIS and had confusing results. My setup was: Create random points within an existing extent with a minimum dist between points ...
1
vote
1answer
75 views

ArcGIS Random Point generator producing same points every iteration

I am generating random points to sample within a stratum. Data Management Tools > Feature Class > Generate Random Points This works just fine, except that I noticed the points I generated for ...
3
votes
2answers
1k views

Calculating drive time in QGIS

I have more than 3000 points that spread in in a very big area. I need to find all the points (blue) that are in distance of 50 minute drive time, from the stores (green stars). I want to calculate it ...
2
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0answers
20 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 ...
0
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0answers
32 views

Showing Arrow connection relation between Polygon centroids to points in ArcGIS Desktop

I am looking for a similar solution to Making arrow from polygon centroid to point using QGIS but using ArcGIS Desktop. I have a polygon and a point shapefile. The polygon area drains to the point ...
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0answers
52 views

Importing cvs file with coordinates into QGIS [duplicate]

I got a problem. I got some coordinates in Excel. They are written with comma 14459091,1010 ex. When I try to import them as csv-file into QGIS, it will only create a table and no points. When I look ...
1
vote
1answer
99 views

Creating a “catchment area” geometry from place points in QGIS

I have data from Geonames.org on the location of population centres, provided in the format of Center Name, Latitude and Longitude. Only one latitude and longitude point is provided for each ...
3
votes
1answer
50 views

Distance between points along line

How do I determine the distance between points to the neighbor point that connected via the line(road)? In QGIS 3.8.3 I have tried v.distance and v.net.distance but they do not help. The line(roads) ...
1
vote
1answer
49 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 ...
0
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1answer
27 views

Displaying point data that is close together using ArcGIS Pro [closed]

I am using ArcGIS Pro to display point data on a map. Each of these points need to be displayed with clearly visible symbols. However, some of them sit very close together, and when displaying on a ...
4
votes
3answers
5k views

How to find the concave hull for a cloud of points in 3D space?

The existing algorithm for convex hull is not able to capture the feature for a set of 3D points. Moreover, I found few mathematic tools have this function to obtain the concave hull and their ...
1
vote
1answer
541 views

Creating point symbology in SLD file

I would like to create a style file for a layer in Geoserver. I have point geometries and the SLD cookbook does give nice examples for the simple ways to create your symbology. However, I would like ...
1
vote
1answer
55 views

How do I find the area of a polygon covered by points of a defined size? (QGIS 2.18)

I'm using point vectors to portray 264 marked trees in a stand using the 'Random points inside polygons' tool (it doesn't matter where they are). Each point is 4.5m across (the average single tree ...
2
votes
1answer
32 views

Selecting random points from specific attribute in yield map using QGIS

I am using QGIS. A farmer has sent me the shapefiles from his John Deere combine. They were three shapefiles that I have merged into one layer. The shapefile is from one field with a treated ...
8
votes
3answers
2k views

Converting point layer to raster grid that shows frequency of points per cell uisng QGIS

I have a point layer that shows the distribution of a species. Is it possible in QGIS to convert this point layer to a raster grid in which the value of each cell corresponds with the amount of ...
1
vote
0answers
35 views

Separating 50 duplicate points by limit in buffer zone using QGIS

I am building a customer database in QGIS. I get GPS coordinates for customers from my staff. Then I convert those GPS coordinates into shapefile points in QGIS. I get a lot of duplicate points. I am ...