Questions tagged [point]

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

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36 views

Converting multiple points to multiple polygons - ArcGIS Desktop 10.6.1

How can I convert multiple points to multiple (tiny polygons)? I need to execute a merge function and I need the points to be polygons so that the toolbox can do its job and join multiple polygon ...
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1answer
31 views

Find duplicate point geometries in a shapefile [on hold]

How to find a duplicate point geometries in point shapefile (around one lakh geometries) using Python OGR/GDAL
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1answer
42 views

Creating random points from attribute field

In QGIS 3.6, I wanted to create different layers of random points reading different fields of an attribute table. For example: City #cinemas #malls #stores A 15 10 12 B ...
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1answer
40 views

Circle around all points of a layer

I want to draw a single circle which includes all points in a layer, but is as small as possible (so the two outermost points are exactly at the line). Is there any way to do this in QGIS (3.4) or ...
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1answer
30 views

Calculating minimum distance between all points of 2 different point layers using QGIS? [closed]

I use QGIS 2.8.3 or 3.4 whatever works better. I need to calculate the mimumum distance between all points of 2 different point layers. I was reading this post https://gis.stackexchange.com/a/62212/...
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1answer
31 views

How to count points of a point layer (shp) for each depth class of a bathymetry vector layer

I am using QGIS 2.8.3 but also have 3.4 whatever works better for this issue. I have a bathymetry shapefile and a point layer. One of the columns of the bathymetry vector gives the maximum depth and ...
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2answers
26 views

Check if two different class points fall within the same cell of a grid?

I am very new to R and GIS and statistics. I'm trying to find out if two set of points of different class (ie. species) that I have are aggregated or seggregated. For that I need to randomize the ...
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2answers
26 views

Highlight, count and delete overlapping point locations from different CSV layers in QGIS?

I have many CSV file layers in my project in QGIS, and quite a few layers have points which share the same location. Is there a way I can compare, count and highlight those "duplicates" and then ...
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1answer
29 views

Extracting pixel values for specific point locations in WGS 1984 / EPSG: 4326 image

I have a remote sensing image with GCS WGS 1984 / EPSG: 4326. I need to extract pixel values from this image which corresponds to specific point locations. For that purpose, I defined these ...
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1answer
29 views

Count points from two tables in polygons with PostgreSQL/PostGIS

I've got CREATE TABLE points1 ( point1id varchar PK, geom1 geom, date1 date); CREATE TABLE points2 ( point2id varchar PK, geom2 geom, date2 date); Both with indexes. I ...
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1answer
24 views

Defining point location at EPSG 4326 image

I am new in the field and I would like to ask which is the correct way to define a point location for an image with EPSG 4326 crs. I used QGIS software, and created a .csv file with the latitude - ...
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22 views

Extending line to points an unspecified distance using ArcMap? [duplicate]

I would like to extend polylines (roads) to existing points (addresses points). Mostly driveways that are very close to the points. Extend Line does not do it since it requires a specified distance ...
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2answers
69 views

Coloring points by raster values in QGIS?

While it's simple to color a point shapefile by an attribute field, I can't figure out how to match the colors with those from a raster. I have a raster file that I'm displaying with a continuous ...
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1answer
30 views

Point symbol rotation in QGIS 3

In QGis 2.x, I could rotate a point symbol towards the nearest geometry of a certain kind by using: geomnearest('featuretype', 'BEARING') This however does not work in QGIS 3.x, and I cannot find ...
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1answer
51 views

Do not show a point symbol for a point if closer than nn meters to another point in same layer

I have a layer consisting of points (big stones), and there are too many points to be able to show them all in the scale I am using in my print composer. What is the most efficient, and preferably ...
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1answer
23 views

TIme Series Analysis with Point Data

I'm using ArcGIS 10.3, and I have 20 shapefiles, each representing 1 year worth of data over the same study area, that contain postal code point data, with each point having some NDVI values (growing ...
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7 views

Assigning points to buffers in MapInfo12.0

First time using MapInfo. I want to essentially spatially join a point(s) that is situated inside a buffer together (so that the point and buffer have the same numerical ID). My table currently listed ...
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2answers
68 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 ...
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2answers
37 views

How to transfer POI layer from QGIS to OSMAnd?

I've got a POI layer (vector layer with single-point geometry) in QGIS and would like to import these points to OSMAnd under "My Locations" including the attributes (like name of the point). How can I ...
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1answer
34 views

Error on Line 109 of Creating Random Points in Layer Bounds Tool

I am using the latest version of QGIS 3.6.3 and I am getting the same error regardless of what I do when trying to run the Create Random Points in Layer Bounds tool. Here is the error: QGIS version: ...
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13 views

Using kernel density estimates as attributes for point data? [closed]

I have spatial point data (say addresses of all inhabitants of a metropolitan area or larger region) with context data for each point like age, gender, employment status, and so on. For each spatial ...
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1answer
154 views

Automatically add points geometry while GPS logging?

I have a PostgreSQL 10 Server (x64) running on my Windows 8 (x64 based) machine. On the top of my Postgres database, there is PostgREST API running that receives GPS data (5 seconds interval) from a ...
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1answer
106 views

Calculating the distance of each pixel in a raster from a point in PostGIS [closed]

I have a raster in PostGIS and a table of points. I want to calculate the distance of each pixel to each point. How can I do that? For example, if 9 pixels and 3 points, then I want to calculate 27 ...
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2answers
51 views

Move features in spatial objects in R

QGIS has a "Move Features" tool where points can be moved. Is it possible to move features from within R? If not, is it possible to open R spatial objects in QGIS, move points in QGIS then import the ...
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40 views

Extract values of pixels from each band of a multi-band raster with a shapefile in Python

I have downloaded multiple products from EO-1 satellite and I have created digital rasters out of them. Each of them contains 10 or 242 bands (those are hyperspectral). I have also created a shapefile ...
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1answer
33 views

PostGIS point table with dynamic content needs to have schema change: keep the change in 1 table OR separate them? [closed]

I have a web app with PostGIS point table as its main back-end data. Through this app, points can be : inserted (by clicking map AND filling form) updated (by moving the point location AND/OR by ...
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1answer
59 views

Finding lowest elevation in multiple polygons using DEM? [closed]

I have a polygon layer with six polygons. I need to have the lowest elevation point in each polygon using a DEM. The following explanation https://support.esri.com/en/technical-article/000011761 (...
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18 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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1answer
31 views

Select polygons which do not contain points

I am able to use the intersect tool to find polygons which overlap with points however I would like to find polygons which do not overlap with any points. I think the Symmetrical Difference Tool ...
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34 views

Allocating (or adjusting) points to closest polygon QGIS

Hi I've recently posed a question on how to create buffer areas for coastal borders of country polygons in order to match all my points (of which many are just outside country polygon borders) to a ...
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2answers
31 views

Converting point to polygon in a given distance

I'm working in QGIS 2.18 but I can work with QGIS 3 or ArcMap 10.2. I have a multipoint layer providing from a lasDataset where I've isolated the buildings. I want to create a polygon layer where ...
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32 views

Joining .csv with duplicate values to .shp layer with points and getting all points visible using QGIS?

My problem with QGIS (version 3.4.8) I have a .shp map layer containing point data of buildings. I want to join .csv spreadsheet to this layer so I can look into it and visualize different variables ...
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13 views

How to generate a layer of points from a database of lat, long using qGIS? [duplicate]

I am a programmer but I am new in QGIS. I have a database of some hundreds of points with lat, long information. It is an excel spreadsheet. How can I create a layer of points of each lat, long from ...
2
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1answer
64 views

Convert point layer to raster QGIS 3

I have a .csv-file containing x and y-coordinates as well as different variables with attributes (var1 to var3). The csv looks like that: Loading the data into QGIS with Add Layer → Add ...
2
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2answers
50 views

Selecting points along line in QGIS

How I can delete points along a line, with a distance tolerance? As you can see in the figure, the points near the line should stay, the points between the lines should be deleted
3
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1answer
65 views

Quartiling a vector buffer in QGIS 3.6

I am evaluating Hurricane data that has a radius which 64kt wind speeds were observed for a specific event. The properties of a Hurricane dictate that the wind speeds change in each part of said ...
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1answer
21 views

How to overcome missing of “sp::Point” to create points layer in shapefile?

I can produce Polygon layer from matrix in following way: pols <- lapply(cdf, Polygon) pls <- lapply(seq_along(pols), function(i) Polygons(list(pols[[i]]), ID = i)) sps <- ...
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17 views

Determining spatial relationships between two non-homogenous spatial variables

I'm working on a problem to understand the relationship between two point-based datasets with different sampling patterns. We surveyed random subset of properties in a neighborhood for the presence ...
4
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1answer
76 views

QGIS Draw by rule

I have a point layer with several colored dots. Each dot represent a find of a bumblebee species. E.g. red is B.terrestris yellow is B.hypnorum. In my attribute table I have a column named "nest" (...
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1answer
32 views

Constructing spatial weight matrix from triangulation of point coordinates in R?

I want to know how to construct spatial weight matrix from point coordinates in R,such as using the Lucas County, OH, housing point data set in spdep package. I read here,it says'the list of ...
2
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3answers
74 views

Plotting points along line with specified distances from start using QGIS?

I have a table with distances in a line in meters. Distance --------- 3110 3120 3145 ... I need to create points along this line in the distance from the start, as specified, using QGIS. My doubt ...
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2answers
71 views

Distance between two points on QGIS 3.4.7 and Python 3.7

I am under the 2154 CRS (RGF 93). I want to calculate the distance in meters between two point knowing their coordinates. Let's consider two points : A(474828.85, 6756169.31) and B(874895.75, 6756159....
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2answers
114 views

QGIS Assign point data to a line layer considering line direction

I have a line layer representing a river bank. The river bank is divided in numerous separate line features representing zones, each separate line has many vertices. The lines have a set direction. I ...
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1answer
75 views

Input points shapefile in shiny app

The application I created allows me to import a polygon shapefile into my Leaflet map. However, I would like to set up a point shapefile import on the same button. I tried several attempts, especially ...
3
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0answers
60 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 ...
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53 views

Identify features problem in QGIS

I am using QGIS 2.18 to identify points that fall out of a specific boundary but the identify features is not working. When I right click, it brings me the polygon feature. So i turned off the polygon ...
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1answer
35 views

Add points (proximity) ArcGIS [closed]

I have a punctual shapefile of wind turbines. The task is to discover if those wind turbines are visible to the human eye. The human eye can see a maximum of 1.6 meters. Which tool can create or add ...
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0answers
9 views

Point-distance analysis using time as an attribute

Is it possible to calculate "points within a certain buffer zone" for each point in a vector layer and do this by controlling time as an attribute field? I would like to analyse morbidity densities of ...
3
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1answer
151 views

Is it possible to view all the attribute data in QGIS

I use QGIS to map and store local history data. Because of this my point attribute data contains a lot of text. Since the textbox are so small it's hard to use and present the information. Is it ...
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0answers
14 views

Comparing two spatial point processes (Cross K Function)

Suppose we have two spatial point process on the same space. One has $n_1$ points, the other $n_2$ points. I have been reading about statistically testing for independence, attraction or repulsion ...