Questions tagged [point]

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

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25 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
92 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
37 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
53 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
30 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 ...
4
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2answers
112 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
102 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
53 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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0answers
24 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
184 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
140 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
75 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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165 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
35 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
77 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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23 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
39 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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0answers
38 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
32 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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0answers
36 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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16 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
282 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
81 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
103 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
26 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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18 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
90 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
53 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
136 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
216 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
165 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
228 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
95 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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0answers
65 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
37 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
155 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
32 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 ...
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147 views

Extract Raster Values with points in R

I have a raster file with gridded population raster26 class : RasterLayer dimensions : 132, 140, 18480 (nrow, ncol, ncell) resolution : 699, 931 (x, y) extent : 2248290, 2346150, ...
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3answers
55 views

How do I generate points at the intersection of the line with each polygon?

I need to generate points in the places where the line shape cuts to the shape of polygons.
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31 views

Scattering overlapping points using ArcGIS Desktop?

I am working with a series of points that are located at the same location. Can I scatter these point so that it is possible to visualize them as I zoom in? Unfortunately, they don't have any ...
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0answers
66 views

GeoServer: colormap for point data

How could I create a continuous colormap for point data in GeoServer? I am planning to serve satellite measurements (METOP IASI) as point data in GeoServer 2.15 and want the point colors to represent ...
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0answers
45 views

Get a 250x250 tile around a Point in an Image

I am trying to randomly sample 250x250 pixel tiles from a big Image, let's say 40000x40000. In this case the big Image would be the Hansen Dataset. I want to sample points in which a forest loss has ...
1
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1answer
32 views

Selecting the name of the raster layer for each point in a shapefile (QGIS)

I have multiple raster files (i.e. elevation in the United States) and over 300 points in a separate point shapefile. Each point lies in only one raster file. I'd like to be able to find out the name ...
3
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1answer
273 views

QGIS SAGA split lines at points creates redundant lines

I have 2 projected (ESPG 2039) layers of roads and points (bus stops and junctions). I snapped the points to the roads layer and this is how it looks: I then try yo use Saga Split lines by points to ...
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2answers
57 views

Avoiding invisible points when using fixed style in QGIS?

We often need to load measured data using predefined color style to make it simple and easy to compare layers with each other. We have something like this: the problem is that sometimes there are ...
6
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0answers
97 views

Calculating viewing angle (2D) between polygons and points [closed]

I am looking for a solution to the following problem. I have several points (for example houses) and several polygons (eg forests). Seen from the houses, I can see the forests within a certain angle. ...
0
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2answers
368 views

Generating random points within series of polygons according to density using R

I have a city that is made up of a number of wards, each with an unequal population. I would like to generate a set of "random" points within the city, but the randomness is influenced by the ...
1
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3answers
64 views

Showing two sets of points from two different fields in QGIS?

I made a union of two adjacent shp (points) files with the same theme (Geochemistry) so the resulting attribute table gave duplicated fields, for example: ID, As_ppm, Ag_ppm, Pb_ppm, ... , ID_2, ...