Stack Exchange Network

Stack Exchange network consists of 175 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers.

Visit Stack Exchange

Questions tagged [point]

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

0
votes
0answers
15 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 ...
0
votes
0answers
9 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 ...
0
votes
0answers
14 views

How to bind points with polygons extracted from raster using R [on hold]

I have big tiff and load it using raster: tif = raster(paste0(path)) Next, I can extract all the polygons from the file (using some value P of interesting layer value): rtp = rasterToPolygons(tif, ...
2
votes
1answer
39 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
votes
2answers
40 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
votes
1answer
54 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 ...
0
votes
1answer
18 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 <- ...
0
votes
0answers
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
votes
1answer
72 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" (...
1
vote
1answer
21 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
votes
3answers
61 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 ...
1
vote
2answers
47 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....
3
votes
2answers
89 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 ...
0
votes
1answer
42 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
votes
0answers
48 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 ...
0
votes
0answers
48 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 ...
0
votes
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 ...
0
votes
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
votes
1answer
147 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 ...
0
votes
0answers
10 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 ...
1
vote
0answers
38 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, ...
-2
votes
3answers
38 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.
0
votes
0answers
21 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 ...
0
votes
0answers
28 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 ...
0
votes
0answers
36 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
vote
1answer
30 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 ...
2
votes
1answer
85 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 ...
1
vote
2answers
53 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
votes
0answers
85 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
votes
2answers
76 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
vote
3answers
55 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, ...
0
votes
1answer
54 views

Taking data from a CSV file to create points on a shapefile [closed]

I am trying to import data from a CSV file and write a script that will generate points on a new shapefile. I am running into issues for when I try to update the InsertCursor. I get an error of "not ...
0
votes
1answer
108 views

ArcGIS JS API Failed to load feature layer

I want to add test feature on my ArcGIS map using feature layer. I create layer using Graphic as a source. After a lot of googling I create my point the following way: require([ "esri/Map", "esri/...
2
votes
1answer
53 views

Find a point in a multipolygon geometry

I need to know which points from Table 1 are contained in Table 2. In Table 1 I have longitude and latitude and I made points with ST_SetSRID(ST_MakePoint(d.longitude, d.latitude),4326) as geom ...
0
votes
0answers
13 views

Convert cluster points into a single point

I need to try and group cluster points by attribute into one point. So all points with the same attribute need to be grouped onto 1 location.
0
votes
2answers
181 views

Convert SpatialPoints to SpatialPointsDataFrame

Give an object x of class SpatialPoints how do I convert it to a SpatialPointsDataFrame ? class : SpatialPoints features : 50 extent : 3187836, 3827836, -489229.3, 950770.7 (xmin, ...
2
votes
1answer
21 views

Compare two points and conclude direction

Is there a simple method in geotools or JTS to conclude the direction between two geospatial points? I would like to conclude if point A is (north, south, east, west, NW, NE, SW, SE) when compared ...
1
vote
1answer
80 views

Interpolation of 3 borehole data

I have three points (boreholes) on the map. I created them using shape file layer. Each borehole shape file layer shows the strati-graphic section of the ground. (i.e. between 0-50 m = Gravel , 50-60 ...
1
vote
1answer
87 views

Changing coordinates of points in the Attribute Table in QGIS

I have a shapefile. Within the shapefile, there are approximately 500 points. I want to change the coordinates of these points in the Attribute Table. But there is no coordinate column in Attribute ...
1
vote
0answers
37 views

Filtering points in cloud to find representative set

I have multiple sets of points that represent 'instances' of GPS traces. When ordered and connected, I have a line that represents each trace. I'm trying to find the most average line through this ...
0
votes
0answers
21 views

Distance from a point to a poly line and attributes from the poly line GIS

I'm trying to figure out what tool would be best to get the distance from multi-points from multi polylines and see which attributes are closest to what point. I'm doing a project where I have ...
-1
votes
1answer
20 views

Insert a point into feature class based on another point [arcpy] [closed]

My assignment is to insert (using insertCursor) a new city at 0.02 decimal degrees east and 0.03 decimal degrees south of another city. The cities shapfile did not originally have x-y coordinate ...
1
vote
0answers
18 views

QGIS extracted azimuth used for symbol rotation seems not reproduced faithfully [closed]

A field of calculated azimuths* (degrees) of digitized two-point lines was created. Field expression to calculate azimuth: degrees( azimuth( point_n( $geometry ,1) , point_n( $geometry ,2 ) ) ) . ...
0
votes
1answer
74 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 ...
0
votes
0answers
20 views

How do I find the closest distance to a line and then find the length of the remainder of the line to a point?

I want to measure the distance of a shape to a line and then follow that line all the way to a point and calculate the distance traveled. Here is my current map. I want to store that distance value ...
4
votes
2answers
66 views

QGIS Random point inside polygon **but** - with minimum distance between points from different polygons

I am trying to generate random points in stratified area with 2 polygons. I want to generate 6 random points - 3 in each but to set minimum distance not only between points from same polygon but ...
2
votes
2answers
84 views

Generate points along branching lines

I am looking to generate points along a series of connected lines at regular intervals, but I wish to keep this interval even when a line is branching into 2 or 3 other lines. All the regular tools I ...
0
votes
1answer
25 views

GeoServer Point Labels not rendering until Scale = 1 : 545K

I have a series of points that I have reading an attribute to display a label. I don't see the labels on my map until Scale = 1 : 1M when SOME of them start to show up. But it's not until I hit Scale =...
2
votes
1answer
34 views

I want to plot point shapefile on a raster to know if they are at the right place in R

I have one raster and a shapefile of points. I want to check them if they are in the same coordinate system by plotting them together on a map (like in a classical GIS), here the R script : # raster ...
1
vote
1answer
49 views

Creating points with attributes from coordinates in ArcPy

I know how to create points by coordinates with arcpy using the following code: import arcpy ptList =[[20.000,43.000],[25.500, 45.085],[26.574, 46.025], [28.131, 48.124]] pt = arcpy.Point() ptGeoms =...