Questions tagged [coordinates]

Any of a set of two or more numbers used to determine the position of a point, line, curve, or plane in a space of a given dimension with respect to a system of lines or other fixed references.

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Difference between WGS84 datum and WGS84 UTM 15N

I have two digital elevation models. One’s datum is in WGS84, and the other datum is WGS84 UTM 15N. I am using both for geologic mapping. What’s the difference between the two datum? Is it okay for ...
1 vote
0 answers
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Connect two coordinates (start and end point) based on another layer in QGIS [closed]

I currently have two layers on a project using QGIS. The first layer is a CSV file containing some of the highway system's start and end coordinates. The second layer is a shapefile containing that ...
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QGIS Search and Line property numbers are all mess, reinstallation cannot work

All numbers in the corrdinate, scale in lower search panel and width, perctanage numbers in the line properties are not working. I tried reinstall but it didn't work. How can I do this?
2 votes
1 answer
299 views

Is the British National Grid and LAEI 2008 Grid the same?

I am not completely sure if this is the correct place to ask this, but I cannot find any sources confirming the differences between the LAEI 2008 Grid and the British National Grid. How would I ...
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1 vote
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How to extract clusters perimeter’s geographic coordinates?

I have a 4000 lines dataframe composed of 2 columns : latitude and longitude. I realized a DBSCAN clustering (python code) based on harvesine distance to group points within a radius of 2km (code ...
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How to scrape only tweets with lat_lon (geocode) information in R

I'm scraping tweets by using the rtweet package in R. As I'm interested in getting only tweets who bring with them the information about lat and long (geocode) about a specific location, I use the ...
1 vote
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Transform latitude and longitude to Transverse Mercator

I would like to transform point in WGS84 lat lon to Transverse Mercator: +proj=tmerc +lat_0=0 +lon_0=114 +k=1 +x_0=-49099.65399999998 +y_0=-2544749.4072 +ellps=WGS84 +units=m +no_defs I could easily ...
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3 votes
1 answer
235 views

Showing points as one big point

I've already made a map in QGIS, but the problem is that all the points of the coordinates are concentrated in one area in the map and I have to zoom in to see that it is several points. Is there any ...
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2 votes
1 answer
173 views

Finding northernmost/southernmost [...] point of polygon using QGIS

I have a layer with several polygons in it and would like to find out the maximal extend of each polygon in each direction, e.g. the western- and easternmost point etc. Just tracing the polygon with ...
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1 answer
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Get list of longitude and latitude for non-null pixels in a region (Earth Engine)

I'm trying to extract the pixel's mid point longitude and latitude value in GEE firms dataset where a fire has occurred. I filtered the image collection ee.ImageCollection('FIRMS').filterDate('2020-...
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2 votes
3 answers
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Create rectangle shapefile from 4 coordinate pairs

I have four coordinate pairs that I am trying to convert into a rectangle polygon by connecting them. NW:-97.22082767, 46.8326489 NE:-97.21021166, 46.83248334 SW:-97.22096573, 46.82846637 SE:-97....
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1 answer
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In FME, how can I extract the last few characters from a string where each string is a different length?

I have two string attributes, for both of which I need to extract the last 5 characters from each string. The length of the strings varies, with some 6 and some 7 characters. In this example, I have ...
2 votes
0 answers
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Extent of a proj4 string

I have a custom proj4 string in which my data is represented in Cartesian local coordinates. The example proj4 is below. +proj=tmerc +lat_0=44.155877943 +lon_0=141.655514872997 +k_0=1.000004976 +a=...
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High margin of error for circle point calculation

Created a circle of points, 50m, 100m, 150m and 200m from a central lat/lng (51.500421, -0.124754) using the sql functions below (one for the lat the other lng). My concern is with the accuracy of the ...
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1 vote
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Dataset with multiple coordinate notations (DMS, DD, etc.)

I have an original dataset in Excel form with locations given in coordinates. However, the coordinate notation is not uniform. Some are in decimal form, some in degree and minute form. How do I ...
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1 vote
1 answer
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Polygon coords are backwards

I have been given a delimited text file with a series of polygons representing areas in the UK. I have a column labelled WKT_LatLong and the column contains the polygons. When I import the data it ...
0 votes
2 answers
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How get distance in degrees to calculate buffers in AWS Athena?

Athena only allows to calculate the distance of the buffer in decimal degrees but this value varies with respect to the latitude in the globe, tate to obtain a distance according to the following ...
1 vote
3 answers
32 views

How do I create a feature using coordinates in a certain format?

I have been provided with the geometry and spatial reference of a number of features in this format: "spatialReference":{"wkid":102100,"latestWkid":3857}} Geometry [[[...
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3 votes
4 answers
233 views

Importing from Excel/CSV format to QGIS

I created a grid and used it's squares and it has 4 values in attribute table (each square has left, top, bottom, and right values). Every square is a different object. I try to export file from ...
0 votes
1 answer
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Calculating inter-point distances worldwide - a dilemma

I am new to GIS, and am to cluster geospatial datapoints using DBScan() in the fpc package on R. However, my dataset is in ESPG 4326 (WGS 84). Since WGS 84 stores lat-long as degrees, and not metres. ...
3 votes
2 answers
202 views

Calculate a new field containing X and Y coordinates

I am using QGIS 3.22. I wish to add a field that will represent X,Y or Lat Lon values I managed to create a field for X (using $X) and a field for Y (using $Y) but how do I combine them to one field ...
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3 answers
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Adding Lat/Long Coordinates to Frame in Print Layout

I am still learning how to use QGIS: I am making a map of a location in Antarctica, so I am using WGS 84/Antarctic Polar Stereographic coordinates (EPSG:3031). I have put the map into a print layout ...
1 vote
1 answer
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Extract Corine Codes from QGIS to an .csv

I'm doing a project and I need to extract the Corine Codes to a csv accordingly to a set of points. I have already mapped these points on QGIS in a .csv format (with latitude and longitude) and I ...
1 vote
1 answer
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Extract SDO_GEOMETRY line elements using index position / dot notation

SDO_GEOMETRY; Oracle 18c: Is there a way to extract elements from an SDO_GEOMETRY line using an index position / dot-notation in a SQL query? For example, extract the X coordinate of the second vertex ...
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1 vote
1 answer
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How to tell if a layer is Z-aware or M-aware

I am trying to detect if a layer is Z-aware or M-aware. If it is, I need to flag it to be reconfigured without Z/M-awareness. In the example below, I have already pulled down the layers and am ...
1 vote
2 answers
41 views

Reading coordinates linked/separated with underscore

I have a large dataset on bad signal areas in Germany, where UTM coordinates of points are given in one single column, separated by the characters _ , for instance: 281200_5656877 Is there a common ...
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1 answer
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Finding intervals of latitude/longitude of cities throughout the world at 0.01° precision [closed]

Geographical coordinates determine a specific point on a map. I am searching for the coordinates interval (thus to frame the area) of different large cities by latitude/longitude at a 0.01°x0.01° ...
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Leaflet get map coordinates to outside of map click event function

Is there any way to get coordinates values outside of the map click event function? var x_array = []; map.on('click', function (e) { let latlng = map.mouseEventToLatLng(e.originalEvent); var x = ...
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0 answers
24 views

Using a tool in QGIS to generate a route over every road within a selection

Currently I have a map with some roads on it, I am using the coords of the junctions/corners in a custom app as points to be drawn using MonkeyC code on a Garmin device. I want to connect them with ...
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Find coordinates of nearest polygon for multiple points QGIS

I successfully used the function suggested here. However, I do not know how to iterate the expression for each point of a Multipoint file, to find the coordinates of the nearest point on the polygon ...
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4 votes
2 answers
474 views

Order of latitude and longitude in EPSG:4326

I recently started working with GPS data in PostGIS and am very confused about the order of latitude and longitude. I'm from Europe, and here everyone I know uses latitude first, longitude second, e.g....
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Converting roads line string to polyline covering all roads

I attempted it with a linestring of Australia exported as coords array from QGIS a while ago and tested using a special website where you can input a coords array which then displays as polyline. Now, ...
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1 answer
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Get coordinates of .pbf/.osm of ways and relations directly?

Is there a tool for pbf or osm files so that I can see the coordinates of ways and relations directly? Currently ways have only references to nodes. So if I want to have the coordinates of a way, I ...
1 vote
0 answers
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How to convert osmium.osm.location cordinates to normal format coordinates in python(Pyosmium)

I have extracted the coordinates data from nodes using pyosmium. Though I was successful in extracting the data but the coordinates which osmium is giving is not in normal format, I tried to convert ...
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0 votes
2 answers
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QGIS doesn't show datapoints of .csv file

I am not yet familiar with QGIS and I am trying to add an Excel file with GPS points and data (add layer > add delimited text layer). The Excel shows up as a layer, but the points do not show on ...
6 votes
3 answers
594 views

Extracting latitude and longitude pairs as list from LineString in GeoPandas

I have a GeoPandas GeoDataFrame that looks like this: shape_id geometry 1000252 LINESTRING (4.91790 52.34725, 4.91797 52.34715... 1000254 LINESTRING (4.80382 52.34495, 4.80413 52.34500... ...
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1 answer
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Converting from esoteric coordinate systems to EPSG:4326 WGS 84

I have a shapefile with coordinates in the "EPSG:3081 NAD83 / Texas State Mapping System" coordinate system. I'd like to be able to convert these to EPSG:4326 WGS 84 and it's not clear how. ...
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1 vote
1 answer
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In ArcGIS Online, can an X/Y field be auto-populated when a point is added?

I have a web map that is going to be edited by additional staff. When they create a point, a form pops up with several fields that are domain-enabled. Can the X/Y fields be auto-populated when a point ...
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2 votes
1 answer
130 views

Iterating over each pair of coordinates in Multipart geometry using Shapely

This question is related to Access each (x, y) within Multipart gdf.geometry.interiors. With a MultiPart geometry.interiors: from shapely.geometry import Polygon exterior = [(2, 8), (7, 8), (7, 3), (...
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0 answers
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Extracting shapes from vector road data (specifically circles and lines)

I’d like to extract some specific data from QGIS to be drawn in a Garmin application which uses Monkey C but I am unsure of how to do it. Currently I use many coordinate points to portray roads made ...
1 vote
0 answers
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Create attribute column with index sorted by coordinates in Point Layer

I have a layer of points and I want to add a column with an index according to the coordinates. I already thought about sorting the UTMX and UTMY coordinates, but still the result doesn't convince me, ...
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1 answer
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Coordinates on Input app

I am using the Input app for QGIS (V. 3.18). Is there a way to show the coordinates of my location on the map?
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2 votes
1 answer
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LidR if-loop on coords (is/isn’t inside extent)

I'm trying to calculate metrics on a buffer around points with Lidar data. But some of my points are outside my Lidar area, thus my loop stops when it finds a point outside. I was thinking about ...
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Rotate latitude and longitude coordinates based on True North

I have a number of latitude- and longitude coordinates. In addition, I have two other data sources: trueNorth = 166 # I only know the value and a compass: How do I update my coordinates based on ...
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1 vote
1 answer
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Convert Coordinate Notation warning, empty output

I have the following UTM coordinates: ID Easting Northing UTM 1 10V 0614067 7080117 10V 614067 7080117 2 10V 0614134 7080506 10V 614134 7080506 3 10V 0614193 7080765 10V 614193 7080765 I have ...
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1 answer
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Display geographic coordinates in a projected OpenLayers map

I'm using OpenLayers 6 to create a projected map in EPSG:25830. I've included the following code to display the coordinates in the map and it works ok controls: ol.control.defaults().extend ([ ...
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How to make polygon shapefile from .csv file with ShapeSTArea and ShapeSTLength features?

I have a .csv file that includes x and y coordinates as well as ShapeSTArea and ShapeSTLength features. (see below) I'm hoping to turn this .csv file into a shapefile that instead of displaying ...
0 votes
2 answers
105 views

Transforming using ntv2 nadgrids is behaving different between GDAL 2.3.1 and GDAL 3.4.2

I am working on upgrading to a newer version of GDAL and have an issue transforming coordinates using nadgrids (the beta2007.gsb ntv2 file which can be downloaded here) using GDAL 3.4.2. The issue is ...
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1 vote
1 answer
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Problems with uploading point coordinate British National Grid data into QGIS as .csv file

I'm very much hoping someone can help me with this, please. I have uploaded raster data from Digimap to use for maps for field sites for my research in the UK. The issue is that this map data use ...
0 votes
2 answers
87 views

Getting habitat map data into CSV file in QGIS

I am fairly new to QGIS and I am doing a masters degree. I have a number of GPS coordinates which represent the location of elephant sightings. I need to find out what habitat type each of these ...
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