Questions tagged [coordinate-system]

A reference framework consisting of a set of points, lines, and/or surfaces, and a set of rules, used to define the positions of points in space in either two or three dimensions. This tag also refers to cartographic projections and coordinate system transformations.

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How to do a Lee’s Tetrahedral Conformal Projection of Antarctic/South pole on QGIS?

I want to do map of Antarctic using the Lee's Tetrahedral conformal map projection as the image below using QGIS version 3.4. Is it possible to make a custom CRS to do it? If yes, what's the ...
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Does the projection of a PostGIS table affect the rendering speed in QGIS?

I am interested to know whether changing the projection of a PostGIS table will affect the rending speed when viewing it in QGIS. I have two layers coming from QGIS which are exactly the same and ...
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Printable Globe in QGIS

I'm trying to figure out how to use QGIS to print a map so that it can be wrapped around a sphere. I haven't found a projection that will display the map in a way similar to these. It sounds like ...
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Setting CRS of raster to EPSG 3035 using R

I am trying to set the CRS of a raster file with the following code: library(raster) r<-raster(xmn=0,xmx=10,ymn=0,ymx=10) crs(r)<-CRS("+init=epsg:3035") The warning message is: ...
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Mapproxy transformation from Web Mercator to WGS84

I want to transform tiles defined in Web Mercator (EPSG:3857) to WGS84 (EPSG:4326) using Mapproxy. Unfortunately the resulting WGS84 map gets more and more distorted to the poles. Here is my ...
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Crop raster based on another raster R

library(raster) How can one clip one raster based on another raster? RasA: class : RasterLayer dimensions : 459, 533, 244647 (nrow, ncol, ncell) resolution : 10000, 10000 (x, y) extent ...
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Equal Earth Projection in Google Earth Engine

I'm trying to get a gobal visualization similar to what NASA does. They are probably using popular Equal Earth projection (EPSG:8857), but this fails in GEE. In order to implement this projection, I ...
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How to transform ERA5 vertical datum to WGS84

I am trying to plot a netcdf file from ECMWF ERA5 in a folium map but I am having troubles with the projections in the file. ECMWF documentation states: ECMWF data is referenced in the horizontal with ...
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Datum transformation in QGIS Server 3.10

I have a QGIS project that uses data stored in Web Mercator (epsg:3857) spatial reference system. The project itself has epsg:5514. To have a better precision I use one of datum transformations that ...
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ArcGIS project raster produces incorrect vertical coordinates

I have a DEM in UTM (meters) / NAVD88 (meters) and need to transform it to State Plane (feet) / NAVD88 (feet). Unfortunately, I do not have the raster calculator in ArcGIS, so I have to use Project ...
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Preventing ogr2ogr from generating invalid geometries in transformation

I have the following GeoPackage: https://drive.google.com/open?id=1COcGcbZQIsW6NrzuD-K-Kijpvg4BYQ54 I have checked it with spatialite and it does not have invalid geometries. It has a ...
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Automatically creating user CRS from postgis in QGIS

I have my custom CRS in table "spatial_ref_sys" in database. When I load layer from schema "public", QGIS create this CRS. But if layer from other schema, it's not. What I need to solve this problem?
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Fuller/Dymaxion in proj4/gdal/qgis?

I know this question has been asked a million times already, but I can't find many detailed responses on exactly what I want to do. As far as I can tell, the full C code for the fuller projection is ...
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proj4js with geocentric CRS

I am developing a little web app to transform coordinates between CRSs. To do that I am using proj4js, but I notice that proj4js can't work with geocentric CRSs. Is there another tool similar to ...
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The drawing of Thiessen/Voronoi polygon boundaries - are the bisecting lines truly perpendicular?

I am concerned with how QGIS (version 2.8.1) and ArcGIS (version 10.0) draw "perpendicular bisecting lines" when Thiessen/Voronoi polygons are created. When using either program to create these ...
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How to interpolate within defined boundaries of a deformed mesh using R?

My goal is to create an interpolation map of some output model results that are mapped on a deformed mesh (from a numerical simulation). The model results are in an x-y plane (representing coordinates)...
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Which spatial-reference system is used by the Haversine formula?

I've been reading Pro Spatial with SQL Server 2012. It discusses the various spatial-reference systems (SRS) that can be used when defining a coordinate system. According to the book, Google uses ...
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Convert land-based camera image pixel x,y to ground lat/long or x,y,z

I have a number of cameras at various known locations (x,y,z) and directions that are above ground about 20 feet pointed at different ground locations about 100 feet away from each camera, and whose ...
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How to use a Spilhaus/ESRI:54099 projection in QGIS

I am trying to make a map using a Spilhaus projection, similar to the one implemented by Esri here. QGIS has ESRI:54099 WGS_1984_Spilhaus_Ocean_Map_in_Square in its list of available projections, ...
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Projection planes that conform to the surface

The ISEA projection and other global ones (see DGGS standard) showed that the technology exists: it is possible to use a "coarse cover of polygons" (typically triangles, squares or hexagons)...
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Function and meaning of parameter lat_0 in Transverse Mercator Projection in PROJ String

One may specify a custom Transverse Mercator in PROJ library string with something like: proj +proj=tmerc +lat_0=-25 +lon_0=-49 For me the function of the parameter lon_0 is clear, is the Central ...
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Why won't this custom projection validate when testing it in QGIS?

Months ago I used some info on this site to create a custom CRS. It works fine for most of what I need such as creating maps, but functions like Warp (Repoject) and Define Shapefile Projection do not ...
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Reproject WGS84 raster file to topocentric LTP-ENU using GDAL with a custom proj string

I have some raster files which are given in WGS84. As an example, here are some gdalinfo for one of those: Driver: GTiff/GeoTIFF Files: dem_r.tif Size is 2000, 911 Coordinate System is: GEOGCRS["...
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Wrangling precision in QGIS with a hypothetical planet

I'm a tabletop roleplaying gamemaster wanting to use QGIS to help organize my notes according to place. GIS addresses my need to store notes and other data that may be anywhere from a few feet from ...
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Rotate coordinates from climatic data in raster format (cordex-EU domain 11) to usual coordinate systems

I am trying to create a dataset that shows future climatic condition in Europe aggregates to NUT2 administration level in R. To do so, i work with cordex data (domain EU 11), that is coming ...
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EPSG:4326 being saved as CRS:84

I am trying to save a GeoJSON file in QGIS as EPSG:4326, but it keeps being saved as CRS84. EPSG:4326 and CRS84 are the same except CRS84 saves coordinates as long, lat - and EPSG:4326 saves them as ...
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Seeking Public API to get GPS satellite's position?

Is there any public availible API that allows you to retrieve the current coordinates of satellites such as GPS and Galileo? I've only found ways to get Satellites Ephemeries and calculate the ...
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Intersection and area calculations in geographic vs. projected coordinates

I think one should do intersection calculations when layers are in the same coordinate system, and one should do area calculations in the appropriate projected coordinate system. The order matters, ...
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Showing Polar coordinate grid?

I've found some maps for Antarctica https://nga.maps.arcgis.com/home/webmap/viewer.html How can I show polar coordinate grid for it? I've got the grid source code in grid_wgs.js (I use OpenSeaMap ...
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Adding GDA2020 NTv2 transformation to ArcGIS 10.5

The implementation of GDA2020 is drawing near! In an effort to be ready before time I have downloaded the NTv2 Grid Shift Binary (GSB) transformation grid from ISCM (available here) who are the ...
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Wrong reprojecting of a shapefile with to_crs in GeoPandas

When reprojecting an ESRI Shapefile (EPSG:21781) into an EPSG:4326 with QGIS and then importing the resulting file in GeoPandas and plotting it, the coordinates are correct. When importing the same ...
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Local grids with rotated north in QGIS

Like many people in geology and archaeology I need to work with local grids that have eastings and northings from a specific reference point, and typically have a difference alignment/direction of ...
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create custom SRID from OGCWKT

I wanted to create a new SRID for use in PostGIS. My goal is to have a SRS that can cover an entire state (instead of have multiple zones as in SPCS). For example, I wanted to create a new SRS for ...
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Re-referencing raster in rotated coordinate system by "de-rotating" it

My Trying to define a "rotated regular grid" coordinate system in QGIS question about this got closed because there was already an answer to it, which I understand. I went to the answer in ...
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Using PROJ.4 to convert from 3D Cartesian ECEF coordinates to Lat/Long coordinates with inverse Icosahedral Snyder Equal Area (ISEA) projection

I have a set of X, Y, Z coordinates in the Earth Centered Earth Fixed (ECEF) geocentric system. I need to convert them from ECEF coordinates into Latitude/Longitude coordinates using an inverse ...
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How to get pixel coordinates in QGIS georeferenced output map?

using the QGIS Georeferencer GDAL plugin, I can select GCPs (ground control points) on a map (plain raster input map image in a format like PNG or TIF) in an unknown projection and boundaries, and ...
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Sphere rendering inside out using QGIS on Ubuntu?

I'm trying to use QGIS to show earthquakes around a 3d globe. I changed my CRS to 'Sphere_Van_der_Grinten_I' and it rendered like this: Here's a report from Hardinfo on my system and display: ...
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QGIS: CRS, ellipsoids and area calculation

I have a doubt about dynamic CRS, ellipsoids and area calculations. I am using QGIS 2.14.0 (still waiting for IT to install 2.14.11...) When I load a polygon table into a new, empty project, it comes ...
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Can gdal be used to generate a single patch of the HEALPix projection?

Given a geo-referenced map of the world, I am able to produce a version with a HEALPix projection using gdalwarp like this: gdalwarp -t_srs '+proj=healpix +a=1 +ellps=WGS84 +wktext' -te -3.14159265 -...
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Is there an EPSG code appropriate for locally projected data?

I often use GIS to track some very local things. Particularly, mapping on microscope slides works quite well. These obviously cannot be georeferenced in any meaningful way. Perhaps the right thing to ...
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Converting lat/long to EPSG:3857 coordinates

The map widget I'm using gives me click locations in lat/long. I need to convert those coordinates to EPSG:3857 to query a database. Most of the solutions I've found use the formula described in ...
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QGIS 3D Globe Plugin Elevation Map Projection

I'm trying to get a map setup using the QGIS 'Globe Plugin'. I've been trying to use the UK Environment Agency LIDAR data as an elevation map. After a bit of puzzling this out I've found that the ...
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Creating Proj4 string for local coordinates

I am fairly new to coordinate system conversion, so am rather lost on the following problem. We have been using Proj4 to convert between various coordinate systems which is fine for known coordinate ...
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Creating custom CRS based on local project parameters in QGIS?

I'm having trouble creating custom proj4 CRS files to work with existing .shp files on local project coordinates. (Local in that the coordinates are relative only to themselves and not the 'real world'...
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how to set the geotransform using GDAL in python

I am trying to create an image from a numpy array and georefenrece it so that I can import it into qgis. I have the latitude and longitude in degrees for the top left corner of the array as well as ...
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Schematic Map in GIS Tools?

The Question: Is there way to leverage GIS tools to author/edit a schematic map where elements' geometries has canvas-based coordinates rather than real-world coordinates on Earth? Perhaps to ...
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Why does field calculator compute area in square meters?

I am using EPSG:102748, and have set my Settings/Option preferred measurement units to ft. My CRS is NAD_1983_StatePlane_Washington_North_FIPS_4601_Feet, and when I use the measure tool, it returns ...
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Reprojecting a population raster from LAEA to lonlat

I have a population density raster from the EEA which is based on the CORINE land cover 2000 data. http://www.eea.europa.eu/data-and-maps/data/population-density-disaggregated-with-corine-land-cover-...
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Is there a way to expose Spherical Mercator Lat Lon in Google Map API?

The map tiles in the Google Maps are in Spherical Mercator projection (srid 900913), but in the API the methods report coordinates in Lat/Lon WGS84, e.g. map.getCenter(). Is there a way to return the ...
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