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.
7,422
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Generating png of map projection from formula
I want to build something that takes the formula for a map projection and renders a png map.
So the input would be
A vector graphic representation of the world that is used to determine how to color ...
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1answer
21 views
QGIS 3.22 Project transformation error
I have installed QGIS 3.22. I got this error when I was trying to open a project.
I downloaded the .tif file.
Then clicked on Install nzgd2kgrid2005.gsb
Then, I got this error.
Any help will be ...
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13 views
Generate OpenMapTile VectorTiles in projection other than 3857
Using OpenMapTiles I am trying to generate vector tile sets in several projections other than 3857 (WebMercator).
If I change the srs and and srid values in the openmaptiles.yaml there is no impact on ...
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1answer
30 views
Does repeated coordinate re-projection cause a loss in accuracy?
If I take a set of GIS data (shapes, points, lines, etc) and convert the projection many times, will there be a loss in accuracy in the data?
The reason I ask is that I have a dataset from OSM which ...
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25 views
Why do formal mathematical definitions of map projections define x and y in terms of phi and theta?
On Wikipedia all of the projections are mathematically defined in a form like x = f(phi,theta).
Is there a reason that this is used instead of phi = f(x,y) ?
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Transform top-down vector layer to angled view
I have a 3D model of a fictitious city and I'm creating a little OpenStreetMap/Google Maps clone for it. The current workflow is fine: I render the fake satellite view pictures from a top-down ...
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10 views
Graphical Modeler Algorithm Not Functioning for Reproject (warp) - Passing Through This Step
I have a reprojection problem in my modeler. The input appears to be failing and continues with the default layer's projection.
[Polygon input] -> shared CRS input - reproject
[DEM/Raster] -> ...
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25 views
QGIS WGS 84 CRS - Incorrect/Large Coordinates [closed]
I am having an issue with QGIS where no matter what CRS I use, it always displays extremely large numbers for the coordinates, for example - (15838567,-4513529) instead of a normal latitude and ...
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Oblique azimuthal stereographic projection: deriving the point-of-tangency
As a small part of a larger analysis problem, I have a set of Cartesian coordinates (x, y in meters) that define a grid of points on a projected plane. I need to convert these points to (lon, lat).
...
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19 views
NAD83 NTv2 Transformation in QGIS
I am located in Canada and use a lot of historical data which is in NAD83 original. NAD83 original was found to be flawed, and in Canada was updated to NAD83(CSRS). I find QGIS projects CSRS quite ...
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1answer
49 views
QGIS Grid not displaying correctly
I'm trying to create a map from a specific province in Argentina in QGIS 3.10. I am trying to create a map showing multiple coordinates showing hail fall data exported from a csv file and projected on ...
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25 views
QGIS Georeferencer: How to deal with .points file using different CRSs?
I have some scanned maps as tifs and their corresponding .points files. The GCPs were set by different users erroneously using different CRSs. E.g. Of 340 points 180 were set using EPSG:23700, 160 ...
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26 views
EPSG:27700 missing from available CRS in GeoServer
What would cause EPSG:27700 to not be available as a CRS in an out-of-the-box installation of GeoServer?
I've been using GeoServer on Windows for years with no issues, but as an experiment our IT ...
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19 views
Converting long/lat coordinates for a selected feature in Mapbox tile GeoJSON such as a road to Unreal Engine x,y coordinates
The goal is to be able to download a real-world height map, import it into Unreal as a landscape, then draw roads on that landscape based off the GeoJSON file coordinates for that road.
I use this ...
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Orientation Conversion: ECEF YPR (321) to LTP Tait-Bryan angles
I am looking for guidance to convert ECEF orientation (Yaw/Pitch/Roll 3-2-1) to the corresponding LTP (NED/ENU) Tait-Bryan angles.
There are several excellent resources to convert position between ...
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31 views
Error in rasterFromXYZ(xyz = centroids[, c("lon", "lat", "id")], crs = WGS84) : y cell sizes are not regular
I'm trying to convert a csv file set of values into a raster but keep receiving the above error.
#Set raster options to improve speed of calculation
rasterOptions(tmptime = 4,
progress = ...
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33 views
Are ESRI files preprojected? Trying to square a small projection with Web Mercator
I received a shapefile (with all its sibling files) from an urban planning agency in Paris that I'm trying to overlay on map tiles from either Google Maps or OSM. The source file uses the projection ...
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30 views
Creating custom CRS by rotating EPSG:27700 OSGB (for mine grid)?
I am trying to georeference a mine plan, but it uses a custom CRS based on the following:
I gather I just need to rotate the OSGB grid system by 25 17'59" ?
is this just a case of modifying the ...
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17 views
Setting CRS/SRID of raster tables referenced in raster_columns view in PostGIS database
I imported some DEMs to my PostGIS db and two have unknown CRS (maybe because their CRS code is Esri and not EPSG).
Do I update the raster_columns view or do I directly set/assign the CRS of the said ...
4
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2answers
190 views
Does spatial data layer have to have both projected coordinate system and geographic coordinate system?
Since maps are flat, I feel like the PCS is needed for the spatial data layer to know how to draw it out, but I think the layer also needs the GCS for the coordinates to show where the location is on ...
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1answer
38 views
Reprojecting NetCDF naming data from rotated pole coordinate system to WGS84 in R
I am using data from UKCP Local Projections at 2.2km Resolution. The data does not have any stored coordinate reference system. However, the associated documentation explains that UKCP use rotated ...
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29 views
How do I fix a mismatch between PROJ version and proj.db?
When transforming the CRS in QGIS, I get the following error: No transform available between EPSG:32722 and Custom CRS (or any CRS). When I click on Details, I read the following message:
No ...
7
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1answer
91 views
What is signal when specifying the CRS of a layer using PyQGIS?
What is the signal when the CRS of a layer changes?
I tried QgsProject.instance().crsChanged, but this is a signal that happens when the project CRS changes.
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49 views
How to project a geodesic polyhedron of triangles onto Earth and capture data in lat/lng coordinates of some sort? [closed]
I am looking at what3words.com and saw this question on the GIS SE: How does what3words build a grid of squares on the surface of the Earth? . An employee a what3words pointed out that the "data ...
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1answer
30 views
Projection of CSV file is not aligning with shapefile
I am new to QGIS and am exploring some open data sets from NYC as a self-guided project.
I am trying to map the branches of Brooklyn Public Library with a simple base map file of NYC streets, zip ...
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0answers
27 views
GeoServer - render transformation reprojection issue
I'm visualizing a NetCDF file with the NetCDF plugin and using ras:contour rendering transformation to display the isolines. The raster data and contours look correct when checking the layer in the ...
3
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1answer
53 views
Appropriate distance and CRS
I want to use buffer function using miles or kilometers in Louisiana. I checked Changing unit of measure from degrees to meters in QGIS?. The original CRS is EPSG:4326 - WGS 84 - Geographic and the ...
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1answer
45 views
Determine the coordinate system used in GeoJSON file?
I'm fairly new to geodata. I got some data (coming from mapbox api from scraping a website) with all geometry points. I'm trying to convert these points to long/lat so I can use it in my project (and ...
3
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1answer
88 views
Polygon Union not working in QGIS
I am completely new to QGIS, so this issue might be really easy but I'm at a total loss on how to proceed.
I am attempting to combine datasets in QGIS utilizing the Polygon Union command, but am ...
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1answer
78 views
EPSG:3857 units are in meters, why is ST_Distance showing distant locations to be less than a meter apart?
According to Google, these two points are about 137 meters apart, yet the result of ST_Distance reports just a fraction of a meter? The units of the result should be in meters, as I understand it, ...
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28 views
Saving GEOS projection data into a NetCDF file
I have full disc data in GEOS projection and I would like to save this data into a NetCDF4 file.
As the NetCDF file needs to have basic dimensions of lat, long and time (which can be set to 'None') ...
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44 views
Building a square grid on Mapbox - distortion [duplicate]
I’m trying to divide my Mapbox Map into a grid of consistent squares. First I made a geojson grid which took the total:
[-180, 180],[-90, 90] total area into equal 10x10 grids.
For example first one ...
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36 views
TIFF flipped along X-axis when reprojecting in QGIS
I’m very new to GIS software and am having some trouble. I’ve looked for the answer to this question elsewhere but can’t seem to find it. Can you point me to it?
I’m trying to create a custom fantasy ...
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19 views
Convert COG with CRS to dimensions with equal longitude latitude
I have some Cloud Optimized GeoTIFFs exported in a certain CRS. Although the COG was exported in with equal longitude/latitude lengths, its CRS caused the array to have unequal dimensions. (206 lat x ...
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1answer
28 views
How to change projection in geoplot
I have trouble printing a map in Austrian Lambert projection.
I use matplotlib and geoplot. It all works fine as long as the shapefile has WGS84 (epsg=4326), or if not is set to these CRS (using file....
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1answer
23 views
GEE specifies scale in meters when CRS is geographic coordinate system?
GEE's ee.Image.reduceRegion has both the scale and crs parameter. The documentation says this about scale:
A nominal scale in meters of the projection to work in.
But if the CRS is a geographic ...
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31 views
OpenLayers MousepositionControl in decimal degree
In my webgis application, we are using OpenLayers 6 with projection 'EPSG:32643'. I'm using mouse position control to show the mouse position on the map. I want to display the mouseposition in ...
3
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1answer
49 views
Deformed shapes after using wedge_buffer as Symbol layer in QGIS
I'm trying to display "field of view" cones on the map, using Geometry Generator as Symbol layer:
wedge_buffer($geometry, dir, specs_angle, specs_distance/200000, 0)
"dir" : ...
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1answer
41 views
Buffering like set to lat/lon degrees but layer is set to UTM reprojection - EPSG: 32611
I have two line and point features to buffer. I have reprojected to UTM EPSG: 32611 for both.
Please, see screen capture showing the direct GeoPackage layer properties and not from the Layers window.
...
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1answer
31 views
How to write a custom Equidistant Conic projection with standard parallels at -30 and -60 N?
I'm super new to QGIS, so maybe I'm just missing something obvious, but when I try to georeference the raster of a regional map that I made in an Equidistant Conic projection with certain standard ...
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1answer
21 views
Coordinate Operations Error for NAD83(2011) Alaska Zone 1
I am receiving the following error below when running gdalwarp to crop an input orthomosaic in the NAD83(2011)-Alaska Zone 1 CRS. The command still runs and the output cropped TIFF file renders fine ...
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0answers
29 views
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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Map projection and localization in long distance operation
I work in the field of robotics.
When the ground robot was moving over long distances, we faced the
problem of increasing distortions when using UTM projection relative to the central meridian of the ...
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27 views
Google Earth Engine projection
GEE's documentation on ee.Geometry.Polygon says this about the proj paramter
The projection of this geometry. The default is the projection of the
inputs, where Numbers are assumed to be EPSG:4326.
...
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2answers
22 views
Translating custom coordinate system for MyCoordSysDefs.fme
I have a custom coordinate system that I was confused how to translate it to the MyCoordSysDefs.fme for use in Safe Desktop. Here's how it is represented in the prj file:
GEOGCS['GCS_ETRS_1989',DATUM['...
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1answer
33 views
Extracting intersection areas in R with threshold
I have two shapefiles. One contains distribution species maps(circle) and the other contains types of vegetation (A,B,C). I want to know what area of every vegetation contains which species. I tried ...
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1answer
68 views
Map lat/lon onto polar stereographic projection map based on two known points on map image
I've searched already everywhere but couldn't find anything. I have a "polar stereographic projection" map that is true at 60 degrees latitude north as an image (e.g. https://flightplanning....
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2answers
162 views
Measured grid in Mapbox
I’m trying to create a reference / measured grid in Mapbox so that each grid tile represents a consistent square shape. I know this square shape might not represent a consistent area.
Using long and ...
2
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1answer
58 views
Why does Google Earth Engine say calculating distance on sphere cause error proportional to the latitude difference
The documentation on ee.ImageCollection.distance says that
Distances are computed on a sphere, so there is a small error proportional to the latitude difference between each pixel and the nearest ...
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1answer
28 views
Proj4 string for USGS Bulletin 1532
I'm using an application that uses equations from USGS Bulletin 1532 (see source code - line 295: http://docs.ros.org/en/kinetic/api/robot_localization/html/api/navsat__conversions_8h_source.html#...
