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.
8,343
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Different UTM limits
Why is there a difference of 4 degrees between the UTM North / South cut-offs?
One might expect the North and South UPS grids to be symmetrical in coverage but they followed the UTM decision to stop ...
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23
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Which method to calculate distance from coordinates
I have a project to know the distance between two points (Long, Lat).
The web app uses openlayers (CRS from 4326 to 900913).
I have written a jupyter notebook to check the distance in python.
https://...
4
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32
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QGIS hexagonal grid size specifications
I am trying to understand how grid size/cell size is calculated while using "Create Grid" function in QGIS. According to https://docs.qgis.org/3.34/en/docs/user_manual/processing_algs/qgis/...
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36
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Reproject large raster using Python
I have some large rasters that I want to reproject in a memory-safe way, using a second raster as a template . This code works nicely for smaller ones, but when they are large the Python kernel ...
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1
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36
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Coordinate conversion from Cape Datum to WGS 84
I am working with old borehole coordinates in the Mpumalanga region in South Africa. I suspect the coordinates are referenced to Cape Datum (Clarke 1880) before the Hartebeesthoek 94 datum was ...
3
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1
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37
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Problem with axis order in WFS with QGIS
I'm attempting to make use of some data from the Scottish Government's WFS server. But there is an axis order issue, I just want to check that it isn't something I've done before I raise an issue with ...
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24
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Set projection with GDAL and Python of a raster file
I have the following script that allows masking pixels below a certain threshold for all TIFF files in a directory; the user should specify the path, the threshold, and the bund number. The output ...
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1
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39
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QGIS - Unknown projection of Excel-based data
I have a database of coordinates of which the projection is unknown and I have to find out what it is. The coordinates are metric (so for example lat 388749, long 5014908); and they should refer to ...
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12
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Projection failing for NetCDF file using NetCDF4 in python
I am trying to create a netCDF file from an excel sheet that contains precipitation data. The excel file is organized with latitude and longitude in columns: a column with latitudes, a column with ...
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22
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Gott Goldberg Vanderbei projection using R
I want to know if it is possible to use R to generate a double sided disk projection discussed in https://arxiv.org/abs/2102.08176v1 . I am not familiar with GIS softwares but comfortable with R. ...
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1
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32
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Selecting the right CRS for a KML file in Jupyter
I'm working with Ipyleaflet to display a KML file in a Jupyter Notebook
I have the following in a cell:
import fiona
import geopandas as gpd
from ipyleaflet import GeoData, Map, basemaps
fiona....
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17
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Google Earth Engine modify resample resolution units
My initial goal is to process the global GEDI 10m resolution canopy height data for 2020. I used a loop to cut the original image into 20° x 20° tiles and used convolution kernels to average and ...
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35
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Choosing projected coordinate system for Pennsylvania
I need to run some spatial analysis on a map of PA counties but I noticed there are two different State Plane systems (North and South).
Which one should I use?
In PA state/local GIS, which one do you ...
4
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2
answers
44
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OSGeo / PROJ - TransformerGroup Ordinality
My question is within the context of working with pyproj, the popular python package wrapping OSGeo's PROJ library, but it probably spills over into coordinate transformations as a whole and ...
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36
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Misaligned coordinates
I am new to QGIS, and have just uploaded my first raster layer, plotting ecological data in Africa.
However, I noticed that points above and below the equator appear shifted (see image). My CRS is ...
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35
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Converting latLng to screen point
I have a map in RN app on iOS and I have and overlay outside of the map
Inside overlay I need to draw a View with some absolute position that will match some LatLng coords on the map
I know screen ...
2
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1
answer
115
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Is this KML file measured in degrees?
I'm working with a KML layer in QGIS. Here is the file:
The KML file:
<?xml version="1.0" encoding="utf-8" ?>
<kml xmlns="http://www.opengis.net/kml/2.2">
<...
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1
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18
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Calculating area percentages of another vector file based on vector grid using ArcGIS Pro
I have a grid (vector file) in ArcGIS Pro, and I want to calculate the percentages of the area of different anthrome types in the other vector file (Anthromes 12K DGG Dataverse) for each grid cell. I ...
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46
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User defined transformation in QGIS
Is it possible to define custom transformations within QGIS, such as for user-defined CRSs? If this cannot be accomplished directly through the graphical user interface, might there be an alternate ...
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1
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18
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r.out.gdal exports raster with projection but without extents
Exporting raster with r.out.gdal with PCRaster driver gives two files - .map itself and .xml with projection and colormap. But... I can't find the information about extent. Projection is EPSG:4623 (...
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25
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QGIS Coordinate System in Layout manager does not work [duplicate]
When i am trying to set coordinate system to my project it does not show the proper coordinates of the area. I never had this problem before, can anybody tell me how I can change this? I always used ...
3
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3
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281
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How to define (not reproject) a CRS of a shapefile in QGIS?
I have a shapefile which comes with a wrong CRS and I would like to redefine the projection, so WITHOUT applying some transformation on the coordinates.
In ArcMap you can do this with the 'Define ...
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0
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55
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Deriving geocoordinates from objects on side-view drone image
I have the following metadata of drone images, that were captured at an angle: yaw, tilt, roll, absolute height, relative height, focal length, and the coordinates of the drone every view seconds. Is ...
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16
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To project CRS or not (Is Karney geodesic distance as good as projecting and then using Euclidean)
I'm used to using GeoPandas where I open a file which is usually in EPSG:4326 and then projecting it using to_crs so that when I do any area or distance related calculations, they won't be distorted (...
3
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1
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80
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Leaflet offset of tiled layer WMTS layer
Adding in Leaflet a WMTS layer with the 'L.tileLayer' to a COG Tiff results in an offset. Both services are in the same EPSG:2056 system
This code
<html>
<head>
!-- Version 2.0 --> &...
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21
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Reprojecting ASTER data (09XT) in ArcGIS
I have downloaded ASTER 09XT dataset which, when opened in ArcGIS, shows the datum as 'not specified based on GRS 1980 spheroid'. I tried to reproject the data in ARC 1960 and WGS84 datum. However, it ...
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0
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30
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Leaflet maplibre gl use custom CRS
I need to use CRS 2056 with leaflet and maplibre leaflet-maplibre-gl.js to display vector tiles.
Using this code
<html>
<head>
!-- Version 3.0 --> <!-- full stretch -->
&...
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0
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80
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QGIS ellipsoidal area values changing very slightly between calculations while planimetric values stay the same
I have a number of vector shapefiles that I need to calculate the geodesic/ellipsoidal area for. These shapefiles are accessed and updated regularly, with the area recalculated each time they are ...
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28
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QGIS Australia GDA94 to 2020 Transformation File (NTv2_3>
I'm looking to convert some Australian GIS data from GDA 94 to 2020. The reprojection exists, but I need to use a particular transformation - specially NT v2_3 Conformal (this exists in ESRI). I ...
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1
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29
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ArcGIS Arcade return x coordinate of web map feature from EPSG: 3857 to EPSG: 2227 [closed]
I'm using smart forms in ArcGIS Field Maps and I need to calculate the x coordinate in the feature layer's original coordinate system (California state plane III, EPSG:2227) when a new feature is ...
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1
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46
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Develop ECEF rotational matrix from NED aircraft yaw, pitch, roll
My goal is given an aircraft's latitude, longitude, altitude, yaw, pitch, and roll all in a NED coordinate system, produce a EFEC X,Y,Z location of the aircraft along with a 3x3 rotational matrix ...
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1
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55
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Is it possible to make a map projection where one area is comically large and in the center, and the north/south has rotated a bit? [closed]
I am looking to create a humorous world map projection where one location that is about 13 miles long and 3 miles wide is huge and takes up the entire middle of the map, with the rest of the world ...
4
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1
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116
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"Could not load source layer for INPUT" error when reprojecting flt-file with PyQGIS
The data I have are ESRI Floating Point Data (so they are a raster type). The path I provided is a fake path, so that I don't show my real system paths.
I know that my code works with vector data, as ...
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36
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Plotting XY coordinates obtained from Google Maps
I know how to plot XY coords in ArcMap—right click the table, plot XY, select geographic coordinate system (coords are in degrees), etc. My question is rather when selecting the GCS I always go with ...
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48
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Reprojecting layer from Gauss-Krueger to epsg:25832 (with example file to try)
I have a file which, when opened in QGIS, is shifted and has a lot of tarball-conversions suggested. However, none of them works correctly, meaning, when I load the data into qgis, then adding a ...
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1
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38
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Projection of CMIP data
How to get the spatial projection from NetCDF file in Python? I am working with CMIP6 data.
2
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1
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91
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Selecting metres when using QGIS Points Along Geometry [closed]
I'm new to QGIS and have been trying to add points every 10m along a track using this older thread as a guide: Auto generating waypoints to a GPX file along track (hiking path - not as crow flies)
...
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50
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Strange pixel column numbers in imported GeoTIFF file
I am loading a .d file (from SAR ceos file) with 11,000 pixels x 11,000 columns into QGIS 3.16.4.
Perhaps this is a funny input format (not sure) but it appears that QGIS loads it well but reprojects ...
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12
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How can I export all the data from an image collection and add the coordinates as a band
I have a collection of data to which I apply several filters, when I try to export the coordinates of the remaining data after applying the filter, ALL THE COORDINATES appear, I only need the ...
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1
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26
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Proj Oblique Mercator two-point method very useful?
I am happy with Proj oblique Mercator Azimuth (+alpha) method,
but I am also itching to try the two points method. But just like
@ralph-tee showed in https://gis.stackexchange.com/a/337169/77230 ,
the ...
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0
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34
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Why do bmp files plot in wrong spot in QField?
I'm relatively new to QField and have successfully packaged a project to QField. However when I opened it, most layers have displayed correctly except for some bmp layers - these have plotted in the ...
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33
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How to get crs_description from EPSG-Code?
I'm searching for an expression in QGIS to get the description of a CRS
Assume I have following table:
Area
EPSG
desc
A1
EPSG:31258
A2
EPSG:31255
Now I want to fill in the "CRS-Description&...
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3
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71
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After converting CSV file to polygon, polygons are not falling on correct location
I have a CSV file with records in below format.
area
confidence
boundary
159.1512
0.8084
POLYGON((87.7185491791352 22.5667828312016, 87.7184590804737 22.5667864311825, 87.7184519272495 22....
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1
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69
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PyQGIS: Transform Lat-Long CSV into a UTM project
I have a UTM project in QGIS and need to import some CSV files that are in Latitude Longitude format. When I import it using the GUI, it knows that it is in CRS: 4326 and does a ballpark reprojection ...
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0
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17
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Soil moisture index from European drought observatory
For my current task, I am using the soil moisture index data from the European Drought Observatory. In the download section, the data is natively provided in the Lambert Azimuthal Equal Area ...
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1
answer
50
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Shoot a point from another point
How do I shoot a point directly north 3,000 feet from the corner of a polygon in ArcGIS Pro in WGS 1984 Web Mercator (auxiliary sphere)?
I start by going to Edit --> Create and choose Point at End ...
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1
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72
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Defining “Unknown Coordinate Systems” for converting from ArcMap to ArcGIS Pro
I’m helping my organization convert from ArcGIS Desktop 10.8 to ArcGIS Pro 3.2.
We have a local site-specific X, Y, Z coordinate system, in engineers feet (feet in tenths), based on a main datum (...
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45
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Setting custom CRS using PyQGIS
I have a PyQGIS-script which reprojects to EPSG:25832. However, it needs some adjustments in the false_northing and false_easting parameters, therefor I tried to create a custom CRS with adjusted ...
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2
answers
91
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Reprojecting to EPSG:25832 using PyQGIS shifts layer
I have a shapefile with the following CRS specified in the prj. file, and I think it is ESRI:31493 :
PROJCS[
"Germany_Zone_3",
GEOGCS[
"...
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0
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23
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Translating (cropping) a GeoTIFF file to a specific extent but ending up with a different final extent
I'm trying to crop a larger GeoTIFF file to a smaller extent.
The darker GeoTIFF file in the middle has the extent I want to reproject to. I've used the following command to do the translation:
...