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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13 views

Raster reprojection code not working in PyQGIS

I swear this used to work. I don't get any errors which is the confusing part- it just regurgitates the same layer in its original projection (in this case epsg 32630). Version of Q is 3.10 A corunya. ...
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14 views

Rasterio reprojection, changing pixel size: results in crazy pixel values

I'm trying to project a geotiff with 789x789m pixel size to 100mx100m using another geotiff as a template. Everything seems to work except that the output pixel values, shown when I open the file in ...
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20 views

On the calculus of joint-count test on no-full grid

I have a data points of presence-absence records and I want to perform joint-count test as it was suggested in the post https://gis.stackexchange.com/a/388939/178392 by calculating it on a grid (...
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QGIS - CRS for a fictional planet map (raster) - What am I doing wrong?

I have a procedurally generated DEM heightmap (1600px * 800px) showing an entire (fictional) planet in equirectangular projection (= equidistant cylindrical) that I uploaded in a QGIS raster layer ...
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1answer
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Testing spatial autocorrelation for presence-absence records? [duplicate]

I want to test the spatial autocorrelation for presence-absence data records, I know that the Moran's I test cannot be used here since I have categorical data. I was thinking about the join-count ...
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Difference in CRS when reading with read_stars und read_ncdf

I have a NetCDF file that I would like to load into a stars object. The two functions st::read_stars and st::read_ncdf both load it in, but the data ends up in different locations when I plot it using ...
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How to use a custom CRS in PROJ?

I want to change the CRS of a shapefile which uses EPSG:6257. Unfortunately, I am using Ubuntu 20.04 which comes with PROJ6. This particular CRS was only made available from PROJ7.2 onwards. So, I am ...
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Which projection is best when implementing regional datasets in a global one?

I have a question regarding the projection. I would like to set up an interactive atlas where the base layer is a global overview of e.g. peatland. In a next step, I would like to set into the global ...
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How to know which area lies in which projected coordinates system?

I am working in ArcGIS and I have calculated the slope which shows higher values which is unusual. I came to know about projected coordinates system. I am working on a lake located in Italy. How can I ...
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34 views

Scale Bar not appearing in meter-based CRS using QGIS

Students in my GIS class using QGIS 3.1 are having a problem that I can explain theoretically but not practically. Some students cannot get scale bars to appear in the map composer, even when bar ...
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30 views

Conversion to longitude/latitude

I am very new to GIS. I wanted to find out if it is possible to convert coordinates as specified in the table below to longitude and latitude c
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Create warped image for Google KML using WGS84 coordinates, Python

First a disclaimer, I'm not very fluent in GIS language and terms, so apologies if I use wrong terms etc. Task: A couple of years ago, I had the task of making image overlays for google, using UTM ...
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Define custom projection with small offset in QGIS

I have a series of raster maps of geophysics for an archaeological site in Turkey. These are ostensibly in UTM zone 35, WGS84 projection, but the surveyors set their grid with a total station using a ...
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Reprojection not working with raster even though properties say its in the correct projection

I have a raster file that keeps placing itself in the South Pacific Ocean, West of Peru. But it should be placing itself over Colorado. I have tried using the tool "Define Projection" in ...
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1answer
54 views

Problem transforming coordinates with PyProj

I would like to plot a marker using the Folium library but the data I have is in ETRS89 and Folium does not accept that projection. I am having problems transforming from EPSG25830 (ETRS89) to ...
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1answer
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Reading CRS and Affine transformation from a NetCDF with CF conventions

I have a NetCDF with geographical information. I'd like to obtain a GeoTIFF file with rasterio. The problem is how to translate the geographical information from CF standard to something that GeoTIFF ...
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Defining CRS with tifffile - export .tif

I am trying to figure out how to define/keep my images CRS throughout a splitting script I have written. I tried adding metadata={'init': 'epsg:3857'} when calling tifffile.imsave(dir_out, image), but ...
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Losing projection Infomation in standalone PyQGIS

I'm new to PyQGIS and I have been stuck with this for quite some time. I'm trying to run processing script in standalone PyQGIS. My script is working fine and giving the result that I want when ...
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26 views

R 4.0.4 Raster package treating Albers as unknown projection

I'm running a fresh R installation with RStudio. Installed packages are: library(randomForest) library(randomForestExplainer) library(raster) library(rgdal) library(sf) When I try loading any raster ...
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Map Projection for globe

I'm new to QGIS, and I'm wanting to export a world map that I can then project onto a sphere in After Effects. I'm just wondering what kind of CRS projection I would need to make the 2D map in, so ...
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1answer
34 views

Apply Grid Shift Transform file to GeoServer

Trying to apply a grid shift file to GeoServer. Have looked at the documentation but all it seems to say is to put the files in the user_projections, which I've done. I'm trying to use ...
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25 views

Choosing coordinate reference systems for esriGeometryPolygon in GeoPandas

I extracted a layer of parcel Geometry Type: esriGeometryPolygon and save as JSON, this is a fragment of one row of this JSON: { "attributes": { "OBJECTID": 171195, &...
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Python shortcut to find the distance between two coordinates points from different zones [closed]

I am trying to find the distance between two points on different coordinate zones. I am referring to this Measuring distances when crossing UTM zones? and don't understand anything from it.
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28 views

Raster reprojection from EPGS:4269 to EPSG:4326

I downloaded dem rasters for USA and they use EPSG 4269 CRS. Now, I want to sample raster values (elevation) at some points that use EPGS:4326 CRS. Do I need to reproject rasters to 4326 before ...
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Obtaining file path in QGIS Training Manual

6.2.5 Try Yourself: Convert Layers’ CRS ... 8. Repeat this process for each layer, creating a new layer in the vector_analysis.gpkg GeoPackage file with _34S appended to the original name and removing ...
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2answers
88 views

Calculating $area in project with multiple layers with different CRS in QGIS

I have a project with the CRS set to EPSG:31370. In this project there are a couple of layers, with a different CRS than the project CRS namely EPSG:4326 and EPSG:31370. Now I need to calculate the ...
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1answer
38 views

Using multiple workspaces in ArcPy

I'm a beginner in using arcpy, and having trouble with the following code. I have 2 different input feature layers in different folder. I would like to create a new gdb in the output_folder (this ...
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1answer
56 views

Intentionally increase coordinates in PostGIS geometry

I have a table with a geometry column (polygon) in a projected coordinate system in meters. Let's say, I want to shift all the polygons by some constant. For example, every point in all polygons must ...
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1answer
27 views

Substitute new CRS for one specified in the Training Manual, Module 6, Lesson 6.2.5?

This question came up on the page at the link https://docs.qgis.org/3.16/en/docs/training_manual/vector_analysis/basic_analysis.html. 6.2.5 Try Yourself: Convert Layers’ CRS Item 6. Change the [CRS] ...
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25 views

Projection issues with QGIS 3.16 Swellendam Training data

I am following this QGIS 3.16 training, following it exactly as shown (https://docs.qgis.org/3.16/en/docs/training_manual/vector_analysis/basic_analysis.html), using their provided training data. And ...
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20 views

Pdal and Earth Curvature/which EPSG

I am attempting to combine Lidar data that we capture using a scanner (which is real-world accurate) and USGS Lidar data. I am currently using Pdal and Entwine to download and reproject the section of ...
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1answer
44 views

Convert coordinates from EPSG 4326 to EPSG 28992 in PostGIS

I imported a CSV file with coordinates into a PostGIS table. This table contains a column "latitude" and a column "longitude". The coordinates in these columns are in EPSG:4326. ...
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Relationship between ECEF and WGS84

What’s their relationship or difference? I’ve read that WGS84 uses ECEF, but they can be converted between one another. If not mistaken, they are both geographic coordinate systems and not projected ...
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2answers
369 views

What is meant with EPSG:4326 projection

I'm pretty new to GIS and I've learned about both the geographic coordinate system, which defines a location on a 3d model of the world and the projected coordinate system to map this to a 2d surface ...
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47 views

Visualising NetCDF from Delft3D in QGIS

I have some results from a simulation in Delft3D that I'd like to visualise as a mesh in QGIS. For example, I'd like to see the change in water level at a different time step in the domain. The file ...
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1answer
38 views

Specifying a non-earth / unknown CRS

Occasional requirement to visualise arbitrary vector data in QGIS, adding features from Python. [understanding that they cannot be overlayed with any data on known projections] How can I specify ...
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1answer
51 views

Which coordinate reference system should I use to have more precision while calculating polygon area? 4326 or convert to the one specific to my area?

We are saving our drawn polygons in our database with the coordinate system 4326. The polygons drawn are all in Spain (where I came to find out the adequate coordinate system for Spain is EPSG:2062). ...
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Proper way to assign CRS in rgdal 1.5-23 [duplicate]

Perhaps my question has been already answered but if it did, I haven´t be able to find it. I´ve updated the rgal package to version 1.5-23 (GDAL 3.2.1 & PROJ 7.2.1) and when I run the following ...
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1answer
18 views

Exporting DXF in 1:1 Scale

I'm trying to export a parcel map as a DXF to scale. Initially I was having issues because my projection was set to WGS 84. I looked through the public questions on GIS StackExchange and learned that ...
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31 views

Can not load reprojected shapefile - GDAL Python ERROR 4

I've created a function based on the code snippet of the gdal cookbook to reproject a shapefile to a new crs. However if I try to load the reprojected shapefile I'll get ERROR 4: '...
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35 views

Reprojecting using ArcGIS Pro

Problems trying to reproject the DEM raster layer onto the city layer: The base layer (CITY) is using NAD_1983 StatePlane Georgia West FIPS1002 feet (WKID:2240) projected CRS with a geographic CS: ...
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Reprojecting in ENVI classic

I would like to reproject images in ENVI classic. The purpose of this is so that I can view multiple scenes in a uniform direction so that I can create an ROI and observe the differences in the ROI in ...
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1answer
42 views

How to use affine transform parameters in a PROJ or WKT2 string

Can anyone show me how I can construct a PROJ or WKT2 string with affine transformation parameters to create a custom CRS in QGIS? I wish to use the following affine transformation parameters to ...
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40 views

Georeferenced map lines up better with different CRS – why?

I have an old map that I'm trying to georeference. The map says that it's a Bonne projection, with the origin at 34ºN, 130º,30'E. I downloaded a DEM (in WGS84), and reprojected it using a custom Bonne ...
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ST_Buffer in meters from 4326 point table

I would like to create 100 meters circle buffers in a UTM projection from a point table whose SRID is EPSG:4326 and keeping the id column. I wonder what is the straightest way. Is that possible to get ...
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1answer
49 views

GeoJSON coordinates transformation to Web Mercator coordinates

I'm not sure how OpenLayers is converting the raw coordinates from a GeoJSON's geometry.coordinates property into a Feature's extent property. I can't really seem to find a lot of documentation on it ...
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3answers
117 views

Is it possible to figure out the projection used in a map?

I have the map below whose projection is unknown to me. It's a PNG image without metadata. It comes from a webpage that shows radar information for France. How can I figure out the projection it ...
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Georeferencing map with unknown projection and grid

It is another question about georeferencing a map with unknown projection and grid. You can find map here. As you can see it is already georeferenced, but poorly, I think. Projection used is ESRI:...
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1answer
45 views

r sp::CRS() returns NA

I just updated R (from 4.0.2 to 4.0.3) and all my R packages (previously updated about a month ago), and got an error in a previously working workflow on raster objects. It seems that it comes from ...
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1answer
53 views

sf::st_transform() gives “crs not found” error

I am using sf package version 0.9-6. I define a new object in ESRI:4326 and then try to reproject it to an Albers projection. I get an error, despite explicitly setting the crs when defining the ...

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