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

Finding correct EPSG with only given the extent

I was given two shapefiles with a CRS of EPSG: 3750. The two do not align over each other and I found that their extents are completely different. Shapefile "A" has an extent of 340235.445, ...
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Are there any mass-preserving raster projection algorithms?

Raster maps (e.g. as a GeoTIFF) can be reprojected using tools like gdalwarp. While these tools do a decent job to project images, they are not truly mass-preserving, i.e. the total sum of the values (...
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27 views

Reproject polygon from 3857 TO 4326 with R or QGIS

I am trying to reproject a vector from EPSG:3857 to EPSG:4326. The data is originally available as an ArcRestful API Canadian population tiles When I bring in the layer into QGIS and save it out as a ...
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1answer
75 views

How to know the scale of map in QGIS?

In QGIS I want to know how can I find the scale of a map. I have state boundaries with me, and when I calculate the length of the boundary, it comes out to be something like 245.854. This most ...
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1answer
77 views

Creating buffer for New Zealand map using QGIS

I am currently working on a map of New Zealand, and would like to put 100km buffers around some of my polygons. However, whenever I try to add a CRS layer in order to do it, the shapes just disappear ...
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24 views

Transforming to NED coordinate system

I’m working with a map that I've downloaded from OSM (EPSG:4326, using geopandas). Ideally, I would like to convert to a locally predefined NED (North-Ease-Down)/ENU(East-North-Up) coordinate system ...
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28 views

QGIS quits/disappears unexpectedly during the process applying reprojection on 40+ million record table

I have a vector grid table stored in PostgreSQL, containing around 50 million records. The process of reprojection starts and works for few minutes, then unexpectedly disappears without any message or ...
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27 views

How to properly convert from WKT to euclidean 3d points?

I am not a geoscientist (I do computer graphics), however I am trying to render some geospatial data encoded as a WKT file. I have a POLYGON with 2 coordinates per point, which seems to be ...
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31 views

QGIS 3.18 Reprojections result in wrong projection - EPSG 32754 instead of 7854

When I run a QGIS processing tool that includes a new projection, the result is not correctly projected. Instead of EPSG::7854 (GDA2020 / MGA 54), the data ends up with EPSG::32754 (WGS 84 / UTM 54 ...
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Identifying Vertical Datum in gdalinfo

I need help with identifying vertical datum on raster for a project that I am working on. When I run gdalinfo raster.tif, I can identify the horizontal reference system as given by the EPSG:XXXX. ...
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96 views

Reprojecting in PostGIS not working as expected

I just reprojected with PostGIS tree layers using this function: select UpdateGeometrySRID('schema', 'table', 'geom', 3857) These tree layers are contiguous. The problem is, when I open it on QGIS to ...
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32 views

Projecting TAB file in QGIS with an unnamed CRS

I am working in QGIS and noticed that some of the layers I am using are incorrectly located. The layers in question are TAB (MapInfo) files which I have dragged in, superimposed on to satellite ...
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Transform pixel-coordinates from input image to pixel coordinates in output image

How can I transform pixel-coordinates from input image to pixel coordinates in georeferenced output image? I want to georeference images (frames of a video) with GDAL and GCPs. But besides the ...
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28 views

Image cropping with rasterio.mask results in tilted images. Caused by data EPSG?

I'm currently facing a problem with my image cropping service. I'm trying to crop fixed-size images, with input geometries generated from slippy map tiles. But the output images are often tilted, here ...
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29 views

Adding relative spherical coordinates to absolute Lat/Lon/Alt coordinates

I have an absolute position of an observer given in Lat/Lon/Alt (on earth, ellipsoid). The observer observes an object and measures azimuth (angle), elevation (angle) and range (NM) to this object ...
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1answer
36 views

Coordinate conversion using Python and filename

I'm trying to create a Python function to recognise which coordinate conversion to execute based on the last part of the filename - either BNG for British National Grid or ```IG`` for Irish Grid. The ...
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1answer
35 views

Creating a georeference in coordinates with a (0,0) origin in QGIS

I am new to GIS (and QGIS which is what I was intending to use) and I had a general question that will help me decide whether I can even go about this task with these tools: I am working with some ...
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Boundary system for GPS tracking [closed]

I have not much experience in GPS coordinates and I would like to make a GPS tracking device that tells me if I am inside or outside a specified border. I would like to implement it into an Arduino if ...
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Use ModelBuilder to project rasters from 600 folders into subfolders in each folder

I have 600 folders, each folder contains a raster (IMG) and I want to project each raster from one coordinate system to another and generate new folder in the source folder to contain the projected ...
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2answers
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Masking raster with a multipolygon

I have a .tiff and a multipolygon as a .shp. Both have been exported from QGIS using the same CRS (EPSG:3857). I load in the shapefile using GeoPandas and the TIFF using Rasterio. Then want to use the ...
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1answer
34 views

Changing projection changes area when calculated in R

I have a raster with pixel values 1- area of interest and NA-not an area of interest and hence excluded completely. This raster has CRS WGS 1984, with no projection assigned to it and has resolution ...
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1answer
42 views

QGIS CRS WGS 84 problem with the scale and measurement

I have a problem with my map scale. It shows 0:1 instead of proper scale. I am not capable to make any measurements, as the values go wrong. When I click on the measurement tool I get an error: This ...
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Georeferenced images in ArcGIS are projected wrongly in QGIS and other GIS

I am working on a big project that includes georeferencing over 850 historical maps in the Netherlands. We're doing this with a small team, with each of us taking certain municipalities. Since we all ...
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40 views

Pyproj returns inf when coordinates are inside bounds

I'm trying to parse the data from GHSL-POP, converting coordinates to real-world latitudes and longitudes. But pyproj returns inf value for some coordinates that are inside bounds. Here is my code: ...
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34 views

How to list all CRS names and IDs in QGIS Python API?

I want to get these two lists from QGIS in py plugin/Python interpreter code: How to do such a thing in QGIS 3.18?
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1answer
43 views

Custom datum transformation in bash or Python

I need to transform a shapefile from Deir ez Zor / Levant Stereographic (EPSG:22780) to UTM 36N using 7-parameters Helmet transformation on Ubuntu bash script or Python script. In ArcGIS, I can ...
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4answers
524 views

Showing the bounding box for every coordinate system in QGIS

I'd like to visualize where every coordinate system in QGIS is in the world. I can see the bounding box for them when I go to QGIS and select coordinate system: But I'm trying to figure out how to ...
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35 views

How to set default layer coordinate system into geographic coordinate systems (-180-180, -90-90)?

I want all my global layer to calculate extent in terms of geographic coordinate systems like this: For example not to get GRASS errors like Invalid north field: 7191040N automagically. Where one can ...
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22 views

How to clip a point-based file with shp or polyline [closed]

I've got a CSV file containing the population census of Germany on a level of detail of 100x100 meters, so an awful lot of points. I need to clip just a small area containing all the points that lie ...
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23 views

Changing UTM Coordinates between zones [closed]

How can I convert the UTM coordinates between different zones? For example, I need to convert the coordinates from Zone 43 P to 44 P.
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3answers
535 views

Why some CRS are deprecated in QGIS?

I tried to specify the Pulkovo 1942 / Gauss-Kruger 13N (EPSG:28473) CRS for my QGIS project. But it is deprecated. I have never seen such issue before. Why it is deprecated? The QGIS version is 3.6.3
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How to raise an error that coordinates are out of raster bounds (rasterio.sample)?

I have some rasters from sentinel-2 mission that I'm working with. I'm using rasterio sample module , list_of_coords is just a list containing 3 random points but only 2nd is within the raster bounds: ...
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1answer
21 views

How to define a Gnomonic projection WKT for the Moon

I need to warp a global dataset into a set of 6 rasters to form a cubemap for rendering the Moon. These rasters must be in Gnomonic projection in order for the rectangular raster bounds to line up ...
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17 views

Python code to recognise and convert from CRS [duplicate]

I have a Python function which converts Eastings and Northings to Latitude and Longitude These Eastings and Northings are given in CSV format like so: Name Easting Northing The python code is then ...
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10 views

Viewing TPW HDF4 (HDF-EOS4) Files in ArcGIS

I am trying to view TPW (Total Precipitable Water) data from HDF4 (HDF-EOS4) files in ArcMap. The datasets changed from HDF4 to NetCDF in mid-2019, I have no issues viewing the NetCDF files. I have ...
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26 views

Using Python to convert from more than one CRS [duplicate]

I have a Python function which converts Eastings and Northings to Latitude and Longitude if line_count == 0: keys = row print('keys', keys) ...
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38 views

How to “unravel” a polar continent (i.e. Antarctica) from azimuthal projection and convert it into equirectangular?

I have very recently gotten into cartography and map projection, and I wanted to visualise the map from Avatar: The Last Airbender into a proper equirectangular map. Here is the map for those ...
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16 views

How to project many shapefiles in ModelBuilder using logical “If coordinate system ” and Project tool

I have few line layers. Some of them have the wrong spatial reference. How to iteratively check the coordinate system of several layers and then transform the layers with the wrong system into the ...
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27 views

Lunar Reconnaissance Orbiter (LRO) stereographic projection transformation equations issues

I have been trying to figure out the coordinate frames the Lunar Orbiter Laser Altimeter (LOLA) team uses for data. In their dsmap_polar.cat file they state: where λ is the longitude and X and Y are ...
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1answer
30 views

Convert NLCD 2016 Raster to Vector

My goal is to create a .shp file in CRS EPSG 4326 - WGS 84 of land cover data for several counties in California. My idea is to use the NLCD 2016 dataset in QGIS to convert it into the desired ...
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1answer
41 views

How to change the projections of a new raster

I tried to make an algorithm in Python where I entered a georeferenced raster (EPSG 32722 projection system), all its NaN values ​​were transformed to zero, and then a new image was saved with the ...
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1answer
63 views

MODIS Terra Chlorophyll data in R inconsistent with latitude / longitude coordinates

I'm working with MODIS Level 2 Chlorophyll data in R. Specifically, I'm analyzing Chlorophyll data offshore of the Channel Islands, particularly around San Nicolas Island (SNI). The data are publicly ...
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18 views

Meridian Convergence in UTM and Gauss Kruger Projection system?

There are points where geographic coordinates (latitude and longitude) are known. I have calculated the UTM (Universal Transverse Mercator) projection coordinates of these points and then I want to ...
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33 views

Calculating area and projection using QGIS

I am facing problem calculating area and projection in general, using QGIS 3.18.3. preface: I am using EPSG: 32643 projected CRS. I aim to compute area and the result is fine correct in this image. ...
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1answer
18 views

Assigning CRS to NetCDF (.nc) files in QGIS

I downloaded some land cover maps from Copernicus. I was able to load the .nc layers into QGIS (3.18.3, Windows64) where they displayed correctly, but no CRS appeared in Properties and I was unable to ...
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1answer
33 views

How do I change the buffer units from degrees to meters for my CSV layer in CRS EPSG 4326? [duplicate]

I'm trying to add a buffer to a CSV layer, in QGIS, which is overlaid onto an OpenStreetMap layer but I do not know how to change the units from degrees to meters. I've tried to change the CRS to EPSG ...
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60 views

Creating lower 48 states county map in style of NY map using ArcGIS Pro

I have bumped into the following map (Figure 1) of NY state and similar ones in other contexts. I would like the software to create a map in the same style, not just of NY state, but of the lower-48 ...
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1answer
35 views

How to transform OpenLayers coordinate projection

I have a function where I calculate the coordinates of the bounding box: map.on('moveend', function (evt) { let bbox = map.getView().calculateExtent(map.getSize()); console.log(...
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24 views

How can I plot a Kernel Density Estimation in a projected coordinate system in Python?

I am trying to plot a Kernel Density Estimation calculated from a geopandas GeoDataFrame in UTM. I am using sci-kit learn's KernelDensity, because other implementations don't allow for much ...
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24 views

Preserve geography when copying features in QGIS [duplicate]

In QGIS 3.16 "Hannover", copied vector features appear near grid 0.0, at coordinate numbers that are the long and lat values. The attribute table with desired fields is updated as expected. ...

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