# 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 deal with .LAZ files that have wrong coordinate system in header? [closed]

I have been given a bunch of .LAZ files that had the wrong coordinate system applied in their header, so the coverage grid shows up skewed and I am trying to correct the issue to work with the files ...
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1 vote
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### How to convert lat/lon to x/y in Lambert conformal conic projection using Python

I am trying to convert some lat and lon to x and y with projection Lambert conformal conic. I am trying the Python package pyproj for that but getting the wrong values. The issue is that the ...
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1 vote
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### Map distortion and the difference between the Orthographic and Stereographic Azimuthal projection

I am new to the topic of maps and distortions and am a bit confused about the effects of conform and no-conform maps. Taking as an example the Azimuthal projection: I have read that with the ...
• 11
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### How to compute weighted centroid of lat+lon points taking into account spheroid

I have a bunch of points (lat+lon coordinates). Each one has a weight. I would like to get a weighted centroid of the points, taking into account the spheroid (as my points are scattered across the ...
• 135
1 vote
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### GDAL coordinate transformation not aligning with QGIS coordinate transformation

I have a raster being changed from EPSG:27700 to EPSG:3857 coordinate reference system. Within the QGIS application, I have found this coordinate transformation to fit the best I've tried to ...
1 vote
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### Creating custom initial projection in GMT/GDAL

I have a number of images which I need to project into the standard IAU 2000 lunar coordinate system. Each is defined in terms of an oblique cylindrical projection, and I am given the rotation pole/...
58 views

### Curved labels along parallels in different CRS / map projection (QGIS 3.4)

I'm trying to make curved labels based on map projection. As in these examples, I would like labels for point layers to follow parallels. Is that possible in QGIS 3? Or a labeling style like this: ...
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### Line has been split, total line is different from unsplit line using ArcGIS Pro

In ArcGIS Pro, I've done a intersect on a line based on an area boundary. When I compare the length of the intersected lines, it should equal the length of the original line. However there is a slight ...
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### R SQL importing Polygon errors System.FormatException: 24119

Any advice here from you all. I am converting a .kml file in R and uploading the data to SQL. I am pulling data from here: https://www2.census.gov/geo/tiger/GENZ2021/kml/cb_2021_08_tract_500k.zip ...
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### Error: Projection: The CRS of a map projection could not be parsed. (Error code: 3)

I transferred the image I exported from Google Earth Engine to QGIS. I am getting projection error in my work. Anyone have an idea about this? When I want to export in WGS 84 EPSG:7030 I get the error ...
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### Sentinel L2 WV - Envisat WVS product are defocused?

I would like to apply the methodology from this paper : Measurement of 2-D Sea Surface Elevation Fields Using Complex Synthetic Aperture Radar Data. However, looks like one important step is that the ...
37 views

### NetCDF file and shapefile in wildly different locations and of disproportionate sizes when projected with the same CRS on QGIS?

I am trying to map global greenhouse gas emissions data from the European Commission's Emissions Database for Global Atmospheric Research (EDGAR) and Northern Arizona University's Fossil Fuel Data ...
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### Maps not overlapping

I need to Georeference a map which is given in .jpg format. I reference the map using QGIS Georeferencer. The Georeference was successful and coordinate system was saved to WGS 84/UTM Zone 56s EPSG:...
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### Application of A* using openrouteservice

I'm new to using GIS and would like to know is it possible to implement an A* algorithm using openrouteservice? I need to find a route between the source and destination that encounters a large number ...
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### Converting projection in lat lon to pixel x y

I'm looking at a map at https://stephanwagner.me/create-world-map-charts-with-svgmap#svgMapDemoGDP I think it is a Robinson projection but am not sure given that Antarctica is missing. Is there a ...
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### ETOPO1 ice sheet GeoTIFF not reprojecting (or appearing for that matter) in Albers conic equal area north Asia [closed]

I am new to and using QGIS for my own amusement. I downloaded the grid ice sheet GeoTIFF from ETOPO1 and want to reproject the file to Albers north Asia conic. But every time I do that the image ...
1 vote
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I am trying to extract some bands from a .nc file. I don't know the file projection (if there is one), thus I created in GRASS GIS a newLocation with no projection (just a XY Cartesian plane) and ...
1 vote
46 views

### Eliminate mismatch between building images and their shape file annotations

I have little experience with geospatial data processing. I have a satellite image of an area (a geotiff file) and building footprints (building annotations) for this area (a shape file). When I open ...
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### Warning inconsistency extent - extent is incorrect

I have a file I got from someone made digitized in QGIS it shows the coordinate system as GCS WGS84 but the extent values are bizarre. When I open in ArcMap it says warning wrong or inconsistency ...
1 vote
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### Project Mercator coordinates at a specified zoom level in Mapbox GL JS

I am struggling a bit moving from Leaflet to Mapbox. I have geojson with coordinates like [68100095, 100779149], which I am told are Mercator x/y coordinates at a zoom level of 20. This is how the ...
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### What is a source of Proj projections definitions?

I'm trying to create my own implementation of most popular projections (for reasons unrelated with GIS). But I want my implementation to be as compatible with Proj as possible (because it is an ...
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### QGIS - Does the Coordinate reference systems of two vectors/shapefiles matter if they are the same or not? [closed]

I have two polygon shapefiles. It says in the information properties that the CRS IS EPSG 4326 and the other one says the CRS is a custom one (I put this custom one). Since these are shapefiles, ...
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### Upon ArcMap data layer Reprojection, data is not lining up [duplicate]

My data will not line up after reprojecting into the coordinate system I am trying to match with another. I have an existing layer called AA_Cities and a newly downloaded shapefile called ...
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### Output raster of rasterio.mask doesn't match CRS of input [closed]

I'm trying to mask a raster with population data with my area of interest. I reprojected the original population raster according to the AOI's crs, but after masking and writing the new file, the crs ...
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### Extent of a proj4 string

I have a custom proj4 string in which my data is represented in Cartesian local coordinates. The example proj4 is below. +proj=tmerc +lat_0=44.155877943 +lon_0=141.655514872997 +k_0=1.000004976 +a=...
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### Using a grid reference to convert to lat/lng

I have a set of coordinates of the form 35KNLXXXXXX where the Xs are numbers e.g. 35KNL192274 and are in relation to Binga SE-35-7 Edition 3 and of the scale 1: 250 000. I found the relevant map here ...
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1 vote
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### CRS to use for computing distances between points on global scale with GeoPandas

I have a global coastline grid made up of polygons (hexagons) and I am trying to aggregate global data onto these hexagons. For example, I am trying to compute the distance of each hexagon to the ...
26 views

### gdal2tiles.py Differs from Original Raster

When comparing in QGIS the output of gdal2tiles.py to the raster from which the tiles were generated there is a clear difference. In this image Pink is the gdal2tiles.py output, green is the original ...
23 views

### ipyleaflet area of drawn polygon

I am trying to get the area of a drawn polygon in ipyleaflet with geopandas...but kind of cant get a propper result. from ipyleaflet import Map, basemaps, DrawControl, SearchControl m = Map(basemap=...
44 views

### EPSG:3857 to UTM?

I am trying to convert coordinates from EPSG:3857 Spherical Mercator to UTM local projection. The problem is that for my use case I cannot use any web interface or library, I should implement the ...
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1 vote
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### QGIS: Set CRS for vector tile

All vector tile sources that are supplied in EPSG:3857 WGS/84 are projected fitting to other layers, even when converted to other CRS using on the fly projection. There is a vector tile source that is ...
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1 vote
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### Setting the right projection for a georeferenced PNG image

I have been trying to georeference an image I downloaded from Google API. Here is how I approached it after many unsuccessful attempts: I calculated the coordinates of the corners using this code. I ...
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### Move layers from a qgis project to an other

I was working on a non georeferenced qgis project and when I tried to drag and drop the layers from this project to a new georeferenced raster layer the other layers didn't show up. Some notes: The ...
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### Ordering/arrangeing shape polygons by size, without a CRS

I'd like to use QGIS to order/arrange polygons (or ideally, clipped rasters) from a map by area, to create an infographic diagram like this one I found online (sourced from https://www....
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40 views

### Using layers with different CRS in Intersection tool of QGIS

I've always thought that to intersect two layers, they needed to have the same CRS. Today, I tested the Intersection tool to intersect layers with different CRSs, and I was surprised to see that it ...
• 21
1 vote
44 views

### "ERROR: Unable to initialize coordinate transformation" when reprojecting from one CRS to another CRS in a different mapset

I am trying to reproject a global raster (this: https://sedac.ciesin.columbia.edu/data/set/wildareas-v3-2009-human-footprint/data-download, I named it HFI) from Mollweide (its projection) to LAEA3035 ...
23 views

### Calculate length using GeoPandas

I have a shape file "Line1.shp". It has only one feature. When I calculate the length in ArcGIS Pro using "Calculate Geometry" and selecting units as "Meters" and ...
36 views

### Change map projection in Leaflet

I'm using leaflet in my current project. As a map sourse Leaflet consumes json-file with coordinates in WGS84 EPSG 4326. <l-map ref="myMap" :zoom="zoom" :...
49 views

### Making Rasterio read CRS directly from PRJ file when CRS missing from metadata but present in PRJ file

I'm trying to read a Raster file (GeoTiff) using Rasterio/Python. The file has fully populated metadata, but no CRS projection. This is present in a separate PRJ file (other files included are .aux ...
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### Display raster from geoserver through openlayers using "xyz"

I'm trying to display some raster images hosted from geoserver using Openlayers. Following this example from openlayers website, it seems I could achieve it by consume the data through "xyz" ...
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### Define raster resolution in UTM or Lambert Azimuth Equal Area projection

I want to create a raster grid in Lambert Azimuth Equal Area projection. I need to work within the raster and sp packages, and I need to work in LAEA projection. However, when creating my raster, my ...
1 vote
54 views

### Converting X/Y coordinates using pyproj giving incorrect results

I have two CSV files which I have to merge and the only thing common I found was one of them has coordinates of six points for polygon. and the second file has x, y coordinates which is the only ...
1 vote
21 views

### Assigning local CRS to space telescope imagery? [closed]

Since the new images became available from the James Webb space telescope (https://webbtelescope.org/resource-gallery/images), I want to test some of my favorite classification, segmentation, and ...
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### Shapefile with different NAD83 zones

I have a shapefile with zone 17 and 18 as content, and zone 18 as coordinate system. When using coordinates of zone 17 there is an error. What to do?
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I'm using Google My Maps for a project that requires users to find a particular site and then send me the coordinates of that site. However, a "published" Google My Maps doesn't provide the ...
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### Orthographic Projection of Mars (MOLA) in QGIS - Visually correct results, wrong coordinates

I am trying to reproject the coloured shaded relief map of Mars (MOLA). After many tries, I got an orthographic projection of the scene centred on the pole, however, the coordinates are wrong. I ...
75 views

### Is there any way to get the information in XML, or GeoJSON or in any text format for this ArcGIS from URL?

I have a URL like this https://arcgisserver.lund.se/arcgis/rest/directories/arcgisoutput/extern/Extern_Stadsplanering_MapServer/_ags_mapd3b02fb986704186a28a270abd0baff1.png Source Page https://...
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### Blank tiles near borders of shapefile

I've generated a tileindex (.shp file) of some COG files using gdaltindex. However, when loading the shapefile through MapServer in Leaflet, some of the tiles seem to go blank partially when zooming ...