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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6 views

Why does my rgdal discard datums?

I'm using rgdal to process rasters and shapefiles that contain CRS information [CH1903+ LV95 (EPSG2056) or CH1903 LV03 (EPSG:21781)]. For some reason part of the CRS information is always discarded (...
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NAVD88 not in Vertical Reference drop down list of Drone2Map

I use the Propeller company's Aeropoint GPS tiles to collect ground control for drone flights. When trying to import my ground control points, the survey report provides the coordinate reference ...
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31 views

Is it possible to fix Quick Maps layers not displaying properly when zoomed out in WGS84 in QGIS?

I often want to display some global point or polygon data over a base layer, to provide some context. Quick Maps layers like OpenStreetMap are handy for this, but these layers are usually in EPSG:3857,...
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68 views

Cannot get projection from raster dataset using .GetProjection()

I can't figure out how to get the projection info from a raster file using gdal. I thought my raster had a bad srs so I used a script from # https://gdal.org/tutorials/raster_api_tut.html to create a ...
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Converting GPS Coordinates to work with Arctic Stereographic basemap using ArcGIS Desktop

I have a bunch of GPS coordinates pertaining to sampled sites around the arctic and I am trying to display them in ArcGIS Desktop on an Alaska Polar Stereographic projection (WKID 5936) basemap. I can ...
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34 views

Define a projection for LAScatalog chunks using the lidR package in R

Using lidR::grid_metrics with a LAScatalog is it possible to use a second projection for the processing "chunks" such that the resulting raster cells align with a raster image (sentinel 2)? ...
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47 views

Buffer line between two coordinates with meters

I am trying to build a polygon (with long/lat coordinates) over a line between two points (long/lat as well). Basically what I used is line buffering with meters as an distance. However I have noticed ...
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33 views

Raster becomes invisible after changing CRS in QGIS

I am having trouble displaying this netcdf file in QGIS. The file holds u and v components of wind data from NCEP Climate Forecast System. When I load the data, it displays over the ocean near Africa ...
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14 views

Change Projection of a Web Mercator PCS to rotate it around center

I am using the GIS tool SharpMap together with ProjNet(4GeoAPI) as a tool to switch between CRS and transform coordinates (This information are just for context; my question is more abstract). The app ...
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38 views

Determining CRS for contoured road map of England and Wales

I've been working with some old maps lately [1800-present] and I've had some difficulty identifying CRS/projection. This map has this written at the bottom. Based off of this, how can I find what ...
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31 views

Slope Analysis with Python

I am trying to perform a slope analysis using Python and GDAL. The DEMs have a CRS of EPSG:4269 which is NAD83 and a geographic coordinate system. Previous attempts to perform a slope analysis ...
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30 views

Changing projection back and forward correction

I Have an orthophoto which is set on a local CRS (EPSG:2039) I also collect data with a WGS84 Application (Fulcrum) In order to use the orthophoto in the app I had to reproject it from the local CRS ...
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Using QGIS to buffer attributes on map

This is my first experience of using GIS systems. Firstly, to give you an overview of my project, I am trying to analyze the obesity rates within the boroughs of London. I have gotten to the point now ...
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Where do I find CRS axis names?

When using the SUBSETTINGCRS argument of a WCS query, one needs to provide the axis labels in the subsetting CRS. This answer to GeoServer does not work WCS parameters "subsettingcrs" and &...
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36 views

Expression to Transform XY coordinates to LatLong in QGIS

I have a Point Layer referenced in a projected CRS (UTM) with X, Y and Elev fields that represent coordinates of some points I have surveyed. I would like to have in the same layer Lat and Long fields ...
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30 views

Validating coordinates are within bounds of a spatial reference system

Given a geometry and a projection, how can I verify that all the coordinates in a geometry (Point, Polygon, ...) are within the bounds of the projection? (For example, WGS84 Bounds: -180.0000, -90....
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No transform available between EPSG:2100 and Unknown CRS

After upgrading from 3.04 to 3.10 my QGIS projects keep reporting "No transform available between EPSG:2100 and Unknown CRS" although the project settings dictate that EPSG:2100 should be ...
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22 views

Shifting/rescaling/standardizing coordinate system in spatial lines data frame using R

I have a spatial lines data frame object extent: 143516.4, 213981, 3353367, 3399153 (xmin, xmax, ymin, ymax) I want to standardize x and y coordinates and create the same spatial lines data frame ...
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Deprecated CRS (EPSG:2163) gets reinterpreted as another CRS (EPSG:9311) by GDAL

I recently noticed that all vector and raster files with CRS EPSG:2163 (US National Atlas Equal Area) are being automatically reinterpreted as EPSG:9311. When I load the layers into QGIS initially ...
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30 views

Replicating ArcInfo Projection Default Values

I am working to replicate an ArcInfo AML processing script in Python and am running into issues precisely replicating the raster output. In brief, the AML script reprojects input data from a Lambert ...
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How to draw a line on the 66th parallel north in ggplot when using a polar (epsg:3995) projection and ggspatial

This is a cross-post from https://stackoverflow.com/questions/64416400/how-to-draw-a-line-on-the-66th-parallel-north-in-ggplot-when-using-a-polar-epsg. I was not sure what would be the best forum to ...
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Equal area map projections: Lambert azimuthal or Albers conic?

When making small-scale regional maps on the order of 500-5000 km in extent where an equal-area projection is desirable, which would you prefer, the Lambert azimuthal or Albers conic? I realize this ...
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Projection issue

The Landsat data having a subset area when I try to open in QGIS it is locating on top of sea. See in picture
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reprojection number of rows and columns don't match

I have a 500m sinusoidal raster that I converted it into an approximately equivalent 500m WGS84 using the raster package in R by using the following script: library (raster) library(maptools) #Load ...
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58 views

Shapely flips lat/long coordinate

I have a pandas dataframe containing a Shapely geometry object. The shapely object (circle) was computed from the following SO https://stackoverflow.com/questions/27431528/find-the-intersection-...
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29 views

CRS for Ellipsoid Measurements

I noticed within the "Project Properties" there's an option for, Measurements --> Ellipsoid. What should this setting be configured to? From what I read online, if this is set incorrectly,...
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60 views

What coordinate system is this? How can I project it to WGS84 (lat-long) system in Python?

I had an AutoCAD drawing of a floor plan. I imported it to python using Fiona and checked the metadata. The CRS is empty. When I checked the coordinates for the geometry, it was in the following form, ...
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36 views

Nearest neighbor distance in km over contiguous US

I have two sets of line features in QGIS (rivers & roads - I'd like to find the road segment nearest to each river segment & the distance between them in km) across the contiguous United ...
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1answer
33 views

Problems defining custom CRS in QGIS - Orthographic projection

Working with QGIS 3.14 on Win 10, I try to define a custom CRS - I want to create an Orthographic projection centered on the Mediterranean - 35 N 20 E. What I did: I copied the WKT-definition of North ...
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33 views

Reprojecting raster using coordinate system of a polygon

I am trying to reproject my raster (raster1) using the coordinates of the polygon(boundary) in R. Method 1 below does not work, it gives me the error: Error in if (value[1] != nrow(x) | value[2] != ...
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24 views

gdal_translate outputs coordinates in metres, but I need degrees

I wish to convert a HDF5 file into NetCDF, with the output NetCDF containing the selected band(s) and the latitudes and longitudes. The data provider gives this info about the original file: Table 2. ...
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65 views

Convert XYZ coordinates from EPSG:2231 to EPSG:3857 (WGS 84 Pseudo Mercator)

I have some ground control points (GCPs) collected using coordinate system EPSG: 2231 (Colorado North USft). I have the data as a CSV. I want to convert the X,Y,and Z coordinates to WGS84 Psuedo ...
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51 views

How to calculate object real life location from self driving car?

I have a video made from a car together with GPS information (location coordinates, altitude, speed, track to true North degrees and other. Also I have a 3gf file of g-sensor but I’m not able to parse ...
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1answer
56 views

Leaflet with EPSG:3765; GridLayer.js:661 Uncaught Error: Attempted to load an infinite number of tiles

I am not sure about Leaflet 1.7 possibility to show layers in EPSG:3765. Not sure because from Leaflet docs it is not possible but I found something like Proj4Leaflet and it looks like it can... I get ...
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If I am using the coordinate system WGS84 ESPG:4326 and my cell size is 0.00833333,-0.00833333, how can I calculate the area of one cell in metres?

I am currently trying to undertake some area calculations on some rasters. I have them all in the coordinate system wgs84 ESPG:4326 which I have just realised is in degrees. My cell size is 0.00833333,...
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1answer
29 views

Add X/Y coordinate format incompatible with viewshed tool coordinate format in QGIS

I am performing an r.viewshed analysis (id: grass7:r.viewshed) in QGIS 3.10.9 with Grass 7.8.3. My question pertains to the 'coordinates' parameter. When I use the r.viewshed tool in QGIS and select a ...
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27 views

Fishnet cell size accuracy [duplicate]

I have a raster of 500m resolution based on MODIS sinusoidal projection, so I first converted it to WGS84. In order to create a 500m fishnet of the WGS84 raster in ArcGIS, I first converted the raster ...
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Cesium Terrain generated using DSM is way higher than the base map

Is there any way I can clamp the terrain to the base-map's height? Is the problem with the vertical datum for the data. I tried changing ellipsoid's radius-- but I learnt that the height is relative ...
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32 views

Delimited text layer doesn't align with shapefile

I have a shapefile of 25 major drainage basins of Canada and a .csv file of 77 point data I would like to plot within these drainage basins. I am using QGIS 3.10.9 I reprojected the drainage basins ...
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Creating average geometry for lines whose buffers intersect

I am learning SDO. I have started new project with SDO geometry. Here is some problem we have faced. We want a script where the x and y geometries in the intersecting buffers will be updated with the ...
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32 views

Is there a metric projection that works everywhere in the world? If not, what's the smallest set of EPSG codes for that?

I'm doing some calculations per country, using rgeos library in R. For each country, I need to calculate the bounding box area. So I transform the country's bounding box in a sp object, project it ...
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Raster projection changes to none when loading into MapWindows after already being defined in ArcMap

I am trying to load a number of raster files (.tif) into MapWindows v.4.8.8. These rasters have previously been reprojected in ArcMap to have the projection WGS_1984_UTM_Zone_60S and saved with this ...
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1answer
48 views

st_crop() follow latitudinal circle on polar projection

I am generating a polar projection with the rnaturalearth::ne_countries() dataset. Because I'm only interested in high-latitude regions, I want to crop the shape above a particular latitude. However, ...
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56 views

Finding out MapInfo file projection

I need to process some MapInfo data in QGIS 3.4, but I am unfamiliar with MapInfo. The data seems wrong when compared to a Google Satellite base map. I do not know the projection of the MapInfo layer, ...
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24 views

How to fix SRTM half-pixel shift with GeoServer

The SRTM data has an half-pixel shift (I assume that’s what is described in the last FAQ, and that GeoServer uses pixel corner origin ? I couldn’t find this information). Despite this shift being ...
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1answer
45 views

Calculating Slope from DEM in QGIS

I have a world DEM raster in QGIS in EPSG:4326 with elevation units in meters. I'm trying to get a raster of the slope of the terrain, and I'm doing so using the "Slope" tool under "...
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35 views

Converting points with Easting and Northing to polygons of GB OS Grid references?

Is there a tool or procedure on ArcMap 10.8 (similar to the Tom.bio plugin in QGIS) that allows the conversion of points with easting, northing and grid reference info into polygons of GB OS Grid ...
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41 views

Translating local coordinate system to world system

In QGIS we needed to measure an area with a total station but that time without a calibrated world coordinate system (no calibration points available). The North was only roughly oriented by compass. ...
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20 views

Manifest upload of multiple tiles to GEE and projection issues

I am trying to upload multiple tiles to Google Earth Engine using the manifest option: earthengine upload image --manifest manifest.json I am having issues into understanding and implementing the CRS ...
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28 views

Calculate the coordinate of a point inside a bounding box of a UTM zone map given the bounds, cartesian distance and ellipsoid mesurements

I am relatively new to the GIS domain. I recently purchased a 3D model of a city that is mapped to UTM zone 40N, and was provided the coordinates of the 4 corners of the bounding box in Lat Long. In ...

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