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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22 views

Can't Project Lat/Long data to UTM

I have a set of points displayed at their latitude & longitude (derived from a CSV) in my active ArcMap document alongside a layer in a PCS (NAD '83 UTM Zone 17N). The lat/long points and the ...
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Is an SRID unique?

I wonder why the Authority and the SRID are often both used together to refer to a CRS, like in EPSG:4326. Isn't the SRID unique? Wikipedia says it is a "unique value", but also that spatial ...
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Projection of aerial image using QGIS

I am having a very hard time with a USGS Declass3 image (D3C1210-200272A025). I have already tried different projections, unfortunately without success. For sure, the problem is me, but I don't know ...
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In my project layers that were originally created by a Garmin 62s are projected 300 degrees/100m differently to the background mapping can you help?

In my project layers that were originally created by a Garmin 62s are projected 300 degrees offset and 100m distant to the background mapping can you help? When I had these display problems in 'A ...
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25 views

Is there a way to search for the viewport [(x,y)(x,y)] bounding a region in QGIS?

I am looking for a way where I can draw a bounding box for an entity through the screen coordinates that I have for that entity zoomed-in My objective is to: Draw a rectangular box using the zoomed-...
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Fixing distortion of a polygon layer probably caused by geoid undulation

I have the following problem: I would like to use a polygon layer marking trees with the Bing Maps aerial background imagery in QGIS (3.20.1-Odense). But it the positions of the polygons are slightly ...
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44 views

Connect corners of two rectangles via SVG line in Leaflet

Assuming I have two rectangles on a leaflet map with CRS.Simple, how can I use svgOverlay to draw a <line> that connect top left corner of the two rectangles? I'm having issue with spatial to ...
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31 views

Re-georeference an image that already has a spatial information

I have an aerial image that already has geo-spatial information (already georeferenced), but the original georeferenced location is very rough (not accurate). I wanted to create ground control points ...
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"GSS_International_1924" to "GCS_ETRS_1989"

I need to make a Geographic Coordinate System Transformation from "GSS_International_1924" to "GCS_ETRS_1989" but my ArcMap (Version 10.4) doesn't have any method for that. Can ...
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38 views

Get random list of coordinates based on specific area? [closed]

How can I get a random list of coordinates in a specific area? For example, I have the following area: How can I get a random list of coordinates that fall within this specific area?
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What CRS should I use to get the correct results for building a bussel boundary anywhere in the world?

I use a compass and a bussel to set the boundaries of a logging site. I have the coordinates of the starting point (WGS 84), the directional angles (in degrees) and the distances (in meters). What CRS ...
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25 views

"Scaling Down" a map

I'm doing some 3D modeling (non-analytical) using DEMs exported from QGIS by clipping by a mask layer then modeling in blender. The issue is that when I bring the rasters into blender using the "...
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Choosing map projection type for flight plan

There are two projection of maps that I saw online. UK CAA is a transverse projection map, while ICAO maps are conical. It seems that transverse map is easier for flight planing as straight lines are ...
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Map disappears after using Natural Earth projection in QGIS

I have a world map using the WGS 84 projection. I can reproject it as Miller, Robinson, or other projections, but when I use Natural Earth I or II, the map disappears. I'm applying this through ...
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Matching a raster projection to simple features spatial layer using R

I have two dataframes in R. One, df_points, has spatial information saved as points. The other, df_raster, is a raster file. I want to extract information from the raster to the points using: rasValue ...
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Printable Globe in QGIS

I'm trying to figure out how to use QGIS to print a map so that it can be wrapped around a sphere. I haven't found a projection that will display the map in a way similar to these. It sounds like ...
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How to use affine matrix to calculate row-column pair on a raster corresponding to a lat-long pair using NumPy?

I have a pair of latitude-longitude coordinates: lat, lon = 59.87115844471202, 10.656472637769236 I have a URL for a TIFF (this - it's public). I open it with rasterio (install: pip install rasterio),...
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GeoPandas does not write CRS in MapInfo Tab

I'm trying to convert a GeoTIFF file into a MapInfo format with Python and GeoPandas. To do that, I'm using the following code: mask = None with rasterio.Env(): with rasterio.open('geoTiff.tif') ...
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23 views

Accessing built in coordinate systems from ArcGIS Pro Python Toolbox tool

I am attempting to create a custom ArcGIS Pro Python Toolbox tool and some of the geoprocessing tools I use run slowly or not at all if the input DEM or environment is not projected first. I would ...
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39 views

Drawing a Custom Map Projection in D3 using Observable

I am trying to create a custom map projections in D3 using Observable, following the approach given in the d3-geo Docs. Essentially, you pass a function that takes in (lambda, phi) and returns [x, y]. ...
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19 views

Map layers disappear when new projection is defined

I am using ArcGIS Pro to define projections of 2 different layers (1 unknown, 1 WGS84) from a 3rd layer's correct projection (MGI Austria GK M31). I have also transformed the map's projection from ...
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26 views

Fit/scale 2d line in a given square

I have the below python code sample using the s2sphere library to create a bounding box around a rectangle in latitude-longitude space: for line in self.polylines: for latlng in line: bbox ...
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60 views

Importing CSV to QGIS but doesn't work properly

I'm trying to import CSV to QGIS but have a problem with coordinates. I added CSV (with longitude and latitude) via add delimited text-layer. Then I added OpenStreetMap and arrange the CRS But it ...
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26 views

Determining if a GeoTIFF's projection is in spherical or cartesian coordinates

I have received GeoTIFF that may be projected into a UTM or cartesian coordinate system or may be in a spherical (lat/lon) coordinate system. Is there a reliable way to automatically determine which ...
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125 views

Could this be any other geographic coordinate system than DMS?

I got given these coordinates for a point at Erdington Rugby Club, Birmingham. However, when I type them into Google Maps I get an error message and when I convert them from DMS or DDM to DD I end up ...
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48 views

Working with multiple layers in different CRSs using QGIS

I am trying to delineate a river basin located in Turkey. Turkey has divided in different zones as CRS. Half of my river basin locates in one zone (EPSG:2206), and the other half locates in a ...
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34 views

Changing origin in QGIS projection

My issue is that the QGIS print composer cannot print images that have coordinates passing beyond 180 degree in WGS84 (since it's going from -180 to 180 degree). The area of 180 degree is in the ...
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Running proj/cs2cs command in Powershell

I'm reading a book where it says to run the following in the commandline, I think he used Linux. Therefore the command doesn't run in Windows Powershell cs2cs +proj=latlong +datum=NAD83 +to +proj=utm +...
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77 views

Coordinate Formatting, trying to convert to GPS

I have a .shp file with a large number of coordinates and I'm not sure how to transform to GPS coordinates. Ideally I'd like to use Python to convert , but have not seen this formatting before: [(...
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Extracting a Particular Masked NetCD4 Datapoint in Python

Suppose in Python, I have read in a netCDF4 file, as follows: import netCDF4 ds = netCDF4.Dataset('fire_weather_index_2018.nc') The aspects of the netCDF4 is as follows: <class 'netCDF4._netCDF4....
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QGIS 3.16.x .gsb grid file transformation

Is there a way to add .gsb grid files for transformations in QGIS 3.16.x and above. The instruction in: QGIS transformation defined in srs.db tbl_datum_transform table not available in Select Datum ...
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41 views

Saving CRS information using GeoPandas

How does GeoPandas save CRS information? globe = ccrs.Globe(ellipse='sphere', semimajor_axis=6370000, semiminor_axis=6370000) crs = ccrs.LambertConformal(globe=globe,central_longitude=111, ...
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Raster aligned but distorted in ArcGIS Pro

I have mapped a raster image (.tif) from a MODIS image collection in ArcGIS Pro and would like it to align with a polygon (red). However, the image seems to be slanted, which I assume is a projection ...
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42 views

Appropriate CRS for land-use change within EU?

I'm currently studying coordinate reference systems and using ArcGIS Pro 2.8 to find appropriate CRSs for different circumstances. To conduct an analysis of land-use change in the EU, would the best ...
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26 views

Proj Error when trying to save data in PostGIS database from geodjango

I want to store my raster image(tiff) in my PostGIS database I have a Django model ndvitime and I want to store my tiff image from earth engine to my database. The error arises when I want to save the ...
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40 views

What does the coordinate values represent when using WGS 84 / Pseudo-Mercator (EPSG:3857)?

I'm fairly novice in using gis. I have been using QGIS for a couple of weeks now, mostly for data collection in my research project. Currently, I'm trying to plot these points, in a graph similar to ...
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24 views

ArcPy not applying geographic transformation

For several georeferenced images (.tif) that are in a wrong projection (3857) I want to reproject them to the correct one (28992). In ArcGIS Pro I can use Raster Export, set the correct CRS and the ...
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QGIS project out of alignment with OSM

I have a project with a CRS set to ESRI:102400. It contains an OpenStreetMap layer, added from XYZ Tiles, with a CRS of EPSG:3857. When I open the file in QGIS running on a Mac (Mac OS 10.15.7, QGIS 3....
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Shape width estimation from raster

I want to estimate the measurements of a shape present in a given raster image and I want to know what is the proper way of handling the measurement dependence on the projection. More specifically, I ...
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34 views

Reprojecting layer with missing prj file using ArcMap

I have a point shapefile of farms in an area, but the prj file is missing. I know where they are supposed to be but I can't overlay them with existing shapefiles from that area. I tried to define the ...
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71 views

Visually correcting systematic shift between two geodatasets using QGIS

The equivalent question has been asked wrt ArcMap, but I'm using QGIS and am also an inexperienced user. I have multiple rasters, provided as GeoTIFFs, that are all projected to the same custom CRS ...
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30 views

FEPSG of GeoTIFF given by GDAL is different than on QGIS

I have a GeoTIFF file and I wanted to know its CRS. When I open it on QGIS I get:. I wanted to see if I could get the same result on Python (EPSG = 5936, the code for Alaska_Polar_Stereographic), I ...
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104 views

Calculate area for Chinese cities

The task is to calculate areas for small project sites (polygons) in various Chinese cities. The dataset is available as EPSG:4490, the project CRS is also set to EPSG:4490. To get accurate comparable ...
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Equal Earth Projection in Google Earth Engine

I'm trying to get a gobal visualization similar to what NASA does. They are probably using popular Equal Earth projection (EPSG:8857), but this fails in GEE. In order to implement this projection, I ...
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QGIS and CRS _ 2 different CRS for one project

I have a project which is based on the CRS "EPSG:3035 - ETRS89-extended / LAEA Europe" I would like to have a background with the European continent; I thought about adding the "OSM ...
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Matching Google Earth with Bathymetry and LiDAR - can't figure out CRS transformations

I'm using Environment Agency SurfZone Digital Elevation Model 2019 which is EPSG:27700. It aligns with the OS Light 27700 layer and local Bathymetry. However, I'd also like to use Google Maps/Hybrid ...
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66 views

Deleting created custom CRS using PyQGIS

How can I delete custom CRS by PyQGIS? My not working solution is: my_crs = QgsCoordinateReferenceSystem() my_crs.createFromProj4("+proj=aea +lat_1=21 +lat_2=49 +lat_0=37 +lon_0=87 +x_0=0 +y_0=0 +...
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147 views

Identifying coordinate system from dataset (without using GIS software)

I've got a CSV file which I downloaded from a Waka Kotahi open data website. The file has got X,Y coordinates of locations. I am using that file in Python to generate markers in Folium. I don't have ...
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35 views

How to assign/project las-file using R?

I have got a LAS file from a MLS, which has following specifications: test <- lidR::readLAS("<file.las>") print(test) #> class : LAS (v1.0 format 1) #> memory : ...
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Georeference problem QGIS v3.16.11

I am trying to do georeference to image on the background of Google Maps. I download Google Maps using XYZ tiles when I open the Google Maps the map use WGS 84/Pseudo-Mercator CRS. When I try to do ...

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