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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24 views

Converting CSV and reprojecting shapefile to match location of points

I have a .csv file with coordinates which should be converted into .shp file. The CSV file is built by analysing simple .tif raster without metadata. As far as no CRS is saved in .csv file, the ...
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31 views

Why do we see square or grid like pattern in GPS data?

I have been working on GPS data and I do see observe some grid or square like patterns from GPS. Any reason why this could be?
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Projecting using Cubic Convolution method of raster package of R

I read that cubic convolution produces a sharper output that the bilinear interpolation resampling technique and that as such, cubic convolution should be used for imagery. I only see nearest neighbor ...
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15 views

Help joining two polygon layers using ArcGIS Spatial Join

I am trying to use ArcGIS Pro to spatially join approximately 600,000 polygons in ESRI TitleInfo with the polygons in this London landuse dataset. However, the spatial join fails to match any record. ...
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16 views

Reprojecting shapefile using GeoPandas is causing a loss of geometry attribute [closed]

I have a dataset from environment Canada who confirmed to me that they use Canada Albers equal-area conic as their projection, even though the dataset had not CRS attribute when I did a print(...
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1answer
25 views

Leaflet Turf.buffer projection

I successfully created a buffer on Leaflet with Turf.JS . I had to change the map CRS to WGS84 (epsg:4326) to make it work. But the problem is that I need to go back to the default CRS of Leaflet ...
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1answer
32 views

Import CSV with longitude and latitude coordinates in QGIS

I have a CSV file with the first two columns containing longitude and latitude values. Now I want to create a point layer via the "add delimited text-layer" in QGIS. I have a problem with my ...
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1answer
19 views

Shapefile missing spatial reference information when run as a batchfile

I have Python script that needs to pull the ESPG code from a shapefile, when I run this in Intellij IDEA 2021.1.2 (using a Anaconda Environment for Python) it works correctly, but when it is run as a ...
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2answers
39 views

Is there a generally accepted or best practice for creating a prj file to define a local (or ground) coordinate system?

Background: Due to distortions inherent in projected coordinate systems, surveyors will often create "Local" or "Ground" coordinate systems for projects so that grid (state plane ...
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1answer
36 views

How does QGIS reproject data onscreen when the project CRS is geographic?

From what I understand any dataset (GCS or PCS) in QGIS must be "reprojected on the fly" according to the project CRS when viewing the data as a map onscreen. So my question is what type of &...
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34 views

Question about length and area differences in coordinate system and projections [closed]

I was looking at a polygon on ArcGIS Pro that had an area of 40 acres (WGS 1984 Web Mercator) and my friend was had the same polygon but with the NAD 1983 coordinate system. It measured 20 acres on ...
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1answer
148 views

Points appear in wrong country (QGIS)

I'm working on an assignment in QGIS where I'm supposed to measure the home range of 20 birds in southern Sweden. These birds had GPS trackers on them for some months back in 2014. When I open my CSV ...
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Reading vertical or compound CRS with OSR

I'm trying to compare the compound reference strings found in TIFF, LAS, and GBD files. I can get it for TIFFs using GeoTIFF tags and for LAS files with PDAL, but I'm only getting the horizontal ...
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Changing data from ECEF reference to Local reference [closed]

I am trying to write C++ code to convert from ECEF format to a local radar reference format but struggling regarding how to go about it. I am new to these things and have almost no idea about GIS. ...
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1answer
32 views

Coordinate Value not displaying after clicking on Map

I am trying to create a pop-up using Open Layers which will show the coordinate values when I click on the Map. There are no errors in the console window however, whenever I click on Map it displays : ...
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ST_LocateAlong strange behaviour around middle of Pacific

I am using ST_LocateAlong in order to find for a given track and timestamp the estimated position of the point at this timestamp, the timestamp being in the middle of the timestamps of my tracks. It's ...
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1answer
36 views

QGIS Line Buffer doesn't work

I want to do positional accuracy analysis by using QGIS 3.16, thus I need to do buffer zone around the vector layer (I am using buffer in geoprocessing tools). However, the result of buffer always ...
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4answers
84 views

Imported CSV file with x/y coordinates shown on Null Island in QGIS

Basically, I have a CSV table with lat/long coordinates that I am trying to upload onto a map. However, when I "add text delimited layer" it puts the spots in the completely wrong location. ...
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GDAL: Stitching aerial photos with X, Y, Z coordinates and omega, phi, kappa

Long story short, I have a bunch of aerial images in JPEG that I convert to GeoTiff and a .txt file containing X, Y, Z coordinates and the omega, phi, kappa of each image. I need to stitch all the ...
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1answer
28 views

Setting CRS with EPSG code when writting shapefile with Fiona

How to set the CRS when writing an ESRI Shapefile using Fiona on a modern Python version (>3.x)? Why "modern"? Because Python 2 is now deprecated and this user asked a similar question ...
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How to reproject a .LAS file from WGS84 UTM 32N to CH1903/LV95

I have a large .las point cloud (around 11GB) generated from pix4d and I need to convert its coordinate system from EPSG:32632 to EPSG:2056. I was able to export it as a CSV file but I am not able to ...
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33 views

Problem in setting dimension using rioxarray set_spatial_dims()

I am having trouble setting dimensions in a xarray object. I have created a xarray object (data, lats, and lons are 2D ndarray) and set a coordinate system as follows, and it is working. da0 = xr....
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How do I access the metadata or the transform information for the output of GDAL function?

I georeferenced some images using the GDAL module in python and some images using the QGIS function. The output of GDAL was good, but then it did not have any metadata information. For example, if I ...
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23 views

A way to read OpenDrive map oxdr as a dataframe or plot in Python

I am currently working with OpenDrive map data in Carla with the following file formats: pcd or xodr format. Please does anyone have any suggestions on how to load the maps in Python as a DataFrame ...
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2answers
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Making custom proj4-string with three parameters from old (1975) map

I am looking at an old map (the 1975 layer) and they only have three parameters for their projection: Projection: Rectified Skew Orthomorphic (Metric Grid) Spheroid: Everest Origin: 4.00 N, 102.25 E ...
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1answer
29 views

List supported WKT spatial references in GDAL, c++

I would like to ask if I can retrieve a list of supported projections from GDAL API. I am trying to use GDAL to coordinate transformation for my internal data in the following way. struct MyConverter {...
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1answer
70 views

Reproject NumPy ndarray without saving as TIFF

I have NumPy ndarray with shape (1063,2116,12) (has 12 bands). The ndarray has non geographical data, but I do have its' transform affine and the crs. I want to give this geographical data to the ...
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Reproject OSGB36 *.asc files to WGS84 netcdf

I am trying to reproject emissions data in OSGB36 easting and northings to WGS84 latitudes and longitudes, with the intention of then regridding the output to a regular grid. I need to do this for a ...
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33 views

What is the correct coverage area of EPSG:2901: Australia or Montana, US?

The two main websites I check CRS info disagree about what the CRS EPSG:2901 is intended for. Curious whether anyone can shed some light on this conflict. https://epsg.io/2901-area says Australia ...
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1answer
41 views

ERROR: Unable to open datasource with ogr2ogr

I am trying to convert OpenDrive file xodr file format to shapefile format shp using gr2ogr I am using: ogr2ogr -f "ESRI Shapefile" Town_01.shp Town01.xodr But I get the following error and ...
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2answers
58 views

Recursively reproject shapefiles in folders and subfolders

I would like to recursively reproject shapefiles with different source projections. The shapefiles (109) are saved in deep folder trees. They have 4 different CRS, all the *.prj are present. As result,...
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25 views

projectraster in R cannot complete transformation

I have a few .tif rasters (ELEV and POP) projected in long/lat, but I would like the CRS and extent to be the same as a shapefile I have (STUDYAREA), for example, my study area lies mostly in UTM16 so ...
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28 views

Create single line script tool message [closed]

I am trying to get my script to print the output FCs from arcpy.Project_management in a single line starting with Projected. Right now everything works except the shapefiles are all printing ...
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1answer
36 views

“EEException: Image.reduceRegions: Specify a scale or crs & crs_transform.” not accepting either

Question: Why won't image reduce region accept either a scale or a reprojection, in most of my cases but not all. Context: I'm trying to find if a landsat pixel has any cloud (based on ...
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1answer
622 views

What is this UK coordinate system?

I received a dataset of Merseyside area (corresponding to the metropolitan area of Liverpool, United Kingdom, broadly defined) where the location coordinates are totally a mystery to me, and ...
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25 views

Adding custom on the fly transformation in QGIS

I'm using QGIS version 3.20.0. I need to transform EPSG:4326 into EPSG:31468 on the fly, using the equivalent of ArcGIS's "DHDN To WGS 1984 4 NTv2", i.e. with a NTv2 grid. I've tested the ...
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How do I find these values for an Affine Transformation (state plane to local grid)?

so I need to perform some kind of transformation. I have a bunch of points like so: <record id="Localization Points" > <record id="Point 1" > <value name="Lat&...
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How to perform a helmert transformation (localization, site calibration, etc)?

I may be going at this problem the complete incorrect way, I just need some guidance is all. I need to perform a helmert transformation on lat/long to convert to a users local grid system that they ...
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25 views

Qgis 3.16 - layer can not projected

I have a point layer (EPSG:27572) and I'd like to reproject in PyQgis/Toolbox to EPSG:3857. Under 3.14 version, everything's ok. Then I update to Qgis 3.16 and it doesn't work correctly. Only 3/20 ...
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A Question on Localization (via proj4) with multiple points. Datum transformations from state plane to local grid with user defined points

I'm using proj4, And I'm wondering what the best course of action is to convert from state plane to a local grid system. I have files of these points from a .loc filetype that the user specifies. <...
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2answers
48 views

Transforming EPSG:25831 to EPSG:4326 in Decimal Degrees format

I have a .txt file with some x, y coordinates that I assume are in EPSG:25831. I want to transform these coordinates to EPSG:4326 in Decimal Degrees format. Example of one coordinate: x= 539746,19 y= ...
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1answer
46 views

Projection of map to WGS 84 3857 in QGIS ends up shapfile on 0.0 (near Africa) [closed]

I have a building shapefile in my country which, when imported is in CRS EPSG 4326 - WGS 84. I need to project this to typical latitude, longitude values (If my GIS knowledge is right, to EPSG 3857 - ...
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1answer
51 views

Shapefile not aligning with raster in Google Earth Engine?

When I upload a raster and shapefile into Google Earth Engine, the shapefile doesn't align properly. The datasets align perfectly in ArcMap, Envi and R. Both the raster and the shapefile are in EPSG ...
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30 views

How to convert NAD83 coordinates to Cartesian coordinates expressed in meters?

I have coordinates (longitude, latitude) expressed in NAD83 and I would like to be able to convert them to Cartesian coordinates (X [m], Y [m]) in order to use them for modeling. A similar topic deals ...
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1answer
20 views

Counting pixels in region in EarthEngine is drastically affected by “scale”

I am trying to obtain a count of how many pixels (data points, or measurements) there are in the MODIS dataset (chlor_a band) in a specific region in a period of several months. The problem is that ...
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Are Tissot's indicatrices enough to tell whether or a not a projection will keep 3D lines also straight in the projected 2D space

I have more of a math question, but one for which I want to know how it applies in the particular case of GIS, especially to map projections. Can a map projection keep any 3D straight line (e.g., ...
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3answers
71 views

Seeking library for computing accurate geographic buffer around coordinate in EPSG:4326?

In short, are there any C# or JavaScript API's that are capable of replacing https://sampleserver1.arcgisonline.com/ArcGIS/rest/services/Geometry/GeometryServer/buffer? I am trying to compute a ...
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2answers
120 views

QGIS 3 changing layer CRS for multiple layers simultaneously

I have about 30 layers. Each of them has project CRS EPSG:4326, which requires change to EPSG:3857. I know how to do it, which also has been explained here: https://gis.stackexchange.com/questions/...
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1answer
53 views

Getting a basemap in GDA94/MGA55

I'm working in QGIS. My project CRS is set to EPSG: 28355 (GDA94/MGA 55). Whenever I import basemaps they are automatically in EPSG: 4283 (just GDA94). When I try and change the CRS of the basemap to ...
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Linking USGS EVI raster to tiger state census tracks in r

I have created a formal class raster layer of enhanced vegetation index (EVI) in r with geotiffs from USGS. # Load rasters into R raster19037 <- raster("...

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