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.

Filter by
Sorted by
Tagged with
4 votes
1 answer
559 views

Identifying French coordinate system

I'm having issues identifying the GPS system they used on this website : https://www.data.gouv.fr/fr/datasets/itineraires-de-randonnee-dans-openstreetmap/ Data looks like this : 804572.9409005984 ...
0 votes
0 answers
32 views

Handling internal reprojections for geoprocessing using R

Suppose I want to create a tool/function that has to, e.g., create buffers or measure distances internally to produce an output with a geographic projection. How do I ensure that the distance ...
-2 votes
1 answer
49 views

Finding intervals of latitude/longitude of cities throughout the world at 0.01° precision

Geographical coordinates determine a specific point on a map. I am searching for the coordinates interval (thus to frame the area) of different large cities by latitude/longitude at a 0.01°x0.01° ...
0 votes
0 answers
16 views

Finding intervals of latitude/longitude of cities throughout the world - NetCDF data [closed]

I am searching for a way to get intervals (at 0.01°x0.01° precision) of latitude and longitude of different cities. Would you have any resources I could use? I am trying to convert NetCDF data (.nc) ...
2 votes
0 answers
130 views

Projecting lines onto surface in QGIS? [closed]

I am designing a water distribution system for a rural village in Guatemala. I have created contours for the area. I need to lay out the pipe routes and need to know how to get the elevation of the ...
0 votes
0 answers
20 views

Projecting rasters, shift to the north

I would like to project one raster onto another and while doing so I think the values are changing their position "to the north". Is this an expected behavior? I was hoping to create a ...
0 votes
1 answer
104 views

ArcGIS Online and Nearmap Basemap Imagery

I am trying to get an exported Nearmap imagery as my basemap for an ArcGIS Online map. I have the Nearmap Image and it's respective georeference file (JPG File and JGW File). Is there a way to upload ...
0 votes
0 answers
20 views

Transform shapefile in UTM-Zone32N to UTM-Zone33N in QGIS

I'm using corine data, which I have downloaded for Germany with the following KBS: EPSG:32633 - WGS 84 / UTM zone 32N - Projiziert https://land.copernicus.eu/pan-european/corine-land-cover Now I want ...
10 votes
2 answers
2k views

Checking if two feature classes have same spatial reference using ArcPy

Using ArcPy, how do you check if two feature classes have the same spatial reference? Just checking if the two are equal doesn't work: >>> import arcpy >>> fc1 = r"C:\Users\e1b8\...
2 votes
1 answer
28 views

Transformation of coordinate systems [closed]

I need to transform the layer coordinate system from 2180 (ETRS_1989_Poland_CS92) to 5514 (S-JTSK_Krovak_East_North). I tried to do it using Qgis 3.2.3 (save as with new coordinate system 5514), and ...
2 votes
2 answers
73 views

QGIS : EPSG4326 : arc of circle with X radius centred in Z (aviation)

I am trying to make a polygon from the aviation LPPO FIR (Santa Maria Oceanic Flight Information Region), that some portion is described as "arc of circle with 100NM radius centred at PST NDB (...
1 vote
1 answer
38 views

Exporting data from points to a polygon

I'm new on GIS. We were migrating from an old map program to QGIS. My problem is that I need to have Polygons with data. And I have the information that I need in the polygons in "entities" ...
1 vote
1 answer
20 views

Projection systems mismatched

I was planning on importing a temperature file (in NetCDF format) as a raster layer. Here is the link of the temperature data (https://psl.noaa.gov/data/gridded/data.cpc.globaltemp.html). The data ...
0 votes
2 answers
29 views

How can I get QGIS Difference tool to operate on different CRS? Or can I project a polygon to go "off the side" of the map to the other side?

I am attempting to map arctic regions. I have a predetermined area off the coast of Alaska that has longitudes both negative and positive. In a north pole azimuthal equidistant projection, it looks as ...
-1 votes
0 answers
24 views

Reproject Google Earth Engine Nearest Neighbour

I’m trying to resample all the bands of the image. However, I have read that if you want to resample an image by the use of NEAREST NEIGBOUR, you have to used .reproject method. https://developers....
3 votes
1 answer
120 views

Calculate Geometry function returns underestimated distances

I'm making a map of the Colorado Trail and obtained a set of waypoints taken down the entire trail. I projected the set of waypoints from WGS84 (unprojected) to NAD 83 UTM13N after adding to the data ...
0 votes
0 answers
5 views

Get element in raster array based on BNG coordinates

I have some BNG coordinates which are converted from lat and long using proj4. I also have a raster file based on BNG. I want to get the relevant element from the raster array based on the coordinates ...
0 votes
0 answers
25 views

Understanding TIFF file georeferencing

I am new to maps and ArcGIS field, and having some issues understanding the used georeferencing systems, I have a dem.tif file, when extracting information I get X and Y in very large number, I used ...
1 vote
1 answer
917 views

Getting WGS84 lat lon bounds from VRT file

I have vrt files generated using gdalbuildvrt that reference GeoTiffs referenced using the NZTM coordinate system. Is there an easy way to determine the bounds as WGS84 latitude longitude coordinates? ...
4 votes
2 answers
129 views

Order of latitude and longitude in EPSG:4326

I recently started working with GPS data in PostGIS and am very confused about the order of latitude and longitude. I'm from Europe, and here everyone I know uses latitude first, longitude second, e.g....
0 votes
0 answers
21 views

Reprojecting (warp) raster changed the values of the reprojected raster QGIS

The reprojection of a raster containing slope data from CRS:4326 to CRS:25830 resulted in a change in raster values. When I add the reprojected raster over the original one and use the identify ...
2 votes
1 answer
1k views

PyProj - Transform coordinate in "HK80 grid" to "WGS 84 / UTM zone 49N or 49S"

Am trying to use python pyproj to do the above conversion (convert/transform from Hong Kong GRID to Hong Kong UTM), but am getting different values from the expected result. My expected conversion ...
0 votes
2 answers
109 views

Using WGS 84 (SRID 4326) or Web Mercator (SRID 3857) [closed]

I'm new to GIS and learning about SRIDs. Are there still other relevant or commonly used SRIDs than WGS 84 (SRID 4326) or Web Mercator (SRID 3857)?
6 votes
1 answer
1k views

Using MODIS sinusoidal projection

I have a large number of MODIS snow rasters which I am cropping with the extent of a shapefile. Currently, I am using spTransform so that my shapefile has the same CRS as the rasters. This code works ...
6 votes
1 answer
179 views

ArcGIS project raster produces incorrect vertical coordinates

I have a DEM in UTM (meters) / NAVD88 (meters) and need to transform it to State Plane (feet) / NAVD88 (feet). Unfortunately, I do not have the raster calculator in ArcGIS, so I have to use Project ...
0 votes
1 answer
51 views

MapServer WMS on-the-fly reprojection renders only partial image

When trying to access a WMS that gets on-the-fly reprojected from EPSG:2056 to EPSG:3857, I only receive partially rendered images (see image bolow). The more I zoom in, the worse it gets. If I access ...
0 votes
0 answers
39 views

CRS not working as it should when exporting

My QGIS is displaying as being in British National Grid, however whenever I export data and open it up elsewhere the projection displays as longitude/latitude. Does anyone know why this happens and ...
1 vote
1 answer
596 views

Transforming NetCDF file in longlat projection into TIF in EASE 2.0 using gdal_translate and gdalwarp

I am very new in this. My goal is to convert 1 subband from .nc files (which I have several thousand if it matters) stored in longlat projection into .tif files in EASE 2.0 projection. I do that in 2 ...
-4 votes
0 answers
41 views

Hobbs, New Mexico United states [closed]

How do I set all the measurements to imperial? Everything is in metric I need imperial Ft, miles etc Every single thing is metric this includes all distance mesasurement, accuracies, everything is ...
1 vote
1 answer
36 views

Wrong CRS being displayed

In my version of QGIS the British National Grid is currently set as OSGB36 however it needs to be OSGB1936. Does anyone know how I can change this? I have searched for it in the filter bar but it ...
0 votes
0 answers
24 views

Why referenced or derived mosaic datasets do not project rasters of different coordinate system correctly on-the-fly?

I am using ArcMap. I have many mosaic datasets in a projected coordinate system and I would like to project them into another projected coordinate system (different datum), but without locating and ...
4 votes
1 answer
119 views

Parameters of the coordinate system for calculating the rotation of labels along latitude lines

I'm making a map of a rather large region and I need to set the angle of rotation for the labels so that they are parallel to the lines of latitude. I do it in three steps: I take the central ...
0 votes
1 answer
383 views

Passing GeoJSON API to Leaflet (proj4leaflet) map

I have created a geographical view of a point using Leaflet based on a coordinate system data. Since I'm using the coordinate system rather than lat and long, I'm using proj4leaflet for the conversion ...
2 votes
1 answer
2k views

Changing CRS to enable clip function in QGIS

I have two layers, one point file and one polygon. The point file is in WGS 84 and polygon in NAD83-UTM10. The project CRS is NAD83-UTM10. They project fine with on-the-fly projection turned on. I ...
2 votes
0 answers
137 views

Putting locator from GPS coordinates in 3D projected map

I'm new to maps and not so good in math and geometrics. I have a 2d google map. I have to put a 2d projection of this map (not exactly this one but a handpainted one, so I will not violate any ...
6 votes
4 answers
11k views

Mercator: scale factor is changed along the meridians as a function of latitude?

"In Mercator projection the scale factor is changed along the meridians as a function of latitude" How to calculate the Mercator scale factor as a function of the latitude in decimal degrees ? I ...
0 votes
2 answers
243 views

Project and Layer having Projected Coordinate System tilting layer

QGIS 3.10, Ubuntu 18.04 I was questioning why my map displayed at a +10 degree rotation, but displayed unrotated in the Print Layout. What I do now: Set Project->Properties->CRS to EPSG:5070 - ...
0 votes
0 answers
18 views

Incomplete .prj file created when .mxd is opened

I have a single .mxd file that, when opened, creates a projection file (.prj) in the same folder as the .mxd file. This does not happen with other .mxd files. This projection file is called ".prj&...
1 vote
0 answers
14 views

How to convert osmium.osm.location cordinates to normal format coordinates in python(Pyosmium)

I have extracted the coordinates data from nodes using pyosmium. Though I was successful in extracting the data but the coordinates which osmium is giving is not in normal format, I tried to convert ...
0 votes
1 answer
33 views

Zero-width buffer trick makes the Caspian Sea disappear (using R)

I am new to plotting with coordinate systems. I am trying to generate a Pacific-centered map, and am using this wonderful code as a starting point. I have a bunch of data points from databases I'm ...
0 votes
1 answer
175 views

Diva-GIS CLM files missing projection, map units and datum

I have successfully created Diva-GIS CLM files from tiff climate data using the two approaches below 1) Geotiff file --> Ascii grid file --> GRD/GRI file --> CLM as explained by Julián Ramírez1 ...
0 votes
1 answer
18 views

SVG projection with mapshaper from OSM GeoJSON

I am converting boundaries queried with overpass-turbo (GeoJSON) into SVG with mapshaper. The resulting SVG has a with of 800 (mapshaper default, pixels) and a height of 520 - the resulting map seems &...
0 votes
1 answer
63 views

Raster does not match the target extent and shape of another raster ArcGIS

I have future climate data in .nc format. I transferred them into multiband rasters so I can separate them using another tool and make some calculations. I faced one issue in one variable where it had ...
5 votes
1 answer
101 views

How is datum used in assigning lat and long to point on Earth's surface?

It's accepted wisdom that geographic coordinate systems require a datum in order to assign lat/long to a point on Earth's surface. However, every point in 3d space already has 3d polar coordinates ...
2 votes
1 answer
85 views

Fixing misshaped GeoJSON polygons [closed]

In 2018 Ghana changed its administrative divisions (from 11 to 16 regions, and from 216 to 260 districts). Unfortunately, I have not been able to find the GeoJSON (or equivalent) data for the new ...
1 vote
1 answer
49 views

Choosing correct CRS to calculate distance and create buffers for datapoints in Ghana [closed]

I am using geographic datasets of households and mines in Ghana,Sierra Leone, and Liberia (I am analyzing each country separately). I am trying to calculate the distance between the clusters and the ...
3 votes
1 answer
25 views

Projected coordinate system for Sierra Leone

I am using geographic datasets of households (clusters) and mines in Ghana,Sierra Leone, and Liberia (I am analyzing each country separately). I am trying to calculate the distance between each ...
0 votes
0 answers
19 views

Is there any known incompatibilites between projections in QGIS 2.18 and QGIS 3.16?

I have a project on QGIS 3.16 with a shapefile of forest remnants from a given Environmental Protection Area in Rio de Janeiro, Brazil. The shapefle seems fine when used over a basemap and it appears ...
2 votes
1 answer
124 views

Using spTransform CRS in Leaflet

I am producing Kernel density estimates for animals from tracking data. Location is input at x y data, I produce a spatial polygons dataframe from these coordinates. xy<-id[c("X", "Y&...
1 vote
0 answers
12 views

Changing projection of QLR file in QGIS

I have converted a ESRI .lyr file to a .qlr file in QGIS using the SLYR plugin. However, it does not give me the option to redefine the projection. If I change it in the traditional format by ...

1
2 3 4 5
154