New answers tagged coordinate-system
2
votes
Is EGM2008 different to WGS84 ellipsoid?
In short
I have a DEM dataset which describes the vertical reference used as "height above the WGS84 ellipsoid".
As I understand it this assumes vertical values to have MSL as a reference ...
- 192
0
votes
How does rioxarray reproject match handle nan values?
This turned out to a be a problem with the initial projection of the source raster (EPSG: 9822 is supposed to be Albers Equal Area Conic but it's not a CRS that is valid in QGIS and looking up the ...
- 561
1
vote
How many CRS / EPSG codes are there?
This helps explain why at least three of the CRS registers exist: https://committee.iso.org/files/live/sites/tc211/files/Resources/GuideToCRSRegistries3.pdf
(Peter Parslow, chair of ISO/TC 211)
3
votes
Accepted
Assign a CRS to a raster in R
The raster tells you its extent (the coordinate values at the corners) are:
extent : 3388038, 3611062, 5266712, 5517788 (xmin, xmax, ymin, ymax)
Then you do this:
crs(r) <- st_crs(4326)$wkt # ...
- 62.5k
4
votes
Accepted
Is there a comprehensive list of mapnprojections implemented in R?
The projections and projection operations are not implemented in R directly - but in PROJ, which is a standalone library at system level. This library is integrated with R somewhat loosely - you can ...
- 965
0
votes
Converting EPSG:3346 to WGS84
This looks like a library that you need : https://github.com/dvdoug/PHPCoord
1
vote
Transforming from NAD83(2011) or from WGS84 gives the same result (pyproj)
You get that result because for Proj NAD83(2011) and WGS 84 mean the same. You can get a full report by testing the transformation with Projinfo.
projinfo -s epsg:6318 -t epsg:4326
Candidate ...
- 63k
0
votes
Convert WGS84 to Local Point
You could convert WGS84 to ECEF coordinates, then choose a ref point (should get a matrix 4x4) to convert to ENU coordinates.
But WGS84->ECEF is costly, you may directly use mapbox/cheap-ruler to ...
- 101
3
votes
Compute the area of differents buildings for differents regions in GeoPandas
You can use groupby each row, reproject it using .estimate_utm_crs, and measure the area:
import geopandas as gpd
file = r"/home/bera/Desktop/GIStest/worldwide_squares.gpkg"
df = gpd....
- 68.7k
0
votes
Converting NZTM (New Zealand Transverse Mercator) to Lat/Long
Created a javascript module "nztm2000-latlng" and released it to NPM repository. The precision is comparable to that of the C implementation.
Javascript is not precise enough in floating ...
3
votes
Calculating volume of fill needed using QGIS
Solution: reproject
You use a CRS that is not suitable for measurements. Reproject to a local CRS, e.g. the UTM zone valid for your area of interest. See also here for backround.
Details: why you get ...
- 67.2k
0
votes
How to set simple square grid as coordinate system in QGIS
All projected coordinate systems are just square xy grids.
The cartographic deformation is between the ellipsoid and the grid, but if you don't know their real world location or don't need to locate ...
- 13.9k
1
vote
How to set simple square grid as coordinate system in QGIS
I suppose you have a layer grid with an arbitrary cell size and a layer points, both in the same CRS (can be any CRS, does not play a role for this solution to work). On the points layer, use this ...
- 67.2k
0
votes
ArcGIS Pro 3.0: Changing coordinate system in dynamic text to show XY coordinates not dms, dd etc
Get rid of the "units" tag, to get rid of the "m" in the displayed text
Add the "showDirections" tag, do disable the "E" and "N" in the displayed text
...
- 1
2
votes
How to produce a Cartopy map in UTM with north-east up?
I can't say how to do it with a UTM projection, but I was able to do something similar using a custom-modified Oblique Mercator projection where I've enabled setting the "+gamma" parameter ...
- 131
0
votes
Accepted
Export image to it's nominal scale
I managed to solve it by specifying which image from the ImageCollection I wanted, like so:
Map.centerObject(table);
// Here I'm trying to set the Bits according to table 'Bitmask for QF_Cloud_Mask'
...
- 934
1
vote
Export image to it's nominal scale
In your code, dataset is ee.ImageCollection. Then, you select one band for each image in dataset:
var brdf = dataset.select('DNB_BRDF_Corrected_NTL');
so brdf is still ee.ImageCollection. The error ...
- 1,174
2
votes
EPSG for ETRS89 / Lambert Conic in Spain?
Note/Disclosure: I'm a member of the Geodesy subcommittee that maintains the EPSG registry. I work for Esri as my day job.
The short answer is that no one has asked for it. The geodesy subcommittee--...
- 18.8k
2
votes
Accepted
Differences in extracted values after projecting raster
When you use the "pipe" operator, it puts the thing on the left as the first argument of the function call on the right. You are doing:
NDVI_2005 <- NDVI_2005 %>%
projectRaster(...
- 62.5k
1
vote
Accepted
Overlaying map shaper geometries
To convert from a shapefile already projected to EPSG:27700 into TopoJSON using WGS84 projection I found the solution was to use init= as described here my example became the following.
mapshaper map....
- 121
0
votes
How to rotating a DXF world map along the longitude using QGIS?
The issue here was that I'm missing georeferencing information, the Reproject Layer tool works fine as expected.
- 101
0
votes
How to rotating a DXF world map along the longitude using QGIS?
Please try in QGIS, on the General tab of the Layer Properties, there is an Update Extents button
6
votes
Orientation differs between projections. What is the "Real" North?
As others have pointed out, orientations measured in GIS will always be relative to "grid north" for a particular projection. The relationship between grid north and true north varies ...
- 2,962
4
votes
Orientation differs between projections. What is the "Real" North?
The North of a projection refers to the projection's own definition.
Projections can be rotated or otherwise distorted in relation to the geometric body they project to a plane.
If you need ...
- 10.7k
-1
votes
Accepted
Incorrect transformation being used in GeoPandas?
Using EPSG:8999 or EPSG:7911 instead of EPSG:4326 makes the "shifted" data align with the "correct" data. That is really frustrating and annoying, both in ArcGIS and GeoPandas/...
- 148
0
votes
Importing DWG issue
You can do this by using a custom coordinate system (CRS) for these layers.
Select option Custom projections from the Settings-menu.
There:
Add a new CRS (+ button)
Enter a relevant name, say: BNGmm
...
- 765
0
votes
Define latitude longitude grid from center point
Reproject to a projected coordinate system. Then create a point grid, square buffer and go back to lat/long:
import geopandas as gpd
import shapely
import numpy as np
lat, lon = 50, -10 # my point
...
- 68.7k
2
votes
Accepted
Issue with GPKG imported in QGIS
It seems the layer's CRS is not correctly recognized. When loading the layer to an empty project, I get the same error you describe in the comments.
To solve it, proceed as follows:
Create a new, ...
- 67.2k
2
votes
Accepted
autonavi / amap xyz tile layer appears shifted in OpenLayers (Chinese Web Mercator with GCJ-02 datum)
The Baidu layer will align with OSM (but not using https) by changing var y = tileCoord[2]; to var y = -tileCoord[2] - 1; (see https://github.com/openlayers/openlayers/issues/10374)
For the amap layer ...
- 12.3k
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