36
votes
Accepted
Changing projection of shapefile in QGIS
There are three different ways to change/manipulate projections in QGIS:
1. Project Properties > CRS (or you can click on the icon where EPSG is written in the bottom right corner)
This defines the ...
- 1,152
26
votes
Accepted
Extracting EPSG from a raster using gdal bindings in Python
I found the following workaround. I am unsure if it is the most efficient, but it does work for me.
from osgeo import gdal, osr
path = r"C:\temp\test2.tif"
d = gdal.Open(path)
proj = osr....
- 1,317
22
votes
How can EPSG:3857 be in meters?
It is a projection of a spheroid on a flat surface. Every projection has strengths and weaknesses and will preserve some elements of direction, distance or area better or worse than others (which is ...
- 33.6k
15
votes
Accepted
Why accurate area of all countries cannot be obtained using a single EPSG code, even if it corresponds to an equal-area projection?
What went wrong: EPSG:3395 is not equal area
The CRS you use, EPSG:3395, is definitely not an equal area projection. It is a World Mercator projection that heavily distorts areas, see here, including ...
- 63.1k
14
votes
Accepted
What is the proj4string of the Lambert azimuthal equal-area projection?
9820 is the EPSG code for the laea projection definition. You can find it at https://www.epsg-registry.org/ under retrieve by code. This code numer has nothing to do with the commonly used EPSG codes ...
- 76.3k
13
votes
Accepted
What is the SRID for EPSG 102743?
There is no EPSG SRID 102743. Note that EPSG is the authority, and 102743 is the SRID. If you look up SRID 102743 on spatialreference.org, the listing is for ESRI:102743, meaning that ESRI (the ...
- 4,595
13
votes
Accepted
What is the difference between spatialreference.org catalogs: EPSG, ESRI, and User-defined?
Short Answer:
QGIS handles SRS much the same as ESRI. Dive into QGIS and you'll find all your favorite SRS waiting for you.
Long Answer:
EPSG is the European Petroleum Survey Group. It provides '...
- 33.6k
13
votes
Accepted
Convert GPS coordinates into 3-dimensional cartesian coordinates (x,y,z)
To do 3D transformations, you need 3D CRS:
EPSG:4326 (2D) -> EPSG:4979 (3D)
<Geographic 3D CRS: EPSG:4979>
Name: WGS 84
Axis Info [ellipsoidal]:
- Lat[north]: Geodetic latitude (degree)
- ...
- 7,141
12
votes
Accepted
What's the meaning of numbers before an EPSG code, e.g. the 6.9 in EPSG:6.9:4326?
Note: this is part of an answer already given here, but it seems fitting to post it again.
The 6.9 means that the SRS 4326 specified in version 6.9 of the EPSG database, which you can find here.
- 2,295
12
votes
Accepted
PROJ.4 How to create custom CRS to displace by x and y?
The EPSG:32719 is a UTM Zone 19 south setup with:
$ grep -B1 '<32719>' /usr/share/proj/epsg
# WGS 84 / UTM zone 19S
<32719> +proj=utm +zone=19 +south +datum=WGS84 +units=m +no_defs <...
- 3,518
12
votes
Accepted
How do coordinate reference systems and projections relate to each other?
Does qgis just pick a default projection or does that mean that in epsg 4326 there's a 2d projection defined as well?
QGIS doesn't project the geographic coordinates to the map canvas. If the map ...
- 13.4k
11
votes
Accepted
Convert UTM zone into EPSG code
Use pyproj (version 2.2+):
from pyproj import CRS
# use PROJ string, assuming a default WGS84
crs = CRS.from_string('+proj=utm +zone=36 +south')
# or dictionary
crs = CRS.from_dict({'proj': 'utm', '...
- 41.6k
11
votes
Accepted
GeoPandas Warnings unless wrong EPSG is used
You get that warning because EPSG:4326 (WGS84) is geographic CRS and its unit is degree. The key message here is "Geometry is in a geographic CRS". You don't get a warning when using EPSG:...
- 74.6k
10
votes
leaflet map crs is 3857 but coordinates 4326
This is a feature, not a bug. Most Leaflet users are not aware that the map's display CRS is different from the map's data CRS, and that's fine; it makes life simpler for most people.
If your ...
- 10.1k
10
votes
Extracting EPSG from a raster using gdal bindings in Python
You can also do this in one line using gdal.Info as so:
epsg = int(gdal.Info(input, format='json')['coordinateSystem']['wkt'].rsplit('"EPSG","', 1)[-1].split('"')[0])
This does essentially the same ...
- 680
10
votes
Accepted
Finding out whether an EPSG code is geographic or projected in Python
You can use PyCRS library.
import pycrs
crs3857 = pycrs.parse.from_epsg_code(3857)
print("EPSG:3857 is " + crs3857.cs_type)
crs4326 = pycrs.parse.from_epsg_code(4326)
print("EPSG:4326 ...
- 74.6k
10
votes
Why accurate area of all countries cannot be obtained using a single EPSG code, even if it corresponds to an equal-area projection?
In addition to the fact that EPSG:3395 is not an equal area projection (therefore inaccurate for area measures), as mentioned by @Babel, a precise measure of the area requires a good projection. ...
- 49.3k
9
votes
Accepted
Reproject shapefile in QGIS using "save as" return weird result
You did nothing wrong. It's just the fact that a Mercator projection can not display the south pole.
The dataset you have contains a whole line at the bottom on 90°S, which can mathematically not be ...
- 76.3k
9
votes
Converting EPSG:2284 to EPSG:4326 with pyproj
Simply use (Converting elevations into correct units with pyproj?, Proj4 String for NAD83(2011) / Louisiana South (ftUS), ...)
preserve_units=True (as you say, pyproj assumes that your coordinates ...
- 54.2k
9
votes
Accepted
Google Earth Engine Reprojection to non-EPSG defined CRS
Yes, Earth Engine can reproject images to non-EPSG coordinate reference systems.
Earth Engine uses the Java GeoTools library for coordinate system transformations which supports the Coordinate System ...
- 5,371
9
votes
Listing all EPSG projections to serve it on the client side
GDAL is using Proj and Proj since version 6 keeps the definitions or coordinate reference systems in a small SQLite database that is named "proj.db". Therefore the most natural place for ...
- 61.9k
9
votes
Accepted
Combining two shapefiles with different map projections in QGIS
Use the 'reproject layer' tool on the layer you want to change. Or, if you just need to reassign the projection without reprojecting the data, then use the 'assign projection' tool.
If your data is ...
- 7,275
9
votes
Accepted
Choosing CRS for area of interest of my project
Go to https://epsg.org/ and define your region of interest, e.g. using box and drawing a rectangular polygon:
You get a (long) list of CRS valid in the defined region.
Decide what kind of projection ...
- 63.1k
8
votes
Accepted
How to find the extent of (many) EPSG CRSes?
You can download the EPSG data from http://www.epsg.org/DownloadDataset after you register. No cost to register, and no delay between registration and download.
There are two formats that might be ...
- 12.8k
8
votes
Why do 2 EPSG Codes exist for the same coordinate system?
EPSG:31463 seems to be deprecated and EPSG:31467 is the correct one.
http://spatialreference.org/ref/epsg/dhdn-3-degree-gauss-zone-3/ is stating:
ProjCRS related to inappropriate coordinate ...
- 627
8
votes
Coordinate system for Finland in ArcGIS Desktop?
As you found, EUREF-FIN is a realization of ETRS89 in Finland.
Some countries, when displaying coordinates or transmitting data, use the convention northing, easting order while other countries use ...
- 18.7k
8
votes
Accepted
What are the units in CRS EPSG:4326?
Decimal degrees. Not so much the CRS as the way computers handle floats. They use decimal numbers, not sexagesimal values. Pretty much every CRS uses decimal numbers, whether they are spheroidal or ...
- 2,060
7
votes
Reprojecting EPSG:3412 to EPSG:4326 using GDAL?
According to spatilreference.org, your proj4 string is not correct. -a_srs defines the projection but does not modify the coordinates, so your output vrt file is likely to be incorrect (based on a ...
- 49.3k
7
votes
What are the units in CRS EPSG:4326?
Create a point-layer in EPSG:4326 (I use QGIS), add a few features and label them with $x to get the value of the x-coordinate: as you can see, decimal values are used. If you go to layer properties, ...
- 63.1k
7
votes
Order of latitude and longitude in EPSG:4326
Note EPSG.io despite its name is not the official registry of EPSG. The official EPSG Geodetic Parameter Dataset is https://epsg.org/home.html.
The CRS EPSG:4326 is (and always has been) defined as ...
- 13.2k
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