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.
8,246
questions
0
votes
0
answers
11
views
Projection Issues between Pix4D and QGIS [closed]
I am conducting mapping missions with a DJI M300 RTK drone and P1 with an Emlid RS2+ base station and processing through Pix4Dmapper (4.8.4). GCPs were taken within the survey area using the Emlid RS2+...
- 1
0
votes
0
answers
34
views
Georeferencing in ArcGIS [closed]
I just started georeferencing an image as usual but I got suprised with the input DEM longitude and latitude been disappeared.
Can you tell me why?
- 1
0
votes
0
answers
25
views
Best map projection for buffers and Euclidian distance in Cox's Bazar, Bangladesh (20sq.km)
My study region is a 20 square kilometre area in Cox's Bazar, Bangladesh, and I am using R. I'm wondering which map projection would be the most accurate for measuring linear distances between points, ...
-1
votes
0
answers
33
views
How do Tissot's indicatrix look in a gnomonic projection?
For a mathematical problem (no homework)
A map is given with Tissot's indicatrices.
How can I conclude if the map is gnomonic or not?
(Just to be complete , a gnomonic projection is a projection were ...
- 1
0
votes
1
answer
29
views
CRS for georeferencing TCP flight maps of Spain
I want to georeference TCP flight map of Spain.
It says: Lambert Conformal Conic Projection
Standard Parallels 41dg 20' and 46dg 40'
Convergence factor 0.69491
QGIS does not offer this CRS and even ...
- 91
0
votes
0
answers
27
views
How to put TIFF orthomosaic in GCS projection show up over LAS dataset and rasters
I'm working in ArcMap. I have an orthomosaic (TIFF) that was originally projected in WGS 1984 and EGM2008 vertical datum. I need it to match up with a LAS dataset and the associated rasters, which are ...
0
votes
0
answers
17
views
How to unclip an image using rasterio?
I have a data transfer pipeline that is expecting an image in EPSG:4326 covering the whole world. The image I downloaded from my service provider is clipped to north America. Is there a way to ...
- 2,650
0
votes
0
answers
29
views
Picking a projection over which to aggregate point data
I have some polygons, say, TIGER counties, or hexagons, or what have you. I also have point data that I would like to aggregate over those polygons.
I will be displaying this data on a web map, so ...
- 121
0
votes
1
answer
16
views
How does rioxarray reproject match handle nan values?
I have a couple GeoTiffs where the "no data" value is set to 32767. I want to set those values to NaN and then use nearest neighbor interpolation to resample the data and match the ...
- 561
0
votes
0
answers
26
views
Importing a set of X-Y coordinates - data gets split and partly misplaced at the boundary of Austria GK Central and Austria GK East
I have an Excel file of coordinates of a line structure (think river or infrastructure like road, railways etc) without any info about the coordinate system except that it says GK in the X and Y ...
- 141
0
votes
1
answer
34
views
Assign a CRS to a raster in R
I have a raster that does not contain any crs. After I assign a crs, the raster still appears in another location. Am I missing something?
library(raster)
#> Loading required package: sp
#> The ...
- 61
1
vote
0
answers
46
views
Identifying the coordinate system in a set of Australian data
I have the following set of data.
Name
Easting
Northing
Point 1
7675
0576
Point 2
7758
0330
Point 3
7568
0864
I would like to know what coordinate system this data uses, to convert it to latitude ...
- 11
2
votes
1
answer
79
views
Is there a comprehensive list of mapnprojections implemented in R?
I would like to experiment a bit with different and less-frequently used projections in R for global maps, but I am playing a guessing game as of which are actually working.
I tried to look up ESRI or ...
- 578
0
votes
0
answers
23
views
Pyproj Azimuthal Equidistant (AEQD) transformation always gives a small rotation as compared to country-specific CRS transformations
I am calculating building polygons from a satellite image.
This works accurately when using a country-specific CRS.
I would like to use a customer CRS, specific to the location at hand, but find that ...
- 1
0
votes
0
answers
22
views
Assigning coordinate value to raster with GDAL Python
This might be easy, but my search has not been successful yet...
I have a multiband raster file that contains projection and geotransform metadata. When I write my file into an array, I would like to ...
- 1
1
vote
1
answer
78
views
Transforming from NAD83(2011) or from WGS84 gives the same result (pyproj)
I'm trying to transform (using pyproj) the same coordinates, first from WGS84, and then from NAD83(2011), and I'm getting the same result:
from pyproj import CRS, Transformer
from_wgs84_transformer = ...
- 11
0
votes
0
answers
59
views
How to find long/lat (in Python) from a GeoTIFF that does not have CRS
I have a GeoTIFF file that in Python the dimension is (9991,10439). I need to know the long/lat information for each pixel but the problem is the CRS is None for this file and when I try to create a ...
- 33
0
votes
0
answers
18
views
Custom created Polygons don't display on Folium map
I've got a Geopandas Dataframe (polygon_df) that looks like the one below, these Polygons were created by a Yolo segmentation algorithm and transformed twice from their original format (this ...
- 1
0
votes
0
answers
30
views
Some iterative way to compute heading and GPS projection at the same time?
I have the following situation:
An off-road machine has a GPS antenna that is not at the center of the rear axle (this point is my path-tracking-control point). Let's say it's 3 meters from the rear ...
1
vote
2
answers
52
views
How to set simple square grid as coordinate system in QGIS
I have a set of coordinates of drill sites that have x and y values ranging between 1-300. My task is to interpolate a 3D model out of them but that's easy. What I'm struggling with is setting a ...
- 11
0
votes
0
answers
55
views
Order of coordinates when transforming with GDAL in Python
I'm trying to use GDAL in Python to transform coordinates from one CRS to another.
More specifically, from MGI / Austria GK M31 (EPSG:31258) to WGS 84 (EPSG:3857). For example, I want to transform the ...
- 9
1
vote
1
answer
60
views
Calculating volume of fill needed using QGIS
I have a project where I have to estimate fill volumes required to fill in small valleys. I have point data with elevations from GPS measurements from which I've created DEMS for each valley. I've ...
- 11
1
vote
2
answers
47
views
Export image to it's nominal scale
I am trying to export an image without having to specify the scale and the CRS in the Export.image.toDrive function. In order to do this I found online a solution which I tried to apply it on my ...
- 936
0
votes
0
answers
20
views
Planetary (Venus) coordinate reference systems
I'm trying to understanding the projections and trying to load in Venus global map data but when I try to align different maps with the same projection, or even change projection, I consistently get ...
- 21
1
vote
1
answer
30
views
EPSG for ETRS89 / Lambert Conic in Spain?
Official projections in Spain are based on ETRS89 / UTM.
A royal decree says Lambert Conic Conform should be used for small scales. I found a paper that describes well the parameters of that ...
- 383
1
vote
0
answers
34
views
Adding WMS-Maps to the Layer-section in QGIS by making groups and subgroups through Python
I want to add WMS-Maps to the Layer-section in QGIS, where there should be a group and sub-groups with those. The wish is to add the WMS-Maps to the Layer-section and group them at once-time by using ...
- 11
0
votes
1
answer
24
views
Differences in extracted values after projecting raster
I am trying to project a raster to EPSG:3035 to match the CRS of the grid file on which it should be extracted to.
I use this code:
NDVI_2005 <- raster("data_Raster/Greenness/mosaic2005_2006....
- 3
1
vote
1
answer
33
views
Overlaying map shaper geometries
I seem to be getting an issue when trying to create TopoJSON from two shapefiles and then overlaying them with D3. One is a linestring object, a pipe, and then other is the map.
If I upload a zip file ...
- 121
0
votes
2
answers
49
views
How to rotating a DXF world map along the longitude using QGIS?
I don't know much of GIS in general, but I tried to find an answer for that for a long time.
I have a vector world map in SVG (CRS Equal Earth) that I converted to DXF in Inkscape. I want to rotate it ...
- 101
3
votes
2
answers
284
views
Orientation differs between projections. What is the "Real" North? [closed]
Below are two screenshots of the same data, featuring plots of land considered for a photovoltaic array. Depending on the projection used, there is a difference in the orientation of features.
(Taken ...
- 383
0
votes
0
answers
7
views
No valid training data were found. (Error code: 3) with Random Forest
In the last two days I integrated three new variables: NDVI, EVI and Copernicus Land Cover. Since that moment my model doesn't go. I tried to cover the entire AOI with Modis and Copernicus Image with ....
0
votes
1
answer
47
views
Incorrect transformation being used in GeoPandas?
Using GeoPandas, I am loading a csv with log data from a DJI drone, which contains longitude and latitude in WGS84 (4326). For my project, I am working in EPSG:6559 (esri calls it "NAD 1983 (2011)...
- 148
0
votes
1
answer
44
views
Importing DWG issue
When I import a DWG, into QGIS, sent by an architect it is not located in the correct place. I'm using EPSG:27700
If I edit the file in CAD and move the drawing by a factor of 1000, so 415287786.3,...
0
votes
1
answer
36
views
Define latitude longitude grid from center point
I would like to create a regular squared grid from a particular point. I have a polygon, I take the center of this polygon and I would like to create a grid that contains this polygon using Python.
I ...
0
votes
0
answers
9
views
Copernicus C3S Dataset: details on CRS and Projection
I am working with Copernicus C3S data and I am having difficulty interpreting the descriptions relating to the Projection entry on the portal. I understand that Regular lat/lon means WGS84, my problem ...
1
vote
0
answers
29
views
How to make TIFF output file with coordinate reference system (CRS)
I am working on TIFF files to produce the median matrix for them, I am using the following Matlab code for that.
How I can make the output as .tif while keeping the coordinate reference system (CRS)?
...
- 11
1
vote
0
answers
48
views
Assign CRS for drone imagery
I am importing TIFF imagery from the Phantom 4 Multispectral drone which does not have predefined CRS. When I double click the layer and go into the source tab and select a CRS, it displays over the ...
- 41
2
votes
1
answer
82
views
Issue with GPKG imported in QGIS
I am starting to use QGIS and have been struggling to get a GPKG package to sit properly.
This package contains the London conservation are information, which can be downloaded from the link below:
...
- 23
0
votes
0
answers
24
views
Layers with the same coordinate system do not overlap [duplicate]
I have the shp from my city and I created a layer with points in my city through an Excel sheet with X and Y coordinates. Both layers are in WGS_1984_UTM_Zone_21S but do not overlap. The only ...
- 1
0
votes
0
answers
28
views
Decimal degrees in Main Project Map but not in Print Layout Grid
My main map is in decimal degrees (ex. 122.0610 and 6.9119), but when I try to have a Print Layout, the Grid units are different (ex. 396000.00 and 764600.00). I want to maintain the same grid units ...
1
vote
1
answer
53
views
autonavi / amap xyz tile layer appears shifted in OpenLayers (Chinese Web Mercator with GCJ-02 datum)
I am trying to add an xyz source tile layer to OpenLayers v8.1.
The source URI for the tiles is the Chinese autonavi / amap provider.
http://webrd0{1-4}.is.autonavi.com/appmaptile?lang=zh_cn&size=...
- 2,279
0
votes
0
answers
26
views
QGIS Clip raster bands SCP QGSPointXY(): overload error
What is the cause of this error and how do I remove it? I was trying to execute clip raster bands using coordinates.
An error has occurred while executing Python code:
TypeError: QgsPointXY(): ...
0
votes
1
answer
43
views
How to get a raster dataset to display in correct location
I'm working in ArcGIS Pro (v 3.1.3) and I have a raster .jpg dataset that has an unknown spatial reference system. After building pyramids and statistics, the raster will draw in Arc, however is not ...
- 1
0
votes
0
answers
49
views
Getting NO2 concentrations for a given area
I am trying to get the NO2 concentrations at different coordinates for a specified area.
From the nc file downloaded from sci hub copernicus, I extracted the latitude, longitude and the NO2 ...
- 11
1
vote
1
answer
48
views
Defining a custom central meridian and latitude of orgin for Winkel I projection in QGIS [closed]
I'm trying to redefine the Winkel I projection using the Custom Projection option in QGIS to define the central meridian as -100 (100 degrees west) and the latitude of origin as 40 degrees north. I'm ...
- 19
1
vote
1
answer
85
views
Projecting an old Ordnance Survey map in Cassini-Soldner Grid
I have an Ordnance Survey map of North West England (1921, quarter inch to the mile) that doesn't conform to British National Grid/EPSG:27700. I suspect that the projection might be Cassini-Soldner ...
- 133
0
votes
1
answer
67
views
How do I tie survey data to a coordinate system?
I have Record of Survey drawings from Marin County that I can plot in CAD, but I am not sure the best/easiest way to place the lot lines into a coordinate space. I found some benchmarks in the County ...
3
votes
1
answer
100
views
Creating buffer for MultiPolygon that covers all its surroundings in QGIS
When I try to use the Buffer tool in QGIS, it only allows me to create buffers in degrees ("grados" in the screenshot below) and it does not give me the option of changing the units (to ...
- 31
3
votes
2
answers
84
views
TAB file can't be saved in EPSG:3414 using QGIS
In QGIS 3.22.8 I am trying to convert the file from SHP to TAB. Shapefile has clearly defined CRS: EPSG:3414 - SVY21 / Singapore TM.
When I save it as TAB (CRS defined as well):
I am getting a TAB ...
- 155
2
votes
1
answer
96
views
Sorting coordinates as per polygon in QGIS
I have a list of our sales lead locations in Excel with their coordinates.
What I wish to do is that I need to sort those coordinates as per the condition if they lie within a certain polygon or not. ...
- 23