Questions tagged [latitude-longitude]
Angular geographic coordinates that specifying the north-south and east-west positions of locations.
920
questions
0
votes
1
answer
20
views
Use Georeferencer GDAL plugin on QGIS to create a GeoTIFF if the latitude and longitude boundaries are known for a raster image
What I have/know:
I know the latitude and longitude boundaries for an image
I am using the EPSG:4326 projection
QGIS with the Georeferencer GDAL Plugin Installed
Is it possible to create the ...
- 115
0
votes
1
answer
31
views
Negative Easting while converting long/lat to UTM zone
I have a dataset of some points in python which have longitude and latitude for each of them. Because they are located in different UTM zones, when I want to convert them to UTM, I will get some ...
1
vote
0
answers
28
views
QGIS - Setting out a grid of points within a predefined area and giving them specific lat/long values
I'm basically re-learning GIS on the job, so forgive me for any inaccurate terminology or methodology etc. I will try to be as clear and concise as possible.
I will be collecting the lat/long values ...
- 11
0
votes
1
answer
26
views
How can I get the longitude and latitude of a specified pixel (e.g. equal to certain value) with Google Earth Engine?
I want to get the longitude and latitude of a specified pixel (e.g. equal to a certain value) using Google Earth Engine. In other words, I have used "ee.Reducer.min()" to get the minimum ...
- 11
1
vote
1
answer
60
views
Dividing a map into zones based on latitude
I'm new to QGIS and I'm trying to divide a map of the world based on latitude. The final result, I need a shapefile or a raster file where multiple zones are created based on latitudinal zones. Is ...
- 29
0
votes
1
answer
49
views
Calculate UTM grid convergence using UTM coordinates
What would be the simplest way to arrive at a value for UTM grid convergence for a point given in UTM coordinates?
All advice I can find requires that the point be given in latitude/longitude. For ...
- 316
1
vote
0
answers
56
views
How to find the standard deviation in GPS measurement of latitude and longitude?
Let's say my GPS configuration is said to have a precision of 10 meters. I have taken this as the standard deviation in the GPS measurements. But the measurements that come from GPS are latitude, ...
1
vote
1
answer
36
views
Geotools unable to transform EPSG:5359 to EPSG:4326 , returns NAN for coordinates
I am using geotools to transform a set of point in chile EPSG:5359 to world EPSG:4326
I am using below code
transform("6884327.77", "447076.76");
static Coordinate transform(...
1
vote
1
answer
45
views
Calculate poygon area in km2 from degrees to km2 in R
I found this but I think it is possible.
I am trying to calculate the area in Km2 of a polygon given by the vertices in degrees:
library(pracma)
x= c(-40.03953, -44.24278, -40.90583, -35.55361) #those ...
- 23
0
votes
0
answers
25
views
From UTM to long/lat [duplicate]
I have a set of points expressed in the UTM zone 32N EPGS:32632 WGS84 and I would like to obtain long/lat expressed in -90/90 180/-180 degree.
Is there a way to obtain it with Qgis?
For instance:
- 75
4
votes
1
answer
443
views
Creating square polygon around center of the point using Python
How do I create a square polygon using center of the point (lat/lon) 25 kilometers (KM) by sides?
I am not looking for a radius i.e. buffer. Here I am creating edges of 25 KM from the center point ...
- 143
1
vote
0
answers
40
views
What coordinate system uses three places for decimal minutes for longitude values?
I have data from a navigation unit that is reporting coordinates where the latitude is in a familiar decimal minutes format (e.g., 26° 14.12345’) that never has the number of places (I,e., the 14 in ...
- 11
0
votes
3
answers
143
views
Creating geometry from lat/lon column using Python
I used the code:
import geopandas as gpd
geom = gpd.points_from_xy(dat['lon'], dat['lat'], crs=4326)
dat = gpd.GeoDataFrame(data=dat[['value']], geometry=geom)
but I receive the error:
CRSError: ...
- 21
0
votes
1
answer
82
views
Radius in nn2() in RANN package
I was trying to use the solution offered here to find all the location from df which are within the 70 km distance from my point of interest userLocation=c(6.9,55,2), but it does not work properly.
...
- 115
2
votes
1
answer
40
views
How can I convert the GPS coordinate to find local geographic longitude, lambda?
Let's say I have a coordinate of 59.3536 N, 18.0578 E.
How can I calculate lambda (local geographic longitude) from the given value to calculate solar time?
ST = LT - 4 * (15deg - lambda) + ET
where ...
0
votes
1
answer
29
views
QGIS Y-Axis grid repeating values
I've set up a grid on a map in print layout. The X-axis labels are working correctly but the y axis is repeating the results:
The options selected are shown in the following two photos:
- 87
1
vote
1
answer
57
views
Understanding latitudes longitudes and angles
I am very new to geographic concepts.
I already know and understand the concepts of latitude and longitude.
What I am trying to find is the angle between two points having those points data.
First I ...
- 121
0
votes
0
answers
16
views
Finding closest matching data between two 2D lat/lon arrays
Let's say I have two different lat/lon/data arrays with varying dimensions between the two sets of arrays. For example, lat1 has a spacing of 0.01 degrees of latitude, while lat2 has a varying spacing ...
- 31
2
votes
1
answer
36
views
Exporting random points inside polygon as coordinates with lat/lon in QGIS
I have created a points layer in QGIS using Vector > Research Tools > Random Points Inside Polygon.
However, I would like to export the points as a GeoJSON file where each point has a coordinate ...
- 225
3
votes
1
answer
159
views
Populating geom using lat/long or x/y
I'm having trouble populating a geometry (geom) column by using already existing columns (the data has an x, y, as well as lat, long columns) the 4 columns are in varchar. I have created the geometry ...
- 31
1
vote
1
answer
45
views
Creating a spatial join for longitude/latitude data to areas on a base map
I have three different sets of data: The basemap (local authority wards), crime (recorded through longitude and latitude), population (recorded by local authority ward). I have already mapped the ...
- 19
0
votes
1
answer
100
views
Find the distances between stores with Lat/Long Coordinates in Python
I have a SQL query that pulls the Lat/Long values of all stores.
How do I find the distances between all stores in the column that is returned from the query? Is that even possible?
First, I imported ...
- 1
0
votes
0
answers
82
views
How is the XY error (m) for GCPs/checkpoints in Agisoft Metashape calculated?
I have a project in Metashape where I am using 8 GCPs and 1 checkpoint. The selected coordinate when importing GCP survey is WGS84 (EPSG::4326).
My school advisor, who is a GIS expert, but has limited ...
5
votes
2
answers
266
views
Calculate raster cell area as function of latitude?
Raster used available here: https://www.dropbox.com/s/xn7hdll2op5zcc9/MAP_global.tif?dl=0.
INTRODUCTION:
The resolution of a raster is commonly related in degrees, e.g.:
library(raster)
r <- ...
- 67
0
votes
1
answer
54
views
Latitude represented as a Matrix
I have some NetCDF data where I have a few variables
lat : dimensions - (x,y)
lon : dimensions - (x,y)
x : dimensions - (x,)
y : dimensions - (y,)
temp : dimensions - (year, y, x)
I am struggling a ...
- 219
0
votes
2
answers
351
views
Create grid with equal spacings R from specific latitude and longitude
I would like to create a grid of 8 points with lat lons (2 x 4) each 200m apart using a specific point as the start, e.g., top left of the grid. My starting point is Latitude 51.83985301, Longitude 0....
- 495
0
votes
1
answer
48
views
Missing address in OSM file
I downloaded a part of germany .osm file from geofabrik and extracted all ways and nodes whose tag contains addr-key using osmfilter:
osmfilter.exe hessen-latest.osm --keep=addr:*=* --drop-relations --...
- 1
0
votes
1
answer
162
views
SQL Server: Coordinate conversion from NZTM to WGS84
I got a table that has shape value in one of the columns. I am converting shape value into geo_json formate and calculating centroid value and saving in two columns. The coordinate system of shape ...
- 183
1
vote
2
answers
135
views
Problem with cartopy when a shapefile as lon > 180
I am trying to make a figure using a shapefile and cartopy.
When longitudes are in the range [-180,180] everything is working fine
When longitudes are in the range [0, 360] the shapefile is not ...
1
vote
1
answer
48
views
PostGIS: given two points and the max distance in meters find if the two points are within that distance
Given latitude and longitide of two points I have to find if them are withing a given max distance in meter, I found this function:
https://postgis.net/docs/ST_DWithin.html
and I am using it in this ...
- 113
0
votes
1
answer
79
views
QGIS coordinate system in meters
I am new to working on spatial data. Someone sent me a series of coordinates x,y in meters of particular locations in London. Here is an example:
X (m)
Y (m)
534849
177512
The person was able to ...
- 161
0
votes
0
answers
21
views
Given the lat long of the centre of a rectangle, how do you get the lat long of the bottom left corner of the rectangle [duplicate]
I have the latitude and longitude of a point. This point is in the centre of a rectangle that is 2miles wide and 8 miles long. The rectangle has an azimuth (angle from north) of 35degs. How do I get ...
- 1
1
vote
0
answers
91
views
Calculating diagonal end coordinates in latitudes and longitudes, if midpoint coordinates and distance is known, using ArcGIS Pro
I am using ArcGIS Pro.
I want the coordinates of top left end and bottom right end of a diagonal of a square, and I know the mid point of the line joining them and the length of side of the square ...
- 11
1
vote
0
answers
188
views
Executing minimum distance between random samples in python
Right now, my code finds random points within an area and appends them to a variable that I can export as a file. Next, I want to make sure that no two points are within 100 meters of each other.
I've ...
- 157
1
vote
0
answers
41
views
Extent incorrect after using affine and rasterio to write image
I'm using rasterio to write data to a TIFF image. The original data was extracted from a TIFF image, that was projected in UTM 17 North, or EPSG 32617. I'm writing the data to EPSG 4326, and am also ...
- 21
1
vote
0
answers
213
views
Convert a single point (lat, long) to raster-projection from a tiff file, and finding the nearest pixel
I have a TIFF file and a list of coordinates, of which I'd like to get the information from the TIFF file for each coordinate. I'm quite new to working with geodata, but after a bit of searching I ...
- 11
1
vote
0
answers
97
views
How to change the extent of raster layer to lat lon in QGIS?
For species distribution modelling I am working in R with rasters obtained from QGIS. To be able to work with my data, both my rasters and point variables need to be saved in similar extent format. ...
- 11
0
votes
2
answers
141
views
SF Collection Plots in lat/long but Geometry is Not
I'm using urbnmapr to get a county base map. I want to plot my own points on top of this map. Even though the urbnmapr map plots with lat/long on the x y axis, the lat/long points that I want to plot ...
1
vote
0
answers
487
views
transform latitude and longtitude to pixel coordinate
I am trying to draw latitude and longtitude unit polygon on an image. Firstly I converted latitude and longtitude to pixel coordinate by these codes:
#Coordinates of the image that was taken by ...
- 11
0
votes
0
answers
332
views
Leaflet JS: How to check if a Lat/Longitude is in proximity going away from the original point?
I am trying to generate a route where each point in the route has progressively a lower elevation than the last point.
So a route would look like this:
[A, B, C, D, E]
So E, would be lower than D ...
3
votes
0
answers
283
views
How to compute weighted mean centroid of lat+lon points taking into account spheroid
I have a bunch of points (lat+lon coordinates). Each one has a weight. I would like to get a weighted mean centroid of the points, taking into account the spheroid (as my points are scattered across ...
- 125
1
vote
1
answer
323
views
Converting X/Y coordinates using pyproj giving incorrect results
I have two CSV files which I have to merge and the only thing common I found was one of them has coordinates of six points for polygon.
and the second file has x, y coordinates which is the only ...
1
vote
1
answer
308
views
Calculate GPS elevation angle (Python)
I have two GPS points (Latitude, Longitude, Altitude) the distance between the two points is a maximum of 50 kilometers. How can I calculate the elevation angle? (I want to implement the whole thing ...
- 11
0
votes
0
answers
26
views
How to determine the area size of a terrain for which I want to calculate its roughness
I want to calculate the wind speed on the ground for a specific location. In order to do so I will use the log wind profile. One of the input variables of this formula is the surface/terrain roughness....
- 119
1
vote
1
answer
123
views
Polygon coords are backwards
I have been given a delimited text file with a series of polygons representing areas in the UK. I have a column labelled WKT_LatLong and the column contains the polygons. When I import the data it ...
0
votes
0
answers
16
views
EM31 Scanner WGS84 Lat Lon DDMM.SS how to convert?
I normally can convert the .xyz data sent to me from someone using an EM31 scanner, but they recently sent me a file with coordinates that I don't recognize. How can I display coordinates that seem ...
- 1
0
votes
1
answer
69
views
Utilizing ArcPy InsertCursor to populate lat/long field using a for loop
I am writing a script that populates a field full of Lat/Long coordinates and most likely should be a tuple. Originally I just created a Lat/Long tuple pair nested within a list and set equal to a ...
- 61
0
votes
3
answers
108
views
Adding Lat/Long Coordinates to Frame in Print Layout
I am still learning how to use QGIS: I am making a map of a location in Antarctica, so I am using WGS 84/Antarctic Polar Stereographic coordinates (EPSG:3031). I have put the map into a print layout ...
- 1
-2
votes
1
answer
143
views
Finding intervals of latitude/longitude of cities throughout the world at 0.01° precision [closed]
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° ...
- 39
0
votes
0
answers
168
views
Create lat-lon mesh grid from MODIS HDF4 file GDAL
I have a Python code that reads HDF4 files for different satellite products. I am having issues obtaining the underlying grid that it uses.
In panoply I can see the variables XDim and YDim that have ...
- 187