Questions tagged [latitude-longitude]
Angular geographic coordinates that specifying the north-south and east-west positions of locations.
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5 views
Reading elevation data from DEM files using memory mapped files?
I'm aware of GDAL libraries but am supposed to not use them.
Is there a way to use mmap or memory mapped files to access the specific longitude, latitude and elevation values from a .DEM file?
The ...
3
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1answer
70 views
How can I extract lat/long from GDB file in FME?
I have a large GDB database of points of interest across the world. I can open this up in FME and the data viewer works great in showing me the content in a way that is easily consumable. Despite all ...
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1answer
40 views
Seeking API/software tool that will return US state senate and state house district number for given latitude/longitude?
I have a bunch of addresses that I need to find the corresponding State Senate and State House district for their latitude and longitude.
It is possible to use shapefiles in QGIS to get this ...
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1answer
55 views
Converting lat long strings to xy linestrings [on hold]
In PostGIS, I have a dataset with road segments including a column with coordinates for the various segments. The coordinates are in a lat-long format and the data type of the column is character ...
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3answers
38 views
Error in Converting XY Coordinates to Lat-Long Using r proj4 Library
I am trying to write a script that will allow my colleagues to easily convert XY coordinates into lat and long. The idea here is to take a spreadsheet with only X and Y available and create a new ...
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0answers
36 views
Determining which latitude and longitude values fall within township/district/polygons
Is it possible to export the boundaries of one layer, as well as the latitude and longitude falling within each boundary, from a program/by programming?
I seem to have gotten fairly close to a ...
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0answers
13 views
Clipping a raster by latitude and longitude extent in ArcMap
How do you clip a raster by latitude and longitude in ArcMap? I have a planetary DEM of Mars: The datum is D_Mars and the xy coordinate system is Equirectangular_Mars. I want to clip this raster ...
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0answers
25 views
Converting Degrees, Mintues, Seconds to X, Y to be plotted into ponts
I need to convert a longs list of Lat/Long (example: N42 30' 45" W122 38' 00") into X,Y data (42.5125, -122.633333) so I can plot it into point shapefile.
Is there a a way to convert multiple records ...
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0answers
41 views
Why does QGIS save EPSG:4326 as long, lat? [duplicate]
Why does QGIS save EPSG:4326 with coordinates in the longitude, latitude format? Isn't the correct standardized format latitude, longitude?
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0answers
42 views
Converting vector in NED to ECEF? [closed]
I have a geodetic WGS84 position, lat, lon, alt, and direction cosines from the same point, uN, uE, uD. I'm brand new to geodetic/ecef conventions. How do I take a vector (say, a unit vector with ...
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0answers
24 views
How to get geographic data of any particular region of map in Geometry datatype format in SQL Server? [closed]
I am completely new to Geometry datatype format of a Microsoft SQL Server database. DataType is Geometry. If not wrong, geographic data contains latitude and longitude of each point of that map, ...
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30 views
SAD69 conversion into latitude and longitude
I have an electricity distribution database in which the coordinates used are in the SAD69 system. I'd like to convert this data to longitude and latitude, but I do not find formulas anywhere. Could ...
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0answers
24 views
Transform ellipse representation from major/minor (meters) to degrees
I am given an ellipse represented by a quadruple (major, minor, center, azimuth) where major,minor are the ellips's axis length in meters, the center is the WGS84 coordinates of the ellipse's center ...
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1answer
97 views
List of lat-long, need values in a raster
Apologies in advance as I am not a GIS specialist by any means. I have a set of 1 million points and I'm trying to find their values in a geotiff raster. I've tried various versions of this answer ...
2
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1answer
49 views
Get weird result when calculating distance between two points, using latitude longitude?
I use algorithm (see: calculating distance between two points) to calculate distance between two points. but it get wrong result, see Java code:
/**
* group1：set latitude to 89
*/
// set ...
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0answers
14 views
Computing center and zoom level for a set of points
I need to duplicate google's static map image API api on an internal server with no internet access using OpenStreetMaps. I did find the OSM Wiki Page covering this topic. I initially looked at OSM ...
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1answer
108 views
Difference between SnakeGrid and latitude and longitude
I am not a geography subject expert and maybe my this comparison make no sense as i don't have enough knowledge (one of the reason to ask this question here).
I have a project where I am doing ...
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1answer
194 views
Latitude and longitude values in Google Takeout location history data sometimes out of range
I've exported my geolocation history data as a JSON from Google Takeout and the latitude/longitude values are out of normal range sometimes. It seems to happen for some locations only, while others ...
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0answers
10 views
Displaying Google Maps by Longitude Latitude Box
I want to display a certain area in google maps bounded by certain longitude/latitude. Meaning that I have 2 points (e.g. bottom left, top right) and this defines the area of the map.
I found parts ...
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1answer
120 views
Why is QGIS not recognising latitude and longitude correctly?
I am importing a simple 5 column csv file into QGIS using Add Delimited Text Layer.
Each row of the table contains a name, a street address, a postcode, a decimal latitude and a decimal longitude, for ...
2
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2answers
39 views
Get DD Lat and Lon from CRS EPSG:3111 - GDA94
I have a shapefile in CRS EPSG:3111 - GDA94 that I am trying to generate Lat and Lon, however when I use the field calculator and try to populate the lat lon I am getting values that I can't use as ...
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3answers
64 views
How to read points value hovering mouse pointer on the points in QGIS?
I am new to QGIS and learning daily, and I find it very interesting day by day. I have come up with a problem here. I stacked points on a sentinel2 image. The points data I imported from a CSV file; ...
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1answer
29 views
How to stack points based on their latitude and longitude value on a raster image in QGIS
I have a Sentinel2 image. I have a CSV file that contains latitude, longitude and precipitation data over the location where the sentinel2 image was taken. Now I want to stack the precipitation data ...
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1answer
105 views
Python - Convert shapefile lat-long value from Degree minutes seconds to Degree decimal
I am processing shapefiles in python using standard library functions like Python “shapefile” library and GeoPandas.
I have two shapefiles having the same projected co-ordinate system-> ...
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1answer
49 views
Converting Point Feature to Latitude/Longitude Coordinate and GPX?
I drew a point feature using the draw tool in ArcMap on a map in an area of interest. I am now interested in extracting the actual latitude/longitude of this point in geographic space so I can ...
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0answers
35 views
How to perform reverse geocoding to custom area on the map?
I know there are services that perform reverse geocoding, given a pair of lat-long and return an approximate address, city, etc.
The problem I have is that given a lat-long, I want to return the ...
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1answer
132 views
Merging several .hgt files into one
I'm currently struggling on trying to combine several .hgt files with different software. I can get the 4 tiles into any kind of software but my issue is exporting the file back to .hgt file.
I've ...
2
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1answer
35 views
QGIS coordinates lost creating polygons
New to QGIS, I'm facing the Problem that my lat, lon information has seemed to be lost creating polygons.
I created layers importing csv files being gps points. From these points I used the function ...
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0answers
32 views
How to get the Lat/Lon coordinates if I am given a table of the MINxy and MAXxy, so that I can map it out in ArcMap?
Right now I have a table that looks a little like this:
and I have the geographic coordinate system they were mapped in, but I need to display them as the polygons that they are in ArcMap.
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1answer
183 views
Extract longitude and latitude from object in shapefile
I'm new to GIS and (ESRI) shapefile. I would like to extract GPS-Coordinates or longitude and latitude from every object in a shapefile, mainly from polygons.
Here is a picture with one of these ...
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0answers
63 views
Visualizing signal strength of mobile towers
I have a list of latitude and longitude along with signal strength obtained from mobile towers in a certain region. I have all the data in CSV format. In total, I have 4 CSV files. I have mapped the ...
2
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0answers
74 views
Problems with latitude/longitude grid in QGIS 2
I try to produce a thematic map in QGIS, like this one done in MapInfo:
I want to do this in QGIS. I work in projection "Albers-Siberia" projection ( PROJ.4: +proj=aea +lat_1=52 +lat_2=64 +lat_0=0 +...
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2answers
51 views
Calculating haversine versus checking latitude and longitude digits after decimal point?
If I want to tell whether 2 points are close to each other, say at proximity of 50 meters, is it OK to compare both numbers up to a certain decimal point, for example the two points:
36.391155, -56....
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1answer
66 views
Converting SHP UTM to decimal lat/long
I am trying to compare a list of lat/long to a shapefile and see which points are in or out of the polygon. I have discovered my shapefile is seemingly giving points in a UTM format. Below are some of ...
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1answer
36 views
Error during MGRS conversion for large latitudes
I'm using Nasa's Worldwind java API to convert MGRS strings to lat/lon. However, when my latitude is greater than 85 degrees or less than -85 degrees I get an error.
java.lang....
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1answer
194 views
Truncate coordinates (LonLat) to decimal precision
For example if coordinates are 17.12345678, -82.12345678, and I want to convert them to 3 decimal digits.
Expected result: 17.123, -82.123
Is there any API in OpenLayers 2 to truncate coordinates (...
2
votes
2answers
874 views
Getting longitude/latitude coordinates from Addresses?
I got a CSV file with more than 15000 address, and I need to show them on a map of the South-West of France.
I've found the MMQGIS plugin on QGIS, but it does so without the right SCR.
Do you have ...
1
vote
1answer
43 views
How to get latitude and longitude for a matrix data using specific projection in R?
I have matrix of temperature data and I would like to get lat and long for this data set in a particular projection
e.g.
PROJCS["DHDN_3_Degree_Gauss_Zone_3",GEOGCS["GCS_Deutsches_Hauptdreiecksnetz",...
1
vote
1answer
72 views
Displaying two separate Excel files on same map? [closed]
I have started to learn ArcMap.
I have two separate Excel files which are:
Border coordinates,
CSD coordinates.
For each Excel files, I have information for longtitude and latitude.
My aim is to see ...
0
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2answers
525 views
Calculation between Raw GPS data to latitude,longitude points?
I am working on the GPS related project. The objective is to understand the calculation process of the raw GPS data (server side calculation). It means " How did we get the latitude and the longitude ...
3
votes
1answer
269 views
Convert X, Y into Latitude,Longitude with unknown system
I have a set of X, Y values that indicate some locations in Hong Kong. But I am not able to convert the X/Y into latitude/longitude since the coordinate system is unknown. Is there any way I can fit ...
11
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5answers
1k views
Calculating correct longitude when it's over |180|?
I'm trying to develop a "formula" to correct the lat-lng values.
I'm using vue-leaflet but when you pan outside the "first" world you get big numbers. Over +180 or under -180.
For example: when I ...
1
vote
2answers
806 views
How to buffer a pair of longitude and latitude coordinates in R?
I have a pair of longitude and latitude coordinates, and I want to plot a 500 meter buffer around it using leaflet or mapview. st_buffer, however, does not correctly buffer longitude/latitude data.
...
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0answers
35 views
How to find longitude and latitudes from easting and northing? [duplicate]
I am using QGIS V3.2. I am working on a project which requires me to plot anchor marks on the seabed. I have the data which is can plot into Excel and save as a CSV or text delimited file and upload ...
2
votes
1answer
993 views
Extracting Longitude and Latitude from shapefile?
I am working with a shapefile which can be found here. I am doing some data visualisation and want to see if certain longitude and latitudes are within a certain polygon in the shapefile.
This is the ...
2
votes
1answer
321 views
Mysterious Lat Long conversion to XY problem using QGIS
I am trying to import a CSV file with Lat Long values I geocoded in Google Earth into QGIS, and I'm getting some very strange results.
A well-formatted decimal-degree Lat/Long pair (like 30.402716, -...
1
vote
1answer
36 views
Area between two longitudes? [closed]
I am trying to compute the area between two longitudes (using the angle between them) but am having a hard time. I can do that more easily between latitudes but longitude reveals to be tricky.
Anyone ...
2
votes
1answer
104 views
Setting up lat/long graticule with 1 min output in QGIS?
I would like to set up a lat/long graticule in QGIS with output being a line shapefile with values in Degrees and Minutes, and grid lines shown at every even 1 minute (e.g. 13°23' W, 13°24' W, 13°25' ...
0
votes
1answer
77 views
Find all regions (lat, long, radius) that contain a point
A Region has a latitude, longitude (GEOMETRY('POINT')) and a radius.
Using postgis, how can I query all Regions where the distance from pointParam and region.point is less than or equal to region....
2
votes
1answer
49 views
Extract values from multiple rasters using lat / long and save as one CSV file
I would like to extract values from multiple rasters with a single lat / long or Shapefile. I have tried every tutorial and stackoverflow post and am getting nowhere. Maybe someone could please help. ...
