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Geographic Information Systems

Questions tagged [latitude-longitude]

Angular geographic coordinates that specifying the north-south and east-west positions of locations.

612 questions
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1answer
45 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
14 views

Bar chart of capitals by latitude in 5 degree increments in the lower left of the figure [on hold]

Trying to figure out how to plot a bar graph with my lat and long data (minus Alaska and Hawaii)... The bar graph also needs to be in 5 degree increments. Here is my code so far for the 3 part image.....
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0answers
14 views

Seeking UK reverse geocoding API to pinpoint house numbers from lat longs? [on hold]

Is there a UK reverse geocoding API that can pinpoint house numbers from lat longs?
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7 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 ...
1
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1answer
37 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
34 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
38 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
27 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
51 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-> ...
1
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1answer
44 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 ...
1
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0answers
31 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 ...
1
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1answer
72 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
31 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
31 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.
0
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1answer
117 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 ...
1
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0answers
58 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
62 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
45 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....
1
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1answer
54 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 ...
1
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1answer
29 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....
1
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1answer
133 views

How to truncate coordinates (LonLat) to decimal precision - OpenLayers 2

For eg. 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
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2answers
667 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
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1answer
39 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
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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 ...
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2answers
298 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
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1answer
166 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 ...
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2answers
477 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
442 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
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1answer
199 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, -...
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1answer
33 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
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1answer
83 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
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1answer
62 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
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1answer
45 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. ...
0
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1answer
114 views

Calculate row and column for WMTS request from Lat/Long

I'm writing a request to a WMTS server that has an upper left corner at 90, -180 and spans the whole Earth. I want to get a tile containing some point (targetLat, targetLong). Suppose we have some ...
1
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0answers
68 views

Getting coordinates ASCII file? [closed]

I want latitude longitude information as an ASCII file for a location of my choice in 1 km resolution. The picture shows data for each grid point. Now I want the lat long info for each grid, also as ...
1
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2answers
611 views

Reverse Geocoding in QGIS

I have a point shapefile with Latitude and Longitude attributes with more than 1000 features. I want to add street address data in the shapefile by Reverse Geocoding but the Geocoding plugin has no ...
0
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1answer
85 views

Listing all exact Degrees, Minutes, Seconds for an entire area

Does a database or dataset exist that lists all exact Degrees, Minutes, and Seconds (rounded to nearest decimal) for the continent of South America? What I am seeking is a list of DMS's that covers ...
2
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1answer
52 views

Does longitude/latitude info come directly from GNSS chip on Android devices?

I'm trying to directly communicate with the GNSS chip on my device and I am not clear whether the RAW GNSS information is coming directly from the GNSS chip or not. I have used the application ...
1
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0answers
99 views

Coordinates to Lat/Long Conversion

I'm trying to convert a GeoJSON Coordinates Point to latitude and longitude format, but I don't know exactly which is the format they have or which is the coordinate system they are expressed in. I ...
0
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1answer
325 views

Mercator map coordinates transformation formula

I have a third-party application with a city map of size 131072x131072. There are data on this map which contains x and y coordinates. I want to transform these coordinates to latitude and ...
2
votes
1answer
109 views

Differences in angle measurements in Web Mercator

I am trying to measure different angles on 2D map using lat/lon coordinates taken from Google Maps, and Java library JTS. I have noticed a weird thing: my measurements are always distorted, except ...
1
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1answer
25 views

Using “Difference” geoprocessing tool on Big Data taking a very long time

I am using QGIS Bonn 3.2.3. I've recently been using the Difference function to calculate a list of points and it is taking a terribly long time. I was wondering if you could point out any obvious ...
4
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3answers
130 views

Draw Bounds with coordinates in QGIS from CSV

I have a CSV file that contains 4 coordinates on each line, 1 min latitude, 1 max latitude, 1 min longitude and 1 max longitude. These 4 points delimit a particular region(they are the bounds) I would ...
0
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1answer
76 views

Using latitude,longitude of point and distance in degree to get another point?

Suppose I have latitude and longitude of a point and a distance in degree, how can I get to the other point? (Suppose the point to find is aligned horizontally or vertically)
4
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2answers
582 views

Defining Latitude and Longitude before defining Datum?

Reference material: The Five Key Ingredients for Mapping the Earth There are five important steps to producing a map of the Earth's Surface. These are: sphere with north and south through the ...
2
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2answers
952 views

R shapefile transform longitude latitude coordinates

I want to find out the coordinates (latitude and longitude) of Texas precincts. I download the shapefile from here. I am using R to read the file and extract the coordinates: dsn.tx <- "~/.../...
2
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0answers
96 views

ArcPy approach to add lat/long to CSV for multiple sets in one row [closed]

I have a CSV where each row contains 3 sets of coordinates in EPSG 32611 (UTM). I'd like to add columns that contain the coordinates in lat/long (EPSG 4326) also. So, columns H&I would be cols. B&...
1
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1answer
951 views

Latitude, longitude, projections, CRS

I'm confused about the following basic points: Do lat/long points have a projection or are they projection agnostic? Do these points live in a sphere or a plane? I understand that projections are ...

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