Questions tagged [geolocation]

Geolocation is a means to discovering the physical location (in real-world geographic terms) of an object.

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1answer
186 views

Collecting Lat-Long in a Google Docs Form by adding script?

So I need am trying to figure out a way to collect Lat long data and have it saved automatically when I fill a Google form on my phone. Is it possible as retracing address to plot is not possible for ...
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1answer
86 views

ISO 3166-1 alpha-2 Country and region location in coordinates

I am doing some mapping that requires country and region average coordinates. I've found this very useful table with the coordinates of countries, their ISO 3166-1 alpha-2 code and the average ...
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1answer
35 views

Avoid overwriting the style of a marked cell in Leaflet & Javascript

I have a system where I mark cells with different colours if a geoposition has been obtained within a cell. My issue is that due to the continuous update of geopositions, cells that were marked with ...
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1answer
298 views

External GPS feed for HTML5 geolocation API in django-leaflet?

My goal is the following: I'm developing a Django project. The goal is to locate places with a form. I'm using a CreateView generic view (maybe I should create it manually for more customization. 3 ...
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1answer
71 views

Combining GPS and WiFi geolocation

I see that Google combines GPS with WiFi geolocation results to increase location accuracy. Does anyone know how it's done? How is WiFi information useful when it can have 10m+ accuracy? Is it only ...
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0answers
33 views

Comparing 2 GPS location data files to find if any location from one file is within a specified elliptical region of a location from another

I have 2 CSV files with GPS coordinates. I want to check if there are any locations in the first file which are inside a specified elliptical region surrounded by each location in the 2nd file. The ...
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1answer
51 views

User tracking on a defined route

I am having a vehicle route with a set of latitude and longitude values. User need travel on the specified route, If user deviates from the route (greater than 100 meters), we need to identify in ...
2
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1answer
196 views

How to move geolocation in OpenLayers 5 programatically

My geolocation in OpenLayers is incorrect by more than 5000 meters. I want to correct this issue, how can I programatically move my geolocation to the most accurate location? Or is it even possible?
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27 views

Identifing specific plants out indexmaps (pixelgroups) and convert to .shp

I am working on a project where I have to identify a specific plant (it is toxic) in fields. I made a high resolution Orthomosaic (1,4cm7/px) and created a vegetation index where the plant I am ...
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1answer
31 views

Checking Position History with WiFi?

I've just read this article about geolocation history and wifi https://www.pcworld.com/article/3315197/free-wi-fi-hotspots-can-track-your-location-even-when-you-arent-connected.html If I clearly ...
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4answers
8k views

How does WiFiSLAM work?

Apple recently acquired WifiSlam. How does their technology work? Their website doesn't go into much detail. Allow your smartphone to pinpoint its location (and the location of your friends) in ...
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6answers
4k views

What algorithm should I use for wifi geolocation?

School Pickup Use Case (update) It might be helpful to go into a more concrete use case instead of the original backyard example below. Local law enforcement has started cracking down on use text ...
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2answers
24k views

Trilateration algorithm for n amount of points

I need to find algorithm that can calculate centroid A (aka gravity center, geometric center, center of mass) from the figure where circles T1,T2,T3,T4,T5,..,Tn intersect AND length of line R from ...
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0answers
30 views

Leaflet catch window position

This is what I want to do: When loading the map, it will first grab the window coordinates of the current screen, and then load the data points of the current screen. The next screen is as ...
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0answers
32 views

Converting latitude/longitude into a slab number (or item number) and vice versa?

Purpose: To compress the data transmission for the longitude and the latitude. Initially these datas are in the form DD.MM.mmmm: degrees, minutes, ten thousandths of a minute. Latitude stands under 28 ...
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3answers
632 views

Seeking tools to write smartphone application for bus map? [closed]

I noticed that few cities provide a bus map for smartphones. As a result, tourists usually resort to just taking the subway instead because it's easy to figure out, although riding a bus is a better ...
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0answers
48 views

Move polygon to new location (find new lat-lng coordinates)

I need to move my polygon (region of geographical area) with 4 different (O1, O2, O3 and O4) lat-lng coordinates (as shown in the figure) to another place, so that I get new values of all 4 lat-lng ...
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4answers
50k views

Seeking Country/State/City Database? [closed]

I am creating a directory which uses locations to categorize all listings. Instead of relying on user input, I'd like to provide a list of locations which the user can select. I have already tried ...
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1answer
53 views

API that can give the latitude and longitude ranges from the address

Is there any API available that can get the latitude and longitude boundaries from the address. For example if we provide: 12380 Sunnyvale avenue, CA, 90005 Can we get the latitude minimum and ...
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1answer
62 views

Opening and Using .tif and .twf files in QGIS

I have in the same folder .tif and .twf files with the same names. How should I open them in QGIS correctly? If I select add raster layer and add the .tif file, would that be enough? Would QGIS also ...
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0answers
37 views

Calculating Points of Inaccessibility

With limited skills in this area, I'm looking for someone who might be able to help me calculate the Points of Inaccessibility for various regions such as a country like Germany, a state like Florida ...
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2answers
3k views

Checking if a geocoordinate point is land or ocean?

I got the corner geo coordinates from a xml product file of a Sentinel-1 GRD SAR image. When looping through the pixels of the image I wish to check whether it represents land or sea. I figured I ...
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0answers
28 views

Construction Lines offset when added to fabric

We use geo-positioned CAD data then copy paste survey accurate data into our Parcel Fabric. When we convert them to new parcels, the points move off the correct location by two to 5 feet. What ...
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0answers
13 views

Well Locations in NAD27 do not overlay well locations on aerial or satellite images, i.e. Google Earth

Well Locations in NAD27 do not overlay well locations on aerial or satellite images, i.e. Google Earth. Computations are based on accurate locations and would like to know if it is better to place ...
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2answers
94 views

Seeking data of worldwide shore lines and bathymetry?

Is there a free database with all geolocations for shorelines? Is there a free database for near-shore bathymetry data?
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1answer
117 views

How to determine which point lies in which polygon from a list of multiple polygons

I am new to python and currently working with Json file and I need to determine the location of each tweet and represent the grid in which they are present with the count of tweets in each grid cell.I ...
2
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1answer
2k views

Unable to warp HDF5 files

I have numerous HDF5 files(.nc) which I need to batch process warp using one of the gdal utilities gdalwarp. When I tried to warp the files an error occurred: INPUT: gdalwarp -geoloc -te 109.975 3....
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1answer
564 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 ...
3
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1answer
2k views

How to get the best GPS position Geolocation API

I want to get the most accurate position of my mobile phone with android. I'm comparing accuracy value in 2 seconds interval and if value is less than last value I'm trying to keep the position in <...
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1answer
282 views

Creating custom input text in CartoDB?

What is the best way to modify the searchbox listener searchbox in the CartoDB map? I would like to disable the default event listener for the CartoDB searchbox and first to execute my own listener ...
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0answers
110 views

How to create a map-based survey with drag-drop capability?

I am an urban planning master student. I need to create a map-based survey for my research. The survey should allow users to drag some different points from the toolbar to the map showing next to it. ...
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0answers
42 views

How can I access the user's location in my Google Earth Engine script?

I'm working in Google Earth Engine and I want to access the user's location to then be able to use the position when visualizing data layers. When running the code below, GEE doesn't seem to be able ...
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1answer
277 views

How to get GPS location in OSMDroid without Internet connection?

I made a little app in Android using OSMDroid library, my map is loading from assets. Now I want to put my GPS location on that map, but without using Internet connection. I found these ...
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0answers
20 views

Get exact address of mobile device using geocoder

I have been trying to get exact address of mobile device using geocode. Here is my code function showPosition(position) { debugger; console.log("Latitude: " + position.coords.latitude + "<br>...
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1answer
31 views

Accurately tracking location in outback? [closed]

I am looking for a way to efficiently track my whereabouts/tracks whilst traveling through the Australian bushland. In the past, I've just recorded my longitudes and latitudes from a basic GPS onto a ...
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0answers
229 views

Parse GPS track data into 10 sec intervals

I have a GPX track containing latitude, longitude and elevation data. The recordings are done by a Garmin device and have been recorded in varying intervals (between 1 and 44 seconds). I would like to ...
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2answers
1k views

Open source location allocation modelling

I'm looking for open source tools for location allocation modelling (eg planning public health facilities). Preferably in a GIS environment. I know GRASS somewhat, but v.net.alloc doesn't seem to ...
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0answers
38 views

Is the accuracy or PDOP included in smartphone or GPS camera?

I would like to properly geolocate picture Exifs on a smartphone or GPS camera and would like to record the accuracy of the GPS position as well. I have downloaded a few photos from camera review ...
3
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2answers
5k views

Socket Server to receive GPS location data

I am working on a web application which receives data sent from trackers via TCP Packets containing location information. Up until this point we have been working with dummy data within the mysql ...
5
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0answers
82 views

Calculating centre of city? [closed]

A lot of career websites allow you to select jobs from within a radius of your chosen location. Since cities and towns can be considered irregular in shape, sprawling in the definition (do you ...
3
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1answer
312 views

Leaflet.locate: permission error on different browsers

I inserted a simple button for geolocation into a Leaflet-generated map by adding L.control.locate().addTo(map); into my HTML file. In Chrome and Firefox it works great, Safari and Internet ...
3
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1answer
10k views

How to convert distance into latitude + longitude [duplicate]

I have start point (latitude) I know direction, lets say strictly north, and I want to calculate latitude which is 100 meters above the start point. The same for longitude. I believe there should be ...
2
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0answers
30k views

Free API or database for Continent, country, city, region/state? [duplicate]

Is there a database or API that can provide: Continent, country, city and region/state? It should also have the country codes in ISO format. It would also be great if if could all be in one file for ...
1
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1answer
524 views

Using CartoDB to detect user location and put dot on map? [closed]

I have a CartoDB question. We have a project we are piloting in Rio das Pedras, Brazil, a favela near Rio. We have sampling points, working on adding Fulcrum photo uploads and some pretty bad road ...
19
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1answer
638 views

Why are geolocations on Twitter “rounded”?

I'm plotting some geolocations (lon, lat) of tweets collected using the Stream API with a 7mi. radius. The picture below shows two maps of the same data, but using different alpha/transparency for ...
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1answer
46 views

Geolocation using global map in ArcGIS Desktop? [closed]

I want to show my study sites (15 from different countries) using a global map in ArcGIS Desktop. I'd like to show latitudes and longitudes (perhaps with a map grid). Is there a way to drop pins ...
2
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5answers
487 views

Some companies receiving GPS data from vehicles when GPS cannot send any data?

I know that some companies offer tracking services for vehicles such as live GPS tracking they can access any time, but as you can't use the GPS protocol to send any data i wonder how the do it... I ...
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1answer
497 views

Displaying markers within viewport for different country in google map?

I have multiple location. One is from Netherlands and one from India. How to display both country marker in google map view port? Currently only Netherlands markers are displayed. So I have to drag ...
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1answer
10k views

Leaflet How To Update User Position Marker Real Time

I am trying to update user position in leaflet. Like when the user walks with their phone their location marker will move too based on location data just like Google Maps. Right now I'm just putting ...
2
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1answer
1k views

Masking land with matplotlib basemap in Python?

I've been trying to mask land with .is_land from mpl_toolkits.basemap. When running following code: map = Basemap(llcrnrlon = 7.298914095230308, llcrnrlat = 58.98235690451632, urcrnrlon =...