Questions tagged [geolocation]

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

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Vincenty's formulae to calculate in MySQL and PHP

I was reading Haversine formula on wikipedia and at the end of article its state that "More accurate methods that consider the Earth's ellipticity are given by Vincenty's formula and the other ...
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616 views

Generate map coordinates to be on streets

I have a PHP program that generates a certain number of random coordinates on a map in a specified radius. I want check which points are positioned in a user-accessible area such as a street; not on ...
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40 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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359 views

How to add heading to position using openlayers 3?

I've seen the geolocation with tracking example in OL3, what it does is it rotates the view depending on the heading of the device. I've done some research on the web and all what I've found does the ...
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1answer
161 views

OpenLayers 3 - only call code on geolocation in IE11 if user allows it

I have a geolocation control in OpenLayers 3. The problem is that when clicked in IE11, the user is prompted for permission to geolocate. I want to pan to the geolocation position if and after that ...
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133 views

ArcGIS how to geolocate/georeference raster data arrays? [closed]

How does one geolocate (or georeference) a raster of swath grided data with separate lat/lon arrays and multiple data bands using ArcMap 10.3? A sample data file (*.h5) can be downloaded from here ...
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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 ...
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429 views

Using Python-Flask-MongoDB with Geolocation field running on App Engine?

I'm trying to write an app which would act as a address caching API, so basically it needs to store addresses (geolocations) and later on I could query on a random address and radius and get all the ...
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1answer
365 views

Where can I find tower information

I want to find geolocation with GSM Cell information. I need tower information to find locations and calculate triangulation. I tried OpenCellID service but I think it's not up to date. I can't find ...
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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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How can I ask for location and display it on map on my website? [closed]

I have added a map to my website. Now I want to add a feature to it wherein when a user clicks on the add event button on the header a popup should appear which ask for event name and location and as ...
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2answers
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Generating random points near a location [closed]

In the following solution, why is there a sqrt(u)? Since u is just a random number in [0, 1) doesn't getting the sqrt just give you another smaller random number? To generate points uniformly, ...
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1answer
5k views

Geolocation is not working on my mobile device (USER DENIED GEOLOCATION) - Openlayers 3

I have the Openlayers 3 Geolocation API working on non-mobile browser correctly, but I get 'User Denied Geolocation' error testing on mobile devices. What could be the reasons of this error? If it ...
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0answers
692 views

how to transfer GPS device coordinates into mobile android app?

i'm trying to make an android app that collects data field in high accuracy, since the phone native GNSS doesn't provide highly accurate coordinates, i want to use Coordinates provided by a real GNSS ...
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1answer
383 views

QGIS geolocate a csv (insert point for each record manually in map)

I have a CSV with data (no location, no lat/long). I need to load that CSV into QGIS and create a point for each feature. I've trying for an hour without success.. I guess there must be a way to ...
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1answer
319 views

Using Gazetteers to mine locations from text

I am starting to work with Gazetteers and trying to find something that will actually "mine" geospatial locations from sets of text. Academically, this is a difficult task as texts are based on ...
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1answer
387 views

Openlayers 3 - click under geolocation layer

I am using geolocation feature of Openlayers 3.13, as in the examples. (http://openlayers.org/en/v3.13.0/examples/geolocation.html) However I also have queryable point layers, and when I track the ...
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1answer
49 views

Searching by location

I need an advice for a service. On our website we have a search for events. Users are especially interested in the location of event so they use that filter a lot but the problem is that in our ...
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1answer
336 views

Where can I find a list with beaches which include coordinates?

I use World Weather Online marine API to get wave height of different beaches. This API provide data by coordinates and I need a list with coordinates of beaches.
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1answer
1k views

Does this DXF file contain geolocation data?

I'm new to autocad and have been sent a file with polylines which I need to plot on a map. However I cannot see that the file contains any geolocation data to plot it accurately. The GeoLocation tab ...
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1answer
375 views

Keep only the last marker when geolocating

I'm working with OpenLayers 2 and I managed to create a javascript to locate the users and it works fine. I added a marker representing the current location and when the position change, it creates a ...
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3answers
716 views

How to display geotagged photos in leaflet

There is awsome plugin of displaying geotagged photos in leaflet Photos on leaflet I used the picasa photos implimentation when I implemented the plugin for my picasa public album photos link in ...
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2answers
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Move leaflet polygon to given position

I have a circle and a polygon that I'd like to move to the user's local position. I managed to move the circle latLng but I can't find a way to do the same thing with a polygon. Can someone help me ...
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1k views

change easy.button to get the location of user

I want to add a button to my leaflet that zooms to the position of the user. I can't figure out the right way. This is what I tried: L.easyButton('<img src="myimage.png">', function(btn, map){ ...
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1answer
514 views

add marker to geolocate button

I'm doing a map to describe trekking paths and I need a button for the geolocation function. I saw ol examples about custom control, button and geolocation, and using the drupal geolocate button I ...
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2answers
698 views

How to find multiple centers of gravity?

Say I have a number of customers in a geographical area, marked "c": Each customer has a Lat/Long. I would like to find x number of points, in the same space, that best serve the customers, ie. they ...
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658 views

Get all locations of Panoramio photos in a given extent

To create a visual quality heat map I'm trying to get a list of all Panoramio photos in an about 2000 Km2 wide study area. My idea is to perform a density analysis in GIS on a point shapefile ...
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1answer
53 views

Choosing aesthetic location over physical location?

I am in the process of putting together an infrastructure map for my city. We have received some engineering maps (and CAD files) that are assisting me in my task. I have also gone out and gathered ...
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1answer
267 views

Sectors pointing to a lat long [closed]

Is it possible to find which sectors of a site are pointing to a specific lat long at a distance away?
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2k views

Getting random coordinates based on country

Are there any webserveices/APIs that can take a country name and return a random coordinates (not including the sea/ocean sections) inside that country?
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1answer
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How to determine when mapview zoom level has changed using Mapbox-iOS-SDK?

I am using Mapbox-iOS-SDK 2.1.2 and I need to know when the user changes zoom level on the map view. I know how to get the current zoom level, but I don't see any delegate methods for determining ...
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1answer
80 views

Creating random points within polygon from database?

Although I have a solution for it in ArcGIS named Hawth's tools, but I wanted to know whether it is possible in QGIS or not. Additionally, I am not having a lower version of ArcGIS on which I can do ...
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1answer
1k views

Calculate road distance between GPS points

I am working on tracking system that track location of vehicles on the map and tell their total distance from the beginning till today. I have device_id, timestamp and GPS location in the table like ...
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1answer
163 views

Publish a Locator Service with a place-name alias table

I am trying to publish a locator service with support for a place-name alias table, in ArcGIS for Server 10.3. It should function similar to the Esri World Geocode Server which allows users to search ...
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0answers
461 views

How to directly get a Google API map based on a cell tower object

How do I pass a cell tower object to the Google Maps JavaScript API or Embed API to get a map for wherever the tower happens to be? I realize that I can accomplish the task in two steps by first ...
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1answer
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How can I get one neighbourhood name using address and/or postal code?

this is my first time here. I just need to get a neighbourhood/locality name, to get it I have the address and postal code (all over Argentina). -no polygons needed- This is to change a background ...
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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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186 views

QGIS geolocate a DBF file with another point layer by matching field

I have a DBF table and a SHP with points. I want to geolocate the DBF file using the points layer. Both match in a field called "unificationstring". I know how to do it in postgis but how can this be ...
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1answer
3k views

How can I geocode American rural routes and box numbers?

I am working on a project where users fill out an online form with address information and a Google Map centered at that address is displayed. It works fine for traditional addresses (e.g. 123 Main ...
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Set of intersection points in trilateration / multilateration [duplicate]

Like in this post I will get a set of points (3 or more) with latitude, longitude and distance (in KM) information to find out the target location. A distance could be about 500 KM. The circles (...
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0answers
145 views

project hdf file with geospatial_lat and lon in batch process

Is there any way that I can do a batch process in projecting hdf files wherein I could get and include only the geospatial_lat and lon in the batch script since every hdf file have different ...
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0answers
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Geofencing: Query if a POINT is within a POLYGON

I am trying to use the following query to search if a point is within a defined POLYGON (aka a geofence I want to define): https://spatial.virtualearth.net/REST/v1/data/[DataSourceID]/[...
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5answers
497 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
529 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 ...
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2answers
270 views

Using LocateButton with Tracking enabled

I have been using esri's LocateButton on a map for almost a year now and it works well. I'm now trying to enable the Tracking option to create a moving map for staff and I can't seem to get it working ...
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1answer
283 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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1answer
73 views

I want to trace a gps device

I want to create a device that should transmit its location to a server using anyother medium other than GSM. Bascially I need a tracking device which i could give to my worker and he goes to a forest ...
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1answer
1k views

Yandex Navigator / Maps - Determining user location

Kindly redirect me to a more appropriate forum in case there exists one. I am an active user of Yandex.Navigator App (available for all kind of mobile platforms). Whenever I open the App, even though ...
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2answers
5k views

Does iOS know the phone's location solely from cell tower, i.e. without GPS data?

Question Does the iOS operating system know the phone's location even if one could turn off the iPhone's built-in GPS module or if it was broken? Elaboration What I understand I understand that ...
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1answer
417 views

Looping a location-allocation problem in ArcMap's Model Builder

I have developed the model below in which I iterate through a series of values for a variable in the Location-Allocation type of problem. The variable is the number of facilities to solve. The model ...