Questions tagged [geolocation]

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

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Standard(s) to store and share geolocation and 3D orientation data for an object, e.g. a raster

As an example, GeoTIFF is a great standard to embed geolocation data into a raster file for cartographic purposes. But in that case, raster files are usually supposed to be on the projection plane. ...
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Determining Correlation Between Land Degradation and Grazing Location Data in Google Earth Engine

I am currently working with a linear regression map of a known range land area and a csv of grazing location points in Google Earth Engine. I am hoping to determine if there is a correlation between ...
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25 views

How do I create a map with many locations and a driving time radius around each point? [closed]

I'm trying to do a research project for a company I'm working for. We have a lot of locations and we are curious to see what our accessibility numbers are based on a 30 minute driving radius. ...
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29 views

Define point locations in relation to slope [closed]

I have a dataset of settlements that I would like to put in relation with slope and aspect layers that I have made to see if there is a preferred altitude or direction (facing north or south, etc.) ...
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28 views

Get the begin and end coordinates of city municipality

I am not sure if this is the right place to ask this question. I would like to have an idea of precise coverage (extend) for the latitude/longitude of the city of Porto, Portugal. This is in ...
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Set Browser location dynamically to random location

I am working on a program that is supposed to run on a mobile client and track the location. However, as I am implementing on a non-mobile desktop client, I would like to have something like a chrome ...
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Searching geodetic databases for historical landmarks in Canada by Station names (or numbers)

I am interested in historical landmarks within Canada. I have a Station name ... Station 08U1209. I would like to read what information is available about it from our Canadian Geodatic database, but ...
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180 views

Python function to get the co-ordinate pair of a point

I am trying to geocode a point shape. But first I want to determine the coordinate pair of the point shapefile before geocoding. The error I get is: **ERROR** :ValueError: Must be a coordinate pair ...
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37 views

Sorting by distance in MySQL

I found a sample of code SELECT * FROM locator WHERE SQRT(POW(X(center) - 49.843317 , 2) + POW(Y(center) - 24.026642, 2)) * 100 < radius in this question Find points within a distance using MySQL....
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158 views

Export user location in Leaflet

I want to use the following Leaflet function: # Generated using folium <!DOCTYPE html> <head> <meta http-equiv="content-type" content="text/html; charset=UTF-8"/> <...
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77 views

Determining XY location [closed]

I am new to a system and the information it gives me for job sites is XY(238391648,71539666):294616358697. I have been trying to use convertors to change this to a longitude and latitude definition ...
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68 views

Optimizing/reducing geolocation data for speeding up visualization [closed]

I have an application that receives geolocation data from clients (cars) every minute and shows this on a web page (like owntracks). The data is stored simply in an SQL database - 1 point is 1 row, ...
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How to prepare oneself to show a polyline based on latitude and longitude information in a csv/json file with heatmap information too? [duplicate]

I am quite new to working with JavaScript as well as geo location systems. I am looking for an open source JavaScript library to show - on the web - something very like the running trackers show you -...
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79 views

How to download point locations as GeoJSON using Leaflet JavaScript in Django

I want to download point locations from Leaflet js map with Django backend as data collection. When I click on the map it makes a marker and redirects to page http://127.0.0.1:8000/static/data/...
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119 views

Determining if two locations are duplicate

I'm working on an app that will display drugstores in a map. I have a table that has all drugstores, each with its Lat/Lon. We used several different sources to add the data to the table: the ...
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How to find the coordinates (longitude, latitude) of a point in an aerial image? [closed]

I will be receiving drone images from an associate. It'll have longitudes/latitudes values from the corners of the image. I don't have access to his image processing S/W. It'll be in a relatively ...
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118 views

OpenLayers GeoLocation.getPosition() is inconsistent

In my mobile application I am using OpenLayers and trying to capture current position of the user by using GeoLocation.getPosition() method. The method sometimes returns position and sometimes return ...
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80 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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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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41 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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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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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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186 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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1answer
640 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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59 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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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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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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295 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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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
2k 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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584 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 ...
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228 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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78 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
604 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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1answer
39 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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45 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 ...
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1answer
2k 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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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 ...
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1answer
132 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
50 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 ...
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1answer
606 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 ...
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1answer
100 views

Placing Excel Data in ArcMap/ArcScene similar to Image Georeferencing

I have XYZ-dataset of Temperature Data in Excel, with no (Lat, Lon) added. Every time when I try to display the Data in ArcScene the Programm tells me, that a Spacial Reference is missing (of course)....
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411 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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Determine geograpic coordinates from one fixed location as accurately as possible without expensive hardware

I build a GPS disciplined oscillator and I need to set antenna coordinates in order to be able to operate it as accurately as possible. What I need is a way to determine the geographic coordinates (...
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250 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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198 views

Display and manage (CRUD) point cloud in (Geo)Django 2

I would like to use GeoDjango to Geolocate the place I will scan. Would start to 3D scans with a DIY lidar based on Arduino/Rpi. So far no worries. Then, The Goal is to save x,y,z as input in ...
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774 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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209 views

GDAL, Geolocation Arrays, and Overflow Error?

I'm trying to use GDAL to create raster images from NOAA GSIP L2 data products. By looking at the provided NetCDF files from NOAA, it appears that geolocation arrays are provided. I tried following ...
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1answer
707 views

openlayers 3 and geolocation without HTTPS

I am creating an application where user can locate himself on map. the code is working fine in local development environment, but when i deploy it over server(IIS) the code won't work. here is code : ...
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708 views

Openlayers 4 Geolocation is not working

geolocation: function () { var self = this; self.geo = new ol.Geolocation({ trackingOptions: { enableHighAccuracy: true }, projection: self.Map.olMap....

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