Questions tagged [geolocation]

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

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989 views

Want to access android location services in a leaflet.js project running in a webview

I am running leaflet.js project on my android app using a webview. Everything is great but for current user location leaflet uses GPS because it runs in a webview and as we know webview is extention ...
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46 views

Getting error while assigning Geolocation to raster

I am using VIIRS imagery EDR dataset and trying to give Geolocation to Brightness Temperature layer by creating VRT files of Longitude, Latitude and Brightness Temperature layers given in HDF5 dataset....
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67 views

Urban positional accuracy of Google Streetview [closed]

How does Google Streetview have accurate locations in urban environments, such as in tunnels, below buildings and next to buildings?
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1answer
34 views

Summing attribute values from many points geocoded on same location using ArcGIS Desktop?

I have geocoded a batch of addresses and many of these are geocoded on the same location. Now I want to keep just one point on each location but sum the field values of all points from the same ...
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165 views

Not able to figure out what is wrong with geolocation or projection in upoaded raster

I am working on VIIRS SDR dataset. I had different layer of Brightness temperature, latitude and longitude in given .HDF5 dataset. Using reference from http://geoinformaticstutorial.blogspot.in/2014/...
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1answer
34 views

GIS different coords

Could you, please, explain me the difference between two types of coordinates: [-11539.488377739675,6710096.017961704] and 51.4977973,-0.2691569 These coordinates represent London location, but ...
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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 ...
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1answer
2k views

How to map fence post holes to reality?

I'm looking for a good technique to take points, which mark the locations of fence post holes, from a Google map layer to then precisely mark with paint where to drill the holes. I noticed that my ...
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How to include long.vrt and lat.vrt into bt.vrt as x-dataset and y-dataset respectively, Using python?

I am using following code to create bt2.vrt file using python. import numpy as np import gdal from gdalconst import * import osr # Function to read the original file's projection: def GetGeoInfo(...
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79 views

Finding River Lots in Alberta, Saskatchewan and Manitoba using QGIS?

I have to border farmlands in Canada (Alberta, Saskatchewan and Manitoba). Usually they give input in the form of DLS like SE-9-56-22-W4.So I use https://locator.scadalink.com/dls2latlng.html to find ...
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1answer
320 views

Showing user's location on Carto map?

I have a series of tram stops on a Carto map and would like to indicate the user's location. Is this doable in Carto? https://jamieparker.carto.com/builder/161cab96-859b-433d-8a72-5ae5653b1b8e/...
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1answer
142 views

Can I use avaraging to pinpoint the exact location of a stationary GPS device?

I have a simple Android app that keeps track of users' location, using the following setting of the LocationManager to avoid constant updates and thus battery drain minTime = 60sec (minimum time ...
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648 views

Warping Image having Lat Lon Geolocation array

I'm trying to implement a script to project an image having the two matrices of Lat and Lon points. I've followed the steps proposed in: Unable to warp HDF5 files and everything is fine. I create the ...
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1answer
484 views

projecting INSAT3D L1B data from HDF5 to Geotiff

I am attempting to use gdal to project a set of geostationary INSAT 3D L1B images. I tried to follow the steps in Unable to warp HDF5 files I created the .vrt files using gdal_translate -of VRT ...
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36 views

Interpret terrain type from height data and/or geolocation

I have downloaded a large subset of the STRMGL1 Dataset, and have further split each entry down into 5km by 5km tiles. I now need to start classifying each tile by terrain types. Are there any ...
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1answer
1k views

Extract Polygon Coordinates from Shapefile data

I have some building data (polygons) as a shapefile in QGIS 2.18. I'm trying to add a location coordinates (the polygons rough center) and an array of the polygons coordinates (its points). I've been ...
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2answers
165 views

Extract longitude - latitude from GIS generated map embedded in website

Is anyone clever enough to extract longs and lats for the points shown at: https://www.northernpowergrid.com/generation-availability-map What would be even better is finding out if those points hold ...
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582 views

Retrieve geolocation and image url from Blob in MySQL

I have a web form that collects three items: name, notes, and a geotagged img and stores it in mysql. The image is stored as a blob. I would like to scrape/access the blob's geo-location properties ...
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1answer
4k views

OpenLayers 3: Zoom and center at map startup

I have a simple map setup and I've been reading the documentation to find out how to set the center and zoom at the current geo location. I initialize my map's view to center at [0, 0] with zoom of 2, ...
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1answer
792 views

Improve leaflet location interval

I'm using leaflet 1.0.3 with latest plugin leaflet-locatecontrol. When I start to locate myself, it takes arround 5 seconds. My position is being watched constantly and even if I move right after the ...
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2answers
347 views

Correcting inaccurate position coordinates

How to project the journey onto the street? The black polyline is inaccurate GPS data received from a mobile device, which positions the user trajectory inside the buildings, when it was actually on ...
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379 views

GIS data visualization

I have a huge data set with geolocation information. I am trying to visualize the data but the tools cannot handle such a big graph. Size of the file is about 5GB and has more than 3 million rows. ...
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1answer
85 views

Assigning bars to closest building using PostGIS?

I'm using PostGIS and OpenStreetMap, I tried to assign some bars to the nearest building from themselves I based myself on an example, see: link You can see below picture that resulted from below ...
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1answer
1k views

Plot points by longitude and latitude on a map created by centroids

I'm searching for a way to plot some points for which I have the longitude and latitude (using Google Maps API) on a map created with centroids. I succeeded to do it by using functions such as ...
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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 =...
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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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1answer
5k views

Adding a control for geolocation in Leaflet

In my Leaflet app, I am trying to add a simple geolocator control on my map. I am following the instructions from https://github.com/domoritz/leaflet-locatecontrol. I am already using Leaflet control (...
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1answer
199 views

Address locator alternative for ArcGIS Online

I do not have a license for ArcGIS Server. I created an address locator using my county's centerline data. I edited my school boundaries so they "snapped" to those centerlines. Now when I do ...
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1answer
298 views

Does Geolocation Understand Global Variables?

I am using navigator.geolocation.getCurrentPosition(success, error); to get the user's location in an https web page. I have also defined var map; ...as a global var. The success function gets called,...
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1k views

Achieving more accurate geolocation

Currently, I am using Google Maps API with HTML5 geolocation to create a POC about asset tracking via a web service. The user opens the web browser and we track it from there and display it on an ...
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2answers
479 views

Changing the geolocation of a point in the map

I uploaded a vector layer with points = cities. After zooming in I found out that some cities are on wrong places. How can I change the geolocation for a specific point, city?
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1answer
490 views

Attribute table of a point: longitude, latitude info missing

In my QGIS map I have several vector layers. They all appears on the map well. I am just wondering, where in the Attribute table I can find the information about the geolocation. I supposed that in a ...
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1answer
265 views

Using QGIS how to extract single polygon co-ordinates in multiple polygon data?

I have polygon coordinates for complete India at district level and I want to just use 2 or 3 districts out of complete polygon. For example : I want to just select district Pune and Nasik and need ...
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232 views

Identify Health Centre Location using machine learning ( Optimisation ) [closed]

I am trying to identify locations of where new health centres could be built in the country using Machine Learning (optimisation) and R programming language. I currently have the latitude and ...
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94 views

Can someone point me what's the type of encoding used in

I am trying to understand the type of encoding used to represent a poly line on earth from here.com Platform Data Extension service requesting ROAD_GEOM_FC layer. "LAT":"5013674,12,12,16","LON":"...
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2answers
1k views

What does the U mean in UTM=(32, 'U')?

I've come across code which specifies UTM=(32, 'U'). Is there a common convention around UTM I can understand this through, or is there not enough information here to determine the geographic location?...
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2answers
987 views

How to store geolocation in tabular Oracle without using Oracle Spatial or Locator?

I'm working on a project to link existing entities in an Oracle database with their geolocation, but the database is a tabular not spatial. Is there a compatible type that can store the geolocation ...
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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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28 views

Adding Composite Geocoding Database

I'm following an MIT tutorial I found here: https://libraries.mit.edu/files/gis/geocoding.pdf, to try to add a locator to ArcMap. However, as I am not an MIT student, I cannot get to the step where I ...
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98 views

photo2shape QGIS 2.1x

I'm stuck on a problem with photo2shape in QGIS 2.1x (I already tried several versions). I installed Exif Reader and photo2shape worked fine for me. Since last week QGIS crashes as soon I start ...
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1answer
312 views

qgis2web: In which files are the zoom buttons?

Can anyone help me out in which files (in an exported qgis2web project with OpenLayers3) the zoom buttons are specified? Or directly, the geolocation button? I do a project for school with qgis2web, ...
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1answer
2k views

How to toggle custom geolocation marker in OpenLayers 3?

I've managed to to add a geolocation marker to an OpenLayers 3 map that reflects the actual position and accuracy of geolocation. I got a custom button on the map to start the geolocation, but how ...
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1answer
6k views

Dynamically update position of geolocation marker in Openlayers 3

I've followed the instructions of the following post: l3 (OpenLayers-3) add geolocation marker to add a geolocation marker to an ol3 map. The probem is, that the mentioned post ends up with proposing ...
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1answer
1k views

Assign geolocation to var before sent to server

Im a javascript learner and have some trouble with my script i hope someone has time to help me. In short I want the script to get position of user, save it to a variable and send the position of an ...
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1answer
2k views

ST_Within and ST_Contains not working for Latitude and Longitude in PostGIS

I have a table "tbl_location" in PostGIS which has latitude and longitude, so I created a new column called "point_location" : update "tbl_location" set point_location = ST_Transform(ST_SetSRID(...
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1answer
1k views

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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1answer
587 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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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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0answers
341 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
160 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 ...