Questions tagged [geolocation]

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

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27
votes
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 ...
2
votes
1answer
1k 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....
14
votes
4answers
10k views

Calculating the distance between a point and a virtual line of two lat/lngs

Please refer to the example and corresponding image. I would like to achieve the following: provide two locations (lat/lng), which are shown below as A and B. From this, a virtual line would be drawn ...
28
votes
8answers
62k views

Generating random locations nearby?

I am trying to create random locations nearby my location. What i want is to create random latitude/longitude pairs inside a 200 meters circle surrounding my location. This is the formula i came up ...
8
votes
10answers
4k views

Device for Logging GPS and Accelerometer Data? [closed]

I am looking for a device that can track my location (lat,long) and speed all day long. Perhaps, I need GPS and accelerometer data bundled together. What I want to do is to log my daily activities. I ...
36
votes
3answers
32k views

Best GIS system for high performance web application - PostGIS vs MongoDB

I am working on a web/mobile application based on location data. Since i am already familiar with MongoDB, i found the geospatial indexing of mongo is quite suitable for my needs. As i am mainly ...
22
votes
4answers
49k 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 ...
23
votes
2answers
7k views

How much sense does it make to average (lat,lon) samples in order to increase 2D accuracy of a GPS location?

Several GPS applications, like this one, or this one, acquire multiple (lat,lon) samples of a given location, assuming that the GPS unit is not moving, and then take an average of the samples in order ...
2
votes
3answers
1k views

GPS and GIS for real time monitoring of an object

How is it possible to store coordinate of object in server in real time using feasible hardware ( can be used by student) GPS into database and retrived in real time?? What are the names of ...
7
votes
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 ...
3
votes
3answers
422 views

Display millions of points in the browser

I have a web application which will track he movement of user, and save the history location to database. And user may want to see his/her movement trace over a period of time, we have to display ...
5
votes
2answers
463 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?
4
votes
2answers
3k views

How to calculate midpoint given north/south latitude and east/west longitude?

First, sorry if this questions sound very simple. I am very new to GIS. Given four values of north/south latitude, east/west longitude how to calculate the center point that is correct for all cases ...
2
votes
1answer
206 views

What sub-meter geolocation solutions exist and how can I integrate them into a web and mobile mapping workflow?

I am the manager of seven water systems. What I am trying to do is map out every meter and valve on to a map and then my workers can have the maps on their iPhones so when they have to go fix a water ...