Tagged Questions

The process of determinating absolute or relative locations of points by measurement of distances

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Calculating polygon area or sphere surface area after knowing vincenty distance between start geo stamp and current point?

I'm really new to GIS, so I'm asking a basic question. I've already got the Vincenty Distance between start geo stamp and current point. Since I also want to implement a triangulation or ...
19 views

walk me through tdoa [closed]

I'm working on a TDOA application. This is just something in my free time to see if my hardware can accurately do it and it sounded like a cool challenge. Regardless if it looks possible or not, I'm ...
613 views

Trilateration algorithm for n amount of points in R?

I read the page Trilateration algorithm for n amount of points and I have to do similar kind of trilateration in R. I am not that expert in R, can anyone help, if there is similar function/package ...
121 views

Trilateration with error account or lack of precision

I am developing a node.js/javascript application where I would have dozens of beacons in a row (positions known), which gives me their distances to specific object (3 or 4 distances per object). The ...
56 views

Trilateration based on weighted least square

When using weight least square method for trilateration, a weight matrix W is to be determined. In the case where the distances to three reference points are prone to error, how should the W matrix be ...
365 views

Plotting points that have relative coordinates rather than total station coordinates on map?

I have about +100 points of various descriptions from an archaeological survey. They are the backlog from years of excavations BEFORE systematically using Total Station at the site. For each artifact ...
31k views

Differences between triangulation and trilateration?

Looking around I noticed that many people interchange the terms (triangulation and trilateration) for the same sense. What is the correct sense of Triangulation and what are the differences from ...
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What is the method used by wikipedia to solve Trilateration problem, is it the Linear Least Square? or is it just a direct solution of a set of linear equation systeme with exact distance? but in this ...
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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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How can I use ArcGIS 10.1 to find a geodesic equidistant point defined by three points?

For example, I have coordinates for three base points on a coastline and I need to find the coordinates of the point off the coast which is equidistant from all three. It’s a simple exercise in ...
8k views

Converting from an x-y coordinate system to latitude/longitude

I'm building an indoor wifi-based tracking system that can calculate the position of a device in meters relative to the sensors distributed throughout the building. So far I've gotten to the point ...
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Calculate an intersection point of multiple spheres on the surface of earth [duplicate]

The question i am going to ask is very much similar to this question-How to calculate the intersection of 2 Circles? But the problem here is, the radius of the spheres are too small (within 8 meter). ...
444 views

localization by trilateration ( weighted nonlinear least squares )

I am writing an app for beacon localization and I am looking for a formula which, given beacons of known positions and distance from target, finds the target position. eg. given beacon1 located at (...
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Trilateration using 3 x,y points and 3 distances, all in cm [closed]

I want to find out the position (x,y) of a given point, knowing the distance from 3 x,y points. Below you can view the x,y coordinates and their given distances in cm. B1x = 795 B1y = 332 B1d = 245....
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Trilateration Calculation Issue

edit I was able to do this following partially from this solution: How to calculate the intersection of 2 Circles? I broke it up into 3 groups of intersections AB, AC and BC. Once I had those I took ...
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Trilateration on a Sphere, given 2 points and 2 distances

Given the points: A) N 38° 38.000 W 90° 20.000 B) N 38° 39.000 W 90° 21.000 (I can calculate the distance between the 2 using a spherical earth model as 7710 feet, though it's not particularly ...
260 views

Trilateration using two or three points

We have a positioning system where we can measure our range without 0.1m from multiple beacons. The placement of the beacons is about on a 1-2km box. So we could get anywhere from 2-4 ranges from ...
213 views

How does the radius work in Trilateration

I've been trying to understand the trilateration algorithm based on the wikipedia article. As of now, I have a system where I have the distance of 3 sensors wrt my position and i have the exact GPS ...
161 views

Bilateration using longitude, latitude

I have 2 coordinates (Longitude and Latitude) and a distance from them to a third coordinate. How is it possible to calculate the longitude and latitude (probably 2 possibilities) of the third ...
2k views

Multilateration Code

I am currently writing some code to do multilateration using TDOA and currently struggling and wondering if anyone has any reference code that can be used as a test case with some sample data that I ...
371 views

I would like to locate (position) people inside buildings without forcing them to download a native app. I'm focusing on iOS and Android devices. I therefore thought about wifi triangulation (...
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Given distances from two locations how to accurately find geographic coordinates [duplicate]

I am working on a research problem which requires me to calculate a geographic location accurately (with error distance of few meters), given distances from two geographic locations. For instance: ...
927 views

Trilateration Math Check

I'm trying to crate an indoor trilateration program working off of N BLE objects. Where I have any number of beacons in a room and my ipad can track its location within them to a sub meter degree of ...
626 views

Trilateration issue

My program isn't making use of any geographical data, but I'm hoping that the users experience in the subject can help me with my current issue. The project I am working is trying to locate a user in ...
400 views

Math algorithm for n amount points in objective-c

I need some information about the Answer on an earlier Question. I need this calculation for an iOS App. I have three points with different Circles. I understand the problem and your solution. But i ...
573 views

Long range Trilateration from 3 lat, long, range

I've been looking at the following solution to a similar problem Trilateration using 3 latitude and longitude points, and 3 distances However with my problem the 3 points are spread over a large ...