Add feet to latitude and longitude?

Question

Add feet to latitude and longitude?

Answer 1

Am I presuming properly, that given 2 variety and longitude coordinates, you want to discover the shortest distance between them and likewise the bearing (clockwise attitude from north) from one factor to the different? if so, i understand of three suggestion on the thank you to do this, yet i will't bypass into all that except you enable me understand (the two via digital mail or via utilising 'additiional information' interior the question) if my presumption is real or no longer. as an example, the shortest distance from la (34.0522º, -118.2428º) to Pasadena (34.1478º, -118.1436º) is 8.seventy one miles (the line is an element of an incredible circle) on an preliminary bearing of 40.64º. If that's what you require, then please enable me understand.

Answer 2

You need to convert to some other format first.



Generally the most reliable method is to first convert from LLA (Lat, Lon, Altitude) to ECEF (Earth centered, Earth fixed) and then convert from ECEF to ENU (East, North, Up).



Assume the LLA is in WGS 1984 unless otherwise stated.



The actual equations for this aren't very nice, http://www.dsto.defence.gov.au/publications/2443/DSTO-TN-0432.pdf gives you everything you need but may not be very easy to follow.

Or right click on the page Big Daddy gave, select view source and convert their javascript into whatever language you are using.

Answer 3

Do you need to do this once or do you need to come up with a method? Yes, converting to UTM would let you more easily do the calculations in one sense, but converting to UTM isn't trivial.



If you just need to do a few points, here's a calculator. In the middle of the page you can put in a lat/long and a distance and a direction to compute a second point.



http://williams.best.vwh.net/gccalc.htm



EDIT:

If you're doing the conversion yourself, try this reference:

http://www.uwgb.edu/dutchs/UsefulData/UTMFormulas.HTM