How to calculate the UTM-Latitude-band?

Question

I have to convert a coordinate from UTM to MGRS. I think I have the most of it covered, but I have some difficulties to calculate the correct Latitude-band. How can I decide which band the coordinate has?

Answer 1

I use:

zone = math.floor ((lon + 180.0) / 6) + 1

Bear with me on that, and I'll check my library

So if

lon = -35
lat = 35

Then zone will be 25, which I think is correct. Try it and let me know if it works for you.

There is also:

andrewlesley.freeserve.co.uk/gps/convertr/UTM-MGRS.html

I am sure you can get into the JS and use the code.

var UTMzdlChars="CDEFGHJKLMNPQRSTUVWXX"; 
function UTMzdl(latDeg) 
{ 
    if(-80<=latDeg&&latDeg<=84) 
    {
        return UTMzdlChars.charAt(Math.floor((latDeg+80)/8));

    }else 
    { 
         //Not normally reached 
         alert("No zdl: UTM is not valid for Lat "+latDeg); 
         return ""; 
     } 
}