My point is to find a way to make the computer do the lookup (I have a long list of grid refs covering 3 different publications that I want coords for). I stumbled across the following whilst reverse engineering a map server last night (I didn't say that
).
Javascript grid ref to UTM converter - for educational purposes only ...
// =======
// ZOOMUBD
// =======
function zoomUBD(ubdmap,col,row){
// window.status="29 "+new Date().getTime().toString();
// Window to a UBD reference
var e,n,map,sp,special,maplc;
maplc=ubdmap.toLowerCase();
sp=UBDSpecial.indexOf(maplc+"~");
special=false;
if (sp != -1) {
// Special Case
if (sp==0) {
map=119;
special=true;
} else {
map=((sp-6)/5)+21;
}
} else {
map=parseInt(ubdmap);
}
if (map < 119 || special) {
// First part
e=269500+Math.floor((((map-21)%20)+2+col/15)*3750)+125;
n=Math.floor(6293000-((Math.floor((map-21)/20)+row/16)*4000))-125;
} else {
e=269500+Math.floor((((map-119)%20)+col/15)*3750)+125;
n=Math.floor(6293000-((Math.floor((map-119)/20)+5+row/16)*4000))-125;
}
// Window to the UBD reference
wx1=e-125;
wy1=n-125;
wx2=e+125;
wy2=n+125;
if (!allowStretch) {
adjustToTile();
}
redisplay("zoom",0,true);
}
) for converting sydway, ubd, gregories ... grid references (map number and grid such as 236 B7) to coords. Obviously, they only need to be approximate given the size of grid squares.
But to get you in the general area could work.
Agreed. This list of locations is for finding things bigger than caches.
