Question

I have a (DB2) database table containing location information, one column of which is a CHARACTER(16) and contains a single hexadecimal number. I have a program that displays these as points on a map, but no access to its source. Changing the numbers moves the points on the map — I just don’t know the algorithm.

Some examples (edited to include more):

04867C279DE2D6EC -32.063657°  115.7658683°
04867C27C030085E -32.0633982° 115.7649085°
04867C27C230A5FE -32.0633846° 115.7653336°

Are there any standard ways that this is done? Is this some DB2 convention or something? Any ideas on how I could figure this out?

Thanks!

Answer 1

This could be morton codes.They are used to pack coordinates in one dimension.

Generating a Morton number is easy. All you do is convert the x and y coordinate numbers into binary. Then “interleave” the bits to get the Morton number. It does not matter which goes first, but you must be consistent.