Nope... not the way I meant it. For the first and second optimizations, you would limit the lat/lons to the following yellow square.
That would be a bit conservative and would cover even the adventures of "Wrongway Peachfuzz" :-D. If you really want to narrow it down quickly, you can use the more radical "mid point" approach as follows (again, use the yellow square limits):
--Jeff Moden
RBAR is pronounced "ree-bar" and is a "Modenism" for Row-By-Agonizing-Row.
First step towards the paradigm shift of writing Set Based code:
________Stop thinking about what you want to do to a ROW... think, instead, of what you want to do to a COLUMN.
Change is inevitable... Change for the better is not.
Helpful Links:
How to post code problems
How to Post Performance Problems
Create a Tally Function (fnTally)