Latitude, Longitude, Center Point

Hi, I need to find out how to know if a given point expressed in actual latitude and longitude is inside a box.  The box is also expressed in actual latitude and longitude:

UL_LON = upper let lon
UL_LAT = upper left lat, etc


(UL_LON, UL_LAT)               (UR_LON, UR_LAT)
+---------------------------------------------+
|                                                         |
|                                                         |
|                             +                          |
|                 (PT_LON,PT_LAT)              |
|                                                         |
|                                                         |
+---------------------------------------------+
(LL_LON, LL_LAT)               (LR_LON, LR_LAT)

How do I find out if (PT_LON, PT_LAT) is inside the square.  


thanks in advance.
ramrocketAsked:
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ozoCommented:
If the sides of the square can be sufficiently approximated by loxodromes, you can use any point in polygon algorithm.
If they follow great circles, it can get a little more interesting near the edges.
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ramrocketAuthor Commented:
Can you please provide me with a formula to do this.
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ramrocketAuthor Commented:
ozo,

in the funtion:

int pnpoly(int npol, float *xp, float *yp, float x, float y)

what are the values in these arrays xp and yp???
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ozoCommented:
UL_LON
UR_LON
LR_LON
LL_LON
and
UL_LAT
UR_LAT
LR_LAT
LL_LAT
0
ramrocketAuthor Commented:
ah got it.
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