>Hi, Dirk, and thanks for the reply.
>
>>best way
>>
>>make a Table with all Cities and Zipcodes
>>in the web you can find this including the GPS coordinates of the City(center) serch for "zip code City GPS"
>
>Hmmm. Well, this is a driving-distance calculation, where the result is being
>used to calculate the cost of shipping a given item. I'm not really sure if
>a point-to-point approach would be accurate enough for our customers, being
>that they are shipping large, expensive pieces of equipment for long distances,
>and as we all know, direct, point-to-point distances can be a lot shorter than
>driving distances. For this reason alone, I've been searching for a public domain
>database that includes road lengths and whatnot. Should I find something pubically
>available (probably from some type of government GIS project), I'll let everyone
>know. Not only that, I'll have to set up the database table and hack the code for
>the calculation, so I'll make sure that I post the code here, along with the
>table.
>
>>we have a function that will calculate the distance with the GPS coordinates.
>
>Kewlness. Long/Lat is a nice way to go.
>
>Anywho, Dirk, thanks for the info. Very informing, and I'll ask the powers
>that be if estimation via point-to-point calculation is good enough. Maybe
>I'll get lucky :^).
>
>Best Regards,
>
>Randall

Randall,

How are they shipping, by commercial carrier or some other means? If commercial carrier, you should be able to get zone definitions and rates from them that will tie into zip codes.

Regards,