[sf-lug] geoprocessing help [Re: sf-lug Digest, Vol 42, Issue 10]

[toya]

> John Reilly wrote:
>> A good place to start looking for geospatial data is the USGS and
>> various agencies that use spatial data.
> Another thing that I probably should have mentioned is that you should
> probably look for WGS-84 based data, although I'd guess that most
> lat/long data out there is WGS-84.  That is the lat/long co-ordinate
> system used by GPS.  Believe it or not, there are several lat/long
> systems and the same point on earth may have a different lat/long
> depending on the co-ordinate system used.  More info at
> http://en.wikipedia.org/wiki/World_Geodetic_System
>
> Cheers,
> John

The software is using / datum/ WGS84 and the lat/long data is to create
a polygon which will mark the borders of each neighborhood.  An example,
this is the data for a neighborhood of the city we are testing in Brazil:

POLYGON((-51.993490154818 -29.463637685188,-51.9929975992176
-29.4631359452736,-51.9922892005093 -29.4623482607523,-51.9904152201333
-29.4603797935915,-51.9886701868564 -29.4589509982135,-51.9865147108895
-29.4572934772796,-51.984064948238 -29.4554095462505,-51.9809189726264
-29.4522897091702,-51.9802952445761 -29.4517176001217,-51.9795817494458
-29.4511708039215,-51.9789160349822 -29.4514942443497,-51.9795437251165
-29.457842414099,-51.9723026722602 -29.4585247922021,-51.9728761115375
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-29.4639205920359,-51.9706225832859 -29.4643554921221,-51.9702529956772
-29.4645023649397,-51.9701324330451 -29.4648276443849,-51.9700111836459
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-29.4642028300027,-51.9927125467914 -29.4639474730853,-51.993490154818
-29.463637685188))


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