On 7/4/07, Brent Wood <[EMAIL PROTECTED]> wrote:
Hi Steve,
Hope this helps...
If I understand you correctly, this may be easier outside of PostGIS
geometries, try:
select geometryfromtext(('POINT( avg(longitude) avge(latitude) ',4326)
group by ....
Always assuming the avg() is a appropriate value to use for your purposes.
I guess I was under the idea that avg() functions don't quite work in
geography for latitude and longitude. Is this not the case?
If you didn't have the lat/long values outside a POINT geometry column, the
same result would be achieved by:
select geometryfromtext(('POINT( avg(X(coords)) avg(Y(coords)) ',4326)
group by...
Cheers,
Brent Wood
> UPDATE table SET coords = geometryfromtext('POINT( longitude latitude
)',
> 4326)
>
> ( 4326 is the projection value that I understand is useful in the United
> States.
>
> So now that I have a bunch of lats, longs, and coordinates, I need to
find
> the center point for any group of them. I can do a select query to get
the
> specific records I'm looking for, and then I can have the list of
lat&long
> points, or the coordinate geometry. How then do I take those rows and
create
> an SQL st
>
>
> UPDATE table SET coords = geometryfromtext(' MULTIPOINT( $lat1 $long1,
> $lat2 $long2, $lat3 $long3)', 4326)
>
> Can I use the 'coords' geometry object instead?
>
>
>
> --
> "Computers are useless. They can only give you answers"
> -- Pablo Picasso
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>
--
"Computers are useless. They can only give you answers"
-- Pablo Picasso
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