SELECT poi.label, ST_Distance(MakePoint(lon, lat), MakePoint(mylon,
mylat)) AS dist
FROM poi
ORDER BY dist ASC LIMIT 4;
-- or --
SELECT poi.label, ST_Distance(geom, MakePoint(mylon, mylat)) AS dist
FROM poi
ORDER BY dist ASC LIMIT 4;
where mylon, and mylat are you arbitray point locations.
-Steve
On 5/23/2014 9:46 AM, Gerry Creager - NOAA Affiliate wrote:
The inherent problem is that the point will be arbitrarily specified. I
need to find the 4 points in the table 'sites' (it has label, geom, and
lat, lon columns) closest to an arbitrary point given a lat/lon
coordinate pair.
Or, am I making this harder than I think I am?
Thanks!
gerry
On Fri, May 23, 2014 at 5:49 AM, Micha Silver <[email protected]
<mailto:[email protected]>> wrote:
Use ORDER BY and LIMIT 4 to get the nearest 4 points:
Assuming your point table is called poi, and it has a 'geom' column,
and a 'label' column, and "lon' and 'lat' give the coordinates of
the starting location, then
SELECT poi.label, ST_Distance(poi.geom, MakePoint(lon, lat)) AS dist
FROM poi
ORDER BY dist ASC LIMIT 4;
On 22-May-14 11:47 PM, Gerry Creager - NOAA Affiliate wrote:
I need to query a rather smallish database and return 4 points
closest to a lat/lon (or lon/lat, if you prefer) statement. I've
been off-line from PostGIS and my skills are worse than rusty
right now...
Thanks
Gerry
--
Gerry Creager
NSSL/CIMMS
405.325.6371 <tel:405.325.6371>
++++++++++++++++++++++
“Big whorls have little whorls,
That feed on their velocity;
And little whorls have lesser whorls,
And so on to viscosity.”
Lewis Fry Richardson (1881-1953)
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Moshav Idan
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cell: 0523-665918
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--
Gerry Creager
NSSL/CIMMS
405.325.6371
++++++++++++++++++++++
“Big whorls have little whorls,
That feed on their velocity;
And little whorls have lesser whorls,
And so on to viscosity.”
Lewis Fry Richardson (1881-1953)
_______________________________________________
postgis-users mailing list
[email protected]
http://lists.osgeo.org/cgi-bin/mailman/listinfo/postgis-users
_______________________________________________
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