On Wed, Dec 21, 2016 at 10:55 PM, David Adler <dad...@adtechgeospatial.com>
wrote:
> In doing some testing of DWITHIN with DB2, I found that it does not
> support the use of a units parameter in a query using a query like:
> query = new Query( "CUSTOMERS", CQL.toFilter("DWITHIN(GEOM,
> POINT(-121.914 37.311), 1.0, kilometers)") );
> DB2 uses the distance value assuming it is in the coordinate system
> units which in this case are decimal degrees which returns a very
> different result from what is expected.
>
> I've been able to correct the DB2 filter so that it produces the
> expected result although I'm not sure if this would change any current
> users of DWITHIN with the expectation that the units are ignored.
>
I would still call it a fix :-)
> It appears that CQL.toFilter() supports only the following values
> "\"feet\"",
> "\"meters\"",
> "\"statute miles\"",
> "\"nautical miles\"",
> "\"kilometers\"",
> It does not support a filter without one of these values.
>
I'd also consider what goes on with OGC Filter (XML).
>
> In poking around the source for other JDBC drivers, it seems that some
> ignore the units and others support different units from those allowed
> by CQL.toFilter().
>
> The PostGIS code appears to support the following units:
> put("kilometers", 1000.0);
> put("kilometer", 1000.0);
> put("mm", 0.001);
> put("millimeter", 0.001);
> put("mi", 1609.344);
> put("miles", 1609.344);
> put("NM", 1852d);
> put("feet", 0.3048);
> put("ft", 0.3048);
> put("in", 0.0254);
> However it doesn't support "statute miles" or "nautical miles".
> CQL.toFilter() doesn't support plain "miles".
>
> The Oracle code appears to support the following units:
> put("metre", "m");
> put("meters", "m");
> put("kilometers", "km");
> put("mi", "Mile");
> put("miles", "Mile");
> put("NM", "naut_mile");
> put("feet", "foot");
> put("ft", "foot");
> put("in", "inch");
> A similarly inconsistent set of units.
>
> Is there a logical explanation for this?
>
Yes, different people doing different things in different times.
(and the reference being the units in OGC Filter, not sure the CQL ones are
a match).
Cheers
Andrea
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