Andrea,
what about performing a count then add something like this?
If count ==0 then
Bbox = 0 0 0 0
Carlo
Il 21/gen/2014 17:37 "Andrea Aime" <[email protected]> ha
scritto:
>
> On Tue, Jan 21, 2014 at 5:08 PM, Damiano Albani <[email protected]>
wrote:
>>
>> Hello,
>>
>> When uploading an "empty" Shapefile (i.e. with no features), it looks
like GeoServer configures the datastore with bounds being equal to what is
explicitly specified in the Shapefile.
>> And clicking on "compute from data" in the configuration page doesn't
make the value change.
>> So what bounds should be advertised for layers of this kind? All zeros?
That's what OGR does apparently:
>>
>> $ ogrinfo -al empty.shp
>> Layer name: empty
>> Geometry: Line String
>> Feature Count: 0
>> Extent: (19496742305194890055511892394450289164288.000000,
19496742305194890055511892394450289164288.000000) -
(-19496742305194890055511892394450289164288.000000,
-19496742305194890055511892394450289164288.000000)
>> Layer SRS WKT:
>> GEOGCS["GCS_WGS_84",
>> DATUM["WGS_84",
>> SPHEROID["WGS84",6378137,000,298,257223563]],
>> PRIMEM["Greenwich",0.0],
>> UNIT["Degree",0.0174532925199433]]
>> ID: String (10.0)
>> ...
>>
>> $ ogrinfo -sql 'RECOMPUTE EXTENT ON empty' empty.shp
>>
>> $ ogrinfo -al empty.shp
>> Layer name: empty
>> Geometry: Line String
>> Feature Count: 0
>> Extent: (0.000000, 0.000000) - (0.000000, 0.000000)
>> Layer SRS WKT:
>> GEOGCS["GCS_WGS_84",
>> DATUM["WGS_84",
>> SPHEROID["WGS84",6378137,000,298,257223563]],
>> PRIMEM["Greenwich",0.0],
>> UNIT["Degree",0.0174532925199433]]
>> ID: String (10.0)
>> ...
>>
>> I know it doesn't make much sense to work with empty Shapefiles but I
have to handle this case, having a user-exposed GeoServer.
>> More precisely, I have an application which queries GeoServer for layers
information and then feeds it to OpenLayers for WMS rendering.
>> And I can confirm that OpenLayers really chokes on extent values like
the weird one shown above :-)
>
>
> GeoServer does not have a way to dodge the values contained in the
headers and do a manual scan.
> It would be possible to implement it though, but it would have to be
optional, scanning thorough large
> data sources can take ages (as in hours, and during that time, the admin
interface is locked)
>
> Cheers
> Andrea
>
> --
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more information ==
>
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> @geowolf
> Technical Lead
>
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