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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