[ckan-dev] RE : Spatial Extension : Datasets without spatial metadata

Wed Jul 18 08:09:45 UTC 2012

Hi,

I understand the reasoning. Indeed, calculation of the similarity of two spatial areas can be a very good feature.

Meanwhile, I prefer to avoid having too large extents and keeping the spatially-undefined datasets (for a better definition later). How can I modify the Postgis query?

Have a nice day,

TIA,

[X][X]
Océane VENTURA
Business Development & Innovation
ATOS - Public Sector Franc
oceane.ventura at atos.net<mailto:oceane.ventura at atos.net>
River Ouest,
80 quai Voltaire
95 877 Bezons Cedex
www.atos.net<http://www.atos.net/>

________________________________
De : ckan-dev-bounces at lists.okfn.org [ckan-dev-bounces at lists.okfn.org] de la part de David Read [david.read at hackneyworkshop.com]
Date d'envoi : mardi 17 juillet 2012 15:27
À : CKAN Development Discussions
Objet : Re: [ckan-dev] Spatial Extension : Datasets without spatial metadata

Oceane,

If a dataset doesn't have an extent defined then I would agree with the default of excluding it from all spatial searches. If nothing else, it encourages publishers to define a datasets' extent.

If you really wanted to include spatially-undefined datasets, then you'd have to change the Postgis query.

In data.gov.uk<http://data.gov.uk> we also have the opposite problem: many datasets have the extent set to the whole of the UK (because of laziness/default), even if the dataset applies to one city. So you search for London and datasets from Edinburgh are in the results, which is perhaps just as annoying as not getting any results.

An improvement would be to weight higher in the search results those datasets with a spatial area 'similar' to the search area. So a search for London datasets would rank London datasets higher than UK datasets. I wonder if @Adria knows a recognised way to calculate the 'similarity' of two spatial areas to achieve this?

David

On 17 July 2012 10:21, VENTURA Oceane <OCEANE.VENTURA at atos.net<mailto:OCEANE.VENTURA at atos.net>> wrote:
Hi,

I just installed the spatial extension and I noticed an unexpected behavior when I do a research.

With the spatial query widget activated, if the spatial extent is not defined, there is no result. If I specified a geographic area, CKAN find the package with spatial metadata.
But I never have the package without these metadata in the result.

Is it possible to do the research on package without spatial if the extent isn’t specified by the user?

TIA,

[X][X]
Océane VENTURA
Business Development & Innovation
ATOS - Public Sector France
01.73.26.47.92
06.32.33.25.99
oceane.ventura at atos.net<mailto:oceane.ventura at atos.net>
River Ouest,
80 quai Voltaire
95 877 Bezons Cedex
www.atos.net<http://www.atos.net/>

________________________________

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