[ckan-dev] Spatial search returning too many results

Wed Jun 14 11:30:34 UTC 2017

Hi Adrià,

Thank you so much for the response and confirming that this is the default behaviour.

Cheers,

Mark Winterbottom

Full-Stack Software Engineer

Skype: mark.winterbottom

________________________________
From: ckan-dev <ckan-dev-bounces at lists.okfn.org> on behalf of Adrià Mercader <adria.mercader at okfn.org>
Sent: 13 June 2017 16:33:31
To: CKAN Development Discussions
Subject: Re: [ckan-dev] Spatial search returning too many results

Hi Mark,

The behaviour that you describe (returning datasets with extents that intersect with the query extent) is the default one. You can check it on the demo site as well (note that not the whole of Afghanistan is used as the query extent and yet the dataset is returned):

http://demo.ckan.org/dataset?q=&sort=score+desc%2C+metadata_modified+desc&ext_bbox=57.30468749999999%2C32.99023555965106%2C63.984375%2C37.43997405227057&ext_prev_extent=55.810546875%2C31.541089879585808%2C65.478515625%2C38.71980474264237

The algorithm used will sort the datasets based on the closeness of the query extent to the dataset one.

The code for the `solr` backend is in [1] and for the `solr-spatial-field` one in [2]. If you want, you can customize the queries sent to Solr to use "contain" rather than "intersect". To do so implement the IPackageController from your plugin and add the `before_search` method to tweak the query parameters sent to solr as the spatial extension does.

Hope this helps,

Adrià

[1] https://github.com/ckan/ckanext-spatial/blob/master/ckanext/spatial/plugin.py#L256
[2] https://github.com/ckan/ckanext-spatial/blob/master/ckanext/spatial/plugin.py#L258

On 13 June 2017 at 15:57, Mark Winterbottom <Mark.Winterbottom at jisc.ac.uk<mailto:Mark.Winterbottom at jisc.ac.uk>> wrote:

Hello,

I'm not sure if this is a bug or if I have done something wrong in the configuration.

I have a CKAN 2.6.2 instance with the latest version of ckanext-spatial (installed from the master branch). I am using the solr backend and have added the solr fields to the schema as suggested here: http://docs.ckan.org/projects/ckanext-spatial/en/latest/spatial-search.html. I am also using Solr 6.0.

Here is a URL to the instance:
http://rdds.researchdata.alpha.jisc.ac.uk

My problem is that when using the map search, it returns all datasets where the coordinates overlap the searched area.

I would expect it to return only the datasets with the entire bounding box of the dataset falls within the selected area on the map, just like it does on the demo site (http://demo.ckan.org/).

Is this the desired behaviour or is something wrong with my instance? Are there any details available as to the configuration and plugin versions installed on the demo site that I can look it to compare with my own setup?

Thanks in advance,
Mark

Mark Winterbottom

Full-Stack Software Engineer

Skype: mark.winterbottom

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