I’ve added spatial filtering to the sunburnt library. The feature is now available with filter_spatial function. Example usage
from sunburnt import SolrInterface
SOLR_URL = 'http://some.url:8983/solr/'
_s = SolrInterface(SOLR_URL)
_s.filter_spatial(latlon=(52.3702157, 4.8951679), distance=10)
Currently this will use bbox by default....