Geo distance scoring plugin for csv-reconcile
Project description
CSV Reconcile Geo distance scoring plugin
A scoring plugin for csv-reconcile using geodesic distance. See csv-reconcile for details.
Reconciliation
This plugin is used to reconcile values representing points on the
globe. It expects those values to be in well-known
text
format for a point. That is, like so: POINT( longitude latitude )
.
The pre-processor automatically strips off literal datatypes when present as well as double quotes.
The CSV column to be reconciled needs to be in the same format. In addition, there must be at most one instance of any id column. For instance, if reconciling against coordinate location for a wikidata item, there must be at most one location per item.
Scoring
The scoring used is more or less arbitrary but has the following properties:
- The highest score is 100 and occurs when the distance to the reconciliation candidate is zero
- The lower the score the greater the distance to the reconciliation candidate
- The score is scaled so that a distance of 10km yields a score of 50
Configuration
The plugin can be controlled via SCOREOPTIONS
in the csv-reconcile
--config
file. SCOREOPTIONS
is a Python
dictionary
and thus has the following form SCOREOPTIONS={ "key1":"value1,"key2":"value2"}
.
SCALE
set distance in kilometers at which a score of 50 occurs. ( Default 10km ) e.g."SCALE":2
COORDRANGE
If supplied do a precheck that both the latitude and the longitude of the compared values are within range. This is for performance to avoid the more expensive distance calculation for points farther apart. e.g."COORDRANGE":"1"
Future enhancements
Some of the current implementation was driven by the current design of csv-reconcile. Both may be updated to accommodate the following:
- Allow for separate latitude and longitude column in the CSV file
- Add some scoring options such as the following:
- Allow for overriding the scaling function
- etc.
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