WOCAT » QCAT

Da haben wir noch eine Zeitschätzung versprochen...

Summary of tasks¶

Extend data model¶

There is already a DB field for geometry (questionnaire_questionnaire.geom, used to store point data). Probably it makes sense to use a different DB field (e.g. questionnaire_questionnaire.poly_geom) to store polygons? (Bonus: If only polygons were submitted and no point data, then calculate centroid point out of polygon?)

Estimation: 2h

Configuration¶

Currently, the configuration (e.g. technologies.json) knows which question is used for point data by having attribute "is_geometry": true. This needs to be updated (extended by "has_polygons": true?). Will all questionnaire have polygons? (see open questions). Write helper functions to access this question and its data

Estimation: 8h

Store data¶

Correctly store new/updated polygons after form submission (as GeometryCollection, similar to points)

Estimation: 4h

Map in details (1)¶

Map (static) in questionnaire details: A static preview image is created to show the location relative to the country. It probably does not make sense to show polygons there as they are too small.

Estimation: -

Map in details (2)¶

• pass geometry data of questionnaire to view
• extend existing map toolbar to toggle display of polygons (visible by default?)
• adapt "zoom to all points on the map" to zoom to entire extent of map data (points and polygons)
• show count of polygons

Estimation: 8h

Map in form¶

• allow drawing and editing of polygons (add new layer)
• extend existing map toolbar to toggle draw/edit-mode
• button to delete all polygons

Estimation: 16h

API¶

No geometries (neither point nor polygon) visible in list. In details, include polygon (as geojson)

Estimation: 6h

Tests¶

Estimation: 8h

Tech considerations¶

• Caution: OpenLayers v3.16.0 is used (current version: v4.6.4). Probably hard to find documentation, examples and scripts to facilitate drawing of polygons. Upgrading OpenLayers or even switch other mapping library (e.g. LeafletJS) would be highly recommended, also for long-term sustainability of the application, but is expensive as existing code (e.g. functionality to add points) needs to be rewritten. (rough estimation: + 30-40h)

Open questions¶

• Draw polygons for all types of questionnaires (technologies, approaches, cca, ...)?