Simplification of the data model

Created by: hixi

needs better specification

This is the the main story for the 2.0 release

Possibilities:

• leave out an entire table
• leave out an attribute
• aggregate attributes (eg. Shops)
• filter features by attributes
• aggregate geometries
• simplify geometries (generalize, eg streets, administrative areas, ...)
• "Object" conversion (aggragation, eg. Trees -> Forest)

The exported data should be available with simplified data, i.e. leaving out some tables. The corresponding styles for the QGis need adaptations as well, i.e. the left out tables need to be removed from the style. It is a difference between an empty table and non-extisting data, AFAIK QGis will not be able to load the data in the latter case.

In the simplification, city limits instead of houses and similar should be happening as well.

Depends on #334 (closed)

Ideas

• Create an so-called pro-mode: let user choose in various details what to leave out/take in

Todos

• enable use of different output trim levels
• implement first (and only?) trim level
  • leave out table, only include
    • adminarea_a, boundary_l, geoname_l, geoname_p, landuse_a, military_a, military_p, misc_l, natural_a, natural_p, poi_p, pow_p, railway_l, road_l, route_l, utility_p, water_a, water_p, water_l, transport_l, coastline_l, landmass_a, ocean_a
  • use different sql statements for reduced data
    • simplify road_l output data: include only:
      • track, grade1, hihgway='track' tracktype='grade1'
      • junction, grade2, hihgway='track' tracktype='grade2'
      • roundabout, motorway, hihgway='motorway' junction='roundabout'
      • roundabout, motorway_link, hihgway='motorway_link' junction='roundabout'
      • roundabout, primary, hihgway='primary' junction='roundabout'
      • roundabout, primary_link, hihgway='primary_link' junction='roundabout'
      • unclassified, road, hihgway='{}' roundabout=*
      • roundabout, roundabout, hihgway=* junction='roundabout'
      • roundabout, secondary, hihgway='secondary' junction='roundabout'
      • roundabout, secondary_link, hihgway='secondary_link' junction='roundabout'
      • roundabout, tertiary, hihgway='tertiary' junction='roundabout'
      • roundabout, trunk, hihgway='trunk' junction='roundabout'
      • roundabout, trunk_link, hihgway='trunk_link' junction='roundabout'
      • roundabout, unclassified, hihgway='unclassified' junction='roundabout'
      • aggtpyes: others, highway_links, major_road, minor_road, no_large_vehicule, roundabout, small_road, track