Philippines/Geodata detail levels

From OpenStreetMap Wiki
Jump to navigation Jump to search
 
 
WikiProject Philippines banner.png
This page aims to document the levels of detail that can be targeted for OSM geodata in the Philippines. While the long-term goal is to have everything of interest mapped and kept up-to-date, there are intermediate levels of detail that can be attained and which makes the data immediately useful for particular purposes.

Levels

Level Parameters Data requirements
1
Philippine map
Scale / zoom 1:5,000,000-1:500,000 / 7-10
Spatial accuracy 2,500-250 m
Completion unit Philippines (monitor per province)
Use cases
  • Philippine overview maps
Sample products

Natural features:

  • Complete coastline and place nodes of the largest islands (larger than 50 ha, maybe around 1000 islands)
  • Paths and outlines of major rivers and lakes
  • Labels of major straits, bays and gulfs (no tag yet)
  • Nodes locating peaks of important mountains and volcanoes with ele=*
  • Labels of mountain ranges (no tag yet)
  • Labels of peninsulas (no tag yet)

Administrative features:

  • Provincial and regional boundaries
  • Nodes for centers of all cities and municipalities

Transport network:

  • All highway=motorway, trunk, primary roads
  • All railroads
  • Complete Ro-ro routes and notable ferry routes
  • Nodes for all airports
2
Provincial map
Scale / zoom 1:500,000-1:50,000 / 11-13
Spatial accuracy 250-25 m
Completion unit Region/Province (monitor per city/municipality)
Use cases
  • Provincial overview maps
  • Regional tourist maps
Sample products

The following are in addition to Level 1 coverage. (Take note of the increased spatial accuracy needed.)

Administrative features:

  • City and municipality boundaries
  • Nodes for all barangays

Transport network:

  • All highway=secondary, tertiary roads
  • All established ferry routes
3
City map
Scale / zoom 1:50,000-1:5,000 / 14-16
Spatial accuracy 25-2.5 m
Completion unit City/municipality (monitor per barangay or other sub-city/municipal unit)
Use cases
  • City/municipal maps
  • City-level tourist maps
  • City-level street atlases
Sample products


4
Sat nav
Scale / zoom 1:25,000-1:2,500 / 15-18
Spatial accuracy 13-2 m
Completion unit City/municipality (monitor per barangay or other sub-city/municipal unit)
Use cases
  • GPS sat nav systems for motorized vehicles
Sample products


5
Area map
Scale / zoom 1:10,000-1:1,000 / 16-19
Spatial accuracy 5-1 m
Completion unit Any specific area
Use cases
  • Building maps of business districts
  • Campus maps
  • Industrial park maps
Sample products


6
Geocoder
Scale / zoom 1:10,000-1:1,000 / 16-19
Spatial accuracy 5-1 m
Completion unit City/municipality (monitor per barangay or other sub-city/municipal unit)
Use cases
  • Geocoding
  • Reverse geocoding
Sample products

unknown


7
Pedestrian nav
Scale / zoom 1:5,000-1:500 / 17-20
Spatial accuracy 3-0.5 m
Completion unit Barangay/area/district
Use cases
  • Pedestrian-level navigation
  • Maybe: navigation for the blind
Sample products

unknown

Meaning of parameters

  • Scale / zoom. This is the target map scale for each level with a corresponding zoom level on standard OSM Slippy Maps (assuming a 96dpi screen). The scale and zoom dictates the amount of detail and spatial accuracy needed.
  • Spatial accuracy. This specifies how accurate the features must be positioned. This required accuracy level is estimated such that the allowable error is less than the resolution of 50dpi when a map at that corresponding level's scale is printed.
  • Completion unit. This states the suggested geographic area that should be used to target completion for a corresponding level. For example, for Level 2, a good target is to have the province of Bulacan reach this level.
  • Use cases. Possible uses, products, or services that can be produced when we have complete data for a completion unit at the corresponding level.
  • Sample products. This gives examples of existing non-OSM products and services that fit the corresponding level.