OpenSeaMap-dev:Downloadable Raster Charts: Unterschied zwischen den Versionen

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(formats: update on mbtiles)
(prefabricated charts: kap.grade.de added)
 
Zeile 16: Zeile 16:
 
* [http://sourceforge.net/projects/opennautical/ OpenNauticalCharts] (outdated)
 
* [http://sourceforge.net/projects/opennautical/ OpenNauticalCharts] (outdated)
 
* [[OpenSeaMap-dev:De:Chart-Bundler|Chart-Bundler]] (work in progress)
 
* [[OpenSeaMap-dev:De:Chart-Bundler|Chart-Bundler]] (work in progress)
 +
* [http://kap.grade.de/ kap.grade.de] (showcase)
  
 
=== on demand ===
 
=== on demand ===

Aktuelle Version vom 27. Februar 2015, 18:04 Uhr

Discussion

Status Quo

prefabricated charts

  • pros:
    • low stress on tile servers
  • cons:
    • set up needed
    • needs to be maintained
    • not always up to date
    • might not fit users needs

Links:

on demand

  • pros:
    • up to date
    • fits individual needs
  • cons:
    • high stress on tile servers
    • users have to do some research, might be a complex task

Links:

Ideas

cache & proxy tile server

  • TileStache provides
    • numerous caches (eg. disk, Memcache, Amazon S3, MBTiles)
    • TMS and WMS proxy
    • fast and faster using nginx
    • cache max-age: 30 days?

formats

  • served by cache & proxy tile server at minimum cost
    • tiles in TMS z/x/y directory structure (eg. gps-32, openlayers)
    • tiles in TMS z/x/y structure encapsulated in sqlite file ( mbtiles, eg. tilestache, OruxMaps, Locus)
    • single raster file stiched together via script and imagemagic (eg. .kap/openCPN)
    • gemf format - compact format for tiles, can be read by various libraries - e.g. osmdroid, simple to handle gemf format

bounding boxes/ tile sets

  • coastal / ocean / open waters
  • inland waterways
  • lakes
    • ...

web frontend

  • map showing boundingboxes according zoom level transas sample
  • sortable table
  • search by name/number/area/purpose
  • functions:
    • search prefabricated files, check age
    • trigger generating script in case file does not exist/ is obsolete