Coastline update


The generalized coastline data sets have been updated and i also wrote an update to my Openstreetmap coastline quality report. This contains a new visualization of the coastline node age showing were the coastline has been modified most recently:

Overall it seems the last half year there have not been many imports of coastline data but manual mapping activity was quite extensive. This might be related to the fact that the coastline of the map on is now updated daily so changes show up faster.

Not much has changed about the worst parts of the Openstreetmap coastline though which leads me to the (surely incomplete) list of most serious errors a.k.a. the best chances for membership in the zoom level zero club:

  1. The Rann of Kutch at the India/Pakistan border, see here which should not be coastline since it is only seasonally flooded (more than 50km error)
  2. Northwest Ellesmere Island (more than 20km error)
  3. Eastern Greenland ice coast (about 20km error, glacier and coastline are not consistent in OSM here, Bing and many other satellite mosaics are not correct either)
  4. Southern Chile coast (more than 20km error originally due to cloud gaps in PGS data)
  5. Northeast Caspian Sea islands (>10km but somewhat unclear due to sea level changes)
  6. Kirov Islands, Kara Sea in northern Russia (~10km)
  7. Various parts of eastern Sulawesi (~7km)
  8. Miller Island near Ellesmere Island in northern Canada (~6km)
  9. Southeast coast of Nordaustlandet, Svalbard (more than 5km due to glacier changes)
  10. Seluan Island in Indonesia (~5km)

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