Re: [talk-ph] Automated assessment of OSM coastline data quality

2013-04-15 Thread Eugene Alvin Villar
Well Landsat's resolution is low so any coastline traced using Landsat (like almost all of the coastline corrections 3 years ago) will have a low average distance between nodes marking it as low to average quality. So while the offset may be a problem, I think the low node density can be already us

Re: [talk-ph] Automated assessment of OSM coastline data quality

2013-04-14 Thread maning sambale
Interesting. Thanks for sharing Eugene. I think the common issue for the Philippines is the third case in the first image ("coastline with detailed but inaccurate approximation"). When we started the coastline correction 3 years ago, there was very little hi-res imagery. For my part, I did most

[talk-ph] Automated assessment of OSM coastline data quality

2013-04-13 Thread Eugene Alvin Villar
Hi guys, Here's a nice analysis done by Christoph Hormann in automated assessment of the quality of OSM's coastline data: http://www.imagico.de/map/coastline_quality_en.php If you don't want to read the whole article, here's the TL;DR version: Coastlines where there are a few nodes per kilometer