Re: [OSM-talk] West African mangrove forests and PGS coastlines
On Wed, Jan 28, 2009 at 9:43 PM, Gustav Foseid gust...@gmail.com wrote: In West Africa, I have noticed that mangrove forests are often tagged as sea by PGS. Some examples are found at: Landsat also produces images outside of the visibile light spectrum, perhaps looking at these others could help? (How to access these, and if it really works I don't know). -- /emj ___ talk mailing list talk@openstreetmap.org http://lists.openstreetmap.org/listinfo/talk
Re: [OSM-talk] West African mangrove forests and PGS coastlines
On Thu, Jan 29, 2009 at 12:41 PM, Erik Johansson e...@kth.se wrote: Landsat also produces images outside of the visibile light spectrum, perhaps looking at these others could help? (How to access these, and if it really works I don't know). I downloaded Landsat images of Banjul from ftp://ftp.glcf.umiacs.umd.edu/glcf/Landsat/WRS2/p205/r051/p205r051_7x20001106.ETM-EarthSat-Orthorectified/and started playing around a bit. The result ended up looking like this: http://www.foseid.no/gustav/gallery/main.php?g2_itemId=1073g2_imageViewsIndex=1 Compare with how this looks in OpenStreetMap today and in OpenAerialMap (iCube Landsat): http://www.openstreetmap.org/?lat=13.394lon=-16.358zoom=11layers=B000FTF http://www.openaerialmap.org/?lat=13.42284lon=-16.56708zoom=11layers=BF I have not tested the same settings at other places, but it does at least indicate that automated tracing from selected Landsat data could be possible. - Gustav ___ talk mailing list talk@openstreetmap.org http://lists.openstreetmap.org/listinfo/talk
Re: [OSM-talk] West African mangrove forests and PGS coastlines
I noticed the same issue on South America's eastcoast and large river mounds too... I think there's no easy solution because the color of mangrove forests and the sea are too near to one another... Using josm's lakewalker to trace sea/island there' s a maximum gray value to count as water one can play with... Roman In West Africa, I have noticed that mangrove forests are often tagged as sea by PGS. Some examples are found at: Does anyoe have any idea on how to solve this without having to do manual tracing for large parts of the coastline and riverbanks? ___ talk mailing list talk@openstreetmap.org http://lists.openstreetmap.org/listinfo/talk
