Re: [Talk-us] hydrology Alaska

2017-10-18 Thread Christoph Hormann
On Wednesday 18 October 2017, Andy Townsend wrote: > > https://www.openstreetmap.org/#map=17/69.94271/-152.49898 > > isn't the result of simplification, though, is it?  You can see the > pixels... Like others here i have no practical experience with scanaerial but it seems the vectorization

Re: [Talk-us] hydrology Alaska

2017-10-18 Thread Andy Townsend
On 18/10/2017 05:49, ANT Berezhnyi wrote: +10 to what AlaskaDave said Simplification creates such a crap, as you led me to an example https://www.openstreetmap.org/#map=17/69.94271/-152.49898 isn't the result of simplification, though, is it?  You can see the pixels... I'd suggest that,

Re: [Talk-us] hydrology Alaska

2017-10-17 Thread ANT Berezhnyi
+10 to what AlaskaDave said I myself want to be beautiful and accurate, I make with accuracy 1 point on 1..2 meters, on the exact perimeter of the lake (accuracy 30 ... 50 centimeters from the coastline) then I am simplifying (because it requires https://www.openstreetmap.org/user/bdistsoe

Re: [Talk-us] hydrology Alaska

2017-10-17 Thread Ben Discoe
+1 to what AlaskaDave said. As far as I can tell in this case, the jaggies are a result of running ScanAerial on imagery of a low resolution (i.e. zoomed out). At that level (LandSat resolution), a smooth lake edge looks like a jagged set of individual pixels, where each pixel is 28 meters

Re: [Talk-us] hydrology Alaska

2017-10-17 Thread Dave Swarthout
The tracing for that pond ( https://www.openstreetmap.org/way/532622119) is horrible IMO. This is the sort of geometry that drives me crazy when I look at Alaskan coastlines. The long zig-zag at the top edge could be better done with a few points and the adjoining ponds at the SE are very rough

Re: [Talk-us] hydrology Alaska

2017-10-17 Thread Christoph Hormann
On Tuesday 17 October 2017, ANT Berezhnyi wrote: > > so on the question ... > > Is it possible to vectorize the USGS on the OSM if there is no > Landsat, and everything else in the clouds, or in the snow, or the > quality is bad ... There are no parts of the US where there is no better imagery

[Talk-us] hydrology Alaska

2017-10-17 Thread ANT Berezhnyi
(sorry for my english) question: On 2017-10-16 02:33:13 UTC velmyshanovnyi http://www.hdyc.neis-one.org/?velmyshanovnyi wrote: === so on the question ... Is it possible to vectorize the USGS on the OSM if there is no Landsat, and