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] Low-quality NHD imports

2017-10-17 Thread Ben Discoe
I've probably done the most NHD cleanup so far (at least some degree of fixing on the entire state of NC, most of IL, northern MI, parts of OK/TX/UT/CO, and a lot of CA), many hundreds of hours of manual work. Just to chime in with agreement on what everyone has said, yes to: 1. NHD has lots of

Re: [Talk-us] Low-quality NHD imports

2017-10-17 Thread Michael Patrick
> Maybe we can get someone to host NHD data for others to trace in. If anyone is reading this and is willing to host the data, I'm willing to help with the design and conversions. The USGS provides several WMS endpoints for the NHD , most likely these will

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