On Thu, Apr 28, 2011 at 8:08 AM, James Umbanhowar <jumba...@gmail.com>wrote:
> On Thursday 28 April 2011 08:53:56 Ben Supnik wrote: > > Hi Ian, > > > > I should be able to convert the NHD data sometime in the next week or > > so. Also, if/when you want the original data, let me know. > > > > For the conversion, do we want medium or high resolution? > > > > Re: the import status map, I don't know how to make an actual map from > > them....short of simply providing a KML file and saying "go look on > > Google Earth", what formats are most useful for making an overlay status > > map? (I could do that conversion and hand it off to someone.) > > > > cheers > > ben > > > > I've been checking some of the imported data and my general feel is that it > is > overdigitized. I don't know if medium versus high reflects just the > quality or > the amount of digitization. That would be something to check. One could > also > just run some sort of simplification algorithm on all the data. > I haven't seen any excess digitization, but I have seen incorrect data (stream networks completely missing from aerial imagery and vice versa). I suppose we could do some light simplification on the more complicated waterbodies. > > Also, are the plans to make one file for each subbasin or one file per > attribute > (flowline, waterbody etc...). With one file, one can remove all the > duplicate > nodes before uploading. > In the past it was file per datatype because all of the tools work with one shapefile at a time. Theoretically we could post-process the OSM data to remove duplicate nodes between the data types. (and if we do that we might as well download the area from the API and do a check to see if the data already exists). > > Maybe it would be useful to do a test subbasin with whatever toolchain > you're > going to use and then post it so that mappers can check to see how the > conversion meshes with our general wants. > > There have been several tests already and data has already been imported. I'm happy to have people try out a subbasin as I'm running the conversion scripts (I imagine it will take a while) so we can restart the conversion if a bug is found.
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