Hi Y'all,
The USGS was kind enough to send me the latest shapefile extract for the
NHD yesterday. So my question is: is there some way I can process and
repost this data that would make it more suitable for importers?
I read the wiki pages on NHD imports a few weeks ago, but found the USGS
download process to be difficult - there wasn't a simple "click here and
get the shapefile you need to feed into shp2osm" type interface.
I could rehost the NHD files on my company's servers for a while,
perhaps even in .osm format.
But...the data extract is 'the whole database' split only by layer and
file size. For example, the water body layer (which contains area lakes
and ponds) comes as 5 shapefiles of between 500 and 800 MB each; there
isn't any spatial partitioning, so you would need to load the entire
data set to pull out lakes of interest for a given bounding box.
I could break the data up in a few ways...
- It looks like the reach codes contain sub basin IDs as their first 8
digits.
- I could break the data into square tiles.
- I suppose it could be split by state.
For the second two cases, the data is not naturally split along those
boundaries, so I'd have to either induce a cut (not preferable) or have
a few features be not quite where they'd be expected.
Anyway, I'm open to ideas...my end goal is to do enough of the GIS
processing type work that mappers who are enthusiastic and want to
improve their local water areas (but aren't comfortable with command
line tools and shapefiles) can grab a pre-converted chunk of data,
inspect it, and import some of it.
(Side note: I tried to do a test of a importing a multipolygon as a
vector background in Potlatch 2, and it failed for both .osm and .shp
format data, https://trac.openstreetmap.org/ticket/3701 - has anyone
successfully imported water data this way, or should I expect that users
will have to use JOSM?)
cheers
Ben
PS If anyone wants the raw data, let me know...I have enough broadband
that I could push it to a handful of users if interested.
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