The USGS National Hydrologic Database is a great resource for those of us
who need these data. The state files are huge (by comparison to most with
which I've worked): Oregon is 425M and Nevada is 330M. Unfortunately
(perhaps fortunately) they're not in ESRI or MS format, but Borland's
Interbase/Firebird format.
I know that GDAL works on raster data and ogr on vector data from ESRI
.shp and MapInfo. I assume the NHD files are vector. Will v.in.ogr work on
them and is there a linux-based tool to convert the attribute data?
Rich
Reading the info on http://nhd.usgs.gov/data.html, it looks like the NHD is available as ESRI personal geodatabase (mdb files, which is the native format of the NHD data model developed by USGS) as well as shapefiles (which includes basic geometry and attributes, no relationships, etc...)
OGR can read/write shapefiles and read-only ESRI personal personal geodatabase (MDB) files, http://www.gdal.org/ogr/ogr_formats.html.
- John
**************************************************
John Callahan, Geospatial Application Developer
Delaware Geological Survey, University of Delaware
Email: john.callahan@udel.edu
**************************************************
Rich Shepard wrote:
The USGS National Hydrologic Database is a great resource for those of us
who need these data. The state files are huge (by comparison to most with
which I've worked): Oregon is 425M and Nevada is 330M. Unfortunately
(perhaps fortunately) they're not in ESRI or MS format, but Borland's
Interbase/Firebird format.
I know that GDAL works on raster data and ogr on vector data from ESRI
.shp and MapInfo. I assume the NHD files are vector. Will v.in.ogr work on
them and is there a linux-based tool to convert the attribute data?
Rich
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On Mon, 23 Nov 2009, John Callahan wrote:
Reading the info on http://nhd.usgs.gov/data.html, it looks like the NHD is available as ESRI personal geodatabase (mdb files, which is the native format of the NHD data model developed by USGS) as well as shapefiles (which includes basic geometry and attributes, no relationships, etc...)
John,
I'm embarrassed to write that I did not look carefully enough at the Web
site. I saw that I could order the files I wanted, but neglected to check
format assuming they'd be .e00 like most federal agency data. Mea culpa!
OGR can read/write shapefiles and read-only ESRI personal personal geodatabase (MDB) files, http://www.gdal.org/ogr/ogr_formats.html.
I know. I've been using v.in.org for the vector data from the Oregon state
GIS repository.
Thank you ... I'll re-order the data. They put the data on one of their
ftp servers. Oregon data (zipped not tarred and gzipped) is 425M; unzipped
it's 1.1G.
Much appreciated,
Rich