Sean M. Quigley
2003
Ohio-drainage digital elevation model for use with Water Resources Investigations Report 03-4164
raster digital data
Water-Resources Investigations Report
USGS WRIR 03-4164
Columbus, Ohio
U.S. Geological Survey
http://water.usgs.gov/lookup/getspatial?elevgrd
This coverage was derived from U.S. Geological Survey National
Elevation Dataset (NED) Digital Elevation Models (DEMs) for all of Ohio and portions of Indiana,
Michigan, Kentucky, West Virginia, Pennsylvania, and New York. The dataset is a raster grid
coverage representing a 30 meter grid cell size, or 1-arc second, and is in units of decimeters.
The various NED source datasets used to create this dataset came primarily from state agencies who
provide such data free of any fees or charges. More information about NED data can be found at
http://gisdata.usgs.net/NED/default.asp.
This coverage was created to derive elevation and hydrography related characteristics
of selected drainage basins within Ohio and portions of surrounding states for use in regression
equations present by Koltun (2003). These characteristics include mean basin elevation, elevation at
basin centroid, and main-channel slope. Other hydrography related uses of DEMs include the analysis
of aspect, hill shade, flow accumulation, and flow direction. DEMs of 30 meter resolution are intended
to be used at scales of 1:24,000 and smaller.
Koltun, G.F., 2003, Techniques for Estimating Flood-Peak Discharges of
Rural, Unregulated Streams in Ohio: U.S. Geological Survey Water-Resources
Investigations Report 03-4164
The U.S. Geological Survey, EROS Data Center developed the NED as a seamless
mosaic of best-available elevation data for the conterminous United States.
19990201
ground condition
As needed
-85.45679588
-79.44465158
42.30412158
37.73128706
NONE
Elevation
Topography
Slope
Percent Rise
Z-value
National Elevation Dataset
Digital Elevation Model
Topography
inlandWaters
NONE
Ohio
Indiana
Kentucky
West Virginia
Pennsylvania
New York
Michigan
NONE
This coverage is intended for use with regression equations given in
Koltun (2003). Suitability for other uses has not been determined.
Sean M. Quigley
United States Geological Survey, WRD
Computer Information Specialist
physical address
6480 Doubletree Avenue
Columbus
OH
43229
USA
1-888-275-8747
(614) 430-7700
squigley@usgs.gov
Windows NT Version 5.0 (Build 2195) Service Pack 3; ESRI ArcInfo 8.1.0.415
A plan for assessing the overall accuracy of the National Elevation Dataset (NED) based on independent
high-accuracy geodetic control is currently under development. Until an independent overall assessment
of the accuracy of NED is completed, it is best to refer to published information on the accuracy of the source digital elevation models (DEM's) from which NED was assembled. The primary source data were the
USGS 7.5-minute (30-meter or 10-meter resolution) DEM's. Gaps in the 7.5-minute DEM coverage were filled
with data from USGS 30-minute (2-arc-second resolution) or 1-degree (3-arc-second resolution) DEM's.
Not Required for Raster Data
Elevation (Z) values were originally in meters and later converted to decimeters to eliminate float definition, but retain detail.
Efforts to determine this are currently under way (see attribute accuracy report).
Efforts to determine this are currently under way (see attribute accuracy report).
U.S. Geological Survey (USGS), EROS Data Center
19990201
National Elevation Dataset
1
map
http://erg.usgs.gov/isb/pubs/factsheets/fs14899.html
24000
CD-ROM
19990201
ground condition
USGS-EDC
USGS, EROS DATA CENTER
Converted Z-Values of NED DEM grids of eastern and western Ohio from meters to decimeters in ARC/GRID 8.0.2. Resulting grids were then mosaic'd to create a single elevation grid for Ohio in decimeters.
20020201
Sean M. Quigley
United States Geological Survey
Computer Information Specialist
physical address
6480 Doubletree Avenue
Columbus
OH
43229
USA
1-888-275-8747
(614) 430-7700
squigley@usgs.gov
NED DEM grid for Michigan was projected from
projection oblique_mercator
(GRS 80 spheroid)
units meters
datum nad83
parameters
2 (Projection Type)
.9996 (Scale factor)
-86 00 00 (Longitude of projection center -- in decimal degrees = -86.0000 )
45 18 33 (Latitude of projection center -- in decimal degrees = 45.3092 )
337.255555555556 (Azmuth at projection center)
2546731.496 (False easting)
-4354009.816 (False northing)
TO
Projection: UTM
Units: Meters
Zone: 17
Datum: NAD 83
Parameters:
Source grid was already in decimeters
20020201
Sean M. Quigley
United States Geological Survey
Computer Information Specialist
physical address
6480 Doubletree Avenue
Columbus
OH
43229
USA
1-888-275-8747
(614) 430-7700
squigley@usgs.gov
NED DEMs for 26 counties of Pennsylvania were downloaded from http://www.pasda.psu.edu/access/ned.shtml. All 26 DEMs were converted to ARC/INFO grids using the DEMGRID command in ARC/GRID 8.0.2. Resulting grids were mosaic'd into a single grid and projected from:
Projection: Albers Conical Equal Area
Standard Parallel:40
Standard Parallel:42
Longitude of Central Meridian:-78
Latitude of Projection Origin:39
False Easting:0
False Northing:0
TO
Projection: UTM
Units: Meters
Zone: 17
Datum: NAD 83
Parameters
Resulting grid Z-Values were then converted from meters to decimeters.
20020213
Sean M. Quigley
United States Geological Survey
Computer Information Specialist
physical address
6480 Doubletree Avenue
Columbus
OH
43229
USA
1-888-275-8747
(614) 430-7700
squigley@usgs.gov
NED DEM grid of Indiana was projected from:
Projection: Albers
Units: Meters
Datum: NAD83
1st Standard Parallel: 29 30 0.000
2nd Standard Parallel: 45 30 0.000
TO
Projection: UTM
Units: Meters
Zone: 17
Datum: NAD83
Parameters:
Grid was already in Decimeters
20020219
Sean M. Quigley
United States Geological Survey
Computer Information Specialist
physical address
6480 Doubletree Avenue
Columbus
OH
43229
USA
1-888-275-8747
(614) 430-7700
squigley@usgs.gov
Resulting decimeter grids for Indiana, Ohio, Michigan, Pennsylvania were mosaic'd into a single grid.
Resulting grid was clipped against a polygon coverage in ARC/GRID 8.0.2 representing the study area.
20020219
Sean M. Quigley
United States Geological Survey
Computer Information Specialist
physical address
6480 Doubletree Avenue
Columbus
OH
43229
USA
1-888-275-8747
(614) 430-7700
squigley@usgs.gov
West Virginia NED DEM was downloaded from http://129.71.240.42/data/ned.html. Projection was already in UTM, Meters, Zone 17, Datum NAD 83. Grid Z-Values were converted from meters to decimeters.
20020624
Sean M. Quigley
United States Geological Survey
Computer Information Specialist
physical address
6480 Doubletree Avenue
Columbus
OH
43229
USA
1-888-275-8747
(614) 430-7700
squigley@usgs.gov
Kentucky NED DEMs were downloaded from http://kymartian.state.ky.us/dems/. These DEMs had to be downloaded by 7.5 minute quadrangle. There were 85 quad based DEMs required for the study area. These DEMs were mosaic'd in ARC/GRID 8.0.2 into a single grid. This resulting grid was then projected from:
Projection: STATEPLANE
Units: FEET
Zone: 3926
Datum: NAD83
Parameters:
TO
Projection: UTM
Units: Meters
Zone: 17
Datum: NAD83
Parameters:
Z-Values for resulting grid were then converted to decimeters.
20020910
Sean M. Quigley
United States Geological Survey
Computer Information Specialist
physical address
6480 Doubletree Avenue
Columbus
OH
43229
USA
1-888-275-8747
(614) 430-7700
squigley@usgs.gov
A small section of southeastern New York NED DEM was obtained from http://gisdata.usgs.net/NED/default.asp.
DEM was converted to a grid using the DEMGRID command in ARC/GRID 8.0.2. Resulting grid was then projected from:
Projection: GEOGRAPHIC
Units: DD
Datum: NAD83
Parameters:
TO
Projection: UTM
Units: Meters
Zone: 17
Datum: NAD83
Parameters:
Z-Values were then converted to decimeters.
20021029
Sean M. Quigley
United States Geological Survey
Computer Information Specialist
physical address
6480 Doubletree Avenue
Columbus
OH
43229
USA
1-888-275-8747
(614) 430-7700
squigley@usgs.gov
Study area was extended to capture addition of West Virginia, Kentucky, and New York DEMs. All DEMs were mosaic'd into a single grid in ARC/GRID 8.02, and clipped against an updated polygon coverage representing the study area.
20020910
Sean M. Quigley
United States Geological Survey
Computer Information Specialist
physical address
6480 Doubletree Avenue
Columbus
OH
43229
USA
1-888-275-8747
(614) 430-7700
squigley@usgs.gov
Raster
Grid Cell
16372
16225
1
Transverse Mercator
0.999600
-81.000000
0.0
500000.000000
0.000000
row and column
30.570949
30.570949
meters
North American Datum of 1983
Geodetic Reference System 80
6378206.4
294.98
North American Vertical Datum of 1988
1 decimeter
decimeters
Attribute values
elevgrd.vat
Value Attribute Table
ESRI ARC/INFO 8.0.2
Order_ID
ARC/INFO Item
NONE
1
4549
19990201
Value
Grid cell elevation values in decimeters
NONE
1301
11100
decimeters
1 decimeter
Count
The number of cells for each elevation value
NONE
1
5166757
unitless
1
Elevation in decimeters above sea level
NONE
U.S. Geological Survey
Ask USGS - Water Webserver Team
mailing
445 National Center
Reston
VA
20192
1-888-275-8747 (1-888-ASK-USGS)
http://answers.usgs.gov/cgi-bin/gsanswers?pemail=h2oteam&subject=GIS+Dataset+elevgrd
Although this data set has been used by the U.S. Geological
Survey, U.S. Department of the Interior, no warranty expressed or
implied is made by the U.S. Geological Survey as to the accuracy
of the data and related materials. The act of distribution shall not
constitute any such warranty, and no responsibility is assumed by
the U.S. Geological Survey in the use of this data, software, or
related materials.
Any use of trade, product, or firm names is for descriptive
purposes only and does not imply endorsement by the U.S.
Government.
Export
Full coverage
zipped
1
http://water.usgs.gov/GIS/dsdl/elevgrd.e00.gz
Other
ascii grid format
zipped
1
http://water.usgs.gov/GIS/dsdl/elevgrd.ascii.tar.gz
None. This dataset is provided by USGS as a public service.
20041108
U.S. Geological Survey
Ask USGS -- Water Webserver Team
mailing
445 National Center
Reston
VA
20192
1-888-275-8747 (1-888-ASK-USGS)
http://water.usgs.gov/user_feedback_form.html
FGDC Content Standards for Digital Geospatial Metadata
FGDC-STD-001-1998