| National
Elevation Data Set (NED) |
The National Elevation Dataset is a new
elevation product assembled by the U.S. Geological Survey (USGS). It was designed to provide national elevation data in a seamless form with a consistent datum, elevation unit, and projection. Data corrections were made in the assembly process to minimize artifacts, permit edge matching, and fill sliver areas of missing data.
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Standard DEM
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NED (National
Elevation Dataset)
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Specifications
- Coverage: Entire United States
- Source Data: USGS DEM data
(enhanced)
- Projection: Geographic, NAD 83,GRS
80, decimal degrees
- Resolution: one arc-second
(approximately 30 meters) for the conterminous United States, Hawaii,
and Puerto Rico and a resolution of two arc-seconds for Alaska.
- Each
file is delivered in a 1x1 degree block. DDS can provide each
file as individual quads- Call for special
requests.
- Media: CD, FTP, Hard-drive
Available Formats
- USGS Standard DEM file format
- ESRI GRID
- .BIL (Intel or Motorola byte order)
- Client specified format (custom pricing).
Call for special requests.
USGS
NED Fact Sheet (125 Kb)
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| Entire
USA NEDs at 30 Meter Resolution |
DDS, Inc. offers the
National Elevation Dataset (Enhanced DEM data) for
the entire USA, including Alaska, Hawaii, and Puerto
Rico in 1x1
degree tiles (approx.4,000 files) for only
$500! The
data is sampled at 1 arc second/30 meter resolution (60
meter resolution for Alaska). The following formats are
available from DDS:
Order
entire
USA NED Elevation Dataset at 30 Meters starting at $500

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| Download
30 Meter Samples: |
| 30
meter- ESRI ArcGRID |
30
meter- .DEM Format |
30
meter- .BIL (INTEL) |
| Don't see
a format that you need for your software
application? E-mail us at info@usgsquads.com
with your file format request |
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6 x 2 Degree Areas |
DDS, Inc. offers the
National Elevation Dataset (Enhanced DEM data) for
the 48 conterminous
States in 6x2 degree areas delivered in 1x1
degree tiles (approx. 12 files per area). The
data is sampled at one arc-second/30 meter
resolution. For Alaska,
the coverage is 7x6 degree, with a resolution of 60
meters. The following formats are
available from DDS:
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| Coverage
Index: |
Lower 48 States |
Alaska |
Hawaii and
Puerto Rico |
| Ordering
6x2 Degree Areas for $50 To order
6x2 degree areas for $50, simply locate the area number
using either the USA,
Alaska, or Hawaii/Puerto
Rico Coverage Index and click on 
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| Entire
USA NEDs at 90 Meter Resolution |
DDS, Inc. offers the
National Elevation Dataset (Enhanced DEM data) for
the entire USA, including Alaska, Hawaii, and Puerto
Rico in 1x1
degree tiles (approx.4,000 files) for only $150! The
data is sampled at 3 arc second/90 meter
resolution. This dataset is ideal
for compiling large areas (individual States or
multiple States) of Digital Elevation Models for
base maps or elevation analysis. The following formats are
available from DDS:
|
| Download
90 Meter Samples: |
| 90
meter- ESRI ArcGRID |
90
meter- .DEM Format |
90
meter- .BIL (INTEL) |
| Don't see
a format that you need for your software
application? E-mail us at info@usgsquads.com
with your file format request |
Order
entire
USA NED Elevation Dataset at 90 Meters for $150
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| Entire
USA NEDs at 300 Meter Resolution |
DDS, Inc. offers the
National Elevation Dataset (Enhanced DEM data) for
the entire USA, including Alaska, Hawaii, and Puerto
Rico in 1x1
degree tiles (approx.4,000 files) for only $50!
The
data is sampled at 10 arc second/300 meter
resolution. This dataset is ideal
for compiling very large areas (multiple States, or
the entire USA) of Digital Elevation Models for base
maps or elevation analysis. The following formats are
available from DDS:
|
| Download
300 Meter Samples: |
| 300
meter- ESRI ArcGRID |
300
meter- .DEM Format |
300
meter- .BIL (INTEL) |
| Don't see
a format that you need for your software
application? E-mail us at info@usgsquads.com
with your file format request |
Order
entire
USA NED Elevation Dataset at 300 Meters for $50
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| Digital Elevation
Models (DEM) |
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Digital elevation model (DEM) data are arrays of regularly spaced elevation values referenced horizontally either to a Universal Transverse Mercator (UTM) projection or to a geographic coordinate system. The grid cells are spaced at regular intervals along south to north profiles that are ordered from west to east. The U.S. Geological Survey (USGS) produces five primary types of elevation data: 7.5-minute DEM, 30-minute DEM, 1-degree DEM, 7.5-minute Alaska DEM, and 15-minute Alaska DEM.
Specifications
USGS
DEM Fact Sheet (81 Kb)
Available Projections
- UTM - NAD27 / NAD83 / WGS72 / WGS84
- State Plane NAD27 / NAD83
- Latitude / Longitude - NAD27 / NAD83 / WGS72 / WGS84
Available Formats
- USGS Standard DEM file format
- ESRI GRID
- ASCII Text, X,Y,Z format
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