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hbef_10mdem
Hubbard Brook Experimental Forest 10m DEM: Raster GeoTiFF
John
Campbell
USDA Forest Service
PO Box 640
Durham
NH
03824
USA
(603)-868-7643
2016
The 7.5-minute digital elevation model (DEM) data are digital representations of
cartographic information in a raster form. The DEMs consist of an array of
elevations for ground positions at regularly spaced intervals. The data are produced
in 7.5- by 7.5-minute blocks from either digitized cartographic map contour overlays
of a scanned National Aerial Photography Program (NAPP) photographs. The DEM data
are stored as profiles with a 10- or 30-meter square grid spacing along and between
each profile. The original USGS DEM data (Mt. Kineo and Woodstock quadrangles) were
merged and projected into UTM Zone 19. The resultant grid was clipped to a box
surrounding the USDA Forest Service, Hubbard Brook Experimental Forest. Data distributed as GeoTIFF format in
Coordinate system EPSG:26919 - NAD83 / UTM zone 19N.
DEM
Digital elevation model
US Forest Service
Digital terrain model
Hypsography
Altitude
Height
Contour
Hubbard Brook
New Hampshire
HBR
Hubbard Brook LTER
None
Data Use Policy
The re-use of scientific data has the potential to greatly
increase communication, collaboration and synthesis within and among
disciplines, and thus is fostered, supported and encouraged. Permission to
use this dataset is granted to the Data User free of charge subject to the
following terms:
1) Acceptable use. Use of the dataset will be restricted to academic, research,
government or other not-for-profit professional purposes.
2) Redistribution. The data and metadata are provided for use by the Data User.
The Data User will not redistribute the original Data Set or metadata to
others without the explicit permission of the Principal Investigator.
3) Citation. It is considered a matter of professional ethics to acknowledge the work
of other scientists. Thus, the Data User will properly attribute
the Data Set in any publications or in the metadata of any derived data products
that were produced using the Data Set. Citation should take the
following general form: Creator, Year of Data Publication, Title of Dataset,
Publisher, Dataset identifier.
Citation example: Holmes, R.T. 2012. Bird Abundances at Hubbard Brook (1969-2010)
and on three replicate plots (1986-2000) in the White Mountain
National Forest. Durham, NH. Hubbard Brook Data Archive [Database].
http://hubbardbrook.org/data/dataset.php?id=81 (23 July 2012)
4) Acknowledgment: The Data User should acknowledge any institutional support or specific
funding awards referenced in the metadata accompanying this
dataset in any publications where the Data Set contributed to its content. Acknowledgments
should identify the supporting party, the party that received
the support, and any identifying information such as grant numbers.
Acknowledgment example: Data on [topic] were provided by [name of PI] on [date].
These data were gathered as part of the Hubbard Brook Ecosystem
Study (HBES). The HBES is a collaborative effort at the Hubbard Brook Experimental Forest,
which is operated and maintained by the USDA Forest Service,
Northern Research Station, Newtown Square, PA. Significant funding for collection of these
data was provided by [agency]-[grant number], [agency]-[grant
number], etc.
5) Consultation and questions. Data users are strongly encouraged to consult with the Principal
Investigator(s) who collected these data for further information. Also, when appropriate,
Data Users should consider including the Principal Investigator as a collaborator and/or co-author
in the use of these data.
6) Notification. The Data User will notify the Principal Investigator of any publication or
derivative work based on the Data Set. The Data User will
also provide the Principal Investigator and/or the administrator of the Hubbard Brook
Ecosystem Study with a pdf or two reprints of any publication(s)
resulting from use of the Data Set.
7) Disclaimer. While substantial efforts are made to ensure the accuracy of data
and documentation contained in this Data Set, complete accuracy of data and
metadata cannot be guaranteed. All data and metadata are made available "as
is". The Data User holds all parties involved in the production or
distribution of the Data Set harmless for damages resulting from its use or
interpretation.
8) Terms of Agreement. By accepting this Data Set, the Data User agrees to abide by the
terms of this agreement. The Data Owner shall have the right to terminate
this agreement immediately by written notice upon the Data User's breach of,
or non-compliance with, any of its terms. The Data User may be held
responsible for any misuse that is caused or encouraged by the Data User's
failure to abide by the terms of this agreement.
http://www.hubbardbrook.org/gis
2001-01-01
Hubbard Brook
-71.829397
-71.661642
43.977538
43.898043
Information Manager, Hubbard Brook LTER
234 Mirror Lake Road
North Woodstock
NH
03262
USA
(603) 726-8902
hbr-im@lternet.edu
http://www.hubbardbrook.org
USDA Forest Service
Northeastern Research Station
USDA Forest Service
PO Box 640
Durham
NH
03801
USA
(603) 868-7643
(603) 868-7604
The production procedures, instrumentation, hardware and software used in
the collection of standard U. S. Geological Survey (USGS) Digital Elevation
Models (DEMs) vary depending on the systems used at the contractor,
cooperator or National Mapping Division (NMD) production sites. This process
step describes, in general, the process used in the production of standard
USGS DEM datasets. Level 1 DEM: Level 1 DEMs are acquired
photogrammetrically by manual profiling or image correlation techniques from
either the National Aerial Photography Program (NAPP) or equivalent source
photographs. Level 1 30-minute DEMs may be derived or resampled from Level 1
7.5- minute DEMs. Level 2 DEM: Level 2 DEMs are produced by converting
1:24,000-scale and 1:100,000-scale hypsography digital line graph (DLG) data
into DEM format or the DEMs can be generated from vector data derived from
scanned raster files of USGS 1:24.000-scale or 1:100,000-scale map series
contour separates. Level 3 DEM: Level 3 DEMs are created from DLG data that
has been vertically integrated with all categories of hypsography,
hydrography, ridge line, break line, drain files and all vertical and
horizontal control networks. The production of Level 3 DEMs requires a
system of logic incorporated into the software interpolation algorithms that
clearly differentiates and correctly interpolates between the various types
of terrain, data densities and data distribution. Water body editing: DEM
surface areas corresponding to water bodies are flattened and assigned
either map specified or estimated surface elevations. Water body areas are
defined as ponds, lakes, and reservoirs that exceed 0.5 inches at map scale
and double line drainage that exceeds 0.25 inches at map scale. Water body
shorelines are derived from either a hypsographic DLG or by interactive
delineation from a 1:24,000- or 1:100,000-scale USGS map series. DEMs are
verified for physical format and logical consistency.
The horizontal accuracy of the DEM is expressed as an estimated root
mean square error (RMSE). The estimate of the RMSE is based upon horizontal
accuracy tests of the DEM source materials that are selected as equal to or less
than the intended horizontal RMSE error of the DEM. The testing of source
material horizontal accuracy is accomplished by comparing the planimetric (X and
Y) coordinates of well-defined ground points with the coordinates of the same
points as determined from a source of higher accuracy. 1
meter(s)
The vertical RMSE statistic is used to describe the vertical
accuracy of a DEM and encompasses both random and systematic errors introduced
during production of the data. The RMSE is encoded in element number 5 of record
C of the DEM. Accuracy is computed by a comparison of linear interpolated
elevations in the DEM with corresponding known elevations. Test points are well
distributed, representative of the terrain, and have true elevations with
accuracies well within the DEM accuracy criteria. Acceptable test points
include, in order of preference: field control, aerotriangulated test points,
spot elevations, or points on contours from existing source maps with
appropriate contour interval. A minimum of 28 test points per DEM is required to
compute the RMSE, which is composed of a single test using 20 interior points
and 8 edge points. Edge points are those which are located along, at, or near
the quadrangle neatlines and are deemed by the editor to be useful to evaluating
the accuracy of the edge of the DEM. Collection of test point data and
comparison of the DEM with the quadrangle hypsography are conducted by the
quality control units within the USGS. There are three types of DEM vertical
errors: blunder, systematic, and random. These errors are reduced in magnitude
by editing but cannot be completely eliminated. Blunder errors are those errors
of major proportions and are easily identified and removed during interactive
editing. Systematic errors are those errors that follow some fixed pattern and
are introduced by data collection procedures and systems. Random errors result
from unknown or accidental causes. 2 meter(s)
Cell size = 10m; number of bands=1
7.5 minute Digital Elevation Models
US Geological Survey
2001-01-01
hbef_10mdem.zip
Hubbard Brook Experimental 10m DEM
hbef_10mdem.zip
.zip file
http://hubbardbrook.org/gis/giszip/hbef_10mdem.zip
compressed data file