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Global Change Master Directory (GCMD)
Digital Orthophoto Quadrangles for Portions of Wyoming
Entry ID: WYGISC_DOQQ


Summary
Abstract: DOQ's serve a variety of purposes, from interim maps to
field references for earth science investigations and
analysis. The DOQ is useful as a layer of a geographic
information system and as a tool for revision of digital
line graphs and topographic maps.

Orthophotos combine the image characteristics of a
photograph with the geometric qualities of a map. The
primary digital orthophotoquad (DOQ) is a 1-meter ground
resolution, quarter-quadrangle (3.75-minutes of latitude
by 3.75-minutes of longitude) image cast on the Universal
Transverse Mercator Projection (UTM) on the North
American Datum of 1983 (NAD83).The geographic extent of
the DOQ is equivalent to a quarter-quad plus The overedge
ranges a minimum of 50 meters to a maximum of 300 meters
beyond the extremes of the primary and secondary corner
points. The overedge is included to facilitate tonal
matching for mosaicking and for the placement of the NAD83
and secondary datum corner ticks. The normal orientation
of data is by lines (rows) and samples (columns). Each
line contains a series of pixels ordered from west to
east with the order of the lines from north to south.
The standard, archived digital orthophoto is formatted as
four ASCII header records, followed by a series of 8-bit
binary image data records. The radiometric image
brightness values are stored as 256 gray levels ranging
from 0 to 255.

The standard distribution format of DOQs will be BIL images
on CD-ROM or compressed JPEG for download. Currently only
images for the Jackson Hole area via the Spatial Data and
Visualization Center clearinghouse. An on-line image browser
is available (see the on-line linkage above) for viewing
available images for the state and may include downloading
capability as more images come on-line.

The compressed JPEG format will exhibit some radiometric
differences when compared to its uncompressed original but
will retain the geometry of the uncompressed DOQ.

Geographic Coverage
 N: 44.0 S: 43.0  E: -107.0  W: -111.36

Data Set Citation
Dataset Creator: U.S. Geological Survey
Dataset Title: Digital Orthophoto Quadrangles for Portions of Wyoming
Dataset Release Place: Reston, VA
Dataset Publisher: Wyoming Geographic Information Science Center
Version: Not provided
Data Presentation Form: remote-sensing image


Temporal Coverage
Start Date: 1994-02-22


Location Keywords
CONTINENT > NORTH AMERICA > UNITED STATES OF AMERICA > WYOMING


Science Keywords
LAND SURFACE >GEOMORPHIC LANDFORMS/PROCESSES    [Definition]
LAND SURFACE >TOPOGRAPHY >TOPOGRAPHIC EFFECTS    [Definition]
LAND SURFACE >TOPOGRAPHY    [Definition]


Platform
AERIAL PHOTOGRAPHS    [Information]


Access Constraints
None


Use Constraints
None. Acknowledgement of the U.S. Geological Survey would be appreciated in
products derived from these data.


Keywords
GIS
DOQ
DOQQ
digital orthophoto
digital orthophotoquad
digital image map
aerial photograph
rectified photograph
rectified image
orthophoto
quarter-quadrangle orthophoto
1-meter orthophoto


Data Set Progress
ACTIVE


Data Center
Wyoming Geographic Information Science Center, University of Wyoming    [Information]
Data Center URL: http://www.wygisc.uwyo.edu/

Data Center Personnel
Name: WYGISC TECHNICAL COORDINATOR
Phone: 307-766-2532
Fax: 307-766-2744
Contact Address:
WYGISC
1000 E University Ave Dept 4008
City: Laramie
Province or State: WY
Postal Code: 82071
Country: USA



Distribution
Distribution_Media: Online
Distribution_Format: Compressed USGS DOQ in JPEG format.
Fees: No fees


Personnel
MARGO BERENDSEN
Role: METADATA AUTHOR
Phone: 307-766-2751
Email: meh at uwyo.edu
Contact Address:
Wyoming Geographic Information Science Center
University of Wyoming
1000 E. University Ave.
City: Laramie
Province or State: WY
Postal Code: 82071
Country: USA


Extended Metadata Properties
(Click to view more)

Creation and Review Dates
DIF Creation Date: 2004-05-21
Last DIF Revision Date: 2018-11-08



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