INTRODUCTION AND METADATA FOR: PRELIMINARYDIGITAL GEOLOGIC MAP DATABASE FOR HONDURAS
U.S. Geological Survey Open-file Report 98-774
by Gerald F. Wieczorek, Wayne L. Newell, Peter G. Chirico, and Gregory S. Gohn (USGS), Remo Nardini (George Washington University), and Trevor Putbrese (Mary Washington College)
Original Release: CD-ROM
This report contains the ARC VIEW and ARC/INFO data files for a preliminary geologic-map database of Honduras at noominal 1:500,000 scale. In addition, the ARC VIEW and ARC/INFO data files for a preliminary geologic-map database of the Sen Pedro Zacapa Quadrangle (nominal 1:50,000), west-central Honduras, are included. Image and text files related to these GIS databases also are included.
This report is preliminary and has not been reviewed for conformity with U.S. Geological Survey editorial standards or with the North American Stratigraphic Code. Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government.
Although these files have been used by the U.S. Geological Survey, no warranty, expressed, or implied, is made by the USGS as to their accuracy and functioning, nor shall the fact of distribution constitute any such warranty, and no responsibility is assumed by the USGS in conjunction therewith.
ARC/INFO and ARC VIEW are registered trademarks of Environmental Systems Research Institute, Inc., Redlands, CA, USA. -----------
The files included in these databases are as follows:
Honduras (projection: geographic decimal degrees)
Honduras (projection: polyconic, datum: NAD 27, units: meters,
spheroid: Clarke 1866, longitude of central meridian -86 15 0.000
IMAGES (San Pedro Zacapa Quadrangle):
Title: Preliminary Digital Geological Map Database for
Geographic area: Honduras, Central America; with additional coverages
for the San Pedro Zacapa Quadrangle, west-central Honduras
Time frame of data set: National geological map database, circa 1991 San
Pedro Zacapa quadrangle, circa 1969-1971
Data type: digital geologic-map coverages with attribute tables and digital basemap coverages Geographic features- representation: points, lines, and polygons Geographic features-storage: ARC/INFO GIS - vector file format eographic features-how described: polygons represent bedrock and surficial geologic formations; linear data represents geologic structures, rivers
Features-types: bedrock geology, surficial geology, geologic structures, rivers, topography Features-described attributes: (following tables)
The tables are available to view or download:
Attributes-units: digital data compiled from published geologic maps
PRODUCTION OF DATA SET
Creation of data set: Eastern Region Geologic Mapping Team and
Region Climate/Hazards Team, Geologic Division, U.S. Geological
Authors: Gerald F. Wieczorek, Wayne L. Newell, Peter G. Chirico,
Gregory S. Gohn, Remo Nardini, and Trevor Putbrese
Compilers and editors: Peter G. Chirico, Remo Nardini, Trevor Putbrese, Gregory S. Gohn, James E. Reddy, and Luke Blair
Direct questions to: Chief, Eastern Region Geologic Mapping Team,
USGS, 926A National Center, Reston, VA 20192
PURPOSE OF DATA SET
Objective: Produce digital geologic-map databases as part of the USGS response to flood and landslide damage in Central America caused by Hurricane Mitch in October-November, 1998.
Limitations: This data set should not be used at scales larger than those
of the original source material (1:500,000; 1:50,000). Qualitative landslide susceptibilities assigned to geologic units in the national
geologic-map database represent only a preliminary and data-limited assessment. The indicated landslide susceptibilities are provided as a guide to future research and should not be used as the sole source of landslide information for engineering purposes on Honduras.
CREATION OF DATA SET
Data processing: Mylar separates were hand-drafted from the source
maps.Separates were scanned on an Anatech 4080ET large-format scanner as .tif files. These .tif files were vectorized using GTX OSR vectorizing software into a .dxf format. The .dxf files were imported into ARC/INFO where they were edited and attributed to produce topologically correct
Last modified: December 3, 1998
Maintained by: EESP Team Staff
Contact: Peter Chirico (firstname.lastname@example.org)