INTRODUCTION AND METADATA FOR: PRELIMINARYDIGITAL GEOLOGIC MAP DATABASE FOR HONDURAS
1998

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
U.S. Geological Survey, 926A National Center, Reston, VA 20192
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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:

ARC VIEW:
San Pedro Zacapa Quadrangle (projection: geographic decimal degrees)
topo_sp.shp (.shx, .dbf)
hydro_sp.shp (.shx, .dbf)
bed_sp.shp (.shx, .dbf)
surf_sp.shp (.shx, .dbf)
fault_sp.shp (.shx, .dbf)

Honduras (projection: geographic decimal degrees)
av_geol.shp (.shx, .dbf)
av_hydro.shp (.shx, .dbf)

ARC/INFO:
San Pedro Zacapa Quadrangle (projection: UTM 16, datum: NAD 27, units: meters, spheroid, Clarke 1866)
sanp_topo.e00
sanp_hydro.e00
sanp_fault.e00
sanp_bed.e00
sanp_surf.e00

Honduras (projection: polyconic, datum: NAD 27, units: meters, spheroid: Clarke 1866, longitude of central meridian -86 15 0.000
latitude of projection origin 14 45 00)
hond_geol.e00
hond_hyd.e00

IMAGES (San Pedro Zacapa Quadrangle):
topo.gif
geol.gif
debris.gif
rio.gif

EPS FILES:
SanP_Plot.eps (Geologic Map of the San Pedro Zacapa Quadrangle) Hond_Plot.eps (Geologic Map of Honduras)
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DATA SET:

Title: Preliminary Digital Geological Map Database for Honduras 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:
Features-described attributes.txt
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Attributes-units: digital data compiled from published geologic maps at
scales of 1:500,000 and 1:50,000
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PRODUCTION OF DATA SET

Creation of data set: Eastern Region Geologic Mapping Team and Eastern Region Climate/Hazards Team, Geologic Division, U.S. Geological Survey

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
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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.
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CREATION OF DATA SET

Data sources:
(1) Kozuch, Michael J., compiler, 1991, Mapa Geologico de Honduras, Secretaria de Comunicaciones Obras Publicas y Transporte, Instituto Geografico Nacional, segunda edicion, 1:500,000. Preparado por el Instituto Geografico Nacional con la colaboracion del Cuerpo de Paz. Base Cartografica Carta Aeronautica escala 1:500,000,1985 elaborada por el Instituto Geografico Nacional y el InterAmerican Geodetic Survey. Impreso en el Instituto Geografico Nacional, 5-1991.(2) Instituto Geografico Nacional, 1979, (Geologic map of) San Pedro Zacapa quadrangle: Ministerio de Comunicaciones, Obras Publicas Transporte, Instituto Geografico Nacional, primera edicion, 1:50,000. Preparado dentro de un programa de cooperacion entre el Instituto Nacional del Ministerio de Comunicaciones, Obras Publicas y Transporte, la Direccion General de Minas e Hidrocarburos del Ministerio de Recursos Naturales, el Instituto Centroamericano de Investigacion y Tecnologia Industrial (ICAITI), y la Universidad de Texas en Austin, U.S.A. Levantamiento geologico efectuado por Richard C. Finch en 1969-1971. Base cartografica preparada por el Instituto Geografico Nacional (IGN) en colaboracion con el Inter-American Geodetic Survey (IAGS). Restituido en 1961 por el metodo estereofotgrametrico "MULTIPLEX" y "KELSH", basado en fotografias aereas tomadas en enero de 1955. Control Horizontal y vertical establecido por el Instituto Geografico Nacional e IAGS en 1958-59.

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
digital layers. These ARC/INFO coverages were then exported to ARC
VIEW .shp files.

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DATA RELIABILITY
Geologic Field Work: Methods of data collection and compilation are unknown. Digital compilation: Digital map coverages were produced within strict adherence to the National Map Accuracy Standards for the scale of the represented data.
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DISTRIBUTION
Legal restrictions on data: none, public domain Distributor: U.S. Geological Survey Name/number of data set: Open-file Report 98-774 Order from:
USGS Information Services
Box 25286
Denver Federal Center
Denver CO 80225-0046
Tel: 303-202-4200; Fax 303-202-4695
Format: CD-ROM
Fee: nominal
System/software requirements: ARC VIEW or ARC/INFO or compatible GIS software on a PC or UNIX system. Plot files in .eps format require graphics (image) software

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METADATA

Last modified: December 3, 1998
Last reviewed: December 3, 1998
Metadata authors: Peter G. Chirico and Gregory S. Gohn, USGS
Metadata standard: modified informal USGS standard Restrictions on metadata: none, public domain

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