GEOLOGIC MAP OF YOSEMITE NATIONAL PARK, CALIFORNIA


Compiled by N. King Huber, Paul C. Bateman, and Clyde Wahrhaftig
Digital database by D. Aitken and E. Phillips


Miscellaneous Investigations Series Map I-Map i-1874

version 2.0 

2003


Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government.  This database, identified as "Geologic Map of Yosemite National Park, California" has been approved for release and publication by the Director of the USGS.



U.S. DEPARTMENT OF INTERIOR
U.S. GEOLOGICAL SURVEY



For general information about the content of this map, call:
1-888-ASK-USGS



TABLE OF CONTENTS

	INTRODUCTION
		General
	HOW TO OBTAIN PAPER PLOTS
	DATABASE CONTENTS
		Data package
	DIGITAL GEOLOGIC MAP SPECIFICATIONS
		Digital compilation
		Spatial resolution
		Database specifics
		      Lines
		      Polygons
	REFERENCES



INTRODUCTION

General

Miscellaneous Investigations Series Map I-1874 contains a digital geologic map database of Yosemite National Park, California that includes:

1. ARC/INFO (Environmental Systems Research Institute, http://www.esri.com) version 8.3 coverage of the various elements of the geologic map (yosenp.e00).
	
2. Portable Document Format (.pdf) files (i1874scan.pdf) of the graphic scanned from the original paper version of the map for print.  Test plots have not produced precise 1:24,000-scale map sheets.  Adobe Acrobat page size setting influences map scale.
	
3. Text file (meta.txt) of FGDC-compliant metadata.
	
4. This "read me" text description (readme.txt).
	

The Correlation of Map Units and Description of Map Units is present within the PDF print version as originally published and has not been altered.  Within the geologic map data package, map units are identified by PTYPE, which correlate to the abbreviations used in the PDF. 

Even though this is a Miscellaneous Investigations Series Map and includes the standard USGS disclaimer, the report closely adheres to the stratigraphic nomenclature of the U.S. Geological Survey.  Descriptions of units can be obtained by viewing or plotting the .pdf file (2 above).


HOW TO OBTAIN PAPER MAPS

For those having access to large-format plotters such as HP650C, HP755C, and HP2500C, print copies may be made directly from the included PDF file.


DATABASE CONTENTS

The files constituting the geologic map database of this report are listed below along with the interchange files from which they were extracted.

Data  Package (E00)

ARC/INFO interchange files containing coverages of Yosemite National Park.  yosenp.e00 contains: contacts, faults, geologic units and labels.

Portable Document Format (PDF)

Read using: Adobe Acrobat or any other PDF reader
A raster file of the originally published (1989) map. i1874scan.pdf contains geologic unit descriptions and regional geologic history references, as well as the originally printed map.  Scanned in 2003.

DIGITAL  GEOLOGIC  MAP  SPECIFICATIONS

Digital  compilation

The geologic map information was transferred from the original Scitex RES280 raster cartographic system into ARCGIS 8.3 format of the geologic map at 1:125,000 scale.  

Spatial resolution

Use of this digital geologic map database should not violate the spatial resolution of the data. Although the digital form of the data removes the constraint imposed by the scale of a paper map, the detail and accuracy inherent in map scale are also present in the digital data. The fact that this database was edited at a scale of 1:125,000 means that higher resolution information is not generally present in the dataset. Plotting at scales larger than 1:125,000 will not yield greater real detail, although it may reveal fine-scale irregularities above the intended resolution of the database. Similarly, although higher resolution data is incorporated at a few places, the resolution of the combined output will be limited by the lower resolution data.   


Database specifics

The content of the geologic database can be described in terms of feature classes that include lines, and areas that compose the map.  See the metadata text file (meta.txt) for detailed descriptions.

Lines - Lines are recorded as strings of arcs and are described in an arc attribute (.aat) table as LTYPE. They represent contacts and faults, which define the boundaries of map units and map boundaries.

Polygons --- Geologic map units (polygons) are described in the polygon attribute (.pat) table as PTYPE.  For traditional descriptions of the map units, see the Portable Document Format file yosemite.pdf.  


REFERENCES:

Provided in the PDF - i1874scan.pdf