Landslides in Alameda County, California, A Digital Database Extracted from Preliminary Photointerpretation Maps of Surficial Deposits by T.H. Nilsen in USGS Open-File Report 75-277

Landslides in Alameda County, California, A Digital Database Extracted from Preliminary Photointerpretation Maps of Surficial Deposits by T.H. Nilsen in USGS Open-File Report 75-277

The eight sets of digital files comprising the database are encoded in more than one format. Names of the files are unique designators based on the report identifier, of99-504, followed by part numbers (i.e. 1 through 8 below) and an extension indicating file type. Some files have been bundled using the tar (UNIX Tape Archive) utility (.tar extension). All larger files have been compressed with the gzip utility, indicated by the .gz extension. The files and their identities are as follows:

1. Revision List: A list of the parts of the report and at what version number of the report each was last revised (if at all) followed by a chronological list that describes any revisions (see REVISIONS, below).
of99-504revs_1a.txt (4 Kb)		ASCII file

2. Open File Text: The open-file pamphlet (this text), which describes the database and how to obtain it.
of99-504_2a.txt (52 Kb)		ASCII file
of99-504_2b.ps (548 Kb)		Postscript file
of99-504_2c.pdf (68 Kb)		PDF file

3. Database for Landslide Deposits: ARC export coverage containing both lines and polygons. Import aml will name this coverages al-slid_um.
of99-504_3.e00.gz (2.7 MB)		Arc export coverage

4. Database for Small Landslide Deposits: ARC export coverage for La Costa Valley quadrangle containing points. Import aml will name this coverage lc-smls_um.
of99-504_4.e00.gz (4 Kb)		Arc export coverage

5. Line and polygon ARCVIEW shape files bundled as one tar file. When opened, the tar file yields:
-line files	al-arc.dbf	al-arc.shp	and al-arc.shx
-polygon files	al-poly.dbf	al-poly.shp	and al-poly.shx
-point files	lc-smls.dbf	lc-smls.shp	and lc-smls.shx
Note: Point files exist only for the La Costa Valley quadrangle.
of99-504_5.tar.gz (5.1 MB)		ARCVIEW shape files

6. Supporting files for ARC/INFO use, bundled as one tar file. When opened, the tar file yields:
utm2sp.prj and sp2utm.prj: These are projection files to convert between the UTM zone 10 projection of the database and state plane projection.
import.aml: This is an ASCII script written in Arc Macro Language for converting the ARC export files into usable coverages and INFO files that are assigned standard names (see IMPORTING THE ARC EXPORT FILES).
of99-504_6.tar (8Kb)

7. Quadrangle Index Database: The data files representing lines and polygons of the quadrangle index (ARC export and ARCVIEW shape format). The ARC version also includes quadrangle names as annotation.
of99-504_7a.e00.gz (32 Kb)	ARC export coverage containing lines, polygons, and annotation. Import.aml will name this coverage al- index_um.
of99-504_7b.tar.gz (36 Kb)	Line and polygon ARCVIEW shape files bundled as one tar file. When opened, the tar file yields:
	line files:	grdlns.dbf,	grdlns.shp,	grdlns.shx
	polygon files:	grdpys.dbf,	grdpys.shp,	grdpys.shx

8. Plot Files for the Map: Landslide Deposits in Alameda County, which measures 36 by 53 inches when plotted.
of99-504_8a.ps.gz (3 MB)		Postscript file (12 MB compressed to 3 MB)
of99-504_8b.pdf (4.2 MB)		PDF file (4.5 MB) Viewable only using Adobe Acrobat Version 4.0
		Download Adobe Acrobat Version 4.0

If you have trouble using any of the above files, you might want to consult OPENING THE DATABASE FILES

USGS Information Services, Box 25286,
Federal Center, Denver, CO 80225
telephone: 303-202-4210; e-mail: infoservices@usgs.gov

URL of this page: http://geopubs.wr.usgs.gov/open-file/of99-504/
Maintained by: Carolyn Donlin
Created: 2-4-00
Last modified: 4-14-00 (cad)