Flow Direction grid calculated in ARC/Info version 7.0.2 from USGS 30m DEM of Los Olivos quadrangle

Metadata:

• Identification_Information
• Spatial_Data_Organization_Information
• Metadata_Reference_Information

Identification_Information:

Citation:

Citation_Information:

Originator: USGS (modified by Karen Holmes, 1999)

Publication_Date: 19790701

Title:

Flow Direction grid calculated in ARC/Info version 7.0.2 from USGS 30m DEM of Los Olivos quadrangle

Geospatial_Data_Presentation_Form: map

Online_Linkage: <http://edcwww.cr.usgs.gov/nsdi/html/dem75>

Description:

Abstract:

Flow direction calculated in ARC/Info version7.0.2 using FLOWACCUMULATION command on cropped, "FILLED", USGS DEM (see text below). Flow direction is direction in which water would flow from each cell on the DEM. Arc uses an 8-directional flow algorithm, so each cell value corresponds to one of the following ( I think): 1(east), 2(se), 4(s), 8(sw), 16(w), 32(nw), 64(n), 128 (ne). NOT a realistic hydrologic property of the lands surface. (see Arc Help references.) (From USGS web document) Digital Elevation Model (DEM) is the terminology adopted by the USGS to describe terrain elevation data sets in a digital raster form. The standard DEM consists of a regular array of elevations cast on a designated coordinate projection system. The DEM data are stored as a series of profiles in which the spacing of the elevations along and between each profile is in regular whole number intervals. The normal orientation of data is by columns and rows. Each column contains a series of elevations ordered from sourth to north with the order of the columns from east to west. THe DEM is formatted as one ASCII header record (A-record) , followed by a series of profile records (B- records) each of which include a shorth B-record header followed by a series of ASCII integer elevations per each profile. The last physical record of the DEM is an accuracy record (C- record). 7.5-minute DEM (30- by 30-m data spacing, cast on Universal Transverse Mercator (UTM) projection). Provides coverage in 7.5 by 7.5 minute blocks. Each product provides the same coverage as a standard USGS 7.5minute quadrangle without over edge.

Purpose:

Supplemental_Information:

***** Spatial Reference Information (Beg) *****
Projection Parameters
Projection:  UTM
Zone:  10
Datum:  NAD83
Units:  Meters
Spheroid:  GRS1980
x-minimum:  768129.000
x-maximum:  774369.000
y-minimum:  3841407.250
y-maximum:  3848607.250
Spatial Information
Raster:
Number of Columns: 208
Number of Rows: 240
Pixel Resolution (m): 30
Data Type: byte
***** Spatial Reference Information (End) *****

Time_Period_of_Content:

Time_Period_Information:

Range_of_Dates/Times:

Beginning_Date:

Ending_Date: present

Currentness_Reference:

Status:

Progress: Complete

Maintenance_and_Update_Frequency:

Spatial_Domain:

Bounding_Coordinates:

West_Bounding_Coordinate:

East_Bounding_Coordinate:

North_Bounding_Coordinate:

South_Bounding_Coordinate:

Keywords:

Theme:

Theme_Keyword_Thesaurus: None

Theme_Keyword: DEM

Theme_Keyword: flow direction

Theme_Keyword: stream lines

Place:

Place_Keyword_Thesaurus: None

Place_Keyword: Los Olivos

Place_Keyword: Santa Barbara county

Place_Keyword: California

Place_Keyword: Sedgwick

Access_Constraints:

Use_Constraints:

Spatial_Data_Organization_Information:

Direct_Spatial_Reference_Method: Raster

Metadata_Reference_Information:

Metadata_Date: 19990626

Metadata_Contact:

Contact_Information:

Contact_Person_Primary:

Contact_Person: Karen Holmes

Contact_Organization: UCSB Geography Dept.

Contact_Address:

Address_Type: mailing and physical address

Address:

c/o Reserve Director Sedgwick Natural Reserve Marine Science Institute University of California Santa Barbara, CA 93106

City:

State_or_Province:

Postal_Code:

Contact_Voice_Telephone:

Contact_Electronic_Mail_Address: karen@geog.ucsb.edu

Metadata_Standard_Name: FGDC Content Standards for Digital Geospatial Metadata

Metadata_Standard_Version: FGDC-STD-001-1998