Shoreline -196ft Elevation

Metadata:

Identification_Information:
Citation:
Citation_Information:
Originator: Kenneth Althiser
Publication_Date: August 1, 2003
Title: Shoreline -196ft Elevation
Geospatial_Data_Presentation_Form: vector digital data
Online_Linkage:
http://www.institute.redlands.edu/salton/downloads/shapefiles/SS_Shoreline_196.zip
Description:
Abstract:
This coverage depicts the highest stand, since its formation in 1905, of the Salton Sea, the latest incarnation of the prehistoric Lake Cahuilla. The highest level of the Sea was determined by referring to a list of historical elevations, collected monthly or daily, since the lake's year of formation. This level was achieved in 1906, shortly after which the breach was sealed, and inflow stopped. This coverage was developed by separating cells in the 30 meter digital elevation model of the Salton Sea Basin which have elevation values below the -196 elevation mark versus those that are above, and generating a polygon coverage from the results. The linework was then generalized with a weed tolerance of 20 meters to smooth the "squared cell boundaries" typical of data generated from a raster data source.
Purpose:
This coverage has been provided to indicate, in general, for cartographic purposes the highest elevation the Salton Sea has achieved since its reformation in 1905. This may be important when considering impacts of restoration alternatives and the placement of landuse in the region.
Supplemental_Information:
The highest elevation the Salton Sea has attained was achieved in 1906, shortly after which the breach in the canals in Mexico were sealed, and inflow ceased. This resulted in the lowering of the Sea for a time until the inception of agriculture in the Imperial Valley, which gradually achieved an equilibrium in the late 1950's balancing inflow with evaporation.
Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: July 28, 2003
Currentness_Reference: publication date
Status:
Progress: Complete
Maintenance_and_Update_Frequency: None planned
Spatial_Domain:
Bounding_Coordinates:
West_Bounding_Coordinate: -116.104711
East_Bounding_Coordinate: -115.539724
North_Bounding_Coordinate: 33.558560
South_Bounding_Coordinate: 33.065757
Keywords:
Theme:
Theme_Keyword_Thesaurus: None
Theme_Keyword: historical shoreline
Theme_Keyword: high water mark
Theme_Keyword: bathymetry
Theme_Keyword: digital elevation model
Theme_Keyword: Lake Cahuilla
Theme:
Theme_Keyword_Thesaurus: ISO 19115 Topic Category
Theme_Keyword: Geological and geophysical
Place:
Place_Keyword_Thesaurus: None
Place_Keyword: Salton Sea
Access_Constraints: None.
Use_Constraints: None.
Point_of_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Kenneth C. Althiser
Contact_Organization: Redlands Institute
Contact_Position: Senior GIS Analyst
Contact_Voice_Telephone: (909) 335-2568
Browse_Graphic:
Browse_Graphic_File_Name: None
Security_Information:
Security_Classification_System: None
Security_Classification: Unclassified
Security_Handling_Description: None
Native_Data_Set_Environment:
Microsoft Windows XP Version 5.1 (Build 2600) Service Pack 2; ESRI ArcCatalog 9.1.0.780
Cross_Reference:
Citation_Information:
Title: None
Data_Quality_Information:
Attribute_Accuracy:
Attribute_Accuracy_Report:
Polygon and chain-node topology is present. The data is processed through the standard ArcInfo and ArcEdit checks on arc and polygon topology.
Logical_Consistency_Report:
The data set was checked for topological consistency for both arcs and polygons using the ArcInfo command BUILD with both the line and poly options.
Completeness_Report:
The data is complete, and all arcs and polygons are attributed. Data was generalized using a 20m weed tolerance for generalizing data from a 30m DEM raster dataset.
Positional_Accuracy:
Horizontal_Positional_Accuracy:
Horizontal_Positional_Accuracy_Report:
Estimated to be +/- 30 meters, based on the DEM file source from which the data was derived.
Vertical_Positional_Accuracy:
Vertical_Positional_Accuracy_Report: Same as the DEM upon which the dataset was derived.
Lineage:
Process_Step:
Process_Description:
The highest level of the Sea was determined by referring to a list of historical elevations of the Sea since its year of formation. This coverage was developed by selecting cells from the 30m digital elevation model of the Salton Sea Basin that were below the -196 elevation mark versus those that are above, and generating a polygon coverage from the results. The linework was then generalized with a weed tolerance of 20 meters to smooth the "squared cell boundaries" typical of data generated from a raster source. Appropriate attribute fields were added and filled for both the arcs and polygons.
Process_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Kenneth C. Althiser
Contact_Organization: Redlands Institute
Contact_Position: Senior GIS Analyst
Contact_Voice_Telephone: (909) 335-5268
Process_Step:
Process_Description: Dataset moved.
Source_Used_Citation_Abbreviation: R:\temp\SS\shoreline_196_polygon
Process_Step:
Process_Description: Dataset copied.
Source_Used_Citation_Abbreviation:
Process_Step:
Process_Description: Dataset copied.
Source_Used_Citation_Abbreviation:
Server=ri-devcomp-1; Service=5151; Database=sde; User=sa; Version=sde.DEFAULT
Process_Step:
Process_Description: Dataset copied.
Source_Used_Citation_Abbreviation:
Server=ri-dbserv-2.institute.redlands.edu; Service=5151; Database=sde; User=sde; Version=sde.DEFAULT
Process_Step:
Process_Description: Dataset copied.
Source_Used_Citation_Abbreviation:
Server=ri-dbserv-2.institute.redlands.edu; Service=5181; Database=sde_temp; User=sde_admin; Version=sde.DEFAULT
Process_Step:
Process_Description: Dataset copied.
Source_Used_Citation_Abbreviation:
Server=ri-dbserv-2; Service=5151; Database=sde; User=sde_admin; Version=sde.DEFAULT
Process_Step:
Process_Description: Dataset copied.
Source_Used_Citation_Abbreviation:
Server=ri-dbserv-2.institute.redlands.edu; Service=5185; Database=sde_ssdp; User=sde_admin; Version=sde.DEFAULT
Cloud_Cover: N/A
Spatial_Data_Organization_Information:
Direct_Spatial_Reference_Method: Vector
Point_and_Vector_Object_Information:
SDTS_Terms_Description:
SDTS_Point_and_Vector_Object_Type: G-polygon
Point_and_Vector_Object_Count: 31
SDTS_Terms_Description:
SDTS_Point_and_Vector_Object_Type: Label point
Point_and_Vector_Object_Count: 31
SDTS_Terms_Description:
SDTS_Point_and_Vector_Object_Type: GT-polygon composed of chains
Point_and_Vector_Object_Count: 31
SDTS_Terms_Description:
SDTS_Point_and_Vector_Object_Type: Point
Point_and_Vector_Object_Count: 4
Spatial_Reference_Information:
Horizontal_Coordinate_System_Definition:
Geographic:
Latitude_Resolution: 0.000000
Longitude_Resolution: 0.000000
Geographic_Coordinate_Units: Decimal degrees
Geodetic_Model:
Horizontal_Datum_Name: North American Datum of 1983
Ellipsoid_Name: Geodetic Reference System 80
Semi-major_Axis: 6378137.000000
Denominator_of_Flattening_Ratio: 298.257222
Vertical_Coordinate_System_Definition:
Altitude_System_Definition:
Altitude_Resolution: 1.000000
Altitude_Encoding_Method:
Explicit elevation coordinate included with horizontal coordinates
Entity_and_Attribute_Information:
Detailed_Description:
Entity_Type:
Entity_Type_Label: SS_Shoreline_196
Entity_Type_Definition: Arc Attribute Table
Attribute:
Attribute_Label: LAKE
Attribute:
Attribute_Label: OBJECTID
Attribute_Definition: Internal feature number.
Attribute_Definition_Source: ESRI
Attribute_Domain_Values:
Unrepresentable_Domain:
Sequential unique whole numbers that are automatically generated.
Attribute:
Attribute_Label: SHAPE
Attribute_Definition: Feature geometry.
Attribute_Definition_Source: ESRI
Attribute_Domain_Values:
Unrepresentable_Domain: Coordinates defining the features.
Attribute:
Attribute_Label: FID
Attribute_Definition: Internal feature number.
Attribute_Definition_Source: ESRI
Attribute_Domain_Values:
Unrepresentable_Domain:
Sequential unique whole numbers that are automatically generated.
Attribute:
Attribute_Label: Shape
Attribute_Definition: Feature geometry.
Attribute_Definition_Source: ESRI
Attribute_Domain_Values:
Unrepresentable_Domain: Coordinates defining the features.
Attribute:
Attribute_Label: SHAPE_area
Attribute_Definition: Area of feature in internal units squared.
Attribute_Definition_Source: ESRI
Attribute_Domain_Values:
Unrepresentable_Domain: Positive real numbers that are automatically generated.
Attribute:
Attribute_Label: SHAPE_len
Detailed_Description:
Entity_Type:
Entity_Type_Label: shoreline_196.pat
Entity_Type_Definition: Polygon Attribute Table
Attribute:
Attribute_Label: FID
Attribute_Definition: Internal feature number.
Attribute_Definition_Source: ESRI
Attribute_Domain_Values:
Unrepresentable_Domain:
Sequential unique whole numbers that are automatically generated.
Attribute:
Attribute_Label: Shape
Attribute_Definition: Feature geometry.
Attribute_Definition_Source: ESRI
Attribute_Domain_Values:
Unrepresentable_Domain: Coordinates defining the features.
Attribute:
Attribute_Label: AREA
Attribute_Definition: Area of feature in internal units squared.
Attribute_Definition_Source: ESRI
Attribute_Domain_Values:
Unrepresentable_Domain: Positive real numbers that are automatically generated.
Attribute:
Attribute_Label: PERIMETER
Attribute_Definition: Perimeter of feature in internal units.
Attribute_Definition_Source: ESRI
Attribute_Domain_Values:
Unrepresentable_Domain: Positive real numbers that are automatically generated.
Attribute:
Attribute_Label: SHORELINE_196#
Attribute_Definition: Internal feature number.
Attribute_Definition_Source: ESRI
Attribute_Domain_Values:
Unrepresentable_Domain:
Sequential unique whole numbers that are automatically generated.
Attribute:
Attribute_Label: SHORELINE_196-ID
Attribute_Definition: User-defined feature number.
Attribute_Definition_Source: ESRI
Attribute:
Attribute_Label: LAKE
Attribute_Definition: Indicates whether polygon is part of the lake or not.
Distribution_Information:
Resource_Description: Downloadable Data
Standard_Order_Process:
Digital_Form:
Digital_Transfer_Information:
Transfer_Size: 0.050
Metadata_Reference_Information:
Metadata_Date: 20060906
Metadata_Review_Date: July 28, 2003
Metadata_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: Redlands Institute
Contact_Person: Kenneth C. Althiser
Contact_Position: Senior GIS Analyst
Contact_Address:
Address_Type: mailing and physical address
Address: 1200 East Colton Avenue
Address: PO Box 3080
City: Redlands
State_or_Province: CA
Postal_Code: 92373
Country: United States of America
Contact_Voice_Telephone: (909) 335-5268
Contact_Facsimile_Telephone: (909) 307-6952
Metadata_Standard_Name: FGDC Content Standards for Digital Geospatial Metadata
Metadata_Standard_Version: FGDC-STD-001-1998
Metadata_Time_Convention: local time
Metadata_Access_Constraints: None.
Metadata_Use_Constraints: None.
Metadata_Security_Information:
Metadata_Security_Classification_System: None
Metadata_Security_Classification: Unclassified
Metadata_Security_Handling_Description: None
Metadata_Extensions:
Online_Linkage: <http://www.esri.com/metadata/esriprof80.html>
Profile_Name: ESRI Metadata Profile
Generated by mp version 2.8.6 on Wed Sep 06 15:56:53 2006