Kenneth C. Althiser 20071102 vector digital data https://wildlife.ca.gov/Data/BIOS ftp://ftp.wildlife.ca.gov/BDB/GIS/BIOS/Public_Datasets/300_399/ds386.zip This data set contains bathymetric isolines for the Salton Sea at an interval of five feet. This data was generated from the sounding points taken by Bureau of Reclamation staff as part of a reconnaissance study perfomed for the Salton Sea Science Advisory Committee. This data has been extensively computer-generalized and manually smoothed using a graphic editor. Every fifth contour has also been coded as an index contour to mimic conventional symbolization of topography and bathymetry, and all contours have been assigned both elevation and depth. This data was automated to support normal graphic products of the Salton Sea in which depth or elevation of the lake bed are required. For engineering purposes, the user should return to the original sounding points to regenerate a lake floor surface, but for cartographic depiction, this database should be sufficient. Initially upon generation, many contours overlapped as an artifact of the arc interpolation techniques, and due to the state of the points, which display anomalous linear patterns indicative of a certain degree of error within specific transects. These linear patterns were largely filtered out in generating the isolines, but some topographic features suggestive of islands may be remaining artifacts of the data points and their interpolation. This data is considered preliminary, and will be updated once additional shoreline and sounding data becomes available. Complete None planned -116.105623 -115.571057 33.535292 33.085909 None contours, bathymetry, isolines, sounding points, oceans, planning, cadastre ISO 19115 Topic Categories planningCadastre oceans None Salton Sea California None Disclaimer: The State makes no claims, promises, or guarantees about the accuracy, completeness, reliability, or adequacy of these data and expressly disclaims liability for errors and omissions in these data. No warranty of any kind, implied, expressed, or statutory, including but not limited to the warranties of non-infringement of third party rights, title, merchantability, fitness for a particular purpose, and freedom from computer virus, is given with respect to these data. California Department of Fish and Wildlife, Region 6 Samantha Przeklasa, née Haynes Environmental Scientist - Salton Sea Program (760) 200-9371 Samantha.Przeklasa@Wildlife.ca.gov California Department of Fish and Wildlife, Region 6 Samantha Przeklasa, née Haynes Environmental Scientist - Salton Sea Program (760) 200-9371 Samantha.Przeklasa@Wildlife.ca.gov None Unclassified None Version 6.2 (Build 9200) ; Esri ArcGIS 10.6.1.9270 The data fields have been filled in such that attribute accuracy is considered to be 100%, which has been manually verified in ArcMap. The data is complete, and was checked for topological consistency using the ArcInfo command CLEAN, and the linework was verified using the ArcInfo command BUILD using the LINE option. The dataset was generalized from the contours initially generated from the sounding point data provided using a weed tolerance of twentyfive meters and a degree of triangular subdivision of five for contour smoothing. Estimated to be +/- five feet. Original bathymetric sounding points were used to generate a TIN model, which was then clipped to the boundary (shoreline) of the Salton Sea. Bathymetric isolines (contours) were then generated using the TINCONTOUR command, and the resulting coverage was editing in ARCEDIT to eliminate overlaps in the contours, and "spike" errors which extended shoreward onto land from the Sea. The linework was assigned attributes and run through standard quality assurance measures. Redlands Institute, University of Redlands Kenneth C. Althiser Senior GIS Analyst mailing and physical

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Redlands CA 92373 US 909-335-5268 909-307-6952 Vector String 905 NAD 1983 California Teale Albers 34.0 40.5 -120.0 0.0 0.0 -4000000.0 coordinate pair 0.0001 0.0001 meter D North American 1983 GRS 1980 6378137.0 298.257222101 ds386 INDEX Identifies if feature is an index contour or not. OBJECTID Internal feature number. Esri Sequential unique whole numbers that are automatically generated. FNODE_ Shape Feature geometry. ESRI Coordinates defining the features. LENGTH Length of feature in internal units. ESRI Positive real numbers that are automatically generated. CONTOUR Elevation in Meters Relative to Mean Sea Level (Integer). SHORE Indicates whether a given feature is part of the current shoreline. TNODE_ ELEVATION Elevation in Meters from Mean Sea Level (floating point decimal). LPOLY_ RPOLY_ BATH_CONT5 BATH_CON_1 Shape_Length Length of feature in internal units. Esri Positive real numbers that are automatically generated. 20240315 California Department of Fish and Wildlife, Region 6 Samantha Przeklasa, née Haynes Environmental Scientist - Salton Sea Program (760) 200-9371 Samantha.Przeklasa@Wildlife.ca.gov FGDC Content Standard for Digital Geospatial Metadata FGDC-STD-001-1998 local time None Unclassified None