Version history for Bathymetric change analysis in San Francisco Bay, California, from 1971 to 2020  

(formerly cited as) Fregoso, T.A., Jaffe, B.E., and Foxgrover, A.C., 2023, Bathymetric change analysis in San Francisco Bay, California, from 1971 to 2020: U.S. Geological Survey data release, https://doi.org/10.5066/P9Y5PEV0.
(now cited as) Fregoso, T.A., Jaffe, B.E., and Foxgrover, A.C., 2024, Bathymetric change analysis in San Francisco Bay, California, from 1971 to 2020: U.S. Geological Survey data release, https://doi.org/10.5066/P1332UUW.

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Version 1.0 posted online April 5, 2023
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Version 2.0 revised and reposted online July 2024

Changes in version 2.0:

CENTRAL BAY:
Edits were made to CentralBay_Bathychange_1971_2020_25m.tif to correct the grid bias adjustment. 
A grid bias correction of 5.4 cm was added to account for this correction being accidentally omitted from
the 1980s DEM used to create the original difference DEM. As a result, the original geoTIFF mistakenly underestimated 
deposition (positive values) and overestimated erosion (negative values) by a static offset of 5.4 cm. Within the Central Bay 
metadata, the Attribute Range Domain minimum and maximum values were corrected to reflect this 5.4 cm shift. 

CENTRAL, SAN PABLO, SUISUN, AND SOUTH BAY:
Edits were made to the geoTIFF’s internal projection assignment. Although the horizontal datum and projection information were correctly 
defined as NAD83(2011) / UTM Zone 10 within the version 1.0 metadata files, the Geographic Coordinate System (GCS) and associated DATUM 
definition description stored internally, within the GeoTIFF itself, was incorrect. The originally assigned GCS was corrected from GCS_GRS_1980 
to NAD 1983 (2011) and the projected coordinate system (PCS) from GRS_1980_UTM_Zone_10N to NAD 1983 (2011) UTM Zone 10N. 
Please note that the coordinate values and position of the GeoTIFF pixels did not change, only the projection definition.

Data values were not changed in the South, Suisun, or San Pablo Bay GeoTIFFs.

Prior versions are archived at https://cmgds.marine.usgs.gov/data/pcmsc/data-release/revision-archive/doi_P9Y5PEV0/  

METADATA:
1. The last two sentences of the abstract were edited to clarify that a grid interpolation bias and tidal datum correction was applied prior to 
generating the bathymetric change grids.

2. Altitude Datum Name, previously listed as Mean Lower Low Water (MLLW), was removed. Although the input bathymetric DEMs are both referenced to MLLW, 
the change grid represents relative change between the two time periods and is not directly referenced to MLLW.
This clarification was also applied to the Entity Type and Attribute Definition fields. 

3. Online linkages, DOI number, and file names were updated in the metadata. Edition text added: version 2.0