• LEAN-Corrected San Francisco Bay Digital Elevation Model, 2018

    Metadata Updated: August 16, 2020

    Lidar-derived digital elevation models often contain a vertical bias due to vegetation. In areas with tidal influence the amount of bias can be ecologically significant, for example, by decreasing the expected inundation frequency. We generated a corrected digital elevation mode (DEM) for tidal marsh areas around San Francisco Bay using the Lidar Elevation Adjustment with NDVI (LEAN) technique (Buffington et al. 2016). Survey-grade GPS survey data (6614 points), NAIP-derived Normalized Difference Vegetation Index, and original 1 m lidar DEM from 2010 were used to generate a model of predicted bias across tidal marsh areas. The predicted bias was then subtracted from the original lidar DEM and merged with the NOAA Sea-Level Rise Viewer DEM to create a new seamless DEM for the San Francisco Bay. Across all GPS points, mean initial lidar error was 22.8 cm (SD=12.0) and root-mean squared error (RMSE) was 25.8 cm. After correction with LEAN, mean error was 0 (SD=0.07) and RMSE was 7.4 cm. References: Buffington, K.J., Dugger, B.D., Thorne, K.M. and Takekawa, J.Y., 2016. Statistical correction of lidar-derived digital elevation models with multispectral airborne imagery in tidal marshes. Remote Sensing of Environment, 186, pp.616-625.

    Access & Use Information

    License: No license information was provided.

    Downloads & Resources

    Dates

    Metadata Date August 2, 2018
    Metadata Created Date August 16, 2020
    Metadata Updated Date August 16, 2020
    Reference Date(s) January 1, 2019 (publication)
    Frequency Of Update notPlanned

    Metadata Source

    Harvested from USGS-Harvest

    Additional Metadata

    Resource Type Dataset
    Metadata Date August 2, 2018
    Metadata Created Date August 16, 2020
    Metadata Updated Date August 16, 2020
    Reference Date(s) January 1, 2019 (publication)
    Responsible Party U.S. Geological Survey, Western Ecological Research Center (Point of Contact)
    Contact Email
    Access Constraints Use Constraints: Users are advised to read the data set's metadata thoroughly to understand appropriate use and data limitations., Access Constraints: None. Please see 'Distribution Info' for details.
    Bbox East Long -121.8443
    Bbox North Lat 38.3689
    Bbox South Lat 37.3322
    Bbox West Long -122.7384
    Coupled Resource
    Frequency Of Update notPlanned
    Guid
    Harvest Object Id 8fbe7a19-a56e-4dfa-b112-35667dcaa91e
    Harvest Source Id 00f54869-3a43-480d-a67c-0ba115f5d739
    Harvest Source Title USGS-Harvest
    Licence Unless otherwise stated, all data, metadata and related materials are considered to satisfy the quality standards relative to the purpose for which the data were collected. Although these data and associated metadata have been reviewed for accuracy and completeness and approved for release by the U.S. Geological Survey (USGS), no warranty expressed or implied is made regarding the display or utility of the data on any other system or for general or scientific purposes, nor shall the act of distribution constitute any such warranty.
    Metadata Language
    Metadata Type geospatial
    Progress completed
    Spatial Data Service Type
    Spatial Reference System
    Spatial Harvester True
    Temporal Extent Begin 2009-06-01
    Temporal Extent End 2018-02-01

    Didn't find what you're looking for? Suggest a dataset here.