This is a Non-Federal dataset covered by different Terms of Use than Data.gov.

Eureka Littoral Cell CRSMP Humboldt Bay Mean Monthly Maximum Water Elevation 2011

Metadata Updated: April 9, 2015

The Humboldt Bay Shoreline Assessment and LiDAR Analysis was conducted by field mapping the entire shoreline and assigning an unique segment identifier based on a change in attributes of type, structure, cover, and salt marsh adjacency onto 11x17 aerial photo base maps at a scale of 1” = 200’. Once field mapped shoreline segments were digitized and attributed in GIS. In early 2012 the NOAA Coastal LiDAR dataset became available as a “hydro-flattened bare earth” digital elevation model (DEM). Metadata provided with the DEM reported a vertical accuracy RMSE less than or equal to 18 cm and a horizontal accuracy of 50 cm RMSE or better. A subset of the LiDAR DEM was taken that included all portions of the Humboldt Bay shoreline. A contour layer was derived from the DEM and the DEM was color coded in 0.5 meter elevation increments. Digitized artificial shoreline segments were realigned with the contours and color coded DEM to ensure that the segments were aligned with the structures which they represent. Jeff Anderson of Northern Hydrology prepared a DEM of Humboldt Bay representing water surface elevations of the present day mean monthly maximum water surface (MMMW). The MMMW surface was subtracted from the LiDAR DEM to produce a third DEM of relative elevations to the MMMW. These relative elevations were assigned to the shoreline segments at one meter spacing as the DEM is comprised of a one meter pixel resolution. The 1 meter spaced vertices of the shoreline segments were exported to a 3D point feature class. The shoreline segments were then broken at each vertex to produce 169,903 1 meter shoreline segments which all contained the original unique segment identifier, shoreline attributes, and start and end relative elevation values in the attribute table. An average relative elevation was calculated for each one meter shoreline segment and used as the basis for analysis.

Access & Use Information

Non-Federal: This dataset is covered by different Terms of Use than Data.gov. License: No license information was provided.

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Dates

Metadata Date January 1, 9999
Metadata Created Date March 14, 2013
Metadata Updated Date April 9, 2015
Reference Date(s) January 1, 9999 (publication)
Frequency Of Update notPlanned

Metadata Source

Harvested from California Environmental Information Catalog

Additional Metadata

Resource Type Dataset
Metadata Date January 1, 9999
Metadata Created Date March 14, 2013
Metadata Updated Date April 9, 2015
Reference Date(s) January 1, 9999 (publication)
Responsible Party (Point of Contact)
Contact Email
Access Constraints Use Constraints:, Access Constraints:
Bbox East Long -124.079226
Bbox North Lat 40.912719
Bbox South Lat 40.674732
Bbox West Long -124.271834
Coupled Resource
Frequency Of Update notPlanned
Guid
Harvest Object Id 10617d38-e212-4144-b4ab-828231f931d1
Harvest Source Id ac9a5a12-0348-49fc-ac7a-cc3aee201b04
Harvest Source Title California Environmental Information Catalog
Licence
Metadata Language
Metadata Type geospatial
Spatial Data Service Type
Spatial Reference System

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