4 Inventory of Available Data
and Data Sources
The review of available data is presented in four parts. In the first three
sections of this chapter, aerial photographs, maps and charts, and studies and
reports are described. A short narrative description of the material and
identification of the key material are presented. Detailed listings of the
information are provided in the referenced appendices. The fourth and last
section describes and discusses a variety of data sources that provide contact
information necessary for the entrance study, or that may be of more general
interest to investigators studying the Humboldt Bay entrance. The final section
also contains contact information for the primary and secondary sources for the
data presented.
Aerial Photographs
Appendix A, in 12 tabloid-size pages, contains a list of aerial and ground
photographs found during the data search for the "Humboldt Bay Entrance Study
Data Review." Appendix B contains tables indicating the abbreviations used
for the origin and primary and secondary sources of the photographs (Table B1),
the photograph format codes (Table B2), the photograph type codes (Table B3)
and the photograph location codes (Table B4) found in the listing. In all cases
where the time the aerial photograph (column 3) at the Humboldt Bay Entrance
could be determined, the corresponding tidal height and tidal condition is noted
in Column 4 of the Photograph Table Appendix A. The time of the Humboldt
Bay entrance aerial photograph was determined from the time printed on the
photograph, if available. In most cases, the time of the entrance photograph was
calculated based on the start and end time of the flight track. Corresponding tidal
height and condition were determined from NOAA/NOS records using the
Nautical Software Inc. 1993-1995 program, Tides and Currents for Windows,
Version 2.0.
The predominant emphasis in preparing this listing was on aerial
photographs rather than on ground photographs, as the study emphasis is on
understanding the dynamics of the Humboldt Bay entrance rather than on the
Humboldt Bay history or on the engineering history of the jetty construction and
maintenance. There are sources of historical ground photographs of Humboldt
Bay located in Humboldt County that are beyond the scope of this data review.
Aerial photographs determined to be of significance to the study were scanned by
an HP ScanJet 5200C, with a resolution of 150 dots per inch (dpi). The scanned
aerials files, as *.bmp files, have been transmitted to the CIRP.
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Chapter 4 Inventory of Available Data and Data Sources
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