Bathymetry and Acoustic Backscatter—Estero Bay, California

Figures

Figure 1. (0.5 MB)
Location map of the outer Estero Bay, California, with the 2012 U.S. Geological Survey bathymetry. The extent 4 m grid is shown in red, and the 2 m grid is shown in green. The coregistered backscatter data area is the same as the displayed bathymetry. GPS base stations used for geodetic control are shown as green dots. The base map for the inset was accessed through ArcGIS Online, and is available at http://services.arcgisonline.com/ArcGIS/services/
Figure 2. (0.04 MB)
Photograph of the U.S. Geological Survey R/V Parke Snavely.
Figure 3. (0.05 MB)
Fore and aft photographs of the SWATHplus sonar pole mount on the R/V Parke Snavely. Note that the sonar shown is not the Seabat 7111, but the same pole was used to mount the Seabat.
Figure 4. (0.12 MB)
Processing workflow diagram for converting soundings to a Digital Elevation Model (DEM).
Figure 5. (0.04 MB)
Plan view of Estero Bay, California, bathymetry in shaded relief. The base map was accessed through ArcGIS Online, and is available at http://services.arcgisonline.com/ArcGIS/services/
Figure 6. (0.04 MB)
Normalized backscatter amplitude image of Estero Bay, California. The base map was accessed through ArcGIS Online, and is available at http://services.arcgisonline.com/ArcGIS/services/
Figure 7. (0.05 MB)
Estimated vertical uncertainty of elevation values in the Estero Bay, California, survey dataset. The vertical uncertainty is defined as 1.96 times the standard deviation of soundings within a cell. The higher vertical uncertainty observed in the northwest section of the survey results from the greater water depth in that region. The base map was accessed through ArcGIS Online, and is available at http://services.arcgisonline.com/ArcGIS/services/
Figure 8. (0.05 MB)
Histogram of cell standard deviations in the Estero Bay, California, survey area.
Figure 9. (0.14 MB)
Uncertainty in sounding elevation for the Estero Bay, California, survey as a function of water depth, with International Hydrographic Organization (IHO) standards shown for comparison. Sounding uncertainty is calculated as 1.96 times the standard deviation of sounding elevations in a 2 by 2 m grid for depths less than 100 m and in a 4 by 4 m grid for depths greater than 100 m. The spike at 100 m depth is due to the change in cell size across the merged grid. For clarity, only about 0.1 percent of the dataset (200,000 randomly selected points) is shown. The large number of cells with a total vertical uncertainty (TVU) of 0 is the result of rounding down the values in cells where the TVU is close to 0. The maximum vertical uncertainty allowed for each IHO survey order is indicated by the red lines (dashed where projected to depths greater than intended). The 10-period moving average vertical uncertainty of the dataset is shown in cyan.
Figure 10. (0.33 MB)
Bathymetric uncertainty (95-percent confidence) classified by minimum International Hydrographic Organization (IHO) Survey Standards. Most cells fall within the vertical uncertainty limits for IHO special order. The base map was accessed through ArcGIS Online, and is available at http://services.arcgisonline.com/ArcGIS/services/

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