From: hogrefek@geo.oregonstate.edu
Date: December 3, 2008 4:52:14 PM PST
To: Joyce Miller <Joyce.Miller@noaa.gov>
Cc: John Rooney <John.Rooney@noaa.gov>, Jonathan Weiss <jweiss@soest.hawaii.edu>, Darryl.Tagami@noaa.gov, Scott.Ferguson@noaa.gov, "Dawn, Deepsea" <dawn@dusk.geo.orst.edu>
Subject: Ofu-Olosega Update

...As previously mentioned the new product uses an additional image that I found buried in the files that Tim sent resulting in a significant increase in coverage. The second change is the innovation that I mentioned in the e-mail of 11/26 - a rather simple idea, but the results are quite exciting (if you're into this sort of thing). For each image I mosaiced derived bathy resulting from the original MLR variables, which always has the best stats, with derived bathy resulting from variables changed in order to increase spatial coverage in shallow areas. When you have time to get to the error analysis, please note that the statistical accuracy of the mosaiced product actually improves over that of either original product. I believe the improvement is because this method allows us to work around our dirth of control (multibeam or other) data in very shallow water.

I used a similar methodology for the Tau deliverable posted last week and will continue with it for future products, unless a good reason not to comes up.

In the [zip file] you will find:

1 MS Word files:
Error Analysis

3 ESRI Grid files (in their own folder):
oo_dball_mos3: final mosaic of 4 derived bathy products from two images. oo_dbmb_mos4: mosaic of the DB mosaic and the multibeam sonar grid.
oo_dball_err: error grid, Error = Sonar depth - derived depth

2 Metadata files for oo_dball_mos3 and oo_dbmb_mos4.

10 PDF files:
OO_01_DB: Image OO-01, product DB - derived with original MLR variables.
OO_01_DB2: Image OO-01, product DB2 - derived with reduced Y-intercept.
OO_01_DBDB2_Mosaic: Image OO-01 mosaic - Data from DB given priority.
OO_04_DB: Image OO-04, product DB - derived with original MLR variables.
OO_04_DB5: Image OO-04, product DB5 - derived with reduced Slope values.
OO_04_DBDB5_Mosaic: Image OO-04 mosaic - Data from DB given priority.
OO_DBAll_Mosaic: Mosaic of the mosaic from both images (oo_dball_mos3)
OO_DBMB_Mosaic: Mosaic of derived and multibeam bathy (oo_dbmb_mos4)
OO_DBAll_MosaicError: Error grid (oo_dball_err)
OO_DB_AddCoverage: Basically the DBMB mosaic with the derived bathy highlighted

Sorry if this number of maps seems excessive, my intent was to provide a snapshot of each derived bathy product that culminated in the final mosaic for reference while reading the error analysis....