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Data File Creation Tool 
CHESAPEAKE BAY PROGRAM INTERPOLATOR 
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Figure D-2. Screen 1 includes seven navigation buttons and the Data 
File Creation Tool for importing data from an ACCESS data base and 
creating VOL3D data files.Once the user has selected the desired data 
fields in the data table (Figure D-3), the Data File Creation Tool opens a 
new screen that provides a range of options to the user for selecting 
and subsetting data from the ACCESS data table (Figure D-4). The Data 
Engine allows the user to select data by parameter, by date range, to 
set interpolation control parameters, to choose the desired bathymetry, 
to select data by depth ranges or layers, and finally to choose how the 
group the resulting data in one or more output files. The "Create Files" 
button, when pushed, will generate data files in the VOL3D ".d3d" file 
format. These files are then ready for interpolation. 
that subset for computing the values for each cell in a segment. Use of data regions 
ensures that the interpolator does not “reach across land” to obtain data from an adja¬ 
cent river which would give erroneous results. By using data regions, each segment 
of cells can be computed from their individual subset of monitoring data. Each adja¬ 
cent data region should overlap by some amount so that there is a continuous 
gradient, and not a seam, across segment boundaries. 
In the future, a pycnocline filter may be added to the Interpolator, so that water 
above, within, and below the pycnocline are not interpolated together. Since the 
water quality in various parts of the pycnocline can be so dramatically different, the 
Interpolator file structure will be modified to handle this requirement. 
INSTALLATION 
The Vol3D Interpolator code and auxiliary files have been bundled together into a 
SETUP application and then PKZipped to reduce the overall file size. The Vol3D.zip 
file must first be unzipped into a directory on any standard PC running the Windows 
appendix d 
User Guide and Documentation for the Chesapeake Bay Interpolator 
