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Figure D-18. Min-Max screen to 
capture the minimum oxygen 
values in each cell over the July- 
September timeframe in 1997. The 
bdo-9707-9709.fls file contains file 
names of interpolated dissolved 
oxygen .EST files. The Temp file is 
an intermediate working file that 
can be deleted after the job is com¬ 
pleted. In this example, a new .EST 
file - do-minimum.est - is created 
which contains the minimum vale 
for each cell over the time interval 
of the bdo-9707-9709.fls file. In 
this example, "Ignore missing 
values" has been selected. 
Geography 
Data Import 
interpolate 
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Math 
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Figure D-19. Math screen with files 
chosen to "Change Over Time". The 
do97.fls file contains file names of 
dissolved oxygen .EST files. The 
corresponding Julian dates for 
these .EST files are read from the 
do.97.jul file. In this example, a 
new .EST file - dope.est - is created 
which contains the linear trend for 
each cell over the time interval of 
the do97.fls file. The dope.est cell 
values are percentage change over 
time, categorized by the selection 
criteria identified 
appendix d 
User Guido and Documentation for the Chesapeake Bay Interpolator 
