D-29 
1, Dissolved Oxygen.DO, 1 
2, Chlorophyll,CH.l 
3,Salinity ,SA,1 
4, Water Temperature.WT, 1 
5, Total Nitrogen.TN,2 
6, Ammonia,NH,3 
7, Nitrite.N2,3 
8, Nitrate,N3,3 
9, Total Phosphorus,TP,2 
PARAMETER RANGE FILES (.rng) 
Several files are required to compute report files of volume and mass and to graphi¬ 
cally portray the interpolated results. These include: 
1) the “filename”.est file of estimated values; 
2) the cbpotiny.bmp which is a small CBP logo file; 
3) the aro.bmp which is a small north arrow; 
4) shore_18.bnd which is a shoreline boundary file; and, 
5) the “parameter_code”.mg file. The range file is used by the volume and mass 
report procedures to subset the computed results into categories for reporting. For 
graphics, the .mg file defines how the graphics program assigns colors to each cell 
value in the “filename”.est file. For drawing purposes, the first range in the .mg table 
has drawing priority over the second range, which has priority over the third range, 
etc, so the first range color will paint over ranges lower in the table. This order deter¬ 
mines which colors have priority in the final graphic. The do.mg file serves as an 
example: 
Line l>For dissolved oxygen values of 0.0 to but less than 0.2, color 12, pattern 0, title 0.0-0.2 
Line 2>For dissolved oxygen values of 0.2 to but less than 1.0, color 13. pattern 2, title 0.2-1.0 
Line 3>For dissolved oxygen values of 1.0 to but less than 3.0, color 14, pattern 12, title 1.0-3.0 
Line 4>For dissolved oxygen values of 3.0 to but less than 5.0, color 11, pattern 12, title 3.0-5.0 
Line 5>For dissolved oxygen values of 5.0 to but less than 25.0, color 19, pattern 21, title >5.0 MG/L 
Line 6>For dissolved oxygen values of -10.0 to but less than -8.0 (-9=missing value), color 8, pattern 
8, title Not Calculated 
Pattern is currently ignored in this version. 
To categorize integer value ranges, it is best to bracket the range, for instance, to 
assign color 12 to the range of 2 (lower bound) to 2 (upper bound), set the lower 
bound to 1.9 and the upper bound to 2.1. Set the title to “2” to convey the intent that 
“2” is the range being presented. This bracketing is required to allow the code to 
select values equal to or greater than the lower bound and less than the upper bound. 
appendix d • User Guide and Documentation for the Chesapeake Bay Interpolator 
