D-3 
MClRTF 
CB1TF 
8 SHO H 
GUNOH. 
LK'OH 
POTTF 
.IMSTF 
apptf 
POCTF 
ELIMH 
LYMPH 
S B EM H 
Figure D-1. Chesapeake Bay Program 1998 segmentation design. 
and tributary interpolator. Other .bth files have also been created for individual river 
systems. Users that need specialized processing, such as finer resolution or addi¬ 
tional segments in a particular area of interest, must create a new bathymetry file that 
defines the bathymetry of the area of interest at the desire cell-size. 
Regions filters (cbay8.drg, bay_trib.drg, etc) are files which contain a closed 
polygon of x-y points that define an area larger than the corresponding * .bth file. The 
region file identifies the geographic boundary that limits which monitoring station 
data are included in interpolation for a given segment. The purpose of the data region 
is to select a subset of the monitoring data from the input data file, and to then use 
appendix d 
User Guide and Documentation for the Chesapeake Bay Interpolator 
