the left side of the screen comprise the Table of Contents of the viewable data 

 shown in the frame to the right. 



'■f,lft'/M.M'ffWWm 



Os £A &w» Item £ufece Gratia ^nfev* Hsip 



M ffl s^m BKE1 



* 1 9S 5 -shore line .d'.vg — 



SHORELINE 

 «< Jetties .shp 



** Channel .dwg 



/\/ CENTER-LINE 

 '/V DISPOSAL 

 DREDGING 

 /\/ DREDGING-C HANI 

 STATIONS 

 *i 1985 TIN 

 Elevation Range 

 1-4.111-1.2 

 I 1-9.422-^.111 

 "Z3 -14.733 - -9422 

 3] -20.044 - -14.733 

 S -25.356 - -20.044 



■ -30.567 - -25.356 

 II -35.978 - -30.667 



■ -41.289 --35.978 

 H -46.6 --41 .289 



V USGS Quad.jpg 



1985.txl 

 . -46.6 - -32.1 



• -32.1- -23.6 



• -23.6 - -18.1 



• -18.1- -14.3 



Figure 6. Example of data formats available in the DMS-Data Manager 



This example illustrates some of the usable data formats in the Data 

 Manager. First, a georeferenced image of a U.S. Geological Survey (USGS) 

 7.5-min quadrangle (labeled USGS Quad.jpg) provides the underlying base map. 

 An AutoCad drawing (Chcmnel.dwg) of the authorized channel and disposal sites 

 has been layered on top of the base map. Above the CAD drawing, the east and 

 west jetties are shown as an Arc View shapefile {Jetties, shp). Point data from a 

 comma-delimited X,Y,Z ASCII file (1985.txt) were loaded into the project but 

 not displayed. However, the point data were used to create a triangulated 

 irregular network (TIN) to represent the surface defined by a 1985 bathymetric 

 survey. The TIN has been color coded based on the given elevations to illustrate 

 depths within East Pass. As this single screen shot shows, multiple data formats 

 can now be brought together to provide a detailed view of a project. 



With the data assembled in one place, the user can first make some simple 

 observations. First, areas of persistent shoaling become easy to identify. 

 Although personnel with extensive experience on a given project are likely 

 familiar with such areas, documentation in a graphical format helps to clarify and 

 quantify the problem. Figure 7 shows data from bathymetric surveys of East 

 Pass in 1985, 1990, and 1997. Each of these surveys covers areas outside the 

 authorized channels. For clarity, the data have been filtered to display only those 

 falling within the authorized channels. The first two surveys involved standard 



Chapter 2 DMS-Data Manager 



19 



