operating systems is not scheduled at this time. The Data Manager extension will 

 incorporate ESRI's 3-D Analyst extension to develop and view bathymetric 

 surfaces and to calculate sediment volumes. The 3-D Analyst, which is not 

 necessary to view much of the base map data, is a central element of the DMS- 

 Data Manager. The CAD Viewer extension, provided with the base ArcView 

 package, allows incorporation of CAD drawings in AutoCad (.dwg), AutoCad 

 export (dxf), and MicroStation (.dgn) formats within the database. Additionally, 

 the latest version of the software supports many common image formats, 

 allowing easy viewing of existing and historic site conditions. Finally, the Data 

 Manager accesses the Crystal Reports for ArcView application to generate many 

 of the available professional reports. 



Data requirements 



The Data Manager supports a wide variety of data formats. These include 

 Arc/Info coverages, shapefiles (Arc View's native format), AutoCad drawings 

 (through release 14), MicroStation files, Dbase databases, various text-based data 

 files, and digital images. The initial step required during development of the 

 database is selection of a common coordinate system (typically State Plane or 

 UTM) and units (feet, meters, decimal degrees) to be applied to all the data. This 

 flexibility provides a common reference for the Data Manager and allows 

 accurate data layering. The required data falls into five classifications: base map 

 information, bathymetric surveys, dredging records, digitized photographs, and 

 miscellaneous. Each classification is discussed in detail below. 



Base map 



Base map information can be anything the user associates readily with the 

 project area. Examples include project (channel) boundaries, stationing 

 information, aids to navigation, shoreline positions, shore-protection structures, 

 marina and port facilities, sensitive environmental areas, deposition areas, 

 hazardous areas, shipwrecks, fish havens, reefs, utilities, buildings, roads, and 

 bridges. Typical formats for base map data will include Arc/Info coverages, 

 shapefiles, or the two CAD formats. The World Wide Web and in-house GIS 

 personnel provide numerous sources for base map data from various Federal, 

 State, and local Government agencies. 



Bathymetric surveys 



The Data Manager accesses standard bathymetric survey data to develop 

 surfaces and grids representing the bathymetry in and around the project area. 

 These data will typically be available in ASCII text files (X, Y, Z) or as contour 

 lines in a CAD drawing. A bathymetry wizard leads the user step by step 

 through the surface-generation process. 



Dredging records 



Historical dredging records are documented in native ArcView database 

 format and accessed with standard queries through a wizard interface. 



Chapter 2 DMS-Data Manager 1 7 



