SYMPOSIUM MINISYMPOSIA

MINISYMPOSIUM ABSTRACT

Within the Geospatial Information Database (GIDB), a digital mapping program produced by the Digital Mapping, Charting and Geodesy Analysis Program (DMAP) of the Naval Research Laboratory, spatial data is stored in an object-oriented dat abase. Representing this data on a digital map presents several challenges, incl uding the task of applying a symbological scheme. Since the GIDB project utilize s the National Imagery and Mapping Agency's vector product format, NIMA's VPF sy mbology product, Geosym, was used.

The implementation of symbology involved interpreting over 700 vector images and converting a relational table with 2900 entries. A major component of this p roject was developing a scheme to translate the relational symbol table into an object-oriented format with which the mapping application could interact. The ap plication database contains point, area, and line features in the VPF format. Th ese features each have an appropriate symbol or group of symbols for which to be symbolized. To accomplish this t ask the symbology scheme was required to accept any feature and return the corre ct symbology. This scheme will be discussed in detail along with several other i ssues raised in converting the existing symbology product into object-oriented f ormat.

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