COMPRESSED AERONAUTICAL CHART PROCESSING OPERATOR

19 June 2001

Source: http://postoffice.nrlssc.navy.mil/abstract%2057.htm

COMPRESSED AERONAUTICAL CHART PROCESSING OPERATOR'S MANUAL

S. Myrick    M. Lohrenz
P. Wischow    M. Gendron
Naval Research Laboratory
Stennis Space Center, MS 39529-5004
J. M. Mehaffey     L. Riedlinger
Planning Systems Incorporated
Slidell, LA 70458

Abstract

The Naval Research Laboratory (NRL) Map Data Formatting Facility (MDFF) has developed an efficient data processing system that compresses Defense Mapping Agency (DMA) Arc Digitized Raster Graphics (ADRG) data into the Navy-specified Compressed Aeronautical Chart (CAC) database. Much of the software in this system was originally developed by Honeywell, Inc., under contract to McDonnell Douglas Aircraft Co., as part of an airtask with the AV-8B program office at the Naval Air Systems Command (NAVAIR). Since Fiscal Year (FY) 1990, programmers at the NRL MDFF have made significant modifications and enhancements to the original system, which has considerably accelerated the production of the CAC database (Lohrenz, et al, 19__).

This document describes the MDFF CAC processing software from the perspective of an operator who will be processing source ADRG data into CAC data installments. Following the introduction section, this report presents an overview of CAC processing, including a list of acronyms and a brief description of each of the five main CAC processing phases. Next, a section on Operations and Maintenance describes the basic computer system operations with which a CAC processing operator must be familiar. Included in this section are symbol and logical name definitions, directory and file structures, queue management, and related topics. The next five sections detail each phase of CAC processing: INITIALIZATION, PASS 1, PASS2, PASS3, WRAP-UP, and ISO-BUILD. A section on premastering ("ISO Processing") and a Summary follows. A glossary of CAC-specific terminology is provided at the end of the report.