Accession Number:

ADA059942

Title:

Toward Automatic Extraction of Cartographic Features.

Descriptive Note:

Final rept.,

Corporate Author:

L N K CORP SILVER SPRING MD

Personal Author(s):

Report Date:

1978-07-01

Pagination or Media Count:

129.0

Abstract:

The problem of automatically extracting map symbology from source imagery is studied. It is concluded that a great deal of geographic knowledge used by humans, who currently perform this extraction function, must be made available to machines before the function can be automated. Several geographic knowledge sources are discussed and an attempt is made to define paradigms under which knowledge can be encoded and used in the computer. An automatic cartographic feature extraction system ACES is sketched which represents a best framework for continuing development on this difficult problem given current achievements. A systems approach is taken with first consideration given to desired outputs and available inputs. It is concluded that inputoutput technology is far in advance of technology available for interpretation of the data. Emphasis is placed on the use of knowledge by ACES during automatic interpretation of imagery. Many types of knowledge typically used by humans appear difficult to engineer into automatic processes. Use of positional knowledge encoded in a geographic data base GDB is selected as the most promising avenue. Proposals are given for future research work in that direction. Author

Subject Categories:

  • Cartography and Aerial Photography

Distribution Statement:

APPROVED FOR PUBLIC RELEASE