An Interactive Graphics System for the Reduction of Airborne Laser Profiles of Sea Ice.

• Main Authors: Holyer,I J J, Wadhams,Peter, Lowry,R T
• Other Authors: SCOTT POLAR RESEARCH INST CAMBRIDGE (ENGLAND)
• Format: Text
• Language: English
• Published: 1977
• Subjects: Snow; Ice and Permafrost; Computer Programming and Software; *INTERACTIVE GRAPHICS; *SEA ICE; CANADA; SURFACE ROUGHNESS; PROFILOMETERS; PROFILES; REMOTE DETECTORS; DATA REDUCTION; MAN COMPUTER INTERFACE; SUBROUTINES; HELIUM NEON LASERS; Canada; Ice; permafrost; Sea ice
• Online Access: http://www.dtic.mil/docs/citations/ADA057464; http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=ADA057464

The authors have developed an interactive graphics system for the correction and reduction of airborne laser profiles of sea ice. The system is implemented on a Vector General Renewable display system connected to a PDP11/45 computer, but minor modifications would make it suitable for any computer with interactive graphics. The laser profile is displayed in sections and the human operator is armed with routines for the removal of noise spikes, phase jumps and aircraft altitude variations. Completely automatic profile correction techniques have been found to be inadequate or unworkable, especially in heavily ridged ice. Although designed specifically to treat the output of the Geodolite laser profilometer, the system can be applied to many other data correction problems in geophysics and other sciences where long time series of data are obtained with periodic noise spikes or a long-period drift or modulation which requires removal. (Author)