Imaging radar observations of Askja Caldera, Iceland

• Main Authors: Malin, M. C., Evans, D., Elachi, C.
• Format: Other/Unknown Material
• Language: unknown
• Published: 1978
• Subjects: 43; Askja; Iceland
• Online Access: http://ntrs.nasa.gov/search.jsp?R=19790030631

A 'blind' test involving interpretation of computer-enhanced like- and cross-polarized radar images is used to evaluate the surface roughness of Askja Caldera, a large volcanic complex in central Iceland. The 'blind' test differs from earlier analyses of radar observations in that computer-processes images and both qualitative and quantitative analyses are used. Attention is given to photogeologic examination and subsequent survey-type field observations, along with aerial photography during the field trip. The results indicate that the 'blind' test of radar interpretation of the Askja volcanic area can be considered suitable within the framework of limitations of radar data considered explicitly from the onset. The limitations of the radar techniques can be eliminated by using oblique-viewing conditions to remove geometric distortions and slope effects.