|Interactive Topographic Analysis System (ITAS)|
The Interactive Topographic Analysis System (ITAS) was developed to facilitate the analysis and visualization of topographic and related data sets. The primary data sets used to develop ITAS were TOPSAR topography and radar backscatter. TOPSAR is an airborne radar system that is described by Zebker et al. (1992) and Evans et al. (1993).
The ITAS software features a graphical user interface and online help which allows a user to quickly enhance and extract relevant statistics based on polygons or profiles drawn by the user. For volcanology applications, this might include the thickness of lava flows as a function of slope, radar backscatter vs. slope, the cross-sectional area of pyroclastic flow channels as a function of distance from the rim of a volcano, or the spatial distribution and volume of parasitic cinder cones. Further examples of using the ITAS package on TOPSAR data for Vesuvius are given in Mouginis-Mark and Garbeil (1993).
The user must supply a data set which minimally must consist of a digital elevation model (DEM). For better navigating within the image, a shaded relief, radar backscatter, or reflectance map should also be used. The user has the option of working off the DEM, slope map, shaded relief image, or some other coregistered data sets (such as SPOT or Landsat). All images (or layers) must be coregistered.
Evans DL, C Elachi, ER Stofan, B Holt, JB Way, M Kobrick, H Ottl, P Pampaloni, M Vogt, S Wall, J van Zyl, and M Schier (1993). The Shuttle Imaging Radar-C and X-SAR mission. Eos Trans. AGU, 74: p. 145, 157, 158.
Mouginis-Mark, PJ and H Garbeil (1993). Digital topography of volcanoes from radar interferometry: An example from Mt. Vesuvius, Italy. Bull. Volcanol., 55: 566-570.
Zebker, HA, SN Madsen, J Martin, KB Wheeler, T Miller, Y Lou, G Alberti, S Vetrella, and A Cucci (1992). The TOPSAR interferometric radar topographic mapping instrument. IEEE Trans. Geosci. Remote Sens., 30: 933-940.
Download ITAS (University of Hawai'i web server)
Two files are required: