RED RELIEF IMAGE MAP: NEW VISUALIZATION METHOD FOR THREE DIMENSIONAL DATA

摘要

The vast increase of the volume of three dimensional topographic data acquired by Airborne LIDAR extends the possibility of the visualization method. The maximum laser pulse frequency of modern LIDAR system has reached more than 250 kHz. In addition to such high reputation rate, multiple surveys over same area achieve 0.3 to 0.5 meters per point data resolution. High resolution three dimensional topographic data potentially holds useful information which can not be expressed by ordinal visualization method. In this study we propose Red Relief Image Map (RRIM). This new visualization method is based on multi-layered topographic information computed from gridded three dimensional data (DEM). RRIM can visualize the topographic slope, concavities and convexities at the same time. RRIM does not require the any specialty of geomatics nor mapping information to understand detail of topographic information to the image audience. The application of RRIM is not only LiDAR data but also wide variety three dimensional data such as SRTM, GTOPO30 and ETOPO2.