Potencialidade dos filtros implementados nos programas LAStools e RiscanPRO aplicados ao laser scanner terrestre

The acquisition of spatial data with the Laser Scanner has grown considerably in recent years, due to its potential to obtaining a large amount data in a short time. However, it has as a result a dense product which requires the application of filtering techniques for use. In view of above, this study aims to compare the filtering methods implemented in programs: RiscanPRO and LAStools, to obtain a Digital Elevation Model, not considering the vegetation and some elements of anthropic use, to show just the ground. Was compared four developed DEMs, two make with RiscanPRO software filters (one with original parameters and the other with some modifications), and two in software LAStools without changes. These choices were made because the process of filtering is most automatical in LAStools than RiscanPRO. Changes in LAStools bring small diferences between the original filter. The filter that has been modified in RiscanPRO, proved so efficient so that its results can be compared to the LAStools. These results depends of study area, if have a lot of features for filtering perhaps doesn’t show a good product. In general, the LAStools software showed the best result, even being developed for treat Laser Scanner data from Airborne (LiDAR).