Recuperação da intensidade de laser scanners que utilizam a técnica LIDAR nas ocorrências de efeito de borda

Abstract

Several areas of knowledge use digital techniques to collect spacial data with higher resolution and precision. In special, Geology is using new equipaments to automate geological surveys and mappings. The digital acquisition made with terrestrial laser scanners records not only the target’s position and color, but also the return of the emitted signal’s intensity. When using the laser’s intensity return information, it may occur the edge effect, that is when the laser collides parcially with the target and part of the signal is lost or, also, collides with other undesired objects in the background. This effect makes the laser’s return intensity to be incorrect, when the reflectance of the materials that compose the target being analized. To solve this issue, a new algorithm was developed using the known data as the laser scanner’s position and signal’s divergence to recover the correct laser’s intensity when an edge effect is detected in the collected data. The results show that this technique is a possible solution to recover the correct laser’s return intensity according to the reflectance of the outcrop materials. Additional research is needed to optimize the algorithm and make a statistical analysis of the corrected laser intensity data.