Evaluación de la precisión espacial de datos Lidar a partir de la comparación con la topografía convencional en el canal salitre, en Bogotá.

Abstract

In the context of urban planning and resource management projects in Bogotá, it is crucial to evaluate the accuracy of lidar data compared to conventional surveying. This assessment provides a fundamental basis for ensuring the reliability and usefulness of geospatial data for decision-making. This study evaluates the positional accuracy of a lidar point cloud dataset using the statistical methodology of the National Standard for Spatial Data Accuracy (NSSDA) standard of the Federal Geographic Data Committee. The study was carried out in Barrios Unidos, covering sections of the Simón Bolívar, San Fernando, Doce de Octubre, La Libertad, Entreríos, Julio Flores, Santa Rosa, and Potosí neighborhoods, approximately 6 km of the Salitre Canal. The main objective was to evaluate the accuracy of the lidar data obtained using UAVs and compare it with a conventional topographic survey in the aforementioned area. Differential static positioning and geometric leveling techniques were used, following the standards established in the EAAB (Bogotá Water and Sewer Company) standard NS30 V5.4, to ensure measurement accuracy. The LIDAR point cloud was captured in 2018, while the conventional topographic survey was conducted between January 20 and March 10, 2024. The results showed that both differential static positioning and geometric leveling met established accuracy standards. RMSE values ​​indicate that lidar data are suitable for working scales of 1:1000 to 1:2000 horizontally and vertically. However, for projects requiring higher accuracy, combining lidar data with other data collection methods is recommended.