INFLUENCIA DE LOS GROUND CONTROL POINTS (GCPS) EN LA PRECISIÓN DE PRODUCTOS CARTOGRÁFICOS GENERADOS POR VEHÍCULOS AÉREOS NO TRIPULADOS (VANTS) EN UNA ZONA DE VARIACIÓN ALTIMÉTRICA
Palabras clave:
GCPs, pontos de controle, RMSE, VANT, SfM-CMVSResumen
El procesamiento de imágenes obtenidas por Vehículos Aéreos no Tripulados (VANTs), con avances en la técnica Structure from Motion – Multi-View Stereo SfM-MVS, se ha popularizado en estudios en el área de Geociencias, teniendo diversas aplicaciones por su bajo costo, rapidez y practicidad del método. La practicidad significa que los usuarios menos experimentados utilizan el método y, a menudo, la precisión cartográfica queda en un segundo plano. La precisión y exactitud de los modelos obtenidos con vehículos aéreos no tripulados han sido objeto de estudios en los últimos años, pero todavía es necesario realizar estudios en profundidad sobre el mapeo de áreas escarpadas donde el rango de altitud puede interferir con la calidad del modelo. El objetivo de esta investigación fue analizar la variación del Error Medio Cuadrado (RMSE) según la influencia del número de Ground Control Points (GCP) y estimar un número ideal de puntos de control que deberían usarse para producir resultados precisos en un área de extracción de basalto al cielo abierto, en la forma de plataformas en el estado de Rio Grande do Sul, con una variación de elevación de aproximadamente 50 m. Con un número de 10 a 16 GCP, se observó una estabilización de los errores en el área de estudio, pero otros factores además del número de GCP demostraron ser importantes en la variación del error, como la distribución de puntos, la iluminación, la tasa de superposición de imágenes y la variación en escala debido a la altura de la foto.
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