Artefactos de Drone2Map en el mosaico orto

Question

Creé un mosaico orto en D2M. Primero con la configuración predeterminada y GSD 1. Contiene artefactos alrededor de todo el mosaico como se muestra a continuación.<\/P> <\/span><\/P>Después de leer algunas publicaciones en esta comunidad, cambié la configuración, como marcar "rolling shutter optimization", cambiar inicial a completo y marcar "use geometry verified matching". Esto produce aún más artefactos y mueve completamente el orto por unos cientos de metros.<\/P>Usando la configuración predeterminada, la calidad general es aceptable excepto por estos artefactos. Por favor, aconsejen cómo se pueden evitar estos problemas.<\/P>Sinceramente<\/P>

DerrickWestoby · Answer

You really want to be flying with 70%+ overlap with SfM.   Keep in mind that this is based off the drone's altitude above ground level and an image footprint projected into the ground.  If you're flying over tall buildings, especially at low (<200ft) altitudes, the overlap in those areas is going to be insufficient.  You may have 70%/70% overlap at ground level, but 50%/50% on the building roof.

FrankOuyang · Answer

As suggested by @DanPatterson, capturing more images using higher overlap ratio will help reduce the artifacts, such as increase it from 60% to 80% or 90%. This will increase processing time and the output point cloud size but it can significantly improve the quality of the output.

Another thing to consider, from my experience, is try to fly the UAV at the solar noon when the shadow is minimized. By doing so, object/area of interest will have the best illumination which helps the photogrammetry algorithms identify objects and reconstruct them and eventually, reduce the chance of having artifacts.

danretired · Answer

There other related links to the right of your post, for example,

Solved: Drone2Map imagery quality - Esri Community

which suggests "overlaps" setting