The Hainich Flight Campaign

At the end of August 2018 a consortium was initiated by Dr. C. Thiel (DLR) to start a flight campaign within the Hainich national parc area in Thuringia (DLR Jena: Dr. C. Thiel, FSU Jena: Dr. S. Hese, University Göttingen (LS für Bioklimatologie, Prof. Dr. A. Knohl / Dipl.-Ing F. Tiedemann), national parc Hainich: Manfred Grossmann & […]

Erste urbane Copter Befliegung über Jena

In Kooperation mit der Abteilung Geoinformation (Leitung Dr. Markus Meinhardt) der Stadtverwaltung Jena  ( Dezernat III – Stadtentwicklung & Umwelt, Fachdienst Stadtumbau & Infrastruktur) wurde erstmalig durch den Lehrstuhl für Fernerkundung mit einem Quadrocopter eine städtische Flächenbefliegung durchgeführt. Ziel ist hier die Ableitung georeferenzierter  Ortho-Bildmosaike (sogenannte “True Ortho Bilder”), ein Gebäudehöhenmodel und ein texturiertes 3D Fassadenmodel. […]

Hotspot Effects in Micro Copter Data

A shot from last year vegetation point cloud mapping in Brandenburg. Strong Hotspot-Effect visible with easily visible shadow projection of the quadrocopter shape on the tree crown texture. Nice example of this direct back-reflection effect on vegetation (crown surface in this example), although you can also clearly see the same effect on the grassland vegetation in […]

Absolut Accuracy of the Phantom 4 Pro Ortho Mosaic

Some results from DGPS point measurements with a Stonex S9III GNSS DGPS receiver indicate an offset of 1.5-3 m to the Phantom 4 Pro ortho mosaic images. The relative accuracy is however much better. The Phantom 4 Pro derived ortho mosaic (without reference points) has a standard deviation of 0.31 to 0.36 m. When comparing […]

Speeding up Agisoft Photoscan

For some of the copter data processing folks Agisoft Photoscan turns out to be the most important tool to calculate point clouds, orthoimages and nadir data mosaics. Problem: very long processing times with dense point cloud calculations with high or ultra-high settings (full resolution image matching with SfM (Structure from Motion) algorithms). Some nice net […]