This is my entry for the T3 Season 2 - The Model challenge:
A survey of the earliest Celtic lunar calendar based on free open source tools
The royal tomb at Magdalenenberg, near Villingen-Schwenningen, in Germany’s Black Forest, is the largest Hallstatt tumulus grave in central Europe, measuring over 320ft (100m) across and (originally) 26ft (8m) high. The royal tomb functioned as a lunar calendar and preserves a map of the sky at Midsummer 618 BC, the presumed date of the burial. The order of the secondary burials around the central royal tomb fits exactly the pattern of the constellations visible in the northern hemisphere at Midsummer in 618 BC, while timber alignments mark the position not of the sunrise and sunset but of the moon, and notably the Lunar Standstill. Lunar Standstills are marked in several ancient cultures (including sites in Colorado and Ohio), usually by standing stones that indicate the point where the moon seems to rise and set in the same place, instead of rising in one place and appearing to move across the sky to set in another.
As such the royal tomb at Magdalenenberg is the earliest and most complete example of a Celtic calendar focused on the moon. Following Caesar’s conquest of Gaul, the Gallic culture was destroyed and these types of calendar were completely forgotten in Europe.
See also: http://en.wikipedia.org/
- A Hexacopter (Mikrokopter frame, APM 2.6) based on a design concept by Stehen Gienow.
- Canon Elph 110 HS, one converted to IR
The free open source image and 3D processing chain:
The open source Ground Control Station:
- Flight altitude: 50m AGL
- Ground image resolution: 0.7cm
- 3D point could before dense matching:
- Clipped 3D point cloud after dense matching (however, not the highest resolution possible):
You can download this file here (22MB *.zip).
- RGB orthophoto:
- IR orthophoto:
- Soil Adjusted Vegetation Index map:
- Digital surface model draped over a hill shade model and the IR orthophoto:
The georeferenced model
- Google Earth: T3_Magdalenenberg.kmz (with subfolders)
- Flight path
- Camera trigger locations
- RGB orthophoto
- IR orthophoto
- DSM model
- Size: 11MB
The 3D model to play with
- WebGL 3D model
- it might take some time to load...
- tested with Firefox, Chrome, IE and Safari (needs to be enabled)
- this is how it looks (in case it doesn't load)
A 3D visualization for some more serious analysis
- Enhanced Vegetaion Index
The APM Log file:
Some random remarks:
- All data is georeferenced
- MicMac (as well as the whole processing chain) is quite complex
- Due to security reasons I always take off in stabilize mode
- Landing should have been automatic but needed to be interrupted due to some curious onlookers
- APM+Droidplanner is a great professional product
- It would be great to have an image dataset (or several) available on DIYDrones for comparing image processing software
- Color calibration is a big issue
Thanks to Gary, DIYdrones, 3DRobotics, and the developers of the free open source tools!