Today my colleague Colin and I were given the chance to create oblique aerial photograph stereopairs of multiple study areas around Hong Kong from a helicopter. We accompanied our boss who has had 137 or so previous missions. The flight took exactly an hour covering 7 study areas from Lamma Island to Sai Kung. The front and rear left doors were taken off so my boss and I were able to get great photos.
What are oblique aerial stereopair photographs? Basically its a pair of photographs that have been taken at a same altitude capturing a subject at slightly different angles by a change in lateral position. These different angles of the object in each photo is interpreted by your brain as having a depth of field, which allows for a 3D image of the subject to appear once viewed under a stereoscope or 3D-goggles.
How does one create such an effect while in flight? The center of the camera lens is not to be fixed on a particular spot of the subject (in this case a hillslope) but continues with the flight path of the helicopter so that the subject appears at one side of the viewfinder and ends on the other.
**Sorry but I did not include a stereopair in this post because I don't know how to correctly position them on this site and image sizes may vary depending on which device they are viewed.
The helicopter. We started and ended our flight on the famous Peninsula Hotel in TST.
The Hong Kong Convention and Exhibition Center.
The IFC Tower.
Hong Kong looking east. Sheung Wan and Kennedy Town are on the right while the IFC Tower (on the right) and ICC Tower (on the left) are visible off in the distance.
Happy Valley
A view from the other side of Hong Kong looking west. I'd say we're currently over North Point.
My study area Fei Ngor Shan (Kowloon Peak). The linear feature that you see below the cliffs is scaffolding that leads to 3m deep trial pits that I have inspected and will continue to inspect throughout the study. I'm assessing the potential hazards that may arise from this hillside if it were to get hit by a 1 in 100/1000 year rainstorm. FUN STUFF!
Here is a quick video of my boss (back left) and I (front right) photographing this study area captured by 楊啟榮 (Yeung Kai Wing): http://www.youtube.com/watch?v=7Vuyb3Xcgpo&feature=youtu.be
Sharp Island which I have posted twice about in previous posts.
A tension crack representin'! M is for yours truly.
Lion Rock.
Lion Rock closeup. If you look closely you might spot tourists on the head of the lion.
Colin covering the right side.
Kowloon Peak at a distance.
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