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Mapping hidden WW2 bunkers
335 12 2022-5-1
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AlansDronePics
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For anyone who likes peeking at Hi-Res photos of German WW2 bunkers and trenches as a map, this might interest you.The link is because the file size is very large.

Click for Hi-Res map/photo
There are bunkers on the cliff edge that appear as small round holes where guns were fixed. Below are large concrete bunkers. You can see how difficult such things are to spot at just 400 feet. At that height, any plane would be practically flying down the gun barrel.

There are recently cleared areas that show in good detail what has been dug out. Yes, dug out! The British Government ordered the trenches to be backfilled and bunkers sealed at the end of the war. Alderney have just realised what a tourist draw these installations are, so now some poor chap has to hand dig a lot of the infill to open it up. A digger has been used on the surface, but the trenches are too delicate and well hidden to put a digger bucket into them.
You will also notice intriguing disturbances to the adjacent landscape which hint at the unexposed trenches and bunkers, yet to be opened back up. Generally you can't see this from the ground.
The Survey is not complete yet because of work still to be done.
The historian in charge of the work will use the map to plot the defences for his books that are sold all over the world.
Also of interest is the fact the airport is next to this site and mapping had to be fitted in between landing flights, that today passed overhead.
Yes, ATC were informed and an unscheduled flight came in just as I landed.
Everything went well with 4 mph wind along the cliffs, a particularly gusty location. Beats me how they can land a plane in strong cross winds. Actually, the wheels have come off a few times, that and the occasional curious goat on the runway.

2022-5-1
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Blériot53
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?Clicking the link above just takes me back to the Forum Homepage?
2022-5-1
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AlansDronePics
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Blériot53 Posted at 5-1 09:09
?Clicking the link above just takes me back to the Forum Homepage?

My sincere apologies. The link has now been corrected.
Thank you for pointing it out.
2022-5-1
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Blériot53
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AlansDronePics Posted at 5-1 09:15
My sincere apologies. The link has now been corrected.
Thank you for pointing it out.

No worries
I'll take another look
2022-5-1
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Blériot53
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AlansDronePics Posted at 5-1 09:15
My sincere apologies. The link has now been corrected.
Thank you for pointing it out.

That works
Have you considered doing any 360 degree panos ?
2022-5-1
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AlansDronePics
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For a general view, a panoramic would be the preferred approach. In this case, the result is a map so features can be accurately traced and a clean drawing created for publishing in a book.
The large ground area involved means that a small manhole sized feature won't show up on a pano which is effectively low res by comparison with a tiled composite.
As an aside, I have produced a number of tiled hi res composite of the small town (more a village, actually)  where i live. Other drone users may like to know how fascinating  people find townscape shots of their home town.
I mention it as a revenue stream for those who can do this.
I have a large dining room table top showing the town and it's like a magnet for visitors.
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DAFlys
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For completeness you should probably photoshop the car out of it.  
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AlansDronePics
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The white car is my Honda Advance.
Joke
If I photoshoped it out, I would have to walk home. Ha ha
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AlansDronePics
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For some reason, the link results in a poor quality image on my phone but is perfect on my laptop. It does take about 10 seconds to fully show the detail.
I apologise for the disappointment if you can only see a low grade image.
Can't figure out the reason.
2022-5-2
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Blériot53
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AlansDronePics Posted at 5-1 09:32
For a general view, a panoramic would be the preferred approach. In this case, the result is a map so features can be accurately traced and a clean drawing created for publishing in a book.
The large ground area involved means that a small manhole sized feature won't show up on a pano which is effectively low res by comparison with a tiled composite.
As an aside, I have produced a number of tiled hi res composite of the small town (more a village, actually)  where i live. Other drone users may like to know how fascinating  people find townscape shots of their home town.

I bet it's a great talking point for visitors.
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DowntownRDB
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Nice look back at the past.    What a great project to document.  
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Montfrooij
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Very cool work!
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AlansDronePics
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Here is a reduced res page of the interim presentation of the area drawn as a diagram with supporting images of the bunkers.
Please bear in mind that all these structures were completely buried immediately after the war and have been excavated, mainly by hand by volunteers.  It is remarkable how new they look after all this time.
There are lots of adjacent areas to be uncovered yet.
It is nice to know that a drone can play a small but important part in revealing history. As you might imagine, to produce an accurate map using normal land surveyors tools would be very time consuming. The drone saved weeks of work.
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2022-5-9
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