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21st Mar 2014, 14:53
Replies: 11,831
Views: 23,851,921
Posted By Oldpilot55

I looked through the spec of the Leeuwin. There...

I looked through the spec of the Leeuwin. There is nothing there that can see the seabed 6000 metres down, despite what Wikipedia says. Unless they have a deep tow system for the sidescan and a...
21st Mar 2014, 08:16
Replies: 11,831
Views: 23,851,921
Posted By Oldpilot55

Infrequentflier 511 Do you mean Lidar? Green...

Infrequentflier 511
Do you mean Lidar? Green laser Lidar can penetrate up to 70 metres or so depending on the properties of the water (and atmosphere) so yes it can be used to detect objects under...
20th Mar 2014, 08:02
Replies: 11,831
Views: 23,851,921
Posted By Oldpilot55

Mesoman

Agreed.
Yes, it was a mistake. They are different spectrums. I've corrected the post. The scale calculation is correct though.
20th Mar 2014, 07:39
Replies: 11,831
Views: 23,851,921
Posted By Oldpilot55

http://www.abc.net.au/news/image/5335064-3x2-700x4...

http://www.abc.net.au/news/image/5335064-3x2-700x467.jpg

If you have the focal length of the camera and the height of the aircraft then you have the (approximate) scale of the photo. Then you can...
16th Mar 2014, 06:15
Replies: 11,831
Views: 23,851,921
Posted By Oldpilot55

Visual sighting of aircraft over long distances

When I was a spotter and listened to VHF radio from my home in Glasgow, elevation 100' or so I could see contrails over Belfast, a distance of approx 100 nautical miles. The trails were very low to...
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