If this is your first visit, be sure to check out the FAQ by clicking the link above. You may have to register before you can post: click the register link above to proceed. To start viewing messages, select the forum that you want to visit from the selection below. |
|
|
|
Thread Tools | Display Modes |
#1
|
|||
|
|||
Possible remote thermal finder?
|
#2
|
|||
|
|||
Possible remote thermal finder?
On Jan 21, 2:04*pm, bildan wrote:
http://www.newscientist.com/blogs/on...lephoto-lens-s... Yes! It's always struck me that a little signal processing on the shimmer you see in telephoto lenses might work to show thermals. A bit of signal processing would also show birds, gliders, cornstalks, cu development, and other stuff that the naked eye tends to miss. Darn day job... John Cochrane |
#3
|
|||
|
|||
Possible remote thermal finder?
bildan wrote:
http://www.newscientist.com/blogs/on...photo-lens-spo ts-clear-air.html Crap - they almost stole my idea! ;-) Seriously though, I had been thinking of using a normal video camera with changing focus to check for dust sparkle at different ranges and do frame comparisons. Take two (or more) snapshots at each focus range. Subtract out image from previous focus range (trying to eliminate the roughly constant out of focus "blur" of the background) to leave only spots in the new focus range that are likely to be dust particles. Do this at least twice, waiting some time T between frames. Use a heuristic to pair up pixels that appear to represent the same particle in both frames but have moved. Compute speed of movement of particles based on focus range, time T, and subtended arc the particles appear to have moved. You now have an estimate for wind speeds and directions normal to your view line at that distance. The above doesn't appear to be what Boeing has in mind; they appear to be using distortions of the distant background itself. |
#4
|
|||
|
|||
Possible remote thermal finder?
On Jan 21, 4:36*pm, Jim Logajan wrote:
bildan wrote: http://www.newscientist.com/blogs/on...photo-lens-spo ts-clear-air.html Crap - they almost stole my idea! ;-) Seriously though, I had been thinking of using a normal video camera with changing focus to check for dust sparkle at different ranges and do frame comparisons. Take two (or more) snapshots at each focus range. Subtract out image from previous focus range (trying to eliminate the roughly constant out of focus "blur" of the background) to leave only spots in the new focus range that are likely to be dust particles. Do this at least twice, waiting some time T between frames. Use a heuristic to pair up pixels that appear to represent the same particle in both frames but have moved. Compute speed of movement of particles based on focus range, time T, and subtended arc the particles appear to have moved. You now have an estimate for wind speeds and directions normal to your view line at that distance. The above doesn't appear to be what Boeing has in mind; they appear to be using distortions of the distant background itself. My impression,(could be wrong) is that they are using a sharp horizon line to look for distortions due to air density variations. If so, that shouldn't be a problem in the clearer air of the west since we fly in daylight hours below cloudbase. It appears to use only a standard high resolution camera and some heavy image processing software. |
#5
|
|||
|
|||
Possible remote thermal finder?
On Jan 21, 6:16*pm, John Cochrane
wrote: On Jan 21, 2:04*pm, bildan wrote: http://www.newscientist.com/blogs/on...lephoto-lens-s... Yes! It's always struck me that a little signal processing on the shimmer you see in telephoto lenses might work to show thermals. A bit of signal processing would also show birds, gliders, cornstalks, cu development, and other stuff that the naked eye tends to miss. Darn day job... John Cochrane The idea of a remote thermal finder is already being worked on by a very distinguished scientist who lives and fly's @ the best soaring center on the planet earth. My money is on him. |
#6
|
|||
|
|||
Possible remote thermal finder?
On 1/21/2011 5:53 PM, mpcehand wrote:
On Jan 21, 6:16 pm, John wrote: On Jan 21, 2:04 pm, wrote: http://www.newscientist.com/blogs/on...lephoto-lens-s... Yes! It's always struck me that a little signal processing on the shimmer you see in telephoto lenses might work to show thermals. A bit of signal processing would also show birds, gliders, cornstalks, cu development, and other stuff that the naked eye tends to miss. Darn day job... John Cochrane The idea of a remote thermal finder is already being worked on by a very distinguished scientist who lives and fly's @ the best soaring center on the planet earth. My money is on him. Pilots in 16 different clubs around the world are now trying to think who in their club could be working on a remote thermal sensor. I'm expecting more discussion about which soaring center you could mean, than about the remote thermal finder. Personally, my soaring would improve if I could reliably find the thermal I just flew through. -- Eric Greenwell - Washington State, USA (change ".netto" to ".us" to email me) |
#7
|
|||
|
|||
Pilots in 16 different clubs around the world are now trying to think
who in their club could be working on a remote thermal sensor. I'm expecting more discussion about which soaring center you could mean, than about the remote thermal finder. Personally, my soaring would improve if I could reliably find the thermal I just flew through. -- Eric Greenwell - Washington State, USA (change ".netto" to ".us" to email me)[/quote] I'm with you Eric, it was there three seconds ago. Walt Connelly |
#8
|
|||
|
|||
Possible remote thermal finder?
On Jan 21, 11:54*pm, Eric Greenwell wrote:
Pilots in 16 different clubs around the world are now trying to think who in their club could be working on a remote thermal sensor. Not this one. Even if you didn't know the poster's name and where he flies you could make a good guess at his site location from reviewing the posting history. Don't know how many other counties he has flown in though or how many sites he has flown at. Andy |
#9
|
|||
|
|||
Possible remote thermal finder?
Personally, my soaring would improve if I could reliably find the
thermal I just flew through. Eric Greenwell - Washington State, USA Eric, Thanks so much for the laugh out loud belly laugh you just caused with that statement. That comment hits close to home as well. Still chuckling as I write this. Bruno - B4 |
#10
|
|||
|
|||
Possible remote thermal finder?
wait I thought thats why everyone is getting PowerFLARMs?
|
|
Thread Tools | |
Display Modes | |
|
|
Similar Threads | ||||
Thread | Thread Starter | Forum | Replies | Last Post |
Thermal Forcasting -Thermal index | gldrgidr | Soaring | 6 | November 27th 10 10:26 PM |
National Rental Aircraft Finder | Larry Dighera | Piloting | 5 | September 4th 07 11:23 PM |
Hole Finder | [email protected] | Home Built | 2 | March 6th 06 02:32 PM |
Thermal Data Files Thermal Mapping Project Australia | Mal | Soaring | 0 | December 2nd 05 11:14 PM |
cheap fuel finder? | [email protected] | Owning | 11 | May 7th 05 12:58 AM |