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I tried to look for hidden rock art at Ankgor Wat by imaging with multiple bandpass filters and amplifying cross-spectral differences. I didn't succeed, but may

by qurren 2mo ago

I tried to look for hidden rock art at Ankgor Wat by imaging with multiple bandpass filters and amplifying cross-spectral differences. I didn't succeed, but maybe I was in the wrong place. The shit guards there also didn't like me using a tripod while I changed filters, so it was also hasty.

blincoln 2mo ago
If it makes you feel any better, I've also never had any luck finding hidden rock art, petroglyphs, or similar using multispectal bandpass filters or decorellation stretching. I was super excited about DCS based on some of the recovered petroglyph photos online, and integrated it into some software I wrote years ago.[1] Still hoping I find something as interesting with it as the fellow mentioned in the article. It works, but I haven't had a "gosh, I never would have seen that without DCS!" moment. [1] https://www.beneaththewaves.net/Photography/Decorrelation_Stretch_Images.html https://www.beneaththewaves.net/Photography/Decorrelation_St... / https://www.beneaththewaves.net/Software/The_Mirrors_Surface_Breaks.html https://www.beneaththewaves.net/Software/The_Mirrors_Surface...
wdutch 2mo ago
Sounds like they were the opposite of shit if they noticed someone setting up specialist equipment. I don't think any national monument in the world would be keen on people doing that without advanced permission.
- qurren 2mo ago
  You will never get explicit permission unless you have connections. So until that kind of beaurocracy changes, this is the kind of thing you just go ahead and do. Life is short, assuming it is fully non-destructive and leave-no-trace, just do it until someone gets in your way.
- fc417fc802 2mo ago
  As long as it's equivalent to a camera on a tripod, why not? Outside of impeding traffic flow or museums that want to charge you for it being bothered by that seems entirely counterproductive.

by qurren 2mo ago

blincoln 2mo ago

If it makes you feel any better, I've also never had any luck finding hidden rock art, petroglyphs, or similar using multispectal bandpass filters or decorellation stretching. I was super excited about DCS based on some of the recovered petroglyph photos online, and integrated it into some software I wrote years ago.[1] Still hoping I find something as interesting with it as the fellow mentioned in the article. It works, but I haven't had a "gosh, I never would have seen that without DCS!" moment. [1] https://www.beneaththewaves.net/Photography/Decorrelation_Stretch_Images.html https://www.beneaththewaves.net/Photography/Decorrelation_St... / https://www.beneaththewaves.net/Software/The_Mirrors_Surface_Breaks.html https://www.beneaththewaves.net/Software/The_Mirrors_Surface...

wdutch 2mo ago

Sounds like they were the opposite of shit if they noticed someone setting up specialist equipment. I don't think any national monument in the world would be keen on people doing that without advanced permission.

qurren 2mo ago
You will never get explicit permission unless you have connections. So until that kind of beaurocracy changes, this is the kind of thing you just go ahead and do. Life is short, assuming it is fully non-destructive and leave-no-trace, just do it until someone gets in your way.
fc417fc802 2mo ago
As long as it's equivalent to a camera on a tripod, why not? Outside of impeding traffic flow or museums that want to charge you for it being bothered by that seems entirely counterproductive.