Spectral Reflectance Curves - What is Remote Sensing? (8/9)

When you are looking for some substance using remote sensing, it is very important to be aware of the substances spectral reflectance curves. This is the way that electro-magnetic energy interacts with it. Some substances have very unique spectral reflectance curves which allows them to be easily identified.
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[@thewebspatialist]

Awesome lecture...learnt a bunch

[@stardust1342]

Nice video ......expecting more such videos

[@jonathancorasmin3614]

Awesome video. You're great at explaining this stuff.

[@GeoMindzcom]

Thank you!

[@nyachangkuothgatluokmabor9855]

Thank a lot you are best lecturer

[@andrewlerox2248]

thank you so much, this helped with my project

[@briannamaclean8859]

Very informative and comprehensible! :)

[@GeoMindzcom]

Thank you!

[@alcielcode8005]

Thanks man It will be coming in my exam

[@ritaochieng7781]

Helpful,,,, it will be coming to my exam

[@maitripatel8918]

Thankssssss, helped alotttt

[@tinasheruzani2690]

thanks man this is helpful

[@GeoMindzcom]

Great. I am very glad it helped you.

[@centralmarg8042]

Hi thank you for you great videos. I have a doubt. If the reflectance of bare soil is more than water in the blue band, why we do not see soil as blue instead ?

[@GeoMindzcom]

I am sure that graph is a bit of a deliberate simplification for teaching purposes. Depending on where you are, soil can be almost any color. Where I am, soil is red. We have red clay everywhere. So, the spectral reflectance curve of your local soil may vary.

[@angelopoupard10]

Very helpful video, thanks ! However, on this graph shown, we can notice the spectral reflectance of water is higher at 0.6 micrometers (green colour) than 0.4 micrometers (blue colour) and yet clear water in nature reflecte blue light isn't it ?

[@GeoMindzcom]

That is a good point. I hope I did not mess up a bit on my re-illustration of that graph. But, there are a lot of examples of that graph online. Here is a link to another example: wtlab.iis.u-tokyo.ac.jp/wataru/lecture/rsgis/rsnote/cp1/1-9-1.gif

[@gautamsishir]

Hello Robinson, Thank you for a great explanation about surface reflectance. Could you please suggest me additional materials that explain how you calculate relative surface reflectance (i.e., %) from the digital number.
Thank you!
Sishir

[@GeoMindzcom]

I don't have a link readily at hand for that, so I think I would have to recommend one of the better remote sensing textbooks on the subject. Perhaps "Remote Sensing and Image Interpretation". That is the book I used when I was in grad school, and it was very thorough.

[@gautamsishir]

@@GeoMindzcom Thank you for your suggestion.

[@binayakthakur5122]

Thx a lot lot lot

[@GeoMindzcom]

You are very welcome.

[@maxgosselin62]

Elk tree 🦌