Remote Sensing #2 - ENVI Tutorial#1

In order to determine pixel characteristics we must first learn the program ENVI. This is only the very beginning and there are more videos in this course which will go into ENVI even deeper

With the SPECTRAL SIGNATURE window open, click anywhere on the map to see that position's spectral signature (along the 'X' is the wavelength of bands 1-7 and along the 'Y' is the reflectance)

Also, if your wondering what LOAD GREYSCALE does, it doesn't load a black and white map, it actually loads a map of the one band that you selected with WHITE being more of it and BLACK being less of it. See Tutorial 4 for more.

Regarding the infrared section of this video, plants find it easier to absorb lots of high (blue) and low frequncy light (red), green light is of frequency between both blue and red frequencies is difficult to absorb and so is reflected (https://www.quora.com/Which-colour-of-light-is-the-best-for-photosynthesis). Infrared however is almost completely reflected, the human eye cannot see infrared though [if we could plants would be VERY bright red]. This is why we place infrared filters on cameras to see healthy vegetation (biomass). Because a plant that is healthy (AKA absorbing a lot of blue/red light) will also be emitting a lot of unusable light (infrared).

Landsat uses 7 bands: [Right click on a layer -- View MetaData -- to see your bands]
1 - Blue
2 - Green
3 - Red
4 - Near Infrared
5 - Shortwave Infrared (1)
6 - Thermal
7 Shortwave Infrared (2)
Get the link to the textbook/PDF (Free!) for this course, get it here: https://www.crcsi.com.au/history-2/earth-observation-series-2/
Download volumes Vol 1A & and Vol 1B

Видео Remote Sensing #2 - ENVI Tutorial#1 канала The Rational Planner