MODIS (Terra) Corrected Reflectance (bands 3,6,7)The 3-6-7 composite assigns Bands 3, 6, and 7 to the red, green, and blue components of a digital image. This combination is good for revealing snow and ice because they are very reflective in the visible part of the spectrum, and very absorbent in Bands 6 and 7, which are a part of the spectrum called the short-wave infrared, or SWIR.
Snow and Ice
Since the only visible light used in these images (Band 3) is assigned to red, snow and ice appear bright red. The more ice, the stronger the absorption in the SWIR bands, and the more red the color. Thick ice and snow appear vivid red (or red-orange), while small ice crystals in high-level clouds will appear reddish-orange or peach.
Vegetation is absorbent in Band 3 and Band 7, but reflective in Band 6, and so will appear greenish in this band combination. Bare soil will appear bright cyan in the image since it much more reflective in Band 6 and Band 7 than Band 3.
Liquid water on the ground will be very dark since it absorbs in the red and the SWIR, but small liquid water drops in clouds scatter light equally in both the visible and the SWIR, and will therefore appear white. Sediments in water appear dark red.
ive seen images of Contrails right next to chemtrails, the chemtraisl do show small traces of water - because they are jets too flying through the same air, but 90% of the chemtrail does not show up in SWIR, where 90% of a contrail does show up in SWIR. Same app World daily, these trails are nonstop global, over every ocean and every landmass, very easy to compare with this App.
incorrect, you can see the hi altitude ice crystal clouds over the green land quite clearly as large pink blobs, the trails essentially disappear all together, leaving only a faint thin line of moisture visible in only the newest trails(to be expected from planes traversing in atmospheric moisture. But the 150 square miles of "Contrail" coverage does not come even close to showing in the SWIR imaging. I have compared trails side by side and under SWIR, 1 trail essentially disappears, while the other becomes bright white with spots of pink.