Week 9 Slides

Question 1

Red Visible Band 2

Answer 1

Primary Applications: analysis of clouds and weather during day, .5 km resolution, .64 um, used when creating “true color” imagery.
Limitations: daytime only,

Question 2

Blue Visible Band 1

Answer 2

Primary Applications: detects smoke and aerosols, .47 um, input of RGB imagery.
Limitations: daytime only, scattering angle affects the dust/smoke signal.

Question 3

Brightness Temperature

Answer 3

Calculated by Plank Function (know equation)
At a given length, the radiance of a blackbody depends on ONLY its temperature.
A blackbody is 100% efficient at emitting radiation

Question 4

Clean Longwave IR Band 13

Answer 4

Primary Applications: Continuous day/night cloud feature identification and classification, convective storm signatures, and hurricane intensity. 10.3 um
Limitations: 10.3 um brightness temps are not really representative of 2 m shelter air temps, cannot provide a truly accurate “skin temp”

Question 5

Longwave IR Band 14

Answer 5

Primary Application: similar to clean window, but more absorptions, fire detection/volcanic ash/aerosol detection/land surface temp. 11.2 um
Limitations: not a clean window, surface/near surface and clear sky will be cooler than observed

Question 6

Dirty Longwave IR Band 15

Answer 6

Primary Applications: split window difference of 10.3-12.3 um, detects moisture and dust, can distinguish volcanic ash from dust from cloud water and ice
Limitations: WV absorbs atmospheric energy at 12.3 um so brightness temps will be cooler than observed

Question 7

WV and Effective Layer

Answer 7

WV imagery displays the effective layer of water vapor
Lower temps = effective layer is higher in troposphere
higher temps = effective layer is lower in troposphere

Question 8

Upper Level WV Band 8

Answer 8

Primary Applications: jet streams, troughs, ridges, potential turbulence, 6.2 um, key component of airmass RGB
Limitations: dense clouds obstruct the view,

Question 9

Mid Level WV Band 9

Answer 9

Primary Applications: jet streams, vorticity centers, signatures of turbulence, contrails, 6.9 um
Limitations: dense clouds can obstruct view

Question 10

Lower Level WV Band 10

Answer 10

Primary Applications: jet streaks, dry slots, potential turbulence, contrails, downslope winds, lake effect. 7.3 um
Limitations: dense clouds obstruct viewing

Question 11

SWIR Band 7

Answer 11

3.9 um, day and night sensing emitted terrestrial radiation, also senses reflected solar radiation, more signal is detected during the day so objects appear warmer during the day

Question 12

Airmass RGB

Answer 12

Red (6.2 um - 7.3 um), small input indicates MOIST UPPER LEVELS and large input indicates DRY UPPER LEVELS
Green (9.6 um- 10.3 um), small input indicates LOW TROP AND HIGH OZONE and large input indicates HIGH TROP AND LOW OZONE
Blue (6.2 inverted), small input indicates DRY UPPER LEVELS and large input indicates MOIST UPPER LEVELS

Question 13

Creating Airmass RGB

Answer 13

values from 0 to 255
(Example: red value of 0 means there is 0% red
red value of 255 means there is 100% red)
RED shows difference in Band 8 and Band 10
GREEN shows difference in Band 12 and Band 13
BLUE highlights smaller range of values from Band 8 but iinverted.

Question 14

Ozone Band 12

Answer 14

Primary Applications: used in RGB and in derived products

Limitations: WV absorptions occurs, complicating the use of Band 12