Introduction to NCC in AWIPS VISIT Satellite Chat (18 Dec 2015)

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Presentation transcript:

Introduction to NCC in AWIPS VISIT Satellite Chat (18 Dec 2015) Curtis Seaman, CIRA Dan Lindsey, NOAA

What is NCC? Near Constant Contrast (NCC) is a way to display VIIRS Day/Night Band (DNB) imagery in AWIPS Converts DNB radiance to “pseudo-albedo” to provide visible imagery at night CONS: not a true albedo like DNB Lunar Reflectance product; values vary throughout lunar cycle PROS: Operationally supported by JPSS Program; provides some value even when there is no moonlight

NCC vs DNB Lunar Reflectance Moon above horizon ü Moon below horizon

When the Moon Hits the VIIRS, Like a Big Piece of… Great resource to find out about moon phase: http://www.calendar-365.com/moon/moon-calendar.html Moon below horizon from Last Quarter + 2 Days until First Quarter + 2 Days Otherwise, there is moonlight and NCC quality improves No Moonlight Available

Default NCC Display in AWIPS-II

Reset top color to white White lines are a known display bug. When you zoom in, they disappear.

Some Notes about Scaling (Color Tables) Default: 0 to 1.6 No moon

Some Notes about Scaling (Color Tables) Recommended: 0 to 1.0 No moon

Some Notes about Scaling (Color Tables) Extra stretched: 0 to 0.5 No moon

With Moonlight Scaled: 0 to 1.0

Reduced area of city lights With Moonlight Scaled: 0 to 1.0 NOTES: - Lines missing Reduced area of city lights Lack of noise

City Lights Expand Under Clouds No moon Scaled: 0 to 1.0 NOTES: Scattering of city lights by clouds makes city lights appear larger Also look for crisp vs. fuzzy edges

Snow, Low Clouds and Auroras NOTES: Auroras are saturating (> 1.0) near Hudson Bay Look for snow and low cloud signals Scaled: 0 to 1.0 With moon

Snow, Low Clouds and Auroras NOTES: Reduced saturation in aurora Made clouds darker Scaled: 0 to 1.6 With moon

Check out our NCC Quick Guide on the NOAA Vlab! Typical Values Typical NCC Values With Moon Without Moon Clouds 0.8-1.2 0.25-0.75 Snow 0.7-1.2 0.20-0.75 City Lights 2-20 5-1000 Auroras 1.5-20 2-500 Bare Ground 0.1-0.4 0.0-0.25 Scale accordingly! Check out our NCC Quick Guide on the NOAA Vlab! VLAB.NCEP.NOAA.GOV/WEB/GOES-R-END-USER-MISSION-READINESS-PROJECT/DAY-NIGHT-BAND