Transcript Using MODIS channels as proxy for Himawari

Australian VLab Centre of Excellence
National Himawari-8
Training Campaign
Introduction to the Volcanic Ash
RGB product (Indonesia)
Part 1a: Instructions
• Now that you have downloaded the PowerPoint file, please read the
Instructions in Parts 1a (this slide) and familiarise yourself with the
Learning Outcomes in slide 1b (next slide)
• Print out the Worksheet in Part 2a of this file (if applicable)
• Examine the Pre-activity Resources in Part 2b of this file (if applicable).
• Download the appropriate accompanying Video Recording (.wmv file).
The recording is typically of 3-13 minute duration.
• Commence listening to the Recording. Pause the Recording whenever
you want to annotate notes on the Worksheet.
• You may wish to examine the slides in Part 3 of this file in Slideshow
mode when you stop the Recording. Note that Rapid Scan imagery in
the animations embedded in the PowerPoint slides is often clearer than
in the Recording.
• Towards the end of the recording, recommended answers for the
exercises are sometimes given.
Part 1b: Learning Outcomes
At the end of this exercise you will:
• Have a basic knowledge how the Volcanic Ash RGB product is constructed
from multiple satellite channels and the physics and meteorology
underpinning this.
• A better understanding of the advantages and the limitations of the
Volcanic Ash RGB product in comparison with visible and infrared satellite
imagery in the operational monitoring, nowcasting and short term
forecasting of a volcanic eruption over Indonesia.
• Be able to identify and locate volcanic ash (and volcanic SO2) and other
specific meteorological features in the Volcanic Ash RGB product.
• Note – corresponding WMO-1083 Capabilities and BOM Enabling Skills are
given on the link "Learning Outcomes" on the National Himawari-8
Training Campaign homepage.
Part 2a: Worksheet for the exercise
• The worksheets " Volcanic Ash RBG product compared to
remapped true colour visible image / single channel infrared
image " are on the next two slides . Please print these slides out
and use these to make your notes
Part 2b: Pre-activity resources
• Please study the four slides of Part 2b to familiarize yourself with the
Volcanic Ash RGB product.
Part 2a: Volcanic Ash RGB product compared to remapped
true colour visible image
(example Volcanic Ash RGB and Sangeang Apie eruption 31st May 2014)
remapped 'true colour' visible
Please annotate =
Also annotate as (?) = features that you are unsure of
images courtesy NASA/EOSDIS/Lance Rapid Response
Part 2a: Volcanic Ash RGB product compared to remapped
single channel infared image
(example Volcanic Ash RGB and Sangeang Apie eruption 31st May 2014)
11 micron infrared
Please annotate =
Also annotate as (?) = features that you are unsure of
images courtesy NASA/EOSDIS/Lance Rapid Response
Part 2b: RGB products for Operational Forecasting –
EumetSAT recommendation – Ash RGB product
Two RGB composites which complement each other
Airmass RGB
24 hour Microphysical RGB
Five application specific RGBs
Day
Microphysical
RGB
Night
Microphysical
RGB
Day Severe
Convection
RGB
Snow / fog
RGB
from RGB Products
Overview (RGB Tutorial)
J. Kerkmann EumetSAT
Natural
Colours RGB
Part 2b: Dust
RGB beams
explained
BTD 12.0 10.8
Split window, but with the opposite sign to usual. Ash is positive so that it
will be bright and contribute to the RGB
BTD 10.8 –
8.7
Compares the SO2 absorption band at 8.5um with a non-absorbing IR
band to get the SO2 signal. Also detects some ash, but the scaling
emphasises SO2.
IR 10.8
Infrared channel scaled to provide a high contrast background for ash
detection
Combining beams
•
Yellow is made by mixing red and green
•
Magenta is made by mixing red and blue
•
Cyan is made by mixing green and blue
from http://oiswww.eumetsat.org/IPPS/html/bin/guides/msg_rgb_ash.ppt
Part 2b: Dust RGB beams explained
Volcanic Ash (high RED component, weak GREEN component, weak Blue component)
Volcanic SO2 (low-mod RED component, high GREEN component, mod-high Blue component)
Thin ice cloud (0 RED component, 0 GREEN component, 0 Blue component)
from http://oiswww.eumetsat.org/IPPS/html/bin/guides/msg_rgb_ash.ppt
Part 3: Volcanic Ash RGB product compared to remapped
true colour visible image – work slide
(example Volcanic Ash RGB and Sangeang Apie eruption 31st May 2014)
remapped 'true colour' visible
Please annotate =
Also annotate as (?) = features that you are unsure of
images courtesy NASA/EOSDIS/Lance Rapid Response
Part 3: Volcanic Ash RBG product compared to remapped
single channel infared image – work slide
(example Volcanic Ash RGB and Sangeang Apie eruption 31st May 2014)
11 micron infrared
Please annotate =
Also annotate as (?) = features that you are unsure of
images courtesy NASA/EOSDIS/Lance Rapid Response