David Santek, Rick Kohrs, Nick Bearson, Matthew Lazarra McIDAS Users’ Group Meeting 26 October 2010.

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Presentation transcript:

David Santek, Rick Kohrs, Nick Bearson, Matthew Lazarra McIDAS Users’ Group Meeting 26 October 2010

Outline Project overview IMGPARM COMP_ALLBAND Current results

Project Overview Combine data from polar and geostationary satellites to track clouds in high latitudes Geostationary satellites are good up to 50º-60º latitude Polar orbiting satellites are good poleward of 70º latitude This technique is designed to ‘fill the gap’

Project Issues Accounting for inter-satellite calibration differences Correcting for parallax in viewing the cloud tracers from different satellites and instruments Using the pixel time within the composite that corresponds to the viewing by each satellites when computing cloud velocity

IMGPARM: Create multi-band files BandDescription 1Grayscale values (brightness temperature) 2Time difference from nominal time (sec) 3Distance from satellite subpoint (km) 4Pixel area (km 2 ) 5McIDAS Satellite Sensor number (SS) 6Wavelength 7Parallax distance (km*10) 8Parallax direction (degrees)

COMP_ALLBAND All IMGPARM files are remapped with REMAP2 into a common projection COMP_ALLBAND then combines many IMGPARM files into a single file Choose highest resolution pixel Ensure pixels are in time range Retain all IMGPARM bands

Example composite Infrared composite Satellite ID number

Pixel Time (Difference from a nominal time) Blue: 0 to 15 minutes before nominal time Green: 0 to 15 minutes after nominal time

Pixel Distance (km) from Subpoint

Pixel Area (km 2 )

Parallax Distance (km)

Satellite-derived winds Arctic for 21 October 2010 Triplets of ½ hourly composites Composite building delayed by 3 hours Wind flags (blue) at all levels Potential targets (green) not tracked due to overlapping satellite data

Summary IMGPARM, REMAP2, COMP_ALLBAND process: 3-hour delay before running process Up to 60 input files every 15 minutes Each polar region takes about 3 minutes ADDE dataset (images and winds) DATALOC ADD LEOGEO LEOGEO.SSEC.WISC.EDU Composite with winds overlayed (LEO-GEO): IMGPARM and COMP_ALLBAND will be in McIDAS-XRD