Compositing of MODIS Products
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Stephanie L Haines and Frank LaFontaine June 12, 2007 PowerPoint PPT Presentation

Compositing of MODIS Products. Stephanie L Haines and Frank LaFontaine June 12, 2007. Introduction. Coastal NWS offices wanted high resolution SST product to address forecast problems Weather associated with land/sea breezes Off shore weather such as clouds, precipitation, temperatures etc.

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Stephanie L Haines and Frank LaFontaine June 12, 2007

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Product compositing techniques for modis

Compositing of MODIS Products

Stephanie L Haines and Frank LaFontaine

June 12, 2007


Introduction

Introduction

  • Coastal NWS offices wanted high resolution SST product to address forecast problems

    • Weather associated with land/sea breezes

    • Off shore weather such as clouds, precipitation, temperatures etc.

  • Single pass of MODIS provides limited coverage

  • Simple composite generated from multiple passes of MODIS data provides spatially continuous cloud free coverage

    • Main assumption is that SST does not change significantly from one day to the next

    • High resolution (1 km), full coverage on a regional scale

    • Small scale features in SST gradients retained

  • Alternative to the Real-Time Global (RTG) SST analysis and/or the OSTIA analysis for model assimilation

  • Can also composite additional MODIS ocean color products such as chlorophyll


Methodology

Methodology

  • Use the 1km SST MODIS product to produce a detailed and spatially continuous SST field while minimizing cloud contamination and latency effects

    • Obtain SST in real-time from University of South Florida (USF)

    • Generate a SPoRT MODIS cloud mask for the same pass

  • Retain 5 clear (as determined by the cloud mask) SST values for each pixel separately for day and night

  • Average some of clear values to obtain a more consistent field

  • Evaluating the use of AMSR-E SST to reduce latency


Sst comparisons

SST Comparisons

Terra 04 UTC

Aqua 07 UTC

Terra 16 UTC

Aqua 19 UTC

  • MODIS SST composites generated 4 times daily at 1 km resolution

  • RTG-SST once daily 0.5 degree or 1/12 degree resolution

  • OSTIA once daily 5 km resolution

  • Loops available online at http://weather.msfc.nasa.gov/sport/sstAnimation/

RTG SST

0.5 degree

OSTIA SST

5 km


Work performed since last sac

Work Performed Since Last SAC

  • Operational domain expanded to include Central America and composites being provided to the SERVIR group

  • SST composites provided in near real time in GRIB (gridded binary) format for ease of use by modelers and additional users, used in several WRF modeling studies

  • Composites also provided to Mobile and Miami NWS offices within AWIPS

  • Journal article describing the method and validation for the May 2004 case, written and accepted for publication in the IEEE journal “Transactions on Geoscience and Remote Sensing”

  • SST composites provided to WorldWinds Inc.

  • Ocean color products obtained from USF and compositing work begun


Nasa products support marine weather

NASA Products Support Marine Weather

MERGED ATLANTIC MODIS AND AVHRR SST PRODUCT

MODIS composite SST serves as a data source for hybrid marine products.

Proprietary

  • SPoRT provides WorldWinds Inc. MODIS SST composites for their analysis system

  • WorldWinds packages SST with other marine products for distribution by WxWorx Inc. (an affiliate of Baron Services)

  • In conjunction with XM Satellite Radio Inc., WxWorx provides up to date weather information for boat owners

    • PC based display software

    • hand-held applications

WxWorx, Inc. products available to marine customers

MODIS SST data reaches over 8000 users in the marine community!


Ocean color composites

Ocean Color Composites

  • Obtaining in real time from University of South Florida the following products

    • Chlorophyll

    • Total suspended matter

    • Fluorescence line height

  • Started work on compositing these products

    • Of the two most recent values for each pixel, use the largest value in the composite

  • Composites and single passes put on web http://weather.msfc.nasa.gov/sport/oceancolor/

Single Pass of Aqua CHL

Aqua CHL Composite


Future work

Future Work

  • Continue to improve MODIS SST composites by

    • Improving latency by including AMSR-E SST in cloudy, non-coastal regions

    • Improve the SPoRT MODIS cloud mask for ocean applications

  • Improve the ocean color composites

    • Learn about the products from USF experts

    • Adjust the compositing techniques

  • Looking at generating West Coast composites (requested by WorldWinds). Requires near real time source of MODIS data – both SST and cloud mask

  • Provide ocean color composites to NWS offices, WorldWinds Inc.

  • Support field programs (ex. TCSP (summer 06), TC4 (summer 07)).

  • Proposals

    • WRF linked with coastal ocean model into the North Carolina Forecast System - NASA provide SST data and other remote sensing expertise. ROSES 2007 – Disaster Management. PI: Adel Hanna (UNC-Chapel Hill), Jedlovec and Haines Co-PIs

    • Daily Chlorophyll Products for Ecosystem and Fishery Applications, Co-PIs: Elizabeth Valenti (WorldWinds, Inc.) and Gary Jedlovec (NASA/MSFC) – RPC Council, May 2007.


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