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McIDAS -XCD Future. 2010 MUG Meeting Jerrold Robaidek. What is McIDAS -XCD?. M cIDAS - XCD. McIDAS X C onventional data D ecoder. McIDAS-XCD files, decodes and indexes the NOAAPORT data stream (or other data streams) into formats that can be served by McIDAS-X ADDE servers.

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Mcidas xcd future


2010 MUG Meeting

Jerrold Robaidek

What is mcidas xcd
What is McIDAS-XCD?




data Decoder

McIDAS-XCD files, decodes and indexes the NOAAPORT data stream (or otherdata streams) into formats that can be served by McIDAS-X ADDE servers.

Output formats include McIDAS MD files, text files, McIDAS GRID files, GRIB and

GRIB2 files, NEXRAD files, and GINI files.

Mcidas xcd history
McIDAS-XCD History

  • Before 1994, conventional data was decoded on IBM mainframe (Whittaker)

  • Early 1990s moved to a distributed system. Prototypes developed for McIDAS-OS2 (PC McIDAS) Called McIDAS-OCD (Pyeatt)

  • 1994 first version on Unix. Required McIDAS-X. Named McIDAS-XCD (Pyeatt)

  • Data came in on a Central Data Card via the Familyof Services.

  • NOAAPORT certified operational on November 25, 1998 data broadcast over L-Band ingested by SSEC SDI

Noaaport channels

  • GOES Channel

    • GOES East visible, infrared, and water vapor for the Eastern Conterminous United States (CONUS), Puerto Rico, supernational composites, and Northern Hemisphere (NH) composites

    • GOES West. visible, infrared, water vapor for CONUS, Alaska, and Hawaii; supernational composites, and NH composites.

  • *NCEP/NWSTG Channel (NWSTelecommunications Gateway)

    • model output from the National Centers for Environmental Prediction (NCEP)

    • observations, forecasts, watches and warnings produced by NWS Forecast Offices

    • WSR-88D radar products

    • most observational data over North America.

  • *NCEP/NWSTG2 Channel

    • supplements the NWSTG channel.

  • Non-GOES Imagery/DCP Data Channel

    • GOES DCP data

    • MTSAT/GOES-West/GOES-East/METEOSAT-7/METOSAT-9 composites for visible, IR, and water vapor products (every 3 hours)

    • OCONUS grids.

Xcd data volumes
XCD Data Volumes

TDWR RADAR products added

Model GRIB volume steadily increasing

No significant volume increases 2003-2005

Introduction of NEXRAD (operational January 1, 2001)

Mostly text, point some Grids 170 MB in 1998 – 300 MB in 2000


10.24 Mb/s (1/2005)

NOAAPORT DVB-S2 begins 30 Mb/s (March-April 2011)

NOAAPORT Operational 1.6 Mb/s (11/25/1998)

Noaaport data flow into ssec
NOAAPORT Data flow into SSEC

Currently we get NOAAPORT data in two ways

  • Directly from DOMSAT via DBS using NOVRA S75

  • Over the Internet via LDM

What mcidas xcd does well
What McIDAS-XCD does well

  • Filing and indexing text data

  • Filing and indexing point/MDXX

  • Data management for NEXRAD

  • Can incorporate local data feeds

Mcidas xcd criticisms
McIDAS-XCD Criticisms

  • Installation/upgrades are difficult (many steps, prone to user error)

  • System is complex, large learning curve for operators, and very large learning curve for new programmer

  • Performance can be an issue

  • Data stored in format different than incoming format

  • Can’t handle BUFR (except for filing)

What s next for mcidas xcd
What’s next for McIDAS-XCD

  • McIDAS-XCD Survey (sent out immediately following this meeting)

    • Find out what users like/don’t like

    • Find out what parts of McIDAS-XCD are used

    • Solicit input on the future directions

  • Does McIDAS-XCD need to change?

  • If yes, how?

    • Stand alone decoders?

    • LDM decoders?

    • ADDE servers?

    • Other server model? THREDDS? RAMADDA?