http://www.joss.ucar.edu/ihop/dm/

Composites: What and Why

A composite dataset is a collection (over some time period and region) of similar data (e.g. surface met) from a variety of sources, put into a common format, and passed through a uniform quality control.

Why does UCAR/JOSS develop composites?

- Provides data in a uniform format with QC.

- Allows determination of network/site problems.

- Useful for model applications.

- Prevents duplication of effort.

GENERAL DATASET PROCESSING LIFE CYCLE

Contact SRC Agency to Acquire Data and Metadata

Wait for SRC Agency Data/Metadata Preparation

Examine Data & Metadata for Consistency and Completeness

Acquire Data and Metadata OR Create “Best” Metadata

Develop New Software or Modify Existing Software

Acquire Computer System Space and Time

Process Data and Metadata then Check

Form Composite with Like Datasets

Perform QC and Final Data Checks. Generate Statistics

Create EBUFR format data & DOCS for CODIAC

Load Data and Metadata onto CODIAC

ACTION

Prepare ASCii format data & docs for CD-Roms

Prepare, manufacture, & distribute CD-Roms

Add stn info to final list

Incomplete?

ProcessingProblems?

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• Phone, email, paperwork, $, meetings, procurement arrangements. (Days to months)

• (Minutes to months)

• Auto retrieval, FTP, online requests, etc. (minutes to days)

• Verify AOI, TOI, Format; spot check values, visual inspection or limited processing (Minutes to days)

• Format change, new parameters manual “cleanup”, etc. (Days to months)

• Purchase hardware, configuration management, etc. (Minutes to days)

• Put into common format, run data checkers “check gross limits” (Days to months)

• HQC for SFC, Gross limits for precip, Composite level and value checkers, limited statistics (% G, B, D by network, stn, parameter for SFC). (days to months)

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Hourly Surface Meteorological Data Composite (743 stations)

CoAgMet (*) (23)

AWOS (*) (110)

RAWS (+) (10)

SCAN (o) (6)

GWMD (*) (18)

Ameriflux (+) (3)

HPCN (o) (72)

Texas ET (o) (19)

KVII-TV (+) (4)

MADIS (o) (246)

NMSU (*) (7)

5-min sites (o) (225)

Composite Data Sets To Be Developed by UCAR/JOSS for IHOP-2002

• Surface Meteorological - 1 min, 5 min, and Hourly

• Precipitation - 15 min, Hourly, and Daily

• Soundings - High Resolution and

5 hPa

1-min Surface Meteorological Data Composite (65 stations)

ASOS (41)

ARM SMOS (14)

ABLE AWS (5)

NCAR Supp. (5)

Oklahoma Mesonet (115)

NCAR ISS/ISFF (10)

West Texas Mesonet (34)

1-min sites (65)

5-min Surface Meteorological Data Composite (224 stations)

15-minute Precipitation Composite

NCDC Coop (429)

5-min surface (224)

Hourly Precipitation Composite

NCDC Coop (509)

NCEP hourly (1155)

Hourly Met (743)

Daily Precipitation Composite

NCDC Coop (1581)

Hourly Met (743)

NCEP Daily (1611)

IHOP 2002 DATA BASE STATUS(as of 30 September 2003)

• 215 of 254 Data sets (85%) have been submitted or linked. 204 are available on-line (11 in progress)

• Field Catalog (w/reports and preliminary products) is on-line

• Data submission instructions and guidelines are available on-line

• Upper Air Composites (hi-res/5 hpa) are available on-line

• Surface Composites to be available Fall 2003

(TRICK or TREAT!)

• For details see: http://www.joss.ucar.edu/ihop/dm/