Keying Great Lakes Water Levels

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• Keying Great Lakes Water Levels

Stephen D. Lyles
NATIONAL OCEAN SERVICE Center for Operational
Oceanographic Products and Services (CO-OPS)
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Water Levels on the Great Lakes

• Published Since 1860
• Uses of Archived data

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Great Lakes NWLON Stations
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Project Goals

• Digitize Archived Data
• Data available on CO-OPS Web Page

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Data Set Description

• Quantity
• 1,400 Station Years of data
• (12.9 million entries)
• Media
• Water Level Books
• Tabular Pages

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Required Rescue Activity

• Key Data
• Quality Control Check
• Compute Means
• Determine Maximum Minimum Values
• Compare computed data to keyed data

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Deliverables

• Data Files on CD
• Hourly
• Daily Mean
• Monthly Mean
• Maximum Values
• Minimum Values
• Discrepancy Report

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Data Format - Hourly Values

• File Name - gggg_yyy.HLY
• e.g. 5014_955.HLY
• Line of Data
• 1 2 3
• 123456789012345678901234567890
• 1955 1 31 24 581.00
• 1955 2 1 1 581.13

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Data Format - Daily Mean Values

• File Name - gggg_yyy.DLY
• e.g. 5014_955.DLY
• Line of Data
• 1 2
• 1234567890123456789012345
• 1955 1 31 581.10
• 1955 2 1 581.16

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Data Format - Monthly Mean Values

• File Name - gggg_yyy.MON
• e.g. 5014_955.MON
• Line of Data
• 1 2
• 12345678901234567890
• 1955 1 581.20
• 1955 2 581.00

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Data Format - Maximum Values

• File Name - gggg_yyy.MAX
• e.g. 5014_955.MAX
• Line of Data
• 1 2 3
• 123456789012345678901234567890
• 1955 1 3 228 581.77
• 1955 2 12 1125 581.51

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Data Format - Minimum Values

• File Name - gggg_yyy.MIN
• e.g. 5014_955.MIN
• Line of Data
• 1 2 3
• 123456789012345678901234567890
• 1955 1 21 1340 580.37
• 1955 2 5 1310 580.22

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Data Format - Discrepancy Report

• File Name - gggg_yyy.REP
• e.g. 5014_955.REP
• Line of Data
• 1 2 9
• 12345678901234567890123...4567890
• 1955 11 Descriptive Text

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NOS Responsibilities

• Resolve Discrepancies
• Adjust Datum
• Access via WEB

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Projected Costs

• 1 COTR (80 hrs. _at_ 44.52) 3,562
• 1 Preparer (80 hrs. _at_ 29.47) 2,358
• 2 Reviewer (500 hrs. _at_ 19.25) 9,625
• Keying 400,000
• Total 415,545

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