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USGS Earth Resources Observation and Science Center (EROS)

Data Management Quality Assurance Procedures

1. A quality verification program is run immediately after each metadata transfer to the AVPDB to identify data and processing problems. Information that is output from subprograms includes:

a. duplicate scene identifiers

b. acquisitions per day (total, network, local, and 1 KM)

c. scenes entered per day (total, network, local, and 1 KM)

d. total scenes and total 1 KM scenes received from each station

e. acquisition year error for DOMSAT and local acquire

f. duplicate or overlapping coverage by same station

g. duplicate data base record transfer from processing system

h. scenes without reference aid id after elapsed time

i. scenes without media storage location

j. scenes with excessively short or long pass duration

k. geographic coordinates beyond range of receiving station

l. scenes with reference aid id with incorrect microfiche set code

m. scenes with invalid receiving method

n. receiving station mismatch between AVPDB, tape receipt, and processing logs.

Each subprogram will output specific information necessary to determine the cause of the anomaly. Independent programs have been developed to assist in resolving data and processing problems.

2. A coverage verification program is run periodically to report less than expected coverage by each receiving station. For dates with less than expected passes recorded the number and identification of scenes or passes archived is listed. The output is in the form of correspondence to the receiving stations and includes total scenes and tapes received and the range of acquisition dates.

3. Daily and Weekly LAC plots are plotted and distributed on a weekly basis.

4. Receiving station coverage circle plots are plotted periodically.

5. Plots by selected receiving station(s) are generated when necessary.

6. The number of scenes expected on each tape vs. the number of scenes acquired, ingested, and processed through reference aid generation is tracked by the DATE MANAGEMENT tape receipt data base. Anomolies are output to the common error file.

7. When a station's data is being ingested for the first time or their has been historical problems with a station's data, the microfiche images can be examined directly from the SGS4 disk using an X terminal. Systematic image data defects and linework misalignment are indicators of data problems.

8. A world plot of LAC and HRPT coverage by day will be useful for spotting gaps in coverage.

9. Line drops, linework placement, and image defects will be examined on the microfiche. The fiche will normally be available within 1 day of ingest.

10. DATE MANAGEMENT will delete 1 Kilometer scenes only if there is no visible land area or the scene is a duplicated by the same receiving station.

Quality Assurance Tools Employed by DM:

1. Cam Plots
2. GLIS
3. Microfiche
4. AVPDB SQL
5. xid
6. xloadimage
7. Valid Tests on Ingest
8. xlasdsp
9. coverage verification program
10. quality verification programs

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U.S. Department of the Interior | U.S. Geological Survey URL: http://edcsns17.usgs.gov/1KM/quality.html Page Contact Information: custserv@usgs.gov Page Last Modified: Wednesday August 24, 2005