(IVAR) - Final Report - Strategic Environmental Research and ...

We selected one hour (20:00-21:00 UTC on 12 September 2009) of plots and tracks data selected
from the SEAAR2u rooftop radar at SEA. We had previously determined in the demonstration
of SC2.1 (Section 6.3.1.6) that all track updates from 12 September 2009 existed in both the
DRP and RDS datasets. We did not, therefore, need to identify 300 matching track updates. We
instead used the full one-hour set of 2313 track updates records, which corresponded to a total of
25,443 field-by-field comparison. Table 6-24 lists the 11 fields compared between each of the
2313 track update records.
Table 6-24. The 11 fields used in the comparison of track update records. Excerpt is from the
DRP dataset.
Date Track ID Update Time Intensity Range (m) Azimuth (deg.) Height(m) Heading (deg.N) Speed (m/s) Latitude Longitude
9/12/2009 177 59:47.6 1295 789.77 250.9 55.1 118.7 7.9 47.4394 ‐122.3104
9/12/2009 177 59:49.9 925 777.37 249.9 54.2 118.7 7.9 47.4393 ‐122.3102
9/12/2009 177 59:52.2 1188 765.62 248.9 53.4 118.6 7.9 47.4392 ‐122.31
We wrote the following formula in Microsoft Excel® to compare the 11 fields in the records
from the DRP and RDS datasets:
=IF(From_DRP!A1=From_RDS!A1,0,1)
This comparison returned a ‘0’ if a match was found between corresponding fields in the
‘From_DRP’ and ‘From_RDS’ datasets, or a ‘1’ if a difference was found. We summed the
results from the 25,443 comparisons to calculate the percentage of data errors between the two
datasets.
Results
Our 5% success criterion corresponds to fewer than 1273 errors out of the 25,443 field-by-field
comparisons of the 2313 track updates included in the DRP and RDS datasets from the
SEAAR2u radar at SEA. Table 6-25 is a summary of the results of those comparisons.
Table 6-25. Differences found in a field-by-field comparison of the DRP and the RDS datasets
generated from the SEAAR2u radar between 20:00-21:00 UTC on 12 September 2009 .
Datasets from
SEAAR2u at SEA
Number of
Fields
RDS at ARTI 25,443
DRP at SEA 25,443
Differences
Found
Percent Data Errors
(%)
0 0
As can be seen in Table 6-25, there were no errors (100% data integrity) in the 25,443 field-byfield
comparisons from the two datasets used in this demonstration.
200