Vemco HR2, User Manual

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187
D
HR2 Data Export Detection Filters
Fathom uses some filtering criteria on detection data from HR2 receivers when they are
converted from VDAT to CSV format.
D.1 Quality Score Filter
Only HR detections with a Quality Score of 3 or higher are included in the CSV output. This is to help
minimize the number of false detections that appear in the CSV file. In systems with high numbers of
animals present and in highly reflective acoustic environments, detection data could become cluttered
with high numbers of false detections. This filter minimizes the inclusion of poor quality data in the
output file, and keeps the CSV file sizes as small as possible.
D.2 HR Residency Filter
A second filter that is applied to HR Detection data upon conversion from VDAT to CSV is the HR
Residency Filter
. This filter rejects HR detections of a given ID that are not duplicated within one hour
of each other . While false HR detections can be relatively common in some acoustic environments, they
do not typically repeat themselves within short periods of time. The purpose of this filter is to minimize
the number of false detections appearing in the CSV output.
The number of detections discarded by the HR Residency filter and the Quality Score filter is listed in
the DET_FILTER record in your CSV file under the filter name "HR Combined", in the
Rejected
Detections column.
Figure D-1: Filtered/Rejected Detections
The filters described above are not applied to the live views (
Live Tiles
,
Live Detections
, and
Status
tabs) in Fathom when connected to an HR2 receiver.