7 Unihedron Device Manager
Figure 7.17: RSE algorithm
We have been using a 90-minute time span as shown in the Figure above. The RSE value is assigned to the point in
the middle of the time span. The time window advances one time step (typically 5 minutes in our data files) and the fit
is calculated for the new center point, etc.
This algorithm processes one day of data at a time. Assuming a 5-minute sample spacing in time, there are at most
288 samples per day, so arrays are dimensioned to 300; attempts to process SQM data with time spacing that provides
more than 300 samples per day will fail.
The Range parameter is the number of samples (usually 5 minutes apart) to include before and after the current point
at which the Residual Standard Error of regression calculation is performed; the full width of the interval in terms of
number of points to consider in the calculation is (2*Range + 1) so that a Range of 6 incorporates a time span of 60
minutes and a Range of 9 evaluates to a 90 minute span.
Additional Notes:
1. If the Latitude and Longitude are not specified in the input .dat file, processing will stop.
2. If the Location name is not specified in the input .dat file, the location name will be printed in the output .csv file
as “Not-Specified”.
40
Unihedron SQM-LU-DL Operator’s Manual -
20220119
Summary of Contents for SQM-LU-DL
Page 2: ......
Page 17: ...17...
Page 19: ...Figure 4 1 Front and back of of unit Unihedron SQM LU DL Operator s Manual 20220119 19...
