IMAGENEX DT101Xi, Техническое руководство

Страница: 30 / 64

Doc no: 430-041-01 30 of 64
Figure 4-9 Reference surface lines
4.4.2. Check lines
A new sound velocity cast within the reference surface area should be undertaken.
A pair of parallel lines (>300m long), inside the reference surface should be run as shown in Figure 4-10.
Inter-swath overlap is not required.
Vessel speed should be as per the reference model and data logged to a separate location or filename than
the reference model.
Figure 4-10 Check lines
4.4.3. Processing Performance Test
The post-processing of these data sets is done in two steps namely:
•
Data cleaning
•
Gridding and differencing
The reference surface represents the ground truth data and should be free of biases and outliers. Check lines
will be used to verify the overall performance of the MBES system and thus thinning and/or smoothing is
avoided. During differencing, check lines should be processed one at a time and the quality of data assessed
for each line.