Triton Bathymetry - Manual (Page 37)

Page 33
A few things to note:
 The bathy profile tool works for any grid layer including the QC layers generated
during gridding (density, standard deviation, etc.).
 The cursor position in the profile is linked to the map view. In the images at the
bottom of the previous page the cursor position in the profile is shown as a green
circle (color of selected line) and this same position is displayed in the map view
along the profile line.
 The cursor position in the profile window uses the Custom Cursor projection and can
be set to any projection using the button next to the position read-out.
8.3 Bathy QC Layers
During bathymetry processing it is possible to create additional QC layers for assessing
the quality of the determined value for each grid cell. The QC layers are selected in the
BathyOne wizard and vary depending on the selected gridding method, DTM or CUBE.
8.3.1 DTM – Density Layer
The number of soundings used
for each grid cell for creating
the DTM grid is displayed
graphically in the map view and
also listed in file tree. The
example shown here has most
of the grid cells with less than
10 soundings per cell. The file
tree displays the number of
grid cells that have that
number of soundings. For
example, there are 34924 grid
cells with 7 soundings. The map
view of the density layer shows the highest density is where the lines overlapped.
Generally to have confidence in the grid cell depth value, it is best to have at least 5
soundings in the grid cell. Looking at the density layer or the file tree color map shows
that this DTM does not meet these requirements and was gridded at too high a resolution.
0.5m grid