Smart Systems User’s Manual Version 1.1
79
Grid Dimensions
For grid data acquisition, the grid size needs to be specified. The user needs to input
the length of the X dimension and the length of the Y dimension. The dimensions
entered are assumed to be in the same units as the Position Units (see Section 6.3.1),
i.e. metres or feet.
On this screen the user needs to highlight the dimension to be changed. The user can
toggle between the X and Y fields by pressing the X/Y button.
The dimension value is incremented or decremented by pressing the +Line or –Line
buttons. The dimension value will change by a value equal to the current Line Spacing
in that dimension.
For example, if the Line Spacing (see below) in the X direction is 0.5 metres, the grid
dimension in the X direction will increment or decrement in 0.5 metre intervals.
Note that the maximum number of lines that can be collected in each direction is
100. Therefore, the X and Y grid dimensions cannot be set to a value that will
result in more than 100 lines being collected.
For example, if the Line Spacing between Y lines (defined as lines parallel to the Y axis)
is set to 0.25 metres, the maximum X dimension is (100-1) X 0.25 = 24.75 metres. (One
is subtracted because the first line is at position 0.0 metres.)
To increase the X dimension value, the Y line spacing must be increased. Using the
example above, if the Y Line Spacing is increased to 0.30 metres then the maximum X
dimension is (100-1) X 0.30 = 29.70 metres.
If the Grid Type is set to X Lines only or Y Lines only (see Section 6.3.4), the length of
those lines are not restricted by the Line Spacing parameter of the opposite dimension.
That is why if an X Lines only grid is selected, the X dimension can be input as a value
rather than an increment of the Y Line Spacing. Similarly, if a Y Lines only grid is
selected, the Y dimension can be input as a value rather than an increment of the X Line
Spacing.
Line Spacing
For grid data acquisition, the distance between survey lines needs to be specified.
If the grid type is X Lines only (see Section 6.3.4) then the spacing between the X lines
needs to be input.
If the grid type is Y Lines only (see Section 6.3.4) then the spacing between the Y lines
needs to be input.
If the grid type is XY Lines (see Section 6.3.4) then the spacing between the X lines and
Y lines need to be input. The line spacing can be different. The user can toggle between
the X line spacing and Y line spacing fields by pressing the X/Y button.
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