Description Usage Arguments Details Value
Compute (longitudinal) (cumulative) change from survey data.
1 2 3 4 5 |
d |
The cross section data, i.e. output of |
time.col |
The column containing time stamps. |
station.col |
The column containing cross section station IDs. |
distance.col |
The column containing cross section distances. |
elevation.col |
The column containing cross section elevations. |
bank.stations |
A table defining the bank station distances to use when
computing cross section area. If |
reference.elevation |
Use predefined reference elevations when computing
cross section area. Can be a constant or a two column station of cross
section labels and associated reference elevation. If |
station.lengths |
The cross section length values. |
over.time |
If |
longitudinal |
If |
direction |
Accumulate data in the downstream (descending order of cross
section IDs) or upstream (ascending order) direction. Ignored if
|
This function performs similarly to xs_cumulative_change
but
is designed to work with survey data rather than RAS outputs. The primary
difference is that this function allows the computation of longitudinal
cumulative change when some surveys are incomplete. The function recomputes
the station lengths for each survey based on what cross sections are
present in the survey. The longitudinal cumulative volume is then computed
with missing stations omitted from the data.
A wide-format table of (accumulated) change. The output data will contain NA values where stations are missing from surveys, but the change
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