Observations.
Observation files are selected using the Observations feature from the CRHM pull down menu. Multiple files may be selected but the first file specified determines the maximum modeling period and the time step used by the model. Later files will be skipped over to the start time of the first file and may end earlier than the first file. Later files need not have the same frequency as the first file. The data in the later files may also be discontinuous (sparse). When the model is saved as a project all the observation file names are saved with the model in the project file.
NOTE: At any point during the operation of the model, the user can check the lower left hand corner box of the CRHM window to automatically view the status of the program. This box will also identify and describe the feature on the CRHM window that the cursor is pointing to.
Selecting Observations from the main menu gives the following choices,
Open.
Opens an Observation File. When an observation file is opened all the observation data names defined in the file are displayed in the Observation listbox. When any of the names are selected, the description of the data if given in the data file is displayed in the status box followed by the file name. When an observation file is opened, its name is added to the observation menu list. The file may be closed by selecting the file name on the menu list.
CloseAll.
Closes all open observation files.
Displaying Observations.
If an observation is selected and right clicked a menu pops up allowing the observation to be added to the Selected listbox. Observations listed in the Selected listbox are immediately displayed on the chart.
Formats for displaying Data.
Observation - interval data.
VP_saturated - Saturated vapour pressure for temperature
W_to_MJ - the data is converted from Watts to Mega Joules per time interval.
MJ_W - the data is converted from mega Joules per time interval to Watts.
Average - daily average value.
Minimum - daily minimum value.
Maximum - daily maximum value.
Daily Sum - sum of daily interval values.
Positive - sum of daily interval values that are greater than zero.
Total - total of interval values over run period
First - displays data once at the beginning of the day.
Last - displays data once at the end of the day.
Peak - peak value over period.
Count - number of intervals when the value is non zero.
Count0 - number of intervals when the value is zero.
Delta - change in the variable over the period. For the first period, the first value is used as the datum. Thereafter, the last value of the last period is used.