If you already have already performed the parameterizaton and have an existing ClimGen location parameter file you can go directly to Generate data otherwise you will need to perform the parameterization using an existing UED file containing historial weather data.
ClimGen requires historial daily weather data to perform parameterization. When the parameterization wizard is started, the /Database\ page will be displayed. A database file containing the daily weather data must be selected.
ClimGen reads daily weather data from a Universal Environmental Database (UED) file.
If you already have prepared a UED database file press the [Browse] button and select the file using the file requestor bar.
If you have not yet prepared a UED database file, there are two ways to enter the weather data into a UED file:
To use the import utility:
To create a new UED database:
Note that you can use the [Edit UED file] to edit the existing selected UED file at any time.
Sometimes it is desirable to perform statistical analysis on a subset of the data. You can select the period of time and the variables to be analyzed. This option is convenient when testing ClimGen's ability to generate data given different combinations available data. In previous versions of ClimGen this required making copies of data files and laboriously stripping of unwanted data using text editors or spreadsheets.
Note that during parameterization, ClimGen will always exclude data which is missing, out of bounds, or otherwise invalid or not real, this includes data marked as estimated, forcasted, or generated, or computed from such data.
The new checkbox under "Advanced options" allows estimated and generated data to be included in in analysis. Normally this should be disabled. Some times for special circumstances it may be necessary to presume that estimated and/or generated data present in the database should be considered as if it were real weather data. This may be the case when using the CropSyst Suite weather station interpolator. This may also be necessary when the raw weather data includes interpolated data values that could be considered as expert derived real weather data.
Click the button [Run the analysis of available weather and generate parameters]
This may take several minutes to complete. The analysis performed will depend on the data that is available in the daily weather files.
For example, Clear sky transmission coefficient and B parameter for solar radation will not be calculated if solar radiation data is not in the weather files or if there are a not sufficient number of days of solar radiation to give reliable parameters for estimating solar radiation.
Similarly, Aridity factor will not be computed if there are not sufficient days of valid relative humidity data.
To enable this option monthly mean 30 minute half hour precipitation it required.
If not using the storm event generation option, enter 0.0 for all fields on this page.
The button [Calculate from historial precipitation data (if available)] Can be used to the caluclation of these values, if 5,10, 15 or 30 minute precipition data is present in the UED file.