Weather Data Replacement.

apsimNGpy provides both an object oriented structure and procedural structure to replace the weather data. Here, I only demonstrate the object oriented one.

Get weather data from the web

Replace instantly from the instantiated apsimNGpy model object. This is achieved with get_weather_from_web() with the following signature;

get_weather_from_web(lonlat: tuple, start: int, end: int, simulations=MissingOption, source='nasa',
                            filename=None)

lonlat: tuple containing the longitude and latitude coordinates in that order.

start: Start date for the weather data retrieval.

end: End date for the weather data retrieval.

simulations: str, list of simulations to place the weather data, defaults to all simulation if user specification is missing.

source: Source of the weather data. Defaults to ‘nasa’ because its world wide coverage, but other sources includes the daymet (Contiguous U.S. Only)

filename: Name of the file to save the retrieved data. If None, a default name is generated.

To use get_weather_from_web(), it requires instantiation of the model as follows;

from apsimNGpy.core.apsim import ApsimModel
maize_model = ApsimModel(model='Maize') # replace maize with your apsim template file

# replace the weather with lonlat specification as follows;
maize_model.get_weather_from_web(lonlat = (-93.885490, 42.060650), start = 1990, end  =2001)

Warning

Changing weather data with non matching start and end dates in the simulation will lead to RuntimeErrors. To avoid this first check the start and end date before proceeding as follows.

dt = maize_model.inspect_model_parameters(model_type='Clock', model_name='Clock', simulations='Simulation')
start, end = dt['Start'].year, dt['End'].year
# out put:  1990, 2000

Using local weather data

Got weather data stored on your computer? No problem! With apsimNGpy, you can easily swap in your own weather file using the get_weather_from_file() method. Here’s how you can do it. In the same way as - get_soil_from_web(),

Hint

If no simulation is specified, all available simulations will get the suggested weather file

maize_model.get_weather_from_file(weather_file = './pathtotheeatherfile')

See also

Related APIs:

See also