sherzodr/libpenmon

Implements weather station class in C++ that calculates ETo based on Penman-Monteith equation

NAME

libpenmon - Implements weather station in C++ that supports ETo calculation.

SYNOPSIS

#include "libpenmon.h"
#include <iostream>

int main(void) {
    Station station(41.42, 109);
    StationDay day238 = station.day(238, station);
    day238.temp_min=19.5;
    day238.temp_max=29.5;
    std::cout << "ETo is " << day238.eto() << "mm\n";
    return 0;
}

WARNING

This library is work-in-progress. Proceed with caution!

INSTALL

./configure
make
make install

It also includes example.cpp file. You can compile the program by doing:

make example

It will generate an executable file example in your current folder.

LINKING WITH LIBPENMON

This is how I compile and link source code that uses libpenmon:

g++ source_code.cpp -lpenmon

If compiler complains saying -lpenmon is not found, you should provide the library path where you installed it:

g++ -L"your/lib/path" source_code.cpp -lpenmon

In case it cannot find libpenmon.h header file, direct it to the location of the header file:

g++ -I"your/include/path" -L"your/libpath" source_code.cpp -lpenmon 

DESCRIPTION

Implements a weather station class (Station) that calculates ETo (reference evapotranspiration) given climate data. Based on Penman-Monteith equation as detailed in UN-FAO's "Irrigation and Drainage Paper 56".

CLASSES

libpenmon implements few classes to accomplish it's mission as intuitively as possible:

Station

This is the main class that holds other classes together. It can either accept two arguments, latitude and altitude of the location:

Station station_in_uzb(41.42, 109)

or three arguments, latitude, altitude and anemometer_height:

Station station_in_uzb(41.42, 109, 10)

If the third argument is missing it defaults to 2

StationDay

This class represents a single entry related to the Station. All of the heavy-lifting happens in this class. It's also responsiblel to calculate ETo:

StationDay day138=station_in_uzb.get_day(138);
day138.temp_min=26.5;
day138.temp_max=38.5

float eto = day138.eto();

Crop

This class represents a crop, against which evapotranspiration is calculated. if you do not set any crop details library defaults to reference crop as detailed in the original paper.

Client

Algorithms detailed in the paper are able to make assumptions regarding the climate to recreate missing data. To make these assumptions it relies on Client class. If you do not instantiate this class it creates a default climate class.

SEE ALSO

libpenmon started off as a port of penmon.eto Python module. You should refer to that module to learn more about this library. Method and classnames are preserved as is.

AUTHOR

Sherzod B. Ruzmetov [email protected]