flightgear/src/WeatherCM/FGWeatherParse.cpp

/*****************************************************************************

 Module:       FGWeatherParse.cpp
 Author:       Christian Mayer
 Date started: 28.05.99
 Called by:    FGMicroWeather

 -------- Copyright (C) 1999 Christian Mayer (fgfs@christianmayer.de) --------

 This program is free software; you can redistribute it and/or modify it under
 the terms of the GNU General Public License as published by the Free Software
 Foundation; either version 2 of the License, or (at your option) any later
 version.

 This program is distributed in the hope that it will be useful, but WITHOUT
 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
 FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
 details.

 You should have received a copy of the GNU General Public License along with
 this program; if not, write to the Free Software Foundation, Inc., 59 Temple
 Place - Suite 330, Boston, MA  02111-1307, USA.

 Further information about the GNU General Public License can also be found on
 the world wide web at http://www.gnu.org.

FUNCTIONAL DESCRIPTION
------------------------------------------------------------------------------
Parse the weather that can be downloaded from 

    http://129.13.102.67/out/flight/yymmddhhdata.txt.gz

where yy stands for the year, mm for the month, dd for the day and hh for the
hour.
The columns are explained at

    http://129.13.102.67/out/flight/kopf.txt

and a list of the stations can be found at

    http://129.13.102.67/out/flight/wmoconv.txt.gz

Many thanks to Georg Mueller (Georg.Mueller@imk.fzk.de) of the 

    Institut fuer Meteorologie und Klimaforschung, Universitaet Karlsruhe

for makeking such a service aviable. 
You can also visit his homepage at http://www.wetterzentrale.de

HISTORY
------------------------------------------------------------------------------
18.10.1999 Christian Mayer	Created
*****************************************************************************/

/****************************************************************************/
/* INCLUDES								    */
/****************************************************************************/
#include "Include/fg_constants.h"

#include "FGWeatherParse.h"
#include "FGWeatherUtils.h"

/****************************************************************************/
/********************************** CODE ************************************/
/****************************************************************************/

FGWeatherParse::FGWeatherParse()
{
}

FGWeatherParse::~FGWeatherParse()
{
}

void FGWeatherParse::input(const char *file)
{
    unsigned int nr = 0;

    fg_gzifstream in;

    cerr << "Parsing \"" << file << "\" for weather datas:\n";
    
    in.open( file );

    while ( in )
    {
	entry temp;

	in >> temp.year; 
	in >> temp.month; 
	in >> temp.day; 
	in >> temp.hour; 
	in >> temp.station_number; 
	in >> temp.lat; 
	in >> temp.lon; 
	in >> temp.x_wind; 
	in >> temp.y_wind; 
	in >> temp.temperature; 
	in >> temp.dewpoint; 
	in >> temp.airpressure; 
	in >> temp.airpressure_history[0]; 
	in >> temp.airpressure_history[1]; 
	in >> temp.airpressure_history[2]; 
	in >> temp.airpressure_history[3]; 

	weather_station.push_back( temp );

	// output a point to ease the waiting
	if ( ((nr++)%100) == 0 )
	    cerr << ".";
    }

    cerr << "\n" << nr << " stations read\n";
}

FGPhysicalProperties2D FGWeatherParse::getFGPhysicalProperties2D(const unsigned int nr) const
{
    FGPhysicalProperties2D ret_val;

    //chache this entry
    entry this_entry = weather_station[nr];
    
    //set the position of the station
    sgSetVec2( ret_val.p, this_entry.lat * DEG_TO_RAD, this_entry.lon * DEG_TO_RAD ); 

    ret_val.Wind[-1000.0]          = FGWindItem(this_entry.x_wind, this_entry.y_wind, 0.0);
    ret_val.Wind[10000.0]          = FGWindItem(this_entry.x_wind, this_entry.y_wind, 0.0);
    ret_val.Temperature[0.0]       = Celsius( this_entry.temperature );
    ret_val.AirPressure            = FGAirPressureItem( this_entry.airpressure * 10.0 );    //*10 to go from 10 hPa to Pa

    //I have the dewpoint and the temperature, so I can get the vapor pressure
    ret_val.VaporPressure[-1000.0] = sat_vp( this_entry.dewpoint );
    ret_val.VaporPressure[10000.0] = sat_vp( this_entry.dewpoint );

    //I've got no ideas about clouds...
    //ret_val.Clouds[0]              = 0.0;
    
    return ret_val;
}