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Re: [Orekit Users] orekit and Jython

To: orekit-users@orekit.org
Subject: Re: [Orekit Users] orekit and Jython
From: beowulf zhang <beowulf.zhang@gmail.com>
Date: Fri, 20 May 2011 23:00:38 +0800
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In-reply-to: <BAY164-w2791EF23B3D4036D9984DBD58E0@phx.gbl>
References: <FECF5338-38C5-44B9-9206-182300A2CEAC@gmail.com> <BANLkTikMEk7jc-nvc-b0ebuvoaVBA0EKfw@mail.gmail.com> <20110519094630.38174ueiadnjewgm@messagerie.si.c-s.fr> <BAY164-w2791EF23B3D4036D9984DBD58E0@phx.gbl>

I'm working in Matlab 7.7, I want to test your code, I have seted the
orekit's and common-math's classpath in classpath.txt, but I get error
message

??? Undefined variable "TimeScalesFactory" or class "TimeScalesFactory.getUTC".

Error in ==> orekit_test1 at 42
utc = TimeScalesFactory.getUTC();

whether you can help me or not?
Thank you!

2011/5/19, Brian H <brianh4321@hotmail.com>:
>
> Concerning the matlab interface(?)
>
> While its somewhat crude, here is my early test script of the first
> tutorial. If I remember correctly you have to set the orekit data path using
> the System call below. There was also a problem with matlab's imported
> version of
> the commons-math library being somewhat out of date. This was fixed
> by downloading the current version and adding that directory at the top of
> your classpath.txt located in the MATLAB directory. Anyway, here is a copy
> of the original mfile. It was
> my first attempt at the matlab-java interface, pardon it's crudeness it was
> meant as
> an exercise.
>
>
> import java.lang.*
> import java.lang.Enum
> import java.text.*
> import java.util.*
>
> import org.apache.commons.*
> import org.apache.commons.math.*
> import org.apache.commons.math.geometry.*
> import org.apache.commons.math.util.*
> import org.apache.commons.math.util.MathUtils.*
> import org.orekit.bodies.*
> import org.orekit.bodies.BodyShape.*
> import org.orekit.bodies.GeodeticPoint.*
> import org.orekit.bodies.OneAxisEllipsoid.*
> import org.orekit.errors.OrekitException.*
> import org.orekit.frames.*
> import org.orekit.frames.Frame.*
> import org.orekit.frames.FramesFactory.*
> import org.orekit.frames.TopocentricFrame.*
> import org.orekit.frames.LocalOrbitalFrame.*
> import org.orekit.orbits.*
> import org.orekit.orbits.CartesianOrbit.*
> import org.orekit.orbits.Orbit.*
> import org.orekit.propagation.*
> import org.orekit.propagation.Propagator.*
> import org.orekit.propagation.analytical.*
> import org.orekit.propagation.analytical.KeplerianPropagator.*
> import org.orekit.time.*
> import org.orekit.time.AbsoluteDate.*
> import org.orekit.time.TimeScale.*
> import org.orekit.time.TimeScalesFactory.*
> import org.orekit.utils.*
> import org.orekit.utils.PVCoordinates.*
> import org.orekit.data.*
> import org.orekit.data.DataProvidersManager.*
> import LOFTypeWrapper
> System.setProperty('orekit.data.path','orekit-data')
>
>
> symbols = DecimalFormatSymbols(Locale.US);
> d3 = DecimalFormat('0.000', symbols);
> utc = TimeScalesFactory.getUTC();
> initialDate = AbsoluteDate(2008, 10, 01, 0, 0, 00.000, utc);
> mu =  3.986004415e+14; % gravitation coefficient
> inertialFrame = FramesFactory.getEME2000();
> posisat = Vector3D(-6142438.668, 3492467.560, -25767.25680);
> velosat = Vector3D(505.8479685, 942.7809215, 7435.922231);
> pvsat = PVCoordinates(posisat, velosat);
> initialOrbit = CartesianOrbit(pvsat, inertialFrame, initialDate, mu);
> kepler = KeplerianPropagator(initialOrbit);
> lof = LocalOrbitalFrame(inertialFrame, LOFTypeWrapper.getType(1), kepler,
> 'LOF');
> ae =  6378137.0; % equatorial radius in meter
> f  =  1.0 / 298.257223563; % flattening
> ITRF2005 = FramesFactory.getITRF2005(true); % terrestrial frame at an
> arbitrary date
> earth = OneAxisEllipsoid(ae, f, ITRF2005);
>
> % Station
> longitude = Math.toRadians(45.);
> latitude  = Math.toRadians(25.);
> altitude  = 0.;
> station = GeodeticPoint(latitude, longitude, altitude);
> staF = TopocentricFrame(earth, station, 'station1');
> System.out.println('          time           doppler (m/s)');
> finalDate = AbsoluteDate(initialDate, 6000, utc);
> extrapDate = initialDate;
> while (extrapDate.compareTo(finalDate) <= 0)
>
>     % We can simply get the position and velocity of station in LOF frame at
> any time
>     pv = staF.getTransformTo(lof,
> extrapDate).transformPVCoordinates(PVCoordinates.ZERO);
>
>     % And then calculate the doppler signal
>     doppler = Vector3D.dotProduct(pv.getPosition(), pv.getVelocity()) /
> pv.getPosition().getNorm();
>     abc= d3.format(doppler);
>     def= String('     ');
>     ghi= extrapDate.toString();
>     jkl= ghi.concat(def.concat(abc));
>     System.out.println(jkl);
>
>     extrapDate = AbsoluteDate(extrapDate, 600, utc);
>
> end
>
>
>
>> Date: Thu, 19 May 2011 09:46:30 +0200
>> From: luc.maisonobe@c-s.fr
>> To: orekit-users@orekit.org
>> Subject: Re: [Orekit Users] orekit and Jython
>>
>> beowulf zhang <beowulf.zhang@gmail.com> a écrit :
>>
>> > Very good! Thank you...
>> >
>> > I konw the m language of Matlab support java programming now, but I
>> > was failure to test the orekit examples. I want to know whether anyone
>> > are interesting testing the orekit examples in Matlab or not.
>>
>> If you want to test these examples, I would be interested to know if
>> they work.
>> We could set up some wiki pages (yes, we know, the wiki is quite empty
>> for now) showing how to interface with several scripting languages.
>>
>> Luc
>>
>> >
>> >
>> > 2011/5/17, Petrus Hyvönen <petrus.hyvonen@gmail.com>:
>> >> Hi all,
>> >>
>> >> I was playing around with the idea of using Python for mission design,
>> >> and
>> >> found Jython and the orekit library. As new to both Python and Java, I
>> >> had
>> >> some initial troubles of getting things to work, primary the access to
>> >> orekit-data, what was current dir and javapaths etc. I am now using
>> >> Eclipse
>> >> with pydev extension, and can add the orekit jars and orekit-data to
>> >> the
>> >> eclipse project.
>> >>
>> >> As an exercise I took the liberty to translate a few of the orekit
>> >> examples
>> >> from java to jython, and copy them below as it could be of interest for
>> >> others. I have been exploring scipy before (based on regular python)
>> >> and it
>> >> contains very good plotting and array routines, which is not available
>> >> in
>> >> jython. So next step would be to find a suitable java plotting and
>> >> arrays
>> >> library to be able to represent the results.
>> >>
>> >> Regards
>> >> /Petrus
>> >>
>> >> First, a jython translation of the SlaveMode.java:
>> >> __________________________________________
>> >>
>> >> # -*- coding: utf-8 -*-
>> >> '''
>> >> /* Copyright 2002-2010 CS Communication & Systèmes
>> >>  * Licensed to CS Communication & Systèmes (CS) under one or more
>> >>  * contributor license agreements.  See the NOTICE file distributed
>> >> with
>> >>  * this work for additional information regarding copyright ownership.
>> >>  * CS licenses this file to You under the Apache License, Version 2.0
>> >>  * (the "License"); you may not use this file except in compliance with
>> >>  * the License.  You may obtain a copy of the License at
>> >>  *
>> >>  *   http://www.apache.org/licenses/LICENSE-2.0
>> >>  *
>> >>  * Unless required by applicable law or agreed to in writing, software
>> >>  * distributed under the License is distributed on an "AS IS" BASIS,
>> >>  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
>> >> implied.
>> >>  * See the License for the specific language governing permissions and
>> >>  * limitations under the License.
>> >>  */
>> >>
>> >> Translated from SlaveMode.java to jython by Petrus Hyvönen 2011-05-04
>> >> '''
>> >>
>> >> # orekit.jar,orekit-data.zip and commons-maths in CLASSPATH through
>> >> eclipse
>> >> project
>> >> import java, os
>> >>
>> >> from org.orekit.errors import OrekitException
>> >> from org.orekit.frames import Frame
>> >> from org.orekit.frames import FramesFactory
>> >> from org.orekit.orbits import KeplerianOrbit
>> >> from org.orekit.orbits import Orbit
>> >> from org.orekit.propagation import SpacecraftState
>> >> from org.orekit.propagation.analytical import KeplerianPropagator
>> >> from org.orekit.data import DataProvidersManager
>> >> from org.orekit.data import ZipJarCrawler
>> >> from org.orekit.time import AbsoluteDate
>> >> from org.orekit.time import TimeScalesFactory
>> >>
>> >> from math import radians
>> >>
>> >> # Configure Orekit. The file orekit-data.zip must be in current dir
>> >> DM = DataProvidersManager.getInstance()
>> >> crawler=ZipJarCrawler("orekit-data.zip")
>> >> DM.clearProviders()
>> >> DM.addProvider(crawler)
>> >>
>> >> #Initial orbit parameters
>> >> a = 24396159    # semi major axis in meters
>> >> e = 0.72831215  # eccentricity
>> >> i = radians(7.0)# inclination
>> >> omega = radians(180) # perigee argument
>> >> raan = radians(261) #right ascension of ascending node
>> >> lM = 0.0 # mean anomaly
>> >>
>> >> #Inertial frame
>> >> inertialFrame = FramesFactory.getEME2000()
>> >>
>> >> #Initial date in UTC time scale
>> >> utc = TimeScalesFactory.getUTC();
>> >> initialDate = AbsoluteDate(2004, 01, 01, 23, 30, 00.000, utc)
>> >>
>> >> #gravitation coefficient
>> >> mu =  3.986004415e+14
>> >>
>> >> #Orbit construction as Keplerian
>> >> initialOrbit = KeplerianOrbit(a, e, i, omega, raan, lM,
>> >>                               KeplerianOrbit.MEAN_ANOMALY,
>> >>                               inertialFrame, initialDate, mu)
>> >>
>> >> #Simple extrapolation with Keplerian motion
>> >> kepler = KeplerianPropagator(initialOrbit)
>> >>
>> >> #Set the propagator to slave mode (could be omitted as it is the
>> >> default
>> >> mode)
>> >> kepler.setSlaveMode()
>> >>
>> >> #Overall duration in seconds for extrapolation
>> >> duration = 90*60.0
>> >>
>> >> #Stop date
>> >> finalDate =  AbsoluteDate(initialDate, duration, utc)
>> >>
>> >> #Step duration in seconds
>> >> stepT = 30.0
>> >>
>> >> #Extrapolation loop
>> >> cpt = 1
>> >> extrapDate = initialDate
>> >> while extrapDate.compareTo(finalDate) <= 0:
>> >>     currentState = kepler.propagate(extrapDate)
>> >>     print  "step %d: time %s %s" % (cpt, currentState.getDate(),
>> >> currentState.getOrbit())
>> >>     extrapDate = AbsoluteDate(extrapDate, stepT, utc)
>> >>     cpt=cpt+1
>> >>
>> >>
>> >> ____________________________
>> >>
>> >> An interesting example of jython inheritance of java class:
>> >> _____________________________
>> >>
>> >>
>> >> # -*- coding: utf-8 -*-
>> >> '''
>> >> /* Copyright 2002-2010 CS Communication & Syst?mes
>> >>  * Licensed to CS Communication & Syst?mes (CS) under one or more
>> >>  * contributor license agreements.  See the NOTICE file distributed
>> >> with
>> >>  * this work for additional information regarding copyright ownership.
>> >>  * CS licenses this file to You under the Apache License, Version 2.0
>> >>  * (the "License"); you may not use this file except in compliance with
>> >>  * the License.  You may obtain a copy of the License at
>> >>  *
>> >>  *   http://www.apache.org/licenses/LICENSE-2.0
>> >>  *
>> >>  * Unless required by applicable law or agreed to in writing, software
>> >>  * distributed under the License is distributed on an "AS IS" BASIS,
>> >>  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
>> >> implied.
>> >>  * See the License for the specific language governing permissions and
>> >>  * limitations under the License.
>> >>  */
>> >>
>> >> Translated from SlaveMode.java to jython by Petrus Hyv?nen 2011-05-04
>> >> '''
>> >> # orekit and common maths in CLASSPATH through eclipse project
>> >> import java, os
>> >>
>> >> from org.orekit.data import DataProvidersManager
>> >> from org.orekit.data import ZipJarCrawler
>> >> from org.apache.commons.math.geometry import Vector3D
>> >> from org.orekit.bodies import BodyShape
>> >> from org.orekit.bodies import GeodeticPoint
>> >> from org.orekit.bodies import OneAxisEllipsoid
>> >> from org.orekit.errors import OrekitException;
>> >> from org.orekit.frames import Frame
>> >> from org.orekit.frames import FramesFactory
>> >> from org.orekit.frames import TopocentricFrame
>> >> from org.orekit.orbits import KeplerianOrbit
>> >> from org.orekit.orbits import Orbit
>> >> from org.orekit.propagation import Propagator
>> >> from org.orekit.propagation import SpacecraftState
>> >> from org.orekit.propagation.analytical import KeplerianPropagator
>> >> from org.orekit.propagation.events import ElevationDetector
>> >> from org.orekit.propagation.events import EventDetector
>> >> from org.orekit.time import AbsoluteDate
>> >> from org.orekit.time import TimeScalesFactory
>> >> from org.orekit.utils import PVCoordinates
>> >>
>> >> from math import degrees, radians, pi
>> >>
>> >> # Configure Orekit
>> >> DM = DataProvidersManager.getInstance()
>> >> crawler=ZipJarCrawler("orekit-data.zip")
>> >> DM.clearProviders()
>> >> DM.addProvider(crawler)
>> >>
>> >> # Initial state definition: date, orbit
>> >> initialDate = AbsoluteDate(2004, 01, 01, 23, 30, 00.000,
>> >> TimeScalesFactory.getUTC())
>> >> mu =  3.986004415e+14
>> >> inertialFrame = FramesFactory.getEME2000() # inertial frame for orbit
>> >> definition
>> >> position  = Vector3D(-6142438.668, 3492467.560, -25767.25680)
>> >> velocity  = Vector3D(505.8479685, 942.7809215, 7435.922231)
>> >> pvCoordinates = PVCoordinates(position, velocity)
>> >> initialOrbit = KeplerianOrbit(pvCoordinates, inertialFrame,
>> >> initialDate, mu)
>> >>
>> >> # Propagator : consider a simple keplerian motion (could be more
>> >> elaborate)
>> >> kepler = KeplerianPropagator(initialOrbit)
>> >>
>> >> #Earth and frame
>> >> ae =  6378137.0 # // equatorial radius in meter
>> >> f  =  1.0 / 298.257223563 #; // flattening
>> >> ITRF2005 = FramesFactory.getITRF2005() #; // terrestrial frame at an
>> >> arbitrary date
>> >> earth = OneAxisEllipsoid(ae, f, ITRF2005)
>> >>
>> >> # Station
>> >> longitude = radians(45.0)
>> >> latitude  = radians(25.0)
>> >> altitude  = 0.0
>> >> station1 = GeodeticPoint(latitude, longitude, altitude)
>> >> sta1Frame = TopocentricFrame(earth, station1, "station1")
>> >>
>> >> # Event definition
>> >> maxcheck  = 1.0
>> >> elevation = radians(5.0)
>> >>
>> >>
>> >> class VisibilityDetector(ElevationDetector):
>> >> # Class for handling the eventOccured java. Example of subclassing
>> >> # a java class in jython
>> >>     def __init__(self,  maxCheck,  elevation, topo):
>> >>         ElevationDetector.__init__(self,maxCheck, elevation, topo)
>> >>
>> >>     def eventOccurred(self, s, increasing):
>> >>         if (increasing):
>> >>             print "Visibility on",
>> >> self.topocentricFrame.getName(),"begins
>> >> at" , s.getDate()
>> >>         else:
>> >>             print "Visibility on",  self.topocentricFrame.getName(),
>> >> "ends
>> >> at" , s.getDate()
>> >>         return self.CONTINUE
>> >>
>> >> sta1Visi = VisibilityDetector(maxcheck, elevation, sta1Frame)
>> >>
>> >> #Add event to be detected
>> >> kepler.addEventDetector(sta1Visi)
>> >>
>> >> #Propagate from the initial date to the first raising or for the fixed
>> >> duration
>> >> finalState = kepler.propagate(initialDate.shiftedBy(1500.0))
>> >>
>> >> print "Final state : " , finalState.getDate().durationFrom(initialDate)
>> >>
>> >> _________________________________
>> >>
>> >>
>> >>
>> >
>> >
>>
>>
>>
>> ----------------------------------------------------------------
>> This message was sent using IMP, the Internet Messaging Program.
>>
>>
>

Follow-Ups:
- RE: [Orekit Users] orekit and Jython
  - From: Brian H <brianh4321@hotmail.com>
- RE: [Orekit Users] orekit and Jython
  - From: Brian H <brianh4321@hotmail.com>

References:
- [Orekit Users] orekit and Jython
  - From: "Petrus Hyvönen" <petrus.hyvonen@gmail.com>
- Re: [Orekit Users] orekit and Jython
  - From: beowulf zhang <beowulf.zhang@gmail.com>
- Re: [Orekit Users] orekit and Jython
  - From: MAISONOBE Luc <luc.maisonobe@c-s.fr>
- RE: [Orekit Users] orekit and Jython
  - From: Brian H <brianh4321@hotmail.com>

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