NewGamePhysics.Physics.GravityCalculator Class Reference

Class to represent gravity. More...

List of all members.

Public Member Functions

 GravityCalculator ()
 Constructs the gravity object for earth.
 GravityCalculator (CelestialObject body)
 Constructs the gravity object for a celestial object.
string GetModelInfo ()
 Returns information on the current gravity model for the selected celestial object.

Public Attributes

const double G = 6.67428e-11
 The gravitational constant in units of m^3 kg^-1 s^-2.
const double StandardBouguerDensity = 2670.0
 Nominally averaged crustal density of the earth in kg m^-3 used in Bouguer correction.

Properties

EarthGravityModel EarthGravityModel [get, set]
 Gets or sets the mathematical model used when correcting for location when the simulated body is earth. Sets the simulated body to be earth and updates g value.
MarsGravityModel MarsGravityModel [get, set]
 Gets or sets the mathematical model used when correcting for location when the simulated body is mars. Sets the simulated body to be mars and updates g value.
EarthGravityAnomaly EarthGravityAnomaly [get, set]
 Gets or sets the anomaly calculation to use when correcting for height and/or elevation when the simulated body is earth. Some models ('Hd') already incorporate the 'fac' anomaly.
double Value [get]
 Gets or sets the gravitational field value in units of m/sec^2.
double Latitude [get, set]
 Gets or sets the latitude of the observer in degrees. Value range -90.0 to 90.0 degrees.
double Longitude [get, set]
 Gets or sets the longitude of the observer in degrees. Value range 0.0 to 360.0 degrees.
double Elevation [get, set]
 Gets or sets the elevation of the observer in meters above sea level. Maybe adjusts ground elevation for consistency. Value range 0 to 1000000 meters.
double GroundElevation [get, set]
 Gets or sets the height of the ground in meters above sea level. Maybe adjusts elevation for consistency. Value range 0 to 10000 meters.

Detailed Description

Class to represent gravity.

Definition at line 182 of file GravityCalculator.cs.

Constructor & Destructor Documentation

NewGamePhysics.Physics.GravityCalculator.GravityCalculator (  ) 

Constructs the gravity object for earth.

Definition at line 488 of file GravityCalculator.cs.

00489             : this(CelestialObject.Earth)
00490         {
00491         }

NewGamePhysics.Physics.GravityCalculator.GravityCalculator ( CelestialObject  body  ) 

Constructs the gravity object for a celestial object.

Parameters:
body The celestial object to represent.

Definition at line 497 of file GravityCalculator.cs.

00498         {
00499             // Initialize earth models
00500             this.wgsModel = new GravityEarthWgsModel();
00501             this.grsModel = new GravityEarthGrsModel();
00502             this.gfcGrid = new GravityEarthGfcGrid();
00503             this.gfcModel = new GravityEarthGfcModel();
00504 
00505             // Initialize mars models
00506             this.mroModel = new GravityMarsMroModel();
00507 
00508             // Initialize instance state
00509             this.simulatedBody = body;
00510             this.earthGravityModel = EarthGravityModel.None;
00511             this.earthGravityAnomaly = EarthGravityAnomaly.None;
00512             this.marsGravityModel = MarsGravityModel.None;
00513             this.latitude = 0.0;
00514             this.elevation = 0.0;
00515             this.groundElevation = 0.0;
00516 
00517             // Initialize current value 
00518             this.UpdateValue();
00519         }

Member Function Documentation

string NewGamePhysics.Physics.GravityCalculator.GetModelInfo (  ) 

Returns information on the current gravity model for the selected celestial object.

Returns:
Informational text.

Definition at line 526 of file GravityCalculator.cs.

00527         {
00528             StringBuilder sb = new StringBuilder();
00529 
00530             switch (this.simulatedBody)
00531             {
00532                 case CelestialObject.Sun:
00533                     sb.AppendLine("Model: Fixed value.");
00534                     sb.AppendLine("Source: http://www.wikipedia.org [Earth's Gravity]");
00535                     break;
00536                 case CelestialObject.Mercury:
00537                     sb.AppendLine("Model: Fixed value.");
00538                     sb.AppendLine("Source: http://www.wikipedia.org [Earth's Gravity]");
00539                     break;
00540                 case CelestialObject.Venus:
00541                     sb.AppendLine("Model: Fixed value.");
00542                     sb.AppendLine("Source: http://www.wikipedia.org [Earth's Gravity]");
00543                     break;
00544                 case CelestialObject.Earth:
00545                     switch (this.earthGravityModel)
00546                     {
00547                         case EarthGravityModel.None:
00548                             sb.AppendLine("Model: Fixed value.");
00549                             sb.AppendLine("Source: http://www.wikipedia.org [Earth's Gravity]");
00550                             break;
00551                         case EarthGravityModel.FolkPhysics:
00552                             sb.AppendLine("Model: Commonly used fixed value.");
00553                             break;
00554                         case EarthGravityModel.Igf67:
00555                             sb.AppendLine("Model: Geodetic Reference System from 1967 (Version provided by IGF).");
00556                             sb.AppendLine("Source: http://geophysics.ou.edu/solid_earth/notes/potential/igf.htm");
00557                             break;
00558                         case EarthGravityModel.Grs80:
00559                             sb.AppendLine("Model: The GRS 80 geodetic system.");
00560                             sb.AppendLine("Source: http://bgi.cnes.fr:8110");
00561                             break;
00562                         case EarthGravityModel.Grs80Hd:
00563                             sb.AppendLine("Model: High-res calculation of the geodetic reference system (GRS 80)");
00564                             sb.AppendLine("Applies height correction.");
00565                             sb.AppendLine("Source: Hofmann-Wellenhof/Moritz, Physical Godesy, 2006.");
00566                             break;
00567                         case EarthGravityModel.Wgs84:
00568                             sb.AppendLine("Model: World Geodetic System 84 Ellipsoidal Gravity Formula");
00569                             sb.AppendLine("Source: http://www.wikipedia.org [Earth's Gravity]");
00570                             break;
00571                         case EarthGravityModel.Wgs84Hd:
00572                             sb.AppendLine("Model: High-res calculation of the World Geodetic System (WGS 84)");
00573                             sb.AppendLine("Applies height correction.");
00574                             sb.AppendLine("Source: Hofmann-Wellenhof/Moritz, Physical Godesy, 2006.");
00575                             break;
00576                         case EarthGravityModel.GfcGrid:
00577                             sb.AppendLine("Model: Grid interpolator of earths gravity based on data from");
00578                             sb.AppendLine("the International Center for Global Earth Models (ICGEM).");
00579                             sb.AppendLine("Grid based on eigen5c model with a 1 degree resolution.");
00580                             sb.AppendLine("Source: http://icgem.gfz-potsdam.de/ICGEM/ICGEM.html");
00581                             break;
00582                         case EarthGravityModel.Ggm03sModel:
00583                             sb.AppendLine("Model: Satellite only mean Earth Gravity Model from GRACE satellite");
00584                             sb.AppendLine("GGM03S is an unconstrained global gravity model complete to degree and order 180");
00585                             sb.AppendLine("accelerometer data. 47 months of GRACE data for the period from January 2003");
00586                             sb.AppendLine("through December 2006 were used (January 2004 excluded). The GRACE atmosphere-ocean");
00587                             sb.AppendLine("de-aliasing product (AOD1B) was used, but the mean of the AOD1B for the 47 months");
00588                             sb.AppendLine("has been restored so that GGM03S represents the true mean field.");
00589                             sb.AppendLine("Source: http://icgem.gfz-potsdam.de/ICGEM/ICGEM.html");
00590                             break;
00591                         case EarthGravityModel.Eigen5cModel:
00592                             sb.AppendLine("Model: A new global combined high-resolution GRACE-based gravity");
00593                             sb.AppendLine("field model of the GFZ-GRGS cooperation.");
00594                             sb.AppendLine("The reference epoch of this gravity field model is 01 Oct 2004");
00595                             sb.AppendLine("Source: http://icgem.gfz-potsdam.de/ICGEM/ICGEM.html");
00596                             break;
00597                     }
00598                     break;
00599                 case CelestialObject.Moon:
00600                     sb.AppendLine("Model: Fixed value.");
00601                     sb.AppendLine("Source: http://www.wikipedia.org [Earth's Gravity]");
00602                     break;
00603                 case CelestialObject.Mars:
00604                     switch (this.marsGravityModel)
00605                     {
00606                         case MarsGravityModel.None:
00607                             sb.AppendLine("Model: Fixed value.");
00608                             sb.AppendLine("Source: http://www.wikipedia.org [Earth's Gravity]");
00609                             break;
00610                         case MarsGravityModel.Normal:
00611                             sb.AppendLine("Model: Ellipsoid.");
00612                             sb.AppendLine("Algorithm: Hofmann-Wellenhof/Moritz, Physical Godesy, 2006");
00613                             sb.AppendLine("Source: http://pds-geosciences.wustl.edu/mro/mro-m-rss-5-sdp-v1/mrors_1xxx/data/rsdmap/");
00614                             break;
00615                         case MarsGravityModel.GgMro:
00616                             sb.AppendLine("Model: GgMro 095A NASA GSFC Mars Reconnaissance Orbiter.");
00617                             sb.AppendLine("A digital map of the Mars gravity anomalies derived from");
00618                             sb.AppendLine("spherical harmonic coefficients of the NASA GSFC MROMGM0032 Mars gravity field");
00619                             sb.AppendLine("Source: http://pds-geosciences.wustl.edu/mro/mro-m-rss-5-sdp-v1/mrors_1xxx/data/rsdmap/");
00620                             break;
00621                     }
00622                     break;
00623                 case CelestialObject.Jupiter:
00624                     sb.AppendLine("Model: Fixed value.");
00625                     sb.AppendLine("Source: http://www.wikipedia.org [Earth's Gravity]");
00626                     break;
00627                 case CelestialObject.Io:
00628                     sb.AppendLine("Model: Fixed value.");
00629                     sb.AppendLine("Source: http://www.wikipedia.org [Io_(moon)]");
00630                     break;
00631                 case CelestialObject.Europa:
00632                     sb.AppendLine("Model: Fixed value.");
00633                     sb.AppendLine("Source: http://www.wikipedia.org [Europa_(moon)]");
00634                     break;
00635                 case CelestialObject.Ganymede:
00636                     sb.AppendLine("Model: Fixed value.");
00637                     sb.AppendLine("Source: http://www.wikipedia.org [Ganymede_(moon)]");
00638                     break;
00639                 case CelestialObject.Callisto:
00640                     sb.AppendLine("Model: Fixed value.");
00641                     sb.AppendLine("Source: http://www.wikipedia.org [Callisto_(moon)]");
00642                     break;
00643                 case CelestialObject.Saturn:
00644                     sb.AppendLine("Model: Fixed value.");
00645                     sb.AppendLine("Source: http://www.wikipedia.org [Earth's Gravity]");
00646                     break;
00647                 case CelestialObject.Uranus:
00648                     sb.AppendLine("Model: Fixed value.");
00649                     sb.AppendLine("Source: http://www.wikipedia.org [Earth's Gravity]");
00650                     break;
00651                 case CelestialObject.Neptune:
00652                     sb.AppendLine("Model: Fixed value.");
00653                     sb.AppendLine("Source: http://www.wikipedia.org [Earth's Gravity]");
00654                     break;
00655             }
00656 
00657             return sb.ToString();
00658         }

Member Data Documentation

const double NewGamePhysics.Physics.GravityCalculator.G = 6.67428e-11

The gravitational constant in units of m^3 kg^-1 s^-2.

Definition at line 187 of file GravityCalculator.cs.

const double NewGamePhysics.Physics.GravityCalculator.StandardBouguerDensity = 2670.0

Nominally averaged crustal density of the earth in kg m^-3 used in Bouguer correction.

Source: http://gravmag.ou.edu/reduct/reduce.html

Definition at line 201 of file GravityCalculator.cs.

Property Documentation

EarthGravityAnomaly NewGamePhysics.Physics.GravityCalculator.EarthGravityAnomaly [get, set]

Gets or sets the anomaly calculation to use when correcting for height and/or elevation when the simulated body is earth. Some models ('Hd') already incorporate the 'fac' anomaly.

Definition at line 360 of file GravityCalculator.cs.

EarthGravityModel NewGamePhysics.Physics.GravityCalculator.EarthGravityModel [get, set]

Gets or sets the mathematical model used when correcting for location when the simulated body is earth. Sets the simulated body to be earth and updates g value.

Definition at line 289 of file GravityCalculator.cs.

double NewGamePhysics.Physics.GravityCalculator.Elevation [get, set]

Gets or sets the elevation of the observer in meters above sea level. Maybe adjusts ground elevation for consistency. Value range 0 to 1000000 meters.

Definition at line 431 of file GravityCalculator.cs.

double NewGamePhysics.Physics.GravityCalculator.GroundElevation [get, set]

Gets or sets the height of the ground in meters above sea level. Maybe adjusts elevation for consistency. Value range 0 to 10000 meters.

Definition at line 461 of file GravityCalculator.cs.

double NewGamePhysics.Physics.GravityCalculator.Latitude [get, set]

Gets or sets the latitude of the observer in degrees. Value range -90.0 to 90.0 degrees.

Definition at line 392 of file GravityCalculator.cs.

double NewGamePhysics.Physics.GravityCalculator.Longitude [get, set]

Gets or sets the longitude of the observer in degrees. Value range 0.0 to 360.0 degrees.

Definition at line 411 of file GravityCalculator.cs.

MarsGravityModel NewGamePhysics.Physics.GravityCalculator.MarsGravityModel [get, set]

Gets or sets the mathematical model used when correcting for location when the simulated body is mars. Sets the simulated body to be mars and updates g value.

Definition at line 327 of file GravityCalculator.cs.

double NewGamePhysics.Physics.GravityCalculator.Value [get]

Gets or sets the gravitational field value in units of m/sec^2.

Definition at line 380 of file GravityCalculator.cs.

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