Purpose: A crib showing advanced usage of the 2D velocity slices code. Run "thm_ui_slice2d" on the IDL console to use for the GUI version. (Also part of the Analysis menu on the main THEMIS GUI) Methods: Geomtric: Each point on the plot is given the value of the bin it instersects. This allows bin boundaries to be drawn at high resolutions. 2D Interpolation: Datapoints within the specified theta or z-axis range are projected onto the slice plane and linearly interpolated onto a regular 2D grid. 3D Interpolation: The entire 3-dimensional distribution is linearly interpolated onto a regular 3D grid and a slice is extracted from the volume. Coordinates: The coordinate system in which the slice will be oriented. Options are 'DSL' (default), 'GSM', 'GSE' and the following magnetic field aligned coordinates (field parallel to z axis). 'xgse': The x axis is the projection of the GSE x-axis 'ygsm': The y axis is the projection of the GSM y-axis 'zdsl': The y axis is the projection of the DSL z-axis 'RGeo': The x is the projection of radial spacecraft position vector (GEI) 'mRGeo': The x axis is the projection of the negative radial spacecraft position vector (GEI) 'phiGeo': The y axis is the projection of the azimuthal spacecraft position vector (GEI), positive eastward 'mphiGeo': The y axis is the projection of the azimuthal spacecraft position vector (GEI), positive westward 'phiSM': The y axis is the projection of the azimuthal spacecraft position vector in Solar Magnetic coords 'mphiSM': The y axis is the projection of the negative azimuthal spacecraft position vector in Solar Magnetic coords Slice Orientation The slice plane is oriented by using the following options to specify its x and y axes with respect to the coordinate system. ("BV," "BE", and "perp" will be invariant between coordinate systems). 'BV': The x axis is parallel to B field; the bulk velocity defines the x-y plane 'BE': The x axis is parallel to B field; the B x V(bulk) vector defines the x-y plane 'xy': (default) The x axis is along the coordinate's x axis and y is along the coordinate's y axis 'xz': The x axis is along the coordinate's x axis and y is along the coordinate's z axis 'yz': The x axis is along the coordinate's y axis and y is along the coordinate's z axis 'xvel': The x axis is along the coordinate's x axis; the x-y plane is defined by the bulk velocity 'perp': The x axis is the bulk velocity projected onto the plane normal to the B field; y is B x V(bulk) 'perp_xy': The coordinate's x & y axes are projected onto the plane normal to the B field 'perp_xz': The coordinate's x & z axes are projected onto the plane normal to the B field 'perp_yz': The coordinate's y & z axes are projected onto the plane normal to the B field Contamination removal: TBD Other: Detailed information on keywords and usage can be found in the documentation for: thm_part_slice2d.pro (main slices routine) thm_part_slice2d_plot.pro (slices plotting routine) thm_part_dist_array.pro (particle data load routine) Notes: $LastChangedBy: aaflores $ $LastChangedDate: 2013-12-18 15:17:19 -0800 (Wed, 18 Dec 2013) $ $LastChangedRevision: 13704 $ $URL: svn+ssh://thmsvn@ambrosia.ssl.berkeley.edu/repos/spdsoft/trunk/projects/themis/examples/advanced/thm_crib_part_slice2d_adv.pro $;