Returns agridded, 2D array containing radii, given random longitude, latitude, and radius values.
A (3, n) array containing the random longitude, latitude, and radius coordinates to be gridded.grid_x
The x dimension of the grid. The longitude values are scaled to fit this dimension (unless the XMin or XMax keywords are set).grid_y
The y dimension of the grid. The latitude values are scaled to fit this dimension (unless the YMin or YMax keywords are set).
A gridded, 2D array containing radius values.
If present and nonzero, reads the input coordinates in degrees instead of in radians.Order
The order of the weighting function to use for neighborhood averaging. Points are weighted by the function:
w = 1.0 / (dist ^ Order)
dist is the distance to the point. (Default: 2)Radius
The radius of the sphere to grid on. The minimum allowable radius is 0.5. (Default: 1.0)With a smaller radius, the data points are closer together and more smoothing occurs. A larger radius causes less smoothing.
XMax
The longitude of the right edge of the grid. Should be in the range -
to + radians (-180 to +180 degrees). The XMax value is assumed to be in radians unless the Degrees keyword is set. If XMax is omitted, then a longitude of
is mapped to the right edge of the grid.XMin
The longitude of the left edge of the grid. Should be in the range - to + radians (-180 to +180 degrees). The value is assumed to be in radians unless the Degrees keyword is set. If XMin is omitted, then a longitude of -
is mapped to the left edge of the grid. YMax
The latitude of the top edge of the grid. Should be in the range -/2 to +/2 radians (-90 to +90 degrees). The YMax value is assumed to be in radians unless the Degrees keyword is set. If YMax is omitted, then a latitude of
/ 2 is mapped to the top edge of the grid. YMin
The latitude of the bottom edge of the grid. Should be in the range -/2 to +/2 radians (-90 to +90 degrees). The YMin value is assumed to be in radians unless the Degrees keyword is set.If YMin is omitted, then a latitude of -
/2 is mapped to the bottom edge of the grid.
The longitude values are assumed to be in the range -
to + /2 to +/2 (-90 to +90 if the Degrees keyword is set).To grid on a portion of a sphere rather than on an entire sphere, use the XMin, XMax, YMin, and YMax keywords.
PRO grid_demo5
sphere = FLTARR(3, 6) sphere(*, 0) = [ 33.0, -64.0, 0.2] sphere(*, 1) = [280.0, 5.0, 1.8] sphere(*, 2) = [350.0, 41.0, 1.9] sphere(*, 3) = [310.0, 83.0, 0.3] sphere(*, 4) = [ 67.0, -16.0, 1.6] sphere(*, 5) = [133.0, -75.0, 0.2] sphere(0, *) = sphere(0, *) - 180.0
random longitude, latitude, and radius points.
sphere = GRID_SPHERE(sphere, 32, 32, $
/Degrees, Order=4.0, Radius=20.0)
POLY_SPHERE, sphere, 32, 32, vertex_list, polygon_list
WINDOW, 0, Colors=128, XSize=800, YSize=600
LOADCT, 3
CENTER_VIEW, Xr=[-2.0, 2.0], Yr=[-2.0, 2.0], $
Zr=[-2.0, 2.0], Ax=(-40.0), Az=0.0, $
Zoom=1.0, Winx=800, Winy=600
SET_SHADING, Light=[-0.5, 0.5, 1.0] TVSCL, POLYSHADE(vertex_list, polygon_list, /T3d)
END
sphere_demo3 demonstration program in:
wavedir
/demo/arlwavedir:[DEMO.ARL]
wavedir\demo\arl
wavedir is the main PV-WAVE directory.
UNIX and OpenVMS Users: For information on the optional software package for advanced gridding, PV-WAVE:GTGRID, contact your Visual Numerics account representative.
