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polar stereographic coordinate transformation (lat/lon to map)

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Transforms lat/lon data into map coordinates for a polar stereographic map projection. NSIDC/SCAR

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Description

POLARSTEREO_FWD transforms lat/lon data to map coordinates for a polar stereographic system
  [X,Y]=POLARSTEREO_FWD(LAT,LONG,EARTHRADIUS,ECCENTRICITY,LAT_TRUE,LON_POSY)
  X and Y are the map coordinates (scalars, vectors, or matrices of equal size).
  LAT and LON are in decimal degrees with negative numbers (-) for S and W.
  EARTHRADIUS is the radius of the earth defined in the projection
      (default is 6378137.0 m, WGS84)
  ECCENTRICITY is the earth's misshapenness
      (default is 0.08181919)
  LAT_TRUE is the latitude of true scale in degrees, aka standard parallel
      (default is -70). Note that some NSIDC data use 70 and some use 71.
  LON_POSY is the meridian in degrees along the positive Y axis of the map
      (default is 0)
  
  The National Snow and Ice Data Center (NSIDC) and Scientific Committee
  on Antarctic Research (SCAR) use a version of the polar stereographic
  projection that Matlab does not have. This file does transformations to
  map coordinates from geographic coordinates to facilitate
  comparisons with other datasets.

  Equations from: Map Projections - A Working manual - by J.P. Snyder. 1987
    See the section on Polar Stereographic, with a south polar aspect and
  known phi_c not at the pole.

  See also: POLARSTEREO_INV

Acknowledgements

This file inspired Antarctic Mapping Tools.

MATLAB release MATLAB 7.4 (R2007a)
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Comments and Ratings (2)
09 Jul 2013 Chad Greene  
15 Mar 2013 tarun

how should lat_true and lat_posy be defined in this function. I got my lat -84 and long as -157

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