cdm/src/main/java/ucar/unidata/geoloc/projection/LambertConformal.java
public float[][] latLonToProj(float[][] from, float[][] to, int latIndex,
                                int lonIndex) {
    int cnt = from[0].length;
    float[] fromLatA = from[latIndex];
    float[] fromLonA = from[lonIndex];
    float[] resultXA = to[INDEX_X];
    float[] resultYA = to[INDEX_Y];
    double toX, toY;

    for (int i = 0; i < cnt; i++) {
      double fromLat = fromLatA[i];
      double fromLon = fromLonA[i];

      fromLat = Math.toRadians(fromLat);
      double dlon = LatLonPointImpl.lonNormal(fromLon - lon0Degrees);
      double theta = n * Math.toRadians(dlon);
      double tn = Math.pow(Math.tan(PI_OVER_4 + fromLat / 2), n);
      double r = earthRadiusTimesF / tn;
      toX = r * Math.sin(theta);
      toY = rho - r * Math.cos(theta);

      resultXA[i] = (float) (toX + falseEasting);
      resultYA[i] = (float) (toY + falseNorthing);
    }
    return to;
  }
public float[][] latLonToProj(float[][] from, float[][] to, int latIndex,
                                int lonIndex) {
    int cnt = from[0].length;
    float[] fromLatA = from[latIndex];
    float[] fromLonA = from[lonIndex];
    float[] resultXA = to[INDEX_X];
    float[] resultYA = to[INDEX_Y];
    double toX, toY;

    for (int i = 0; i < cnt; i++) {
      double fromLat = fromLatA[i];
      double fromLon = fromLonA[i];

      fromLat = Math.toRadians(fromLat);
      double dlon = LatLonPointImpl.lonNormal(fromLon - lon0Degrees);
      double theta = n * Math.toRadians(dlon);
      double tn = Math.pow(Math.tan(PI_OVER_4 + fromLat / 2), n);
      double r = earthRadiusTimesF / tn;
      toX = r * Math.sin(theta);
      toY = rho - r * Math.cos(theta);

      resultXA[i] = (float) (toX + falseEasting);
      resultYA[i] = (float) (toY + falseNorthing);
    }
    return to;
  }
public float [ ] [ ] latLonToProj ( float [ ] [ ] from , float [ ] [ ] to , int latIndex , int lonIndex ) { int cnt = from [ 0 ] . length ; float [ ] fromLatA = from [ latIndex ] ; float [ ] fromLonA = from [ lonIndex ] ; float [ ] resultXA = to [ INDEX_X ] ; float [ ] resultYA = to [ INDEX_Y ] ; double toX , toY ; for ( int i = 0 ; i < cnt ; i ++ ) { double fromLat = fromLatA [ i ] ; double fromLon = fromLonA [ i ] ; fromLat = Math . toRadians ( fromLat ) ; double dlon = LatLonPointImpl . lonNormal ( fromLon - lon0Degrees ) ; double theta = n * Math . toRadians ( dlon ) ; double tn = Math . pow ( Math . tan ( PI_OVER_4 + fromLat / 2 ) , n ) ; double r = earthRadiusTimesF / tn ; toX = r * Math . sin ( theta ) ; toY = rho - r * Math . cos ( theta ) ; resultXA [ i ] = ( float ) ( toX + falseEasting ) ; resultYA [ i ] = ( float ) ( toY + falseNorthing ) ; } return to ; }
Convert lat/lon coordinates to projection coordinates.

@param from     array of lat/lon coordinates: from[2][n], where
(from[latIndex][i], from[lonIndex][i]) is the (lat,lon)
coordinate of the ith point
@param to       resulting array of projection coordinates: to[2][n]
where (to[0][i], to[1][i]) is the (x,y) coordinate of
the ith point
@param latIndex index of lat coordinate; must be 0 or 1
@param lonIndex index of lon coordinate; must be 0 or 1
@return the "to" array
Convert lat / lon coordinates to projection coordinates .