Exemple #1
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  /**
   * Convert lat/lon coordinates to projection coordinates.
   *
   * @param from array of lat/lon coordinates: from[2][n], where from[0][i], from[1][i] is the
   *     (lat,lon) coordinate of the ith point
   * @param to resulting array of projection coordinates, where to[0][i], to[1][i] is the (x,y)
   *     coordinate of the ith point
   * @param latIndex index of latitude in "from"
   * @param lonIndex index of longitude in "from"
   * @return the "to" array.
   */
  public double[][] latLonToProj(double[][] from, double[][] to, int latIndex, int lonIndex) {
    int cnt = from[0].length;
    double[] fromLatA = from[latIndex];
    double[] fromLonA = from[lonIndex];
    double[] resultXA = to[INDEX_X];
    double[] 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 lonDiff = Math.toRadians(LatLonPointImpl.lonNormal(fromLon - lon0Degrees));
      double cosc = sinLat0 * Math.sin(fromLat) + cosLat0 * Math.cos(fromLat) * Math.cos(lonDiff);
      if (cosc >= 0) {
        toX = R * Math.cos(fromLat) * Math.sin(lonDiff);
        toY = R * (cosLat0 * Math.sin(fromLat) - sinLat0 * Math.cos(fromLat) * Math.cos(lonDiff));
      } else {
        toX = Double.POSITIVE_INFINITY;
        toY = Double.POSITIVE_INFINITY;
      }

      resultXA[i] = toX;
      resultYA[i] = toY;
    }
    return to;
  }
Exemple #2
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  /**
   * Construct a Orthographic Projection, specify earth radius
   *
   * @param lat0 lat origin of the coord. system on the projection plane
   * @param lon0 lon origin of the coord. system on the projection plane
   * @param earthRadius radius of the earth
   * @throws IllegalArgumentException if lat0, par1, par2 = +/-90 deg
   */
  public Orthographic(double lat0, double lon0, double earthRadius) {
    super("Orthographic", false);

    this.lat0 = Math.toRadians(lat0);
    this.lon0 = Math.toRadians(lon0);
    R = earthRadius;

    precalculate();

    addParameter(CF.GRID_MAPPING_NAME, CF.ORTHOGRAPHIC);
    addParameter(CF.LATITUDE_OF_PROJECTION_ORIGIN, lat0);
    addParameter(CF.LONGITUDE_OF_PROJECTION_ORIGIN, lon0);
    addParameter(CF.EARTH_RADIUS, earthRadius * 1000);
  }
Exemple #3
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  /**
   * Convert a LatLonPoint to projection coordinates
   *
   * @param latLon convert from these lat, lon coordinates
   * @param result the object to write to
   * @return the given result
   */
  public ProjectionPoint latLonToProj(LatLonPoint latLon, ProjectionPointImpl result) {
    double toX, toY;
    double fromLat = latLon.getLatitude();
    double fromLon = latLon.getLongitude();
    double fromLat_r = Math.toRadians(fromLat);

    // infinite projection
    if ((Math.abs(90.0 - Math.abs(fromLat))) < TOLERANCE) {
      toX = Double.POSITIVE_INFINITY;
      toY = Double.POSITIVE_INFINITY;
    } else {
      toX = A * Math.toRadians(LatLonPointImpl.range180(fromLon - this.lon0));
      toY = A * SpecialMathFunction.atanh(Math.sin(fromLat_r)); // p 41 Snyder
    }

    result.setLocation(toX + falseEasting, toY + falseNorthing);
    return result;
  }
Exemple #4
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  /**
   * Convert a LatLonPoint to projection coordinates
   *
   * @param latLon convert from these lat, lon coordinates
   * @param result the object to write to
   * @return the given result
   */
  public ProjectionPoint latLonToProj(LatLonPoint latLon, ProjectionPointImpl result) {
    double toX, toY;
    double fromLat = latLon.getLatitude();
    double fromLon = latLon.getLongitude();

    fromLat = Math.toRadians(fromLat);
    double lonDiff = Math.toRadians(LatLonPointImpl.lonNormal(fromLon - lon0Degrees));
    double cosc = sinLat0 * Math.sin(fromLat) + cosLat0 * Math.cos(fromLat) * Math.cos(lonDiff);
    if (cosc >= 0) {
      toX = R * Math.cos(fromLat) * Math.sin(lonDiff);
      toY = R * (cosLat0 * Math.sin(fromLat) - sinLat0 * Math.cos(fromLat) * Math.cos(lonDiff));
    } else {
      toX = Double.POSITIVE_INFINITY;
      toY = Double.POSITIVE_INFINITY;
    }

    result.setLocation(toX, toY);
    return result;
  }
Exemple #5
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  /**
   * Construct a Mercator Projection.
   *
   * @param lon0 longitude of origin (degrees)
   * @param par standard parallel (degrees). cylinder cuts earth at this latitude.
   * @param false_easting false_easting in km
   * @param false_northing false_northing in km
   * @param radius earth radius in km
   */
  public Mercator(
      double lon0, double par, double false_easting, double false_northing, double radius) {
    super("Mercator", false);

    this.lon0 = lon0;
    this.par = par;
    this.falseEasting = false_easting;
    this.falseNorthing = false_northing;
    this.earthRadius = radius;

    this.par_r = Math.toRadians(par);

    precalculate();

    addParameter(CF.GRID_MAPPING_NAME, CF.MERCATOR);
    addParameter(CF.LONGITUDE_OF_PROJECTION_ORIGIN, lon0);
    addParameter(CF.STANDARD_PARALLEL, par);
    addParameter(CF.EARTH_RADIUS, earthRadius * 1000);
    if ((false_easting != 0.0) || (false_northing != 0.0)) {
      addParameter(CF.FALSE_EASTING, false_easting);
      addParameter(CF.FALSE_NORTHING, false_northing);
      addParameter(CDM.UNITS, "km");
    }
  }
Exemple #6
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 /**
  * Set the origin latitude.
  *
  * @param lat the origin latitude.
  */
 public void setOriginLat(double lat) {
   lat0 = Math.toRadians(lat);
   precalculate();
 }
Exemple #7
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 /**
  * Set the origin longitude.
  *
  * @param lon the origin longitude.
  */
 public void setOriginLon(double lon) {
   lon0 = Math.toRadians(lon);
   precalculate();
 }