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<?php
/**
* Geographic Position Property
* @package qCal
* @copyright Luke Visinoni (luke.visinoni@gmail.com)
* @author Luke Visinoni (luke.visinoni@gmail.com)
* @license GNU Lesser General Public License
*
* RFC 2445 Definition
*
* Property Name: GEO
*
* Purpose: This property specifies information related to the global
* position for the activity specified by a calendar component.
*
* Value Type: FLOAT. The value MUST be two SEMICOLON separated FLOAT
* values.
*
* Property Parameters: Non-standard property parameters can be
* specified on this property.
*
* Conformance: This property can be specified in "VEVENT" or "VTODO"
* calendar components.
*
* Description: The property value specifies latitude and longitude, in
* that order (i.e., "LAT LON" ordering). The longitude represents the
* location east or west of the prime meridian as a positive or negative
* real number, respectively. The longitude and latitude values MAY be
* specified up to six decimal places, which will allow for accuracy to
* within one meter of geographical position. Receiving applications
* MUST accept values of this precision and MAY truncate values of
* greater precision.
*
* Values for latitude and longitude shall be expressed as decimal
* fractions of degrees. Whole degrees of latitude shall be represented
* by a two-digit decimal number ranging from 0 through 90. Whole
* degrees of longitude shall be represented by a decimal number ranging
* from 0 through 180. When a decimal fraction of a degree is specified,
* it shall be separated from the whole number of degrees by a decimal
* point.
*
* Latitudes north of the equator shall be specified by a plus sign (+),
* or by the absence of a minus sign (-), preceding the digits
* designating degrees. Latitudes south of the Equator shall be
* designated by a minus sign (-) preceding the digits designating
* degrees. A point on the Equator shall be assigned to the Northern
* Hemisphere.
*
* Longitudes east of the prime meridian shall be specified by a plus
* sign (+), or by the absence of a minus sign (-), preceding the digits
* designating degrees. Longitudes west of the meridian shall be
* designated by minus sign (-) preceding the digits designating
* degrees. A point on the prime meridian shall be assigned to the
* Eastern Hemisphere. A point on the 180th meridian shall be assigned
* to the Western Hemisphere. One exception to this last convention is
* permitted. For the special condition of describing a band of latitude
* around the earth, the East Bounding Coordinate data element shall be
* assigned the value +180 (180) degrees.
*
* Any spatial address with a latitude of +90 (90) or -90 degrees will
* specify the position at the North or South Pole, respectively. The
* component for longitude may have any legal value.
*
* With the exception of the special condition described above, this
* form is specified in Department of Commerce, 1986, Representation of
* geographic point locations for information interchange (Federal
* Information Processing Standard 70-1): Washington, Department of
* Commerce, National Institute of Standards and Technology.
*
* The simple formula for converting degrees-minutes-seconds into
* decimal degrees is:
*
* decimal = degrees + minutes/60 + seconds/3600.
*
* Format Definition: The property is defined by the following notation:
*
* geo = "GEO" geoparam ":" geovalue CRLF
*
* geoparam = *(";" xparam)
*
* geovalue = float ";" float
* ;Latitude and Longitude components
*
* Example: The following is an example of this property:
*
* GEO:37.386013;-122.082932
*/
class qCal_Property_Geo extends qCal_Property {
protected $type = 'FLOAT';
protected $allowedComponents = array('VEVENT', 'VTODO');
}