<?php
/**
 * Zend Framework
 *
 * LICENSE
 *
 * This source file is subject to the new BSD license that is bundled
 * with this package in the file LICENSE.txt.
 * It is also available through the world-wide-web at this URL:
 * http://framework.zend.com/license/new-bsd
 * If you did not receive a copy of the license and are unable to
 * obtain it through the world-wide-web, please send an email
 * to license@zend.com so we can send you a copy immediately.
 *
 * @category   Zend
 * @package    Zend_Measure
 * @copyright  Copyright (c) 2005-2007 Zend Technologies USA Inc. (http://www.zend.com)
 * @version    $Id: Length.php 3224 2007-02-05 22:08:48Z gavin $
 * @license    http://framework.zend.com/license/new-bsd     New BSD License
 */


/**
 * Implement needed classes
 */
require_once 'Zend/Measure/Exception.php';
require_once 'Zend/Measure/Abstract.php';
require_once 'Zend/Locale.php';


/**
 * @category   Zend
 * @package    Zend_Measure
 * @subpackage Zend_Measure_Length
 * @copyright  Copyright (c) 2005-2007 Zend Technologies USA Inc. (http://www.zend.com)
 * @license    http://framework.zend.com/license/new-bsd     New BSD License
 */
class Zend_Measure_Length extends Zend_Measure_Abstract
{
    // Length definitions
    const STANDARD = 'METER';

    const AGATE           = 'AGATE';
    const ALEN_DANISH     = 'ALEN_DANISH';
    const ALEN            = 'ALEN';
    const ALEN_SWEDISH    = 'ALEN_SWEDISH';
    const ANGSTROM        = 'ANGSTROM';
    const ARMS            = 'ARMS';
    const ARPENT_CANADIAN = 'ARPENT_CANADIAN';
    const ARPENT          = 'ARPENT';
    const ARSHEEN         = 'ARSHEEN';
    const ARSHIN          = 'ARSHIN';
    const ARSHIN_IRAQ     = 'ARSHIN_IRAQ';
    const ASTRONOMICAL_UNIT = 'ASTRONOMICAL_UNIT';
    const ATTOMETER       = 'ATTOMETER';
    const BAMBOO          = 'BAMBOO';
    const BARLEYCORN      = 'BARLEYCORN';
    const BEE_SPACE       = 'BEE_SPACE';
    const BICRON          = 'BICRON';
    const BLOCK_US_EAST   = 'BLOCK_US_EAST';
    const BLOCK_US_WEST   = 'BLOCK_US_WEST';
    const BLOCK_US_SOUTH  = 'BLOCK_US_SOUTH';
    const BOHR            = 'BOHR';
    const BRACCIO         = 'BRACCIO';
    const BRAZA_ARGENTINA = 'BRAZA_ARGENTINA';
    const BRAZA           = 'BRAZA';
    const BRAZA_US        = 'BRAZA_US';
    const BUTTON          = 'BUTTON';
    const CABLE_US        = 'CABLE_US';
    const CABLE_UK        = 'CABLE_UK';
    const CALIBER         = 'CALIBER';
    const CANA            = 'CANA';
    const CAPE_FOOT       = 'CAPE_FOOT';
    const CAPE_INCH       = 'CAPE_INCH';
    const CAPE_ROOD       = 'CAPE_ROOD';
    const CENTIMETER      = 'CENTIMETER';
    const CHAIN           = 'CHAIN';
    const CHAIN_ENGINEER  = 'CHAIN_ENGINEER';
    const CHIH            = 'CHIH';
    const CHINESE_FOOT    = 'CHINESE_FOOT';
    const CHINESE_INCH    = 'CHINESE_INCH';
    const CHINESE_MILE    = 'CHINESE_MILE';
    const CHINESE_YARD    = 'CHINESE_YARD';
    const CITY_BLOCK_US_EAST  = 'CITY_BLOCK_US_EAST';
    const CITY_BLOCK_US_WEST  = 'CITY_BLOCK_US_WEST';
    const CITY_BLOCK_US_SOUTH = 'CITY_BLOCK_US_SOUTH';
    const CLICK           = 'CLICK';
    const CUADRA          = 'CUADRA';
    const CUADRA_ARGENTINA= 'CUADRA_ARGENTINA';
    const CUBIT_EGYPT     = 'Length:CUBIT_EGYPT';
    const CUBIT_ROYAL     = 'CUBIT_ROYAL';
    const CUBIT_UK        = 'CUBIT_UK';
    const CUBIT           = 'CUBIT';
    const CUERDA          = 'CUERDA';
    const DECIMETER       = 'DECIMETER';
    const DEKAMETER       = 'DEKAMETER';
    const DIDOT_POINT     = 'DIDOT_POINT';
    const DIGIT           = 'DIGIT';
    const DIRAA           = 'DIRAA';
    const DONG            = 'DONG';
    const DOUZIEME_WATCH  = 'DOUZIEME_WATCH';
    const DOUZIEME        = 'DOUZIEME';
    const DRA_IRAQ        = 'DRA_IRAQ';
    const DRA             = 'DRA';
    const EL              = 'EL';
    const ELL             = 'ELL';
    const ELL_SCOTTISH    = 'ELL_SCOTTISH';
    const ELLE            = 'ELLE';
    const ELLE_VIENNA     = 'ELLE_VIENNA';
    const EM              = 'EM';
    const ESTADIO_PORTUGAL= 'ESTADIO_PORTUGAL';
    const ESTADIO         = 'ESTADIO';
    const EXAMETER        = 'EXAMETER';
    const FADEN_AUSTRIA   = 'FADEN_AUSTRIA';
    const FADEN           = 'FADEN';
    const FALL            = 'FALL';
    const FALL_SCOTTISH   = 'FALL_SCOTTISH';
    const FATHOM          = 'FATHOM';
    const FATHOM_ANCIENT  = 'FATHOM_ANCIENT';
    const FAUST           = 'FAUST';
    const FEET_OLD_CANADIAN = 'FEET_OLD_CANADIAN';
    const FEET_EGYPT      = 'FEET_EGYPT';
    const FEET_FRANCE     = 'FEET_FRANCE';
    const FEET            = 'FEET';
    const FEET_IRAQ       = 'FEET_IRAQ';
    const FEET_NETHERLAND = 'FEET_NETHERLAND';
    const FEET_ITALIC     = 'FEET_ITALIC';
    const FEET_SURVEY     = 'FEET_SURVEY';
    const FEMTOMETER      = 'FEMTOMETER';
    const FERMI           = 'FERMI';
    const FINGER          = 'FINGER';
    const FINGERBREADTH   = 'FINGERBREADTH';
    const FIST            = 'FIST';
    const FOD             = 'FOD';
    const FOOT_EGYPT      = 'FOOT_EGYPT';
    const FOOT_FRANCE     = 'FOOT_FRANCE';
    const FOOT            = 'FOOT';
    const FOOT_IRAQ       = 'FOOT_IRAQ';
    const FOOT_NETHERLAND = 'FOOT_NETHERLAND';
    const FOOT_ITALIC     = 'FOOT_ITALIC';
    const FOOT_SURVEY     = 'FOOT_SURVEY';
    const FOOTBALL_FIELD_CANADA = 'FOOTBALL_FIELD_CANADA';
    const FOOTBALL_FIELD_US     = 'FOOTBALL_FIELD_US';
    const FOOTBALL_FIELD  = 'FOOTBALL_FIELD';
    const FURLONG         = 'FURLONG';
    const FURLONG_SURVEY  = 'FURLONG_SURVEY';
    const FUSS            = 'FUSS';
    const GIGAMETER       = 'GIGAMETER';
    const GIGAPARSEC      = 'GIGAPARSEC';
    const GNATS_EYE       = 'GNATS_EYE';
    const GOAD            = 'GOAD';
    const GRY             = 'GRY';
    const HAIRS_BREADTH   = 'HAIRS_BREADTH';
    const HAND            = 'HAND';
    const HANDBREADTH     = 'HANDBREADTH';
    const HAT             = 'HAT';
    const HECTOMETER      = 'HECTOMETER';
    const HEER            = 'HEER';
    const HIRO            = 'HIRO';
    const HUBBLE          = 'HUBBLE';
    const HVAT            = 'HVAT';
    const INCH            = 'INCH';
    const IRON            = 'IRON';
    const KEN             = 'KEN';
    const KERAT           = 'KERAT';
    const KILOFOOT        = 'KILOFOOT';
    const KILOMETER       = 'KILOMETER';
    const KILOPARSEC      = 'KILOPARSEC';
    const KILOYARD        = 'KILOYARD';
    const KIND            = 'KIND';
    const KLAFTER         = 'KLAFTER';
    const KLAFTER_SWISS   = 'KLAFTER_SWISS';
    const KLICK           = 'KLICK';
    const KYU             = 'KYU';
    const LAP_ANCIENT     = 'LAP_ANCIENT';
    const LAP             = 'LAP';
    const LAP_POOL        = 'LAP_POOL';
    const LEAGUE_ANCIENT  = 'LEAGUE_ANCIENT';
    const LEAGUE_NAUTIC   = 'LEAGUE_NAUTIC';
    const LEAGUE_UK_NAUTIC= 'LEAGUE_UK_NAUTIC';
    const LEAGUE          = 'LEAGUE';
    const LEAGUE_US       = 'LEAGUE_US';
    const LEAP            = 'LEAP';
    const LEGOA           = 'LEGOA';
    const LEGUA           = 'LEGUA';
    const LEGUA_US        = 'LEGUA_US';
    const LEGUA_SPAIN_OLD = 'LEGUA_SPAIN_OLD';
    const LEGUA_SPAIN     = 'LEGUA_SPAIN';
    const LI_ANCIENT      = 'LI_ANCIENT';
    const LI_IMPERIAL     = 'LI_IMPERIAL';
    const LI              = 'LI';
    const LIEUE           = 'LIEUE';
    const LIEUE_METRIC    = 'LIEUE_METRIC';
    const LIEUE_NAUTIC    = 'LIEUE_NAUTIC';
    const LIGHT_SECOND    = 'LIGHT_SECOND';
    const LIGHT_MINUTE    = 'LIGHT_MINUTE';
    const LIGHT_HOUR      = 'LIGHT_HOUR';
    const LIGHT_DAY       = 'LIGHT_DAY';
    const LIGHT_YEAR      = 'LIGHT_YEAR';
    const LIGNE           = 'LIGNE';
    const LIGNE_SWISS     = 'LIGNE_SWISS';
    const LINE            = 'LINE';
    const LINE_SMALL      = 'LINE_SMALL';
    const LINK            = 'LINK';
    const LINK_ENGINEER   = 'LINK_ENGINEER';
    const LUG             = 'LUG';
    const LUG_GREAT       = 'LUG_GREAT';
    const MARATHON        = 'MARATHON';
    const MARK_TWAIN      = 'MARK_TWAIN';
    const MEGAMETER       = 'MEGAMETER';
    const MEGAPARSEC      = 'MEGAPARSEC';
    const MEILE_AUSTRIAN  = 'MEILE_AUSTRIAN';
    const MEILE           = 'MEILE';
    const MEILE_GERMAN    = 'MEILE_GERMAN';
    const METER           = 'METER';
    const METRE           = 'METRE';
    const METRIC_MILE     = 'METRIC_MILE';
    const METRIC_MILE_US  = 'METRIC_MILE_US';
    const MICROINCH       = 'MICROINCH';
    const MICROMETER      = 'MICROMETER';
    const MICROMICRON     = 'MICROMICRON';
    const MICRON          = 'MICRON';
    const MIGLIO          = 'MIGLIO';
    const MIIL            = 'MIIL';
    const MIIL_DENMARK    = 'MIIL_DENMARK';
    const MIIL_SWEDISH    = 'MIIL_SWEDISH';
    const MIL             = 'MIL';
    const MIL_SWEDISH     = 'MIL_SWEDISH';
    const MILE_UK         = 'MILE_UK';
    const MILE_IRISH      = 'MILE_IRISH';
    const MILE            = 'MILE';
    const MILE_NAUTIC     = 'MILE_NAUTIC';
    const MILE_NAUTIC_UK  = 'MILE_NAUTIC_UK';
    const MILE_NAUTIC_US  = 'MILE_NAUTIC_US';
    const MILE_ANCIENT    = 'MILE_ANCIENT';
    const MILE_SCOTTISH   = 'MILE_SCOTTISH';
    const MILE_STATUTE    = 'MILE_STATUTE';
    const MILE_US         = 'MILE_US';
    const MILHA           = 'MILHA';
    const MILITARY_PACE   = 'MILITARY_PACE';
    const MILITARY_PACE_DOUBLE = 'MILITARY_PACE_DOUBLE';
    const MILLA           = 'MILLA';
    const MILLE           = 'MILLE';
    const MILLIARE        = 'MILLIARE';
    const MILLIMETER      = 'MILLIMETER';
    const MILLIMICRON     = 'MILLIMICRON';
    const MKONO           = 'MKONO';
    const MOOT            = 'MOOT';
    const MYRIAMETER      = 'MYRIAMETER';
    const NAIL            = 'NAIL';
    const NANOMETER       = 'NANOMETER';
    const NANON           = 'NANON';
    const PACE            = 'PACE';
    const PACE_ROMAN      = 'PACE_ROMAN';
    const PALM_DUTCH      = 'PALM_DUTCH';
    const PALM_UK         = 'PALM_UK';
    const PALM            = 'PALM';
    const PALMO_PORTUGUESE= 'PALMO_PORTUGUESE';
    const PALMO           = 'PALMO';
    const PALMO_US        = 'PALMO_US';
    const PARASANG        = 'PARASANG';
    const PARIS_FOOT      = 'PARIS_FOOT';
    const PARSEC          = 'PARSEC';
    const PE              = 'PE';
    const PEARL           = 'PEARL';
    const PERCH           = 'PERCH';
    const PERCH_IRELAND   = 'PERCH_IRELAND';
    const PERTICA         = 'PERTICA';
    const PES             = 'PES';
    const PETAMETER       = 'PETAMETER';
    const PICA            = 'PICA';
    const PICOMETER       = 'PICOMETER';
    const PIE_ARGENTINA   = 'PIE_ARGENTINA';
    const PIE_ITALIC      = 'PIE_ITALIC';
    const PIE             = 'PIE';
    const PIE_US          = 'PIE_US';
    const PIED_DE_ROI     = 'PIED_DE_ROI';
    const PIK             = 'PIK';
    const PIKE            = 'PIKE';
    const POINT_ADOBE     = 'POINT_ADOBE';
    const POINT           = 'POINT';
    const POINT_DIDOT     = 'POINT_DIDOT';
    const POINT_TEX       = 'POINT_TEX';
    const POLE            = 'POLE';
    const POLEGADA        = 'POLEGADA';
    const POUCE           = 'POUCE';
    const PU              = 'PU';
    const PULGADA         = 'PULGADA';
    const PYGME           = 'PYGME';
    const Q               = 'Q';
    const QUADRANT        = 'QUADRANT';
    const QUARTER         = 'QUARTER';
    const QUARTER_CLOTH   = 'QUARTER_CLOTH';
    const QUARTER_PRINT   = 'QUARTER_PRINT';
    const RANGE           = 'RANGE';
    const REED            = 'REED';
    const RI              = 'RI';
    const RIDGE           = 'RIDGE';
    const RIVER           = 'RIVER';
    const ROD             = 'ROD';
    const ROD_SURVEY      = 'ROD_SURVEY';
    const ROEDE           = 'ROEDE';
    const ROOD            = 'ROOD';
    const ROPE            = 'ROPE';
    const ROYAL_FOOT      = 'ROYAL_FOOT';
    const RUTE            = 'RUTE';
    const SADZHEN         = 'SADZHEN';
    const SAGENE          = 'SAGENE';
    const SCOTS_FOOT      = 'SCOTS_FOOT';
    const SCOTS_MILE      = 'SCOTS_MILE';
    const SEEMEILE        = 'SEEMEILE';
    const SHACKLE         = 'SHACKLE';
    const SHAFTMENT       = 'SHAFTMENT';
    const SHAFTMENT_ANCIENT = 'SHAFTMENT_ANCIENT';
    const SHAKU           = 'SHAKU';
    const SIRIOMETER      = 'SIRIOMETER';
    const SMOOT           = 'SMOOT';
    const SPAN            = 'SPAN';
    const SPAT            = 'SPAT';
    const STADIUM         = 'STADIUM';
    const STEP            = 'STEP';
    const STICK           = 'STICK';
    const STORY           = 'STORY';
    const STRIDE          = 'STRIDE';
    const STRIDE_ROMAN    = 'STRIDE_ROMAN';
    const TENTHMETER      = 'TENTHMETER';
    const TERAMETER       = 'TERAMETER';
    const THOU            = 'THOU';
    const TOISE           = 'TOISE';
    const TOWNSHIP        = 'TOWNSHIP';
    const T_SUN           = 'T_SUN';
    const TU              = 'TU';
    const TWAIN           = 'TWAIN';
    const TWIP            = 'TWIP';
    const U               = 'U';
    const VARA_CALIFORNIA = 'VARA_CALIFORNIA';
    const VARA_MEXICAN    = 'VARA_MEXICAN';
    const VARA_PORTUGUESE = 'VARA_PORTUGUESE';
    const VARA_AMERICA    = 'VARA_AMERICA';
    const VARA            = 'VARA';
    const VARA_TEXAS      = 'VARA_TEXAS';
    const VERGE           = 'VERGE';
    const VERSHOK         = 'VERSHOK';
    const VERST           = 'VERST';
    const WAH             = 'WAH';
    const WERST           = 'WERST';
    const X_UNIT          = 'X_UNIT';
    const YARD            = 'YARD';
    const YOCTOMETER      = 'YOCTOMETER';
    const YOTTAMETER      = 'YOTTAMETER';
    const ZEPTOMETER      = 'ZEPTOMETER';
    const ZETTAMETER      = 'ZETTAMETER';
    const ZOLL            = 'ZOLL';
    const ZOLL_SWISS      = 'ZOLL_SWISS';

    protected $_UNITS = array(
        'AGATE'           => array(array('' => 0.0254, '/' => 72), 'agate'),
        'ALEN_DANISH'     => array(0.6277,           'alen'),
        'ALEN'            => array(0.6,              'alen'),
        'ALEN_SWEDISH'    => array(0.5938,           'alen'),
        'ANGSTROM'        => array(1.0e-10,          'Å'),
        'ARMS'            => array(0.7,              'arms'),
        'ARPENT_CANADIAN' => array(58.47,            'arpent'),
        'ARPENT'          => array(58.471308,        'arpent'),
        'ARSHEEN'         => array(0.7112,           'arsheen'),
        'ARSHIN'          => array(1.04,             'arshin'),
        'ARSHIN_IRAQ'     => array(74.5,             'arshin'),
        'ASTRONOMICAL_UNIT' => array(149597870691,   'AU'),
        'ATTOMETER'       => array(1.0e-18,          'am'),
        'BAMBOO'          => array(3.2,              'bamboo'),
        'BARLEYCORN'      => array(0.0085,           'barleycorn'),
        'BEE_SPACE'       => array(0.0065,           'bee space'),
        'BICRON'          => array(1.0e-12,          '��'),
        'BLOCK_US_EAST'   => array(80.4672,          'block'),
        'BLOCK_US_WEST'   => array(100.584,          'block'),
        'BLOCK_US_SOUTH'  => array(160.9344,         'block'),
        'BOHR'            => array(52.918e-12,       'a�'),
        'BRACCIO'         => array(0.7,              'braccio'),
        'BRAZA_ARGENTINA' => array(1.733,            'braza'),
        'BRAZA'           => array(1.67,             'braza'),
        'BRAZA_US'        => array(1.693,            'braza'),
        'BUTTON'          => array(0.000635,         'button'),
        'CABLE_US'        => array(219.456,          'cable'),
        'CABLE_UK'        => array(185.3184,         'cable'),
        'CALIBER'         => array(0.0254,           'cal'),
        'CANA'            => array(2,                'cana'),
        'CAPE_FOOT'       => array(0.314858,         'cf'),
        'CAPE_INCH'       => array(array('' => 0.314858,'/' => 12), 'ci'),
        'CAPE_ROOD'       => array(3.778296,         'cr'),
        'CENTIMETER'      => array(0.01,             'cm'),
        'CHAIN'           => array(array('' => 79200,'/' => 3937),  'ch'),
        'CHAIN_ENGINEER'  => array(30.48,            'ch'),
        'CHIH'            => array(0.35814,          "ch'ih"),
        'CHINESE_FOOT'    => array(0.371475,         'ft'),
        'CHINESE_INCH'    => array(0.0371475,        'in'),
        'CHINESE_MILE'    => array(557.21,           'mi'),
        'CHINESE_YARD'    => array(0.89154,          'yd'),
        'CITY_BLOCK_US_EAST'  => array(80.4672,      'block'),
        'CITY_BLOCK_US_WEST'  => array(100.584,      'block'),
        'CITY_BLOCK_US_SOUTH' => array(160.9344,     'block'),
        'CLICK'           => array(1000,             'click'),
        'CUADRA'          => array(84,               'cuadra'),
        'CUADRA_ARGENTINA'=> array(130,              'cuadra'),
        'Length:CUBIT_EGYPT'      => array(0.45,             'cubit'),
        'CUBIT_ROYAL'     => array(0.5235,           'cubit'),
        'CUBIT_UK'        => array(0.4572,           'cubit'),
        'CUBIT'           => array(0.444,            'cubit'),
        'CUERDA'          => array(21,               'cda'),
        'DECIMETER'       => array(0.1,              'dm'),
        'DEKAMETER'       => array(10,               'dam'),
        'DIDOT_POINT'     => array(0.000377,         'didot point'),
        'DIGIT'           => array(0.019,            'digit'),
        'DIRAA'           => array(0.58,             ''),
        'DONG'            => array(array('' => 7,'/' => 300), 'dong'),
        'DOUZIEME_WATCH'  => array(0.000188,         'douzi�me'),
        'DOUZIEME'        => array(0.00017638888889, 'douzi�me'),
        'DRA_IRAQ'        => array(0.745,            'dra'),
        'DRA'             => array(0.7112,           'dra'),
        'EL'              => array(0.69,             'el'),
        'ELL'             => array(1.143,            'ell'),
        'ELL_SCOTTISH'    => array(0.945,            'ell'),
        'ELLE'            => array(0.6,              'ellen'),
        'ELLE_VIENNA'     => array(0.7793,           'ellen'),
        'EM'              => array(0.0042175176,     'em'),
        'ESTADIO_PORTUGAL'=> array(261,              'estadio'),
        'ESTADIO'         => array(174,              'estadio'),
        'EXAMETER'        => array(1.0e+18,          'Em'),
        'FADEN_AUSTRIA'   => array(1.8965,           'faden'),
        'FADEN'           => array(1.8,              'faden'),
        'FALL'            => array(6.858,            'fall'),
        'FALL_SCOTTISH'   => array(5.67,             'fall'),
        'FATHOM'          => array(1.8288,           'fth'),
        'FATHOM_ANCIENT'  => array(1.829,            'fth'),
        'FAUST'           => array(0.10536,          'faust'),
        'FEET_OLD_CANADIAN' => array(0.325,          'ft'),
        'FEET_EGYPT'      => array(0.36,             'ft'),
        'FEET_FRANCE'     => array(0.3248406,        'ft'),
        'FEET'            => array(0.3048,           'ft'),
        'FEET_IRAQ'       => array(0.316,            'ft'),
        'FEET_NETHERLAND' => array(0.28313,          'ft'),
        'FEET_ITALIC'     => array(0.296,            'ft'),
        'FEET_SURVEY'     => array(array('' => 1200, '/' => 3937), 'ft'),
        'FEMTOMETER'      => array(1.0e-15,          'fm'),
        'FERMI'           => array(1.0e-15,          'f'),
        'FINGER'          => array(0.1143,           'finger'),
        'FINGERBREADTH'   => array(0.01905,          'fingerbreadth'),
        'FIST'            => array(0.1,              'fist'),
        'FOD'             => array(0.3141,           'fod'),
        'FOOT_EGYPT'      => array(0.36,             'ft'),
        'FOOT_FRANCE'     => array(0.3248406,        'ft'),
        'FOOT'            => array(0.3048,           'ft'),
        'FOOT_IRAQ'       => array(0.316,            'ft'),
        'FOOT_NETHERLAND' => array(0.28313,          'ft'),
        'FOOT_ITALIC'     => array(0.296,            'ft'),
        'FOOT_SURVEY'     => array(array('' => 1200, '/' => 3937), 'ft'),
        'FOOTBALL_FIELD_CANADA' => array(100.584,    'football field'),
        'FOOTBALL_FIELD_US'     => array(91.44,      'football field'),
        'FOOTBALL_FIELD'  => array(109.728,          'football field'),
        'FURLONG'         => array(201.168,          'fur'),
        'FURLONG_SURVEY'  => array(array('' => 792000, '/' => 3937), 'fur'),
        'FUSS'            => array(0.31608,          'fuss'),
        'GIGAMETER'       => array(1.0e+9,           'Gm'),
        'GIGAPARSEC'      => array(30.85678e+24,     'Gpc'),
        'GNATS_EYE'       => array(0.000125,         "gnat's eye"),
        'GOAD'            => array(1.3716,           'goad'),
        'GRY'             => array(0.000211667,      'gry'),
        'HAIRS_BREADTH'   => array(0.0001,           "hair's breadth"),
        'HAND'            => array(0.1016,           'hand'),
        'HANDBREADTH'     => array(0.08,             "hand's breadth"),
        'HAT'             => array(0.5,              'hat'),
        'HECTOMETER'      => array(100,              'hm'),
        'HEER'            => array(73.152,           'heer'),
        'HIRO'            => array(1.818,            'hiro'),
        'HUBBLE'          => array(9.4605e+24,       'hubble'),
        'HVAT'            => array(1.8965,           'hvat'),
        'INCH'            => array(0.0254,           'in'),
        'IRON'            => array(array('' => 0.0254, '/' => 48), 'iron'),
        'KEN'             => array(1.818,            'ken'),
        'KERAT'           => array(0.0286,           'kerat'),
        'KILOFOOT'        => array(304.8,            'kft'),
        'KILOMETER'       => array(0.001,            'km'),
        'KILOPARSEC'      => array(3.0856776e+19,    'kpc'),
        'KILOYARD'        => array(914.4,            'kyd'),
        'KIND'            => array(0.5,              'kind'),
        'KLAFTER'         => array(1.8965,           'klafter'),
        'KLAFTER_SWISS'   => array(1.8,              'klafter'),
        'KLICK'           => array(1000,             'klick'),
        'KYU'             => array(0.00025,          'kyu'),
        'LAP_ANCIENT'     => array(402.336,          ''),
        'LAP'             => array(400,              'lap'),
        'LAP_POOL'        => array(100,              'lap'),
        'LEAGUE_ANCIENT'  => array(2275,             'league'),
        'LEAGUE_NAUTIC'   => array(5556,             'league'),
        'LEAGUE_UK_NAUTIC'=> array(5559.552,         'league'),
        'LEAGUE'          => array(4828,             'league'),
        'LEAGUE_US'       => array(4828.0417,        'league'),
        'LEAP'            => array(2.0574,           'leap'),
        'LEGOA'           => array(6174.1,           'legoa'),
        'LEGUA'           => array(4200,             'legua'),
        'LEGUA_US'        => array(4233.4,           'legua'),
        'LEGUA_SPAIN_OLD' => array(4179.4,           'legua'),
        'LEGUA_SPAIN'     => array(6680,             'legua'),
        'LI_ANCIENT'      => array(500,              'li'),
        'LI_IMPERIAL'     => array(644.65,           'li'),
        'LI'              => array(500,              'li'),
        'LIEUE'           => array(3898,             'lieue'),
        'LIEUE_METRIC'    => array(4000,             'lieue'),
        'LIEUE_NAUTIC'    => array(5556,             'lieue'),
        'LIGHT_SECOND'    => array(299792458,        'light second'),
        'LIGHT_MINUTE'    => array(17987547480,      'light minute'),
        'LIGHT_HOUR'      => array(1079252848800,    'light hour'),
        'LIGHT_DAY'       => array(25902068371200,   'light day'),
        'LIGHT_YEAR'      => array(9460528404879000, 'ly'),
        'LIGNE'           => array(0.0021167,        'ligne'),
        'LIGNE_SWISS'     => array(0.002256,         'ligne'),
        'LINE'            => array(0.0021167,        'li'),
        'LINE_SMALL'      => array(0.000635,         'li'),
        'LINK'            => array(array('' => 792,'/' => 3937), 'link'),
        'LINK_ENGINEER'   => array(0.3048,           'link'),
        'LUG'             => array(5.0292,           'lug'),
        'LUG_GREAT'       => array(6.4008,           'lug'),
        'MARATHON'        => array(42194.988,        'marathon'),
        'MARK_TWAIN'      => array(3.6576074,        'mark twain'),
        'MEGAMETER'       => array(1000000,          'Mm'),
        'MEGAPARSEC'      => array(3.085677e+22,     'Mpc'),
        'MEILE_AUSTRIAN'  => array(7586,             'meile'),
        'MEILE'           => array(7412.7,           'meile'),
        'MEILE_GERMAN'    => array(7532.5,           'meile'),
        'METER'           => array(1,                'm'),
        'METRE'           => array(1,                'm'),
        'METRIC_MILE'     => array(1500,             'metric mile'),
        'METRIC_MILE_US'  => array(1600,             'metric mile'),
        'MICROINCH'       => array(2.54e-08,         '�in'),
        'MICROMETER'      => array(0.000001,         '�m'),
        'MICROMICRON'     => array(1.0e-12,          '��'),
        'MICRON'          => array(0.000001,         '�'),
        'MIGLIO'          => array(1488.6,           'miglio'),
        'MIIL'            => array(7500,             'miil'),
        'MIIL_DENMARK'    => array(7532.5,           'miil'),
        'MIIL_SWEDISH'    => array(10687,            'miil'),
        'MIL'             => array(0.0000254,        'mil'),
        'MIL_SWEDISH'     => array(10000,            'mil'),
        'MILE_UK'         => array(1609,             'mi'),
        'MILE_IRISH'      => array(2048,             'mi'),
        'MILE'            => array(1609.344,         'mi'),
        'MILE_NAUTIC'     => array(1852,             'mi'),
        'MILE_NAUTIC_UK'  => array(1853.184,         'mi'),
        'MILE_NAUTIC_US'  => array(1852,             'mi'),
        'MILE_ANCIENT'    => array(1520,             'mi'),
        'MILE_SCOTTISH'   => array(1814,             'mi'),
        'MILE_STATUTE'    => array(1609.344,         'mi'),
        'MILE_US'         => array(array('' => 6336000,'/' => 3937), 'mi'),
        'MILHA'           => array(2087.3,           'milha'),
        'MILITARY_PACE'   => array(0.762,            'mil. pace'),
        'MILITARY_PACE_DOUBLE' => array(0.9144,      'mil. pace'),
        'MILLA'           => array(1392,             'milla'),
        'MILLE'           => array(1949,             'mille'),
        'MILLIARE'        => array(0.001478,         'milliare'),
        'MILLIMETER'      => array(0.001,            'mm'),
        'MILLIMICRON'     => array(1.0e-9,           'm�'),
        'MKONO'           => array(0.4572,           'mkono'),
        'MOOT'            => array(0.0762,           'moot'),
        'MYRIAMETER'      => array(10000,            'mym'),
        'NAIL'            => array(0.05715,          'nail'),
        'NANOMETER'       => array(1.0e-9,           'nm'),
        'NANON'           => array(1.0e-9,           'nanon'),
        'PACE'            => array(1.524,            'pace'),
        'PACE_ROMAN'      => array(1.48,             'pace'),
        'PALM_DUTCH'      => array(0.10,             'palm'),
        'PALM_UK'         => array(0.075,            'palm'),
        'PALM'            => array(0.2286,           'palm'),
        'PALMO_PORTUGUESE'=> array(0.22,             'palmo'),
        'PALMO'           => array(0.20,             'palmo'),
        'PALMO_US'        => array(0.2117,           'palmo'),
        'PARASANG'        => array(6000,             'parasang'),
        'PARIS_FOOT'      => array(0.3248406,        'paris foot'),
        'PARSEC'          => array(3.0856776e+16,    'pc'),
        'PE'              => array(0.33324,          'p�'),
        'PEARL'           => array(0.001757299,      'pearl'),
        'PERCH'           => array(5.0292,           'perch'),
        'PERCH_IRELAND'   => array(6.4008,           'perch'),
        'PERTICA'         => array(2.96,             'pertica'),
        'PES'             => array(0.2967,           'pes'),
        'PETAMETER'       => array(1.0e+15,          'Pm'),
        'PICA'            => array(0.0042175176,     'pi'),
        'PICOMETER'       => array(1.0e-12,          'pm'),
        'PIE_ARGENTINA'   => array(0.2889,           'pie'),
        'PIE_ITALIC'      => array(0.298,            'pie'),
        'PIE'             => array(0.2786,           'pie'),
        'PIE_US'          => array(0.2822,           'pie'),
        'PIED_DE_ROI'     => array(0.3248406,        'pied de roi'),
        'PIK'             => array(0.71,             'pik'),
        'PIKE'            => array(0.71,             'pike'),
        'POINT_ADOBE'     => array(array('' => 0.3048, '/' => 864), 'pt'),
        'POINT'           => array(0.00035,          'pt'),
        'POINT_DIDOT'     => array(0.000377,         'pt'),
        'POINT_TEX'       => array(0.0003514598035,  'pt'),
        'POLE'            => array(5.0292,           'pole'),
        'POLEGADA'        => array(0.02777,          'polegada'),
        'POUCE'           => array(0.02707,          'pouce'),
        'PU'              => array(1.7907,           'pu'),
        'PULGADA'         => array(0.02365,          'pulgada'),
        'PYGME'           => array(0.346,            'pygme'),
        'Q'               => array(0.00025,          'q'),
        'QUADRANT'        => array(10001300,         'quad'),
        'QUARTER'         => array(402.336,          'Q'),
        'QUARTER_CLOTH'   => array(0.2286,           'Q'),
        'QUARTER_PRINT'   => array(0.00025,          'Q'),
        'RANGE'           => array(array('' => 38016000,'/' => 3937), 'range'),
        'REED'            => array(2.679,            'reed'),
        'RI'              => array(3927,             'ri'),
        'RIDGE'           => array(6.1722,           'ridge'),
        'RIVER'           => array(2000,             'river'),
        'ROD'             => array(5.0292,           'rd'),
        'ROD_SURVEY'      => array(array('' => 19800, '/' => 3937), 'rd'),
        'ROEDE'           => array(10,               'roede'),
        'ROOD'            => array(3.7783,           'rood'),
        'ROPE'            => array(3.7783,           'rope'),
        'ROYAL_FOOT'      => array(0.3248406,        'royal foot'),
        'RUTE'            => array(3.75,             'rute'),
        'SADZHEN'         => array(2.1336,           'sadzhen'),
        'SAGENE'          => array(2.1336,           'sagene'),
        'SCOTS_FOOT'      => array(0.30645,          'scots foot'),
        'SCOTS_MILE'      => array(1814.2,           'scots mile'),
        'SEEMEILE'        => array(1852,             'seemeile'),
        'SHACKLE'         => array(27.432,           'shackle'),
        'SHAFTMENT'       => array(0.15124,          'shaftment'),
        'SHAFTMENT_ANCIENT' => array(0.165,          'shaftment'),
        'SHAKU'           => array(0.303,            'shaku'),
        'SIRIOMETER'      => array(1.4959787e+17,    'siriometer'),
        'SMOOT'           => array(1.7018,           'smoot'),
        'SPAN'            => array(0.2286,           'span'),
        'SPAT'            => array(1.0e+12,          'spat'),
        'STADIUM'         => array(185,              'stadium'),
        'STEP'            => array(0.762,            'step'),
        'STICK'           => array(3.048,            'stk'),
        'STORY'           => array(3.3,              'story'),
        'STRIDE'          => array(1.524,            'stride'),
        'STRIDE_ROMAN'    => array(1.48,             'stride'),
        'TENTHMETER'      => array(1.0e-10,          'tenth-meter'),
        'TERAMETER'       => array(1.0e+12,          'Tm'),
        'THOU'            => array(0.0000254,        'thou'),
        'TOISE'           => array(1.949,            'toise'),
        'TOWNSHIP'        => array(array('' => 38016000,'/' => 3937), 'twp'),
        'T_SUN'           => array(0.0358,           "t'sun"),
        'TU'              => array(161130,           'tu'),
        'TWAIN'           => array(3.6576074,        'twain'),
        'TWIP'            => array(0.000017639,      'twip'),
        'U'               => array(0.04445,          'U'),
        'VARA_CALIFORNIA' => array(0.83820168,       'vara'),
        'VARA_MEXICAN'    => array(0.83802,          'vara'),
        'VARA_PORTUGUESE' => array(1.10,             'vara'),
        'VARA_AMERICA'    => array(0.864,            'vara'),
        'VARA'            => array(0.83587,          'vara'),
        'VARA_TEXAS'      => array(0.84666836,       'vara'),
        'VERGE'           => array(0.9144,           'verge'),
        'VERSHOK'         => array(0.04445,          'vershok'),
        'VERST'           => array(1066.8,           'verst'),
        'WAH'             => array(2,                'wah'),
        'WERST'           => array(1066.8,           'werst'),
        'X_UNIT'          => array(1.0020722e-13,    'Xu'),
        'YARD'            => array(0.9144,           'yd'),
        'YOCTOMETER'      => array(1.0e-24,          'ym'),
        'YOTTAMETER'      => array(1.0e+24,          'Ym'),
        'ZEPTOMETER'      => array(1.0e-21,          'zm'),
        'ZETTAMETER'      => array(1.0e+21,          'Zm'),
        'ZOLL'            => array(0.02634,          'zoll'),
        'ZOLL_SWISS'      => array(0.03,             'zoll'),
        'STANDARD'        => 'METER'
    );
}