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 <?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) 2005-2015 Zend Technologies USA Inc. (http://www.zend.com)
  * @license   http://framework.zend.com/license/new-bsd     New BSD License
  * @version   $Id$
  */
 
 /**
  * Implement needed classes
  */
 // require_once 'Zend/Measure/Abstract.php';
 // require_once 'Zend/Locale.php';
 
 /**
  * Class for handling length conversions
  *
  * @category   Zend
  * @package    Zend_Measure
  * @subpackage Zend_Measure_Length
  * @copyright  Copyright (c) 2005-2015 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
 {
     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';
 
     /**
      * Calculations for all length units
      *
      * @var array
      */
     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',          'µµ'),
         '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',       'a₀'),
         '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',         'douzième'),
         'DOUZIEME'        => array('0.00017638888889', 'douzième'),
         '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('1000',             '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',         'µin'),
         'MICROMETER'      => array('0.000001',         'µm'),
         'MICROMICRON'     => array('1.0e-12',          'µµ'),
         'MICRON'          => array('0.000001',         'µm'),
         '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',           'mµ'),
         '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',          'pé'),
         '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'
     );
 }