+Comparison of Area units | !Unit | SI |
1 ca | 1 m2 | |
1 a | 100 m2 | |
1 ha | 10,000 m2 | |
100 ha | 1 km2 | |
non-SI comparisons | ||
!non-SI | metric | |
0.3861 sq mi | 1 km2 | |
2.471 acre | 1 ha | |
107,639 sq ft | 1 ha | |
1 sq mi | 259.0 ha | |
1 acre | 0.4047 ha |
The hectare ( or ; symbol ha) is a unit of area defined as 10,000 square metres (100 m by 100 m), and primarily used in the measurement of land. In 1795, when the metric system was introduced, the ''are'' was defined as being 100 square metres and the hectare ('hecto-' + 'are') was thus 100 ''ares'' or 1/100 km2.
When the metric system was rationalised in 1960 with the introduction of the International System of Units (SI), international recognition of the ''are'' was withdrawn, though the hectare continued to be recognised as a "unit of measure that may be used with SI".
Although the law defined the length of the metre, there was no practical way of accurately measuring the metre (and hence the ''are'') until 1799 when the first standard metre was manufactured and adopted.
The standard metre remained in the custody of successive French governments until 1875 when, under the Convention of the Metre, its supervision passed into international control under the auspices of the General Conference on Weights and Measures (GCPM). At the first meeting of the GCPM in 1889 when a new standard metre, manufactured by Johnson Matthey & Co of London was adopted, the ''are'' and ''hectare'' were automatically redefined.
In 1960, when the metric system was updated as the International System of Units (SI), the ''are'' did not receive international recognition. The International Committee for Weights and Measures (CIPM) makes no mention of the ''are'' in the current (2006) definition of the SI, but classifies the hectare as a "Non-SI unit accepted for use with the International System of Units"
In 1972, the European Economic Community (EEC) passed directive 71/354/EEC , which catalogued the units of measure that might be used within the community. The units that were catalogued replicated the recommendations of the GCPM, supplemented by a few other units including the ''are'' (and implicitly the ''hectare'') whose use was limited to the measurement of land.
It is commonly used to measure real estate, in particular in Indonesia and in French-, Portuguese-, Slovakian-, Czech-, Polish-, Dutch-, and German-speaking countries.
In Russia and other former Soviet Union states, the "sotka" (сотка 'hundredth') is identical to the are. It is used to describe the size of suburban dacha or allotment garden plots or small city parks where the hectare would be too large.
Some countries that underwent a general conversion from traditional measurements to metric measurements (e.g. Canada) required a resurvey when units of measure in legal descriptions relating to land were converted to metric units. Others, such as South Africa, published conversion factors which were to be used ''particularly when preparing consolidation diagrams by compilation''.
In many counties the advent of metrication has meant that national units of measure were either redefined or clarified in terms of metric units. The following legacy units of area have been redefined as being equal to one hectare:
centiare | align="center" | ||||
are | |||||
decare | |||||
hectare | |||||
square kilometre | align="center" |
The most commonly used units are in bold.
One hectare is also equivalent to:
left|thumb|Waikato Stadium – Hamilton, New Zealand | image:rugbyfield.svg>right | On an international [[rugby union field the goal lines are up to 100 metres apart. Behind the goal line is the in-goal area (which is also a playing area). This area extends between 10 and 22 metres behind the goal line, giving a maximum length of 144 metres for the playing area. The maximum width of the pitch is 70 metres, giving a maximum playing area of 10,080 square metres or 1.008 hectares. |
left|thumb|150px|The Statue of Liberty – New York Harbour | image:StatueOfLibertyFootprint.svg>right |
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The [[Statue of Liberty, a gift from the French people to the American people dedicated on 28 October 1886 to commemorate the hundredth anniversary of the French and American Revolutions, is located on Liberty Island at the entrance to New York Harbour. Its base is modelled on eighteenth-century fortifications. |
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Apex (geometry)>apex of the bastions in the front of the base to those at the back (where the entrance to the statue is located) is approximately 100 m while the distance between the apexes of the left-hand and right-hand bastions is a little under 100 m. Thus, if a square were to enscribe the bastions, it would have sides of approximately 100 m, giving it an area of one hectare. |
thumb|left|200 px|Hansen Field at Western Illinois University in Macomb, Illinois incorporates an all-weather running track | image:Piste athlétisme-en.svg>thumb | Athletics tracks are found in almost every country of the world. Although many tracks consist of markings on a field of suitable size, where funds permit, specialist all-weather tracks have a rubberized artificial running surface with a grass interior (as shown in the picture and diagram). The perimeter of the inside kerb of the track is a little under 400 metres, as the actual length of the track is measured 300 mm from the inside kerb. The IAAF specifications state that the radius of the kerb is 36.5 m, from which it can be calculated that the area inside the kerb is 1.035 ha. |
Category:Units of area Category:Non-SI metric units
af:Hektaar als:Hektar ar:هكتار an:Hectaria ast:Hectárea az:Hektar bn:হেক্টর be:Гектар be-x-old:Гектар bo:ཧེག་ཐ། bs:Hektar br:Hektar bg:Хектар ca:Hectàrea cs:Hektar cy:Hectr da:Hektar de:Hektar dsb:Hektar et:Hektar el:Εκτάριο es:Hectárea eo:Hektaro eu:Hektarea fa:هکتار fr:Hectare fy:Hektare fur:Etar gd:Heactair gl:Hectárea gu:હેક્ટર hak:Kûng-khín ko:헥타르 hy:Հեկտար hsb:Hektar hr:Hektar id:Hektare os:Гектар is:Hektari it:Ettaro he:הקטאר ka:ჰექტარი sw:Hektari la:Hectarium lv:Hektārs lt:Hektaras hu:Hektár mk:Хектар ml:ഹെക്ടേർ mr:हेक्टर arz:هكتار ms:Hektar nl:Hectare nds-nl:Bunder ja:ヘクタール no:Hektar nn:Hektar oc:Ectara nds:Hektar pl:Hektar pt:Hectare ro:Hectar ru:Гектар simple:Hectare sk:Hektár sl:Hektar sr:Хектар sh:Hektar fi:Hehtaari sv:Hektar ta:எக்டேர் th:เฮกตาร์ tr:Hektar uk:Гектар vi:Hecta vls:Hectoare zh-yue:公頃 zea:Hectare bat-smg:Hektars zh:公顷This text is licensed under the Creative Commons CC-BY-SA License. This text was originally published on Wikipedia and was developed by the Wikipedia community.
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