Talk:Hectare

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I agree with and have added to seglea's comment on the usage of 'hectares'.

I have observed in several Wikipedia entries that Bobblewik has changed measurements in hectares to square metres, and in some instances to square kilometres, despite the general practice of describing such land areas in hectares. (Notably, equivalent measurements in acres have not been changed to square feet.) This is objectionable. It seems best to use metric measures in Wikipedia in the way that people who use the metric system use them; the point is to communicate clearly, after all.

In my experience (Australia) hectares are used for land measurement except for small (e.g. urban residential) properties when square metres are used as they are for describing floor areas of buildings. Square kilometres are used only to describe vast outback properties. However, many people are still more familiar with acres and most historical documents describe land areas using acres.

It would be more useful to work at ensuring that all land areas in entries are described in both hectares and acres, rather than conducting purges of the rather useful hectare.

R Jones 22 April 06


Given that some people use acres, and some hectares, it might be an idea to state the relative areas of each in relation to each other. JTD 07:48 Jan 11, 2003 (UTC)


The word "hectare" is a contraction of "hectametre squared".

Rather, I think, it is a contraction of hecto ("hundred") and are, just as hectolitre from hecto and litre.
Sebastjan

Will double check, but I think I was right with the first juncture....
-Chimpa


it's "hect + are" -- Tarquin 09:21 14 Jun 2003 (UTC)


it would also be helpful to have a conversion to square feet (107,639 sf/hectare) -- n8dunn@lycos.com

I have reinstated the information about the way in which hectares are used world wide. I know that user:Bobblewik objects to Wikipedia using them (though s/he seems to be in a minority of one on this), but I consider the information that everyone else does use them to be valid encyclopaedic material, and I request that this should not be deleted again without a consensus on this page. seglea 06:27, 28 August 2005 (UTC)

Definition[edit]

The definition given is 10 000 m2. That the hectare is 100 ares is mentioned in the conversions section. As the word "hectare" derives from "hecto-" plus "are", shouldn't this be the other way around? Isn't the hectare defined as 100 ares? Jimp 12Oct05

how many squared kilometers?[edit]

The article states that a hectare = 0.1 km^2. However, a hectare = (100 . 100)m^2 = 10^4 m2, while a squared kilometer = 1000^2 m2 = 10^6 m2. So I think a hectare is one hundreth of a squared kilometer. I'm going to change it into the article. S Sepp 17:41, 14 August 2006 (UTC)

Well spotted - it was recently wrongly changed to 0.1 by an anon (diff). Thanks for correcting it. -- ALoan (Talk) 17:58, 14 August 2006 (UTC)
Not necessarily vandalism though, might have been an honest confusion between 0.1 square kilometres and 0.1 kilometres square which mean different things. Femto 19:08, 14 August 2006 (UTC)
Perhaps. It is the area of a square of side 0.1 km, but "One hectare is equivalent to ... 0.01 square kilometres" is pretty clear, IMHO. -- ALoan (Talk) 19:18, 14 August 2006 (UTC)

Purpose of Hectare (Explanation Section)[edit]

The article suggests that the hectare is used in place of the square meter where it 'would be cumbersome and unnecessarily precise' to do so (added here). But surely units could be given as 270,000 sq m. rather than 27ha which is equally precise and not particularly cumbersome. My view, on the basis of no hard facts at all is that the hectare is a historical hangover used predominantly in countries which transitioned from the imperial acre to the quasi-metric hectare. But I could of course be totally wrong? orizon 03:09, 21 June 2007 (UTC)

It's fully metric, just not SI. Jɪmp 05:58, 5 September 2007 (UTC)

Canadian usage[edit]

Google search shows (1) that both "hectare" and "acre" are widely used in Canada, (2) "hectare" is slightly more common, (3) "hectare" is almost universally preferred in official (government) publications and widely preferred in journalism and education, (4) "acre" is widely used in commercial contexts, notably real estate. Avt tor 23:33, 30 July 2007 (UTC)

Not true! I am a Canadian who uses hectares every day in the measurement of urban parks. Officially no one used acres. mkevlar 30 January 2016 (UTC)

BIPM SI 8th ed[edit]

BIPM have moved on. The 8th edition of SI has brought the hectare in from the cold and includes it in a group of units that are accepted for use with SI. (Table 6). The article text as it stands reflects some of the 7th edition, has been edited several times and reads awkwardly. I intend to update the article to reflect the current standing of hectare in SI by BIPM. Bleakcomb (talk) 03:42, 2 April 2008 (UTC)

Last word[edit]

Square kilometers, as in square miles, are too large for such close resolution tasks in the needs of daily life, and square meters or square yards or feet too large.

Is it possible that the last word of the first paragraph should have been 'small'?

Muddyork (talk) 05:23, 26 June 2008 (UTC)

Merge from Decare[edit]

Please see Talk:Decare. ANDROS1337 22:30, 5 July 2008 (UTC)

I have proposed merging the articles are, decare and centiare into this article. The articles decare and centiare are so short that they should be merged into other articles, while the history of the are and hectare (which I am currently writing) are so tightly intertwinned that merging the two makes sense. I propose that this article should be the "host" article as the hectare is the most widely used of the four units of measurement. Martinvl (talk) 13:05, 4 March 2010 (UTC)
I have not seen any comments on the merge proposal, so I am going ahead. It will be done gradually over the next few days. Martinvl (talk) 16:23, 12 March 2010 (UTC)

Removed some weak sentences.[edit]

Areas less than one hectare are often expressed in square metres, and areas 10,000 ha and above in square kilometres. The number of significant figures is often limited to four digits.[citation needed]

Several people have had a go at these sentences and they don't seem to be improving. The often is weak and borders on a weasel word. It is the equivalent of it often rains, which is quite true but very vague. And the reverse of the limits given is often true as well - areas less than one hectare and greater than 10,000 ha are often expressed in hectares. The problem is probably that the sentence is just POV. By the way here are some examples of hectares in use (even millions of hectares). [1]and [2]--Bleakcomb (talk) 09:48, 26 November 2008 (UTC)

When did the Metric System become Law in the UK[edit]

As one of the first year entry to college undertaking Building Construction we were amougst the first students to be educated under the METRIC ACT for the UK. We were told that this Act was past into law in 1972.

I do not have a copy of this law now, so many years on, but I know I had one and all my working life in Building Design within the Civil Service we used the METRIC SYSTEM.

So what's this talk about it coming into effect as late as 1995. This country has been metricated since 1972.

For verification see METRIC ACT 1972.

John McNamara —Preceding unsigned comment added by 86.157.226.86 (talk) 10:29, 29 March 2010 (UTC)

It became law under EU directive 80/181/EEC to use hectares and square kilometres for all “commercial, public health, public administration and public health” purposes in 1986 with the proviso that acres could be used for “purposes of land registration”. This meaning of “commercial purposes” was that if I advertised land at £x per unit area, I had to use hectares, but if I advertised a piece of land of area Y, I could express it in acres.
On 1-Jan-2010 the law changed – the scope of the directive was widened by the removal of text which limited the purposes. The meaning of the new directive has yet to be clarified by the courts. On the same day the acre ceased to be legal for purpose of land registration (in practice the Land Registry Office had stopped using the acre a number of years previously).
See European units of measurement directives. Martinvl (talk) 11:02, 29 March 2010 (UTC).

Removal of "citation needed flag" (16-Nov-2010)[edit]

I removed the Tomna form the list of synonyms for the decare as it is defined as being about 1124 square metres (see Maltese units of measurement. References for the other units of measure appear in the relevant Wikipedia articles. Martinvl (talk) 13:24, 16 November 2010 (UTC)

Thanks Martinv1 for your good faith efforts to make Wikipedia better. Actually however, Wikipedia policy does call for any substantive claim in all articles to be verifiably sourced per WP:V; this is one of the very few core wiki-policies. "Wikipedia itself is not considered an adequate source": see the section Wikipedia and sources that mirror or use it in the WP:V policy. The lone exception, where sources are not required, is disambiguation pages.
It is probably true that we need not cite every detail about any particular usage of hectare-related measurement units, but if a claim is made about the usage of some unit in this country or that (which is an assertion), then a citation should be provided that will source such claims. A very acceptable alternative is to make fewer claims in this particular article and leave the detail to be claimed, and then only sourced, in the article that covers the linked measurement.
It is no problem with me for a little more time to pass so this can be sorted out before deleting the unsourced claims, but the {{citation needed}} tags should stay until the sources are provided. Cheers. N2e (talk) 15:16, 16 November 2010 (UTC)
By the way, thanks Martinvl for adding the citations which help support the claims for Norway and Bulgaria! Wikipedia gets better all the time, little by little. N2e (talk) 15:27, 16 November 2010 (UTC)

Misleading image[edit]

The image http://en.wikipedia.org/wiki/File:Hectare.png illustrates that one are is equal to 10m^2 and that a hectare is equal to 100m^2, when in fact an are is 100m^2 and a hectare, as the article states, is 10000m^2. I think the person who produced the image does not understand what m^2 means. —Preceding unsigned comment added by 82.38.204.141 (talk) 00:46, 27 March 2011 (UTC) I get the feeling that there is a confusion between when something is x square metres and when something is x metres squared. —Preceding unsigned comment added by 82.38.204.141 (talk) 01:41, 27 March 2011 (UTC)

On the contrary - since one are has an area of 100m^2, it can be made up of 100 squares, each on 1m^2. These squares can be laid out in a larger square, that has sides of 10m. Martinvl (talk)

(Same guy from before). My bad —Preceding unsigned comment added by 82.38.204.141 (talk) 10:23, 27 March 2011 (UTC)

Size comparisons from redirected article[edit]

I don’t know how useful this information is or how best (if at all) to incorporate it into this article, but this list was at 1 E+4 m² before it redirected to here.

To help compare orders of magnitude of different areas, areas between 1 hectare (10,000 ) and 10 hectares (0.1 km²) are listed below.

Frungi (talk) 04:27, 30 November 2012 (UTC)

File:Comparison_land_area_units.svg[edit]

Comparison of 1 hectare with some Imperial and metric units of area

Referring to Martinvl's reversion of the graphic on the right on the grounds of "Doesn't add anything to the article apart from overload the graphics", I beg to differ that it helps the reader to compare the unit with other units of area. I agree that there are perhaps already too many pictures on the page, but I think some of them are less useful, e.g. the Statue of Liberty one. Does anyone have any opinion on this? Thanks, cmɢʟee୯ ͡° ̮د ͡° ੭ 19:05, 21 August 2013 (UTC)

My screen is 1920 pixels wide. I set Wikipedia in a floating window and reduced the screen to 960 pixels. The new image overran the bottom of the section into the section "Visualising a hectare" and blocked out part of the image of the pitch sizes in the subsection "International rugby field". It is unacceptable to position images where they interfere with other images.
While the image itself is a genuine attempt to incorporate all areas up to one hectare in a single presentation, the author has been over-ambitious - Unless I blow it up, the image does not tell me whether a square yard is larger, smaller or the same as a square metre. Furthermore the square yard and sqiare metre are so small compared with the hectare, all that the image tells me is that the hectare is much larger than these smaller areas.
When you present an image you have about three seconds to catch the reader's attention. In the case of this image, the reader will ask himself "What is this?". The very small text does not draw people's attention.
In short, the amount of information contained in the image is poorly presented and the way in which it distorted the exiting article by overflowing detracted even more from it. Martinvl (talk) 19:52, 21 August 2013 (UTC)

What does an hectare measure in "practical" terms ?[edit]

Although a good article, I could not find here an answer to my question: how is a piece of land REALLY measured in hectares? What I mean is that all the examples you give are "flat"; what would be appreciated is an example of a non-flat surface: what happens there? Is an "hectare" of flat land equal in terrain size to an "hectare" of slopped land or not? A.R. (alainr345) If it's not clear, for an example of what I mean, I could find this sentence on a website which seems to point to the answer being "No, it would be different in terrain size", but that applies to the term Acre: "The acre is not a measure of surface area on the actual surface of the earth, but on an imaginary, hill-less, standardized ellipsoid. That result comes from using only strictly horizontal dimensions in calculating acreage." — Preceding unsigned comment added by 205.151.119.119 (talk) 22:56, 16 March 2014 (UTC)

The definition of the are and hectare are strictly in terms of square meters on a plane. I don't believe that the application of these measures to the legal measurement of actual land is in scope for this article, as the issues are the same whether the unit is the square meter, the hectare, the acre, the square mile, etc. I'm not sure where this issue belongs -- perhaps surveying or geodesy? --Macrakis (talk) 15:02, 17 March 2014 (UTC)

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  1. ^ a b c d e See List of city squares by size