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| GeoCommunity Mailing List |
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| Mailing List Archives |
| Subject: | Re: [gislist] Global area calculations |
| Date: |
06/30/2005 02:55:01 AM |
| From: |
Brian Klinkenberg |
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Hi,
I forgot to make something clear -- the file is in lat/long,
so obtaining the areas directly is not possible. Standard
'global' projections introduce too much error in the results,
so they aren't a choice.
Cheers,
Brian
> Hi,
>
> I have a student who has a geodatabase that contains protected areas from
> around the world. She needs to calculate the areas (ha) of each of the
> areas. What means would people suggest as the best approach to take? She
> could:
>
> 1) calculate the areas using lat/long, but apply a correction factor
> (complicated if the areas extend considerably north-south).
>
> 2) divide the world into blocks and project each block using the most
> suitable projection, and then calculate the areas. The question then
> becomes, what projection(s) would be best, in order to reduce the number of
> blocks she needs to split the world into.
>
> 3) any other choices?
>
> Any guidance appreciated!
>
> Thanks,
>
> Brian
>
> Brian Klinkenberg http://www.geog.ubc.ca/~brian
> Department of Geography, UBC
> 1984 West Mall Visit http://eflora.bc.ca
> Vancouver, B V6T 1Z2
> 604.822.3534 (office)
> 604.822.6150 (fax)
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