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<p>Mike</p>
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<p>For measuring the kind of distances you are mentioning I would
suggest using ellipsoidal (geodetic) distances rather than
projected distances. This is because projected distances can
become very inaccurate over large regions (depending on the
particular projection of course).<br>
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<p>If measuring areas is important consider an equal area
projection, like Albers for example, not a conformal one like
Lambert.</p>
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<p>Hope this helps.<br>
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<p>/H.<br>
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<div class="moz-cite-prefix">On 2020-10-22 07:43, MIKE MCGRADY
wrote:<br>
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cite="mid:DBAP193MB09409B8FD46C9922C9BFCBEAA21D0@DBAP193MB0940.EURP193.PROD.OUTLOOK.COM">
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I have data on tracked migratory birds, and want accurate
measures of distance travelled during migration and areas of
summering and wintering ranges. These birds are summering in
central Asia (mostly Kazakhstan and southern Russia), and
wintering in Arabia. Any advice on which projection to use? My
guess is Lambert conformal conic. I'd really like to avoid
using different projections for different phases of the birds'
annual cycle, unless absolutely necessary. </div>
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<div id="Signature">
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<div>M. J. McGrady </div>
<div>Am Rosenhugel 59</div>
<div>A-3500 Krems</div>
<div>Austria</div>
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