Number calibration.pdf
From SibleyBirds
Number_calibration.pdf (file size: 175 KB, MIME type: application/pdf)
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| Created by | David Sibley |
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| Notes | A one-page quick reference designed as an aid to estimating numbers in the field. Research has shown that one of the main sources of error and variation in our estimates of numbers is the absence of a known number for "calibration". Looking at this image in the field will give a clear sense of what 100 dots look like, and will provide a sort of baseline for estimating numbers in flocks of birds. |
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{{Image fullwidth |filename=Number calibration.pdf |caption= - , . . © [[David Sibley]] }}
© David Sibley - All rights reserved
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| Date/Time | Dimensions | User | Comment | |
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| current | 03:20, 9 December 2015 | (175 KB) | David Sibley (Talk | contribs) | rearrange images and add explanation |
| 09:37, 8 December 2015 | (281 KB) | David Sibley (Talk | contribs) | reduce file size | |
| 09:27, 8 December 2015 | (1.24 MB) | David Sibley (Talk | contribs) |
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