When: 2008-09-18

Collection location: Sewanee, Franklin Co., Tennessee, USA [Click for map]

Who: Chris Parrish (kitparrish)

No specimen available

Piney Point, 35°12’48.33"N 85°54’14.26"W, el. 524 m

Species Lists


scale bar experimental apparatus
length of a 1cm scale bar in pixels vs. distance from the camera’s sensor to the target, for this camera (images come out of the camera at 3888 pixels wide)
ExifTool Focal Distance vs. measured distance
result: 80cm photo with scale bar 274 pixels long
Plot cm / pixel, instead of pixels / cm. One can probably find some similar triangles and simple geometry lurking here.
scale bar produced by Jason’s script!

Proposed Names

7% (2)
Recognized by sight

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