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Image analysis study plot, NW apex by Chris Fastie

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About This Gigapan

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Taken by
Chris Fastie Chris Fastie
Explore score
1
Size
1.57 Gigapixels
Views
1626
Date added
Jul 13, 2010
Date taken
Jun 27, 2010
Gear

Nikkor P C 105mm f/2.5, Nikon...

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Description

I compared three methods of determining basal area (cross sectional area of trunks) in this stand of Alaskan birch at the Bonanza Creek LTER site near Fairbanks, Alaska. The diameter of each birch tree was measured in a 42 x 38 m plot surrounding this and two other sample/photo points. This provided a measure of the actual basal area in the plot (30.0 m²/ha). A standard field method (referred to as plotless, prism, or Bitterlich sampling) was used to select trees which subtended at least a threshold angle (1.736°) from this viewpoint. This sample included 12 trees (103, 70, 69, 51, 50, 49, 48, 46, 37, 74, 72, 89) and provided an estimate of basal area of 27.6 m²/ha. An equivalent method was performed on this 360° panoramic image using horizontal pixel counts to represent the subtending angle. One tree (89) could not be assessed in the image because it was obscured by a closer tree, so it was not tallied, and the resulting basal area estimate was 25.3 m²/ha. The field- and image-based methods were repeated at two replicate sample/photo points (see gigapan.org/gigapans/54319/ and gigapan.org/gigapans/54276/).
This study was presented at the Fine International Conference on Gigapixel Imaging for Science (www.cmu.edu/events/gigapixel-science Will open in a new tab or window/). The proceedings paper is available here: fastie.net/wp-content/uploads/2010/11/Fastie-Fine-Conference-m-09-06-10.pdf Will open in a new tab or window. Video of the conference presentation is here: www.youtube.com/watch?v=gBQtVZfx9lc&playnext=1&list=PL6D6265673AAA1E78 Will open in a new tab or window.


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Stitcher Notes

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GigaPan Stitch version 1.1.0963 (Windows)
Panorama size: 1571 megapixels (86304 x 18204 pixels)
Input images: 504 (42 columns by 12 rows)
Field of view: 360.0 degrees wide by 75.9 degrees high (top=42.9, bottom=-33.0)
Settings:
Use larger blending region
Original image properties:
Camera make: NIKON CORPORATION
Camera model: NIKON D40
Image size: 3008x2000 (6.0 megapixels)
Capture time: unknown
Aperture: unknown
Exposure time: unknown
ISO: unknown
Focal length (35mm equiv.): unknown
White balance: unknown
Exposure mode: unknown
Horizontal overlap: 30.1 to 63.0 percent
Vertical overlap: 24.1 to 40.4 percent
Computer stats: 3581.58 MB RAM, 2 CPUs
Total time 1:19:14 (9.4 seconds per picture)
Alignment: 37:55, Projection: 4:26, Blending: 36:52
(Preview finished in 47:12)

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