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About This GigaPanToggle
- Taken by
- Chris Fastie
- Explore score
- 1.57 Gigapixels
- Date added
- July 13, 2010
- Date taken
- June 27, 2010
Nikkor P C 105mm f/2.5, Nikon...
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 /). The proceedings paper is available here: fastie.net/wp-content/uploads/2010/11/Fastie-Fine-Conference-m-09-06-10.pdf . Video of the conference presentation is here: www.youtube.com/watch?v=gBQtVZfx9lc&playnext=1&list=PL6D6265673AAA1E78 .
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)
Use larger blending region
Original image properties:
Camera make: NIKON CORPORATION
Camera model: NIKON D40
Image size: 3008x2000 (6.0 megapixels)
Capture time: unknown
Exposure time: 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)