1 / 19

Fractal Dimension and Applications in Landscape Ecology Jiquan Chen University of Toledo

Fractal Dimension and Applications in Landscape Ecology Jiquan Chen University of Toledo Feb. 21, 2005.

sanjiv
Download Presentation

Fractal Dimension and Applications in Landscape Ecology Jiquan Chen University of Toledo

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Fractal Dimension and Applications in Landscape Ecology Jiquan Chen University of Toledo Feb. 21, 2005 The Euclidean dimension of a point is zero, of a line segment is one, a square is two, and of a cube is three. In general, the fractal dimension is not an integer, but a fractional dimensional (i.e., the origin of the term fractal by Mandelbrot 1967)

  2. Sierpinski Carpet generated by fractals

  3. So what is the dimension of the Sierpinski triangle? How do we find the exponent in this case? For this, we need logarithms. Note that, for the square, we have N^2 self-similar pieces, each with magnification factor N. So we can write: http://math.bu.edu/DYSYS/chaos-game/node6.html

  4. Self-similarity One of the basic properties of fractal images is the notion of self-similarity. This idea is easy to explain using the Sierpinski triangle. Note that S may be decomposed into 3 congruent figures, each of which is exactly 1/2 the size of S! See Figure 7. That is to say, if we magnify any of the 3 pieces of S shown in Figure 7 by a factor of 2, we obtain an exact replica of S. That is, S consists of 3 self-similar copies of itself, each with magnification factor 2.

  5. Triadic Koch Island

  6. r1=1/2, N1=2 • R2=1/4, N2=4 • D=0

  7. http://mathworld.wolfram.com/Fractal.html

  8. A geometric shape is created following the same rules or by the same processes – inducing a self-similar structure • Coastal lines • Stream networks • Number of peninsula along the Atlantic coast • Landscape structure • Movement of species • …

  9. Wiens et al. 1997, Oikos 78: 257-264

  10. Vector-Based Raster-Based

  11. Figure 11: The Sierpinski hexagon and pentagon

  12. n mice start at the corners of a regular n-gon of unit side length, each heading towards its closest neighboring mouse in a counterclockwise

More Related