[GRASS-dev] v.to.db option=slope

[Hamish]

Markus Neteler wrote:
> to verify exactly the coastline length for Italy which is given
> incorrectly in the ASPRS Grid & datums paper on Italy.


to be pedantic:

coastline length is a classic fractal problem with no real answer.

the best you can do is assume the dataset was digitized with the same
fractal depth throughout (and that's a bad assumption) and then compare
relative sections of the vector as a ratio.

"The empirical evidence suggests a rule which, if extrapolated, shows
that the measured length increases without limit as the measurement
scale decreases towards zero."

http://en.wikipedia.org/wiki/How_Long_Is_the_Coast_of_Britain%3F_Statistical_Self-Similarity_and_Fractional_Dimension

or did you get different answers from the same dataset, reprojected?


Hamish