jueves, febrero 11, 2010

Nuevos algoritmos de visibilidad

Algunas colaboraciones externas aportan a SEXTANTE nuevas funcionalidades que no existían. Otras, por el contrario, mejoran lo que ya tenemos, haciéndolo más robusto o eficiente. El trabajo de Aviad Segev (Israel) está en este segundo grupo, ya que ha implementado unos algoritmos de aproximación para cuencas visuales que mejoran enormemente el tiempo de proceso de los antiguos algoritmos de SEXTANTE gracias a una optimización que disminuye sensiblemente el volumen de calculos necesarios a realizar. Hay dos algoritmos: el primero de ellos emplea un 3% de tiempo de proceso del algoritmo original de SEXTANTE con un 98% de precisión, mientras que el segundo emplea sobre el 0.4% del tiempo y tiene una precision media del 95% (datos aportados por el autor, todavía no comprobados por mí de forma rigurosa...)

Para quien quiera saber más, el artículo en el que se describen estos nuevos algoritmos está en este enlace.:

Approximating the visible region of a point on a terrain' by B. Ben-Moshe, P. Carmi, and M.J. Katz (http://cg.scs.carleton.ca/~paz/papers/radar5-1-04.pdf)

Y por supuesto, se puede mirar el código en el SVN de SEXTANTE, que contiene abundantes comentarios.

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