Building multi-scale rectangular grids based on raster zonal statistics.

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Cedric
Cedric 2013-2-21
Dear all,
I am using some algorithm of my own for building multi-scale rectangular grids with a refinement depth based on zonal statistics performed on a raster (e.g. all grid cells whose sum of pixels values is above a given threshold are refined), as illustrated below
I was wondering if any of you knew a powerful library or algorithm for doing this kind of operations in MATLAB (I am currently doing this in both MATLAB and ArcGIS/Python for comparing), because my algorithm is starting to be slow with e.g. 8000x4000 rasters.
Thank you and best regards,
Cedric

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回答（1 个）

Jan
Jan 2013-4-29
I've used a leap frog algorithm, see e.g. "Structured adaptive mesh refinement using leapfrog time integration on a staggered grid for ocean models" Ocean Modelling 9 (2005) 283–304, doi:10.1016/j.ocemod.2004.07.002 . But unfortunately this was an experimental program only, which had an advantage compared to using a fine mesh only, when the coarse mesh avoid disk swapping.
I assume you know adaptmesh already, but perhaps this tip it might be useful other readers.
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Cedric
Cedric 2013-5-3
编辑：Cedric 2013-5-3
Hi Jan, thank you for your answer and sorry for the belated reply! The issue with adaptmesh and related functions is that it is difficult to use them for generating rectangular multi-scale grids like mine, but thank you for your reference; I didn't know this article actually and I am placing it right now in the pipe of the articles that I have to read during the upcoming week!
Cheers,
Cedric

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