[Numpy-discussion] Crosstabulation

Robert Kern robert.kern@gmail....
Sat Jul 17 14:34:34 CDT 2010


On Sat, Jul 17, 2010 at 13:11, Friedrich Romstedt
<friedrichromstedt@gmail.com> wrote:
> 2010/7/14 Ionut Sandric <sandricionut@yahoo.com>:
>> By raster data I mean classified slope gradient (derived from a dem), landuse-landcover, lithology etc. A crosstabulation analysis will give me a table with the common areas for each class from each raster and this will go into other analysis. I can do it with other softwares (like ArcGIS DEsktop etc), but I would like to have all with numpy or to build something on top of numpy
>
> I'm afraid also Zach does not understand what you are talking about
> ... So my first question (please bear with me) would be: What's a dem?

Digital Elevation Map.

>  (n/a in my dictionary)  And sorry for the cross-talk on the other
> first post by you ...
>
> And by slope gradient you mean second derivative?

No, the first derivative. "Slope gradient" is a reasonably common,
albeit somewhat redundant, idiom meaning the gradient of an elevation
map.

-- 
Robert Kern

"I have come to believe that the whole world is an enigma, a harmless
enigma that is made terrible by our own mad attempt to interpret it as
though it had an underlying truth."
  -- Umberto Eco


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