Just found out a little about this in ArcGIS (ArcMap), version 9.1.
Yes, apparently with large datasets, the "natural breaks" classification
(and maybe others like quantile) does sample. However, it is possible
to change the sample size by clicking the "Sampling" button in the
Classification windo
On Fri, 16 Mar 2007, Hervé Polesi wrote:
> Hi!
>
> Working on a litle datebase (903 lines) I notice a difference between
> the result of classInterval(style="fisher") and the natural breaks
> proposed by ArcView GIS (3.2).
> I read that ArcView works on a sample of data. Is it right ? May it
>
Hi!
Working on a litle datebase (903 lines) I notice a difference between
the result of classInterval(style="fisher") and the natural breaks
proposed by ArcView GIS (3.2).
I read that ArcView works on a sample of data. Is it right ? May it
cause a significative difference ?
Greetings from Stra
