[GRASS-user] Natural breaks classification

[Salvatore Mellino]

Thanks,

I'm trying but I receive an error. 

1. In R I started the libraries spgarass6 and classInt 
2. I imported the DTM in R using           DTM <- readRAST6("DTM a mapset", ignore.stderr=TRUE)
3. I used the command                DTM_class <- classIntervals(DTM, n=5, style="fisher")             and I received the error

Error in classIntervals(DTM, n = 5, style = "fisher") : 
  var is not numeric


Any suggestion?

Salvatore


Il giorno 16/mag/2012, alle ore 17:58, Luigi Ponti ha scritto:

> Hi Salvatore,
> 
> On 16/05/2012 17:38, Salvatore Mellino wrote:
>> Hi,
>> 
>> I have a DTM raster map and I want to classify it in 5 classes by means of natural break method (http://en.wikipedia.org/wiki/Jenks_natural_breaks_optimization). Is it possible with GRASS.
> 
> I usually do that via the R package classInt
> http://cran.r-project.org/web/packages/classInt/index.html
> 
> which requires using the GRASS-R interface. For a general overview of the integration, see
> http://grass.osgeo.org/wiki/R_statistics
> 
> Kind regards,
> 
> Luigi