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1 .
t the other features are quite similor with the sweeption of a more
kWa clim&te. The indicaeow aetr%t$ueeu e~ut
- High intrusive rocks
- Idediu lw Precambric geology
The soils are Aumic cambisols.
The land uae is rough grazing.
The natural vegetation is Atlantic mediterranean with Quercus pyrenaica.
This Land Class has quite a low population density.
4 HODIFIED 1TE.W CLASSIFICATIONS
Several points for investigation arose during the ecological
interpretation of the standard ITE Lutd Classification. Some Laad
Clumem were very heterogeneous (e.g. Nw. 3 and 10) and others did
not ahow large di#continuities from adjacent Land Cluaem (e.g. Nos. 8
and 6). I therefore proceeded to test the stability of the result. of
the firmt ISA.
There were two possible ways in which to do thfs:
1 To check if too many attributcu had boa& uad, cauing apuioao"
"noise" in the results.
2 TO chsck if the attrlbut~-twd.pr6vid&zthmhem&~-t~ rpllt
the original v.riables,
Conmequently, both lines-rars- followed. IP the fM"case. only the
moat important attributes were melected. The criterion followed ram
to choose the indicator attributes which appear in the hieraschid key.
Accordingly, the amount of inforution wed in t h i m new land cluaiiicatiom.
waa lea# than that usedinthe original cluuiiic~tlon, but was the most
important available.
a. The first ru curied out using only the climatic and locatioll..l..
data (24). Thim cluaittoa~om f. sMwwwC1 %n LnigwmO.
b. In the mecond clasmification 88 select&. attrfbate~. weme amp-.
Thim 18 mhom u C2 in Figure 6.
It is v.r~r- difffhllt-to interpret? th-2 clurlftcr+fmm la m -1m
e t tLLW together, they are of value in f o l l OVOlutfoP ~ in
the remlts of the I86 when the quantiw of informstton is increud.
It a-, that, that rdmDfng tiw -of %-battom
very difficult.
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The 18A ir an objec+fs.smethod of classi%ficat&cmbut there.is a stage,.
in the ptoMdrrrr that. ir sub j d v w i .e. the ahdo.. of the cut-off pofntti-