Relief for Models of Natural Phenomena - Landscape Modelling: Geographical Space, Transformation and Future Scenarios - page 178

Table 14.1 Districts of geomorphologic segmentation of relief according to type of relief and area
(source: the authors)

Testing regions Other

Ceský masiv-
Czech massif

Ceský masiv-
Czech massif

RAS
[m]

Karpaty-
Carpathians

Karpaty-
Carpathians

Relief type

Depression
- furrow

Blanická
brázda

Pozlovická
brázda

Borkovická
pánev

Cervenecká
rovina

Plain 0-30 Sadská rovina Žerotínská

rovina

Flat hilly
land

30-75 Nechanická

tabule

Orlovská
plošina

Ostromerská
tabule

Hilly land 75-150 Podještedská

pahorkatina

Vlcnovská
pahorkatina

Radomyšlská
pahorkatina,
Milínská
pahorkatina

Prakšická
pahorkatina

Flat
highland

150-220 Studenská

vrchovina

Divácká
vrchovina

Uhrická
vrchovina

Highland 225-300 Bozkovská

vrchovina

Hošt'álkovská
vrchovina

Kozlovská
vrchovina,
Rožmberská
vrchovina

Flat
mountains

300-450 Ústecké

stredohorí

Rusavská
hornatina

Mountains 450-600 Hornoopavská

hornatina,
Cernohorská
rozsocha

- Boubínský

hrbet,
Vcelenská
hornatina

RAS: relative altitudinal segmentation.

the Czech Republic both from the area of Ceský masív and Karpaty. The reason for
selecting data from both areas is their different geological evolution and the land's
character.
Primary testing was performed on 16 testing regions. Table 14.2 shows that the
spline with tension method, which creates surfaces of various degree of smoothness
according to the set weight value, is suitable for all types of relief.
The essence of this method makes it suitable for the interpolation of relief using
altimetric data (ESRI ArcGIS 9.2 desktop help). This supposition was confirmed
during the testing of use of this and other methods for calculating various relief
types. The values of the parameter number of input points are most commonly
20-30 points for all relief types, higher values of this parameter led to erroneous
interpolation due to the fact that very remote points were also included. For less
segmented relief types a lower number of input points is more suitable because with
values around 30 it can happen that more remote points are included due to their
low density. For the parameter of weight the spread of values is from 1 to 10 for all
relief types. Therefore, for relief modelling it is suitable to use lower values of the
parameter weight of the spline with tension method.