标题：THE SEMIAUTOMATED IDENTIFICATION OF THE PLANATION SURFACES ON THE BASIS OF THE DIGITAL TERRAIN MODEL. CASE STUDY: THE MEHEDINŢI MOUNTAINS (SOUTHERN CARPATHIANS) 1
摘要：The paper presents a method for the
semiautomated classification of the planation surfaces,
using the Digital Terrain Model (DTM) and the object-
oriented analysis. The effort undergone for developing
such a method has a number of motivations. The first
one is that these landforms are very important for
decoding the geomorphologic evolution of the relief
units. The second motivation concerns the fact that their
identification and mapping, by using classical means,
represents a difficult demarche, which requires a lot of
time. Finally, the already-known limits of the relief
analysis using the DTM at pixel level impose the testing
of an object-oriented analysis, in which the area under
study is divided into objects of various dimensions, as
homogenous as possible from the viewpoint of one or
more properties. The method that we propose supposes
the following steps: the realisation of the slope model
and of the flow model, starting from the DTM; the
division, by segmentation into objects that are as
homogenous as possible from the viewpoint of the
slope; the classification of the objects into landforms
(planation surfaces) by using the fuzzy functions and
taking into account more factors simultaneously (the
average slope value, the minimum slope value, the flow
coefficient and the altitude), and the selection and
grouping of the identified surfaces into sculptural
complexes. The first stages represent the automated part
of the method, while the last one requires a detailed
geomorphologic analysis of the area, as well as the
validation of the results on the field. The method was
firstly developed for the Godeanu Mountains, the map
of the levelled surfaces (Niculescu, 1965) being used for
the identification of the parameters included in the
algorithm, as well as for testing the results obtained in
the view of the improvement of the method. Due to the
good results thus obtained, the same method was also
used for mapping the levelled surfaces in the Mehedinţi
Mountains, and, along with the field observations, there
was realised the planation surfaces map for this relief
unit.
关键词：planation surfaces, Geomorphometry,
Digital Terrain Model (DTM), object-based image
analysis (OBIA), Segmentation, The Mehedinţi
Mountains (Sothern Carpathians)
