2.6 Digitization of administrative boundaries:
Enumeration Districts
The digitization of the 1990 year's population census districts of
Budapest was carried out by the State Administration
Computing Service. The scanned files were then vectorized by
MicroStation raster editing software. The files were prepared in
DGM format, the data taken over and presently used by HCSO
are of DXF format.
2.7 Delimitation of Urban Morphological Zones
(UMZ)
The urban morphological zone (standardised definition adopted
by European statisticians) will be an aggregate of units of land
cover/land use based on a core of residential units (category A1 of
the statistical nomenclature) and consisting largely of "man-
made" elements (categories Al to AS of the statistical
nomenclature).
The Urban Morphological Zone is built from the land cover/land
use map through an aggregative procedure according to rules
which have been fixed by statisticians. The criterion of Continuity
of Built-up Area is the principle which is utilised for aggregating
land cover/land use units potentially to be integrated within the
Urban Morphological Zone. The procedure to be applied is as
follows: any man-made area (categories Al to A5) less than 200
metres distant from a unit already included in an urban
morphological zone will be incorporated in this zone. The
aggregation procedure is iterative, starting at the centre (from the
initial population nucleus) and moving towards the outskirts,
stopping when all aggregations have been completed.
2.8. Identification of Urban Agglomeration (UA)
The urban morphological zone is characterised by physical
boundaries in space. In order to meet the large number of
statistical requirements and make this type of information
spatially comparable with other types of statistical data normally
referenced to administrative units, the urban morphological zone
has to be transformed in terms of local administrative units. The
object of combining these two types of data is to create the best
possible match between the physical boundaries of urban
morphological zones and administrative boundaries according to
specific criteria and rules. These criteria can be physical (land
use), functional (population criterion, economic function) or legal.
Three methods can be applied: two of them based on physical
criteria (the method adopted at European level based on the urban
morphological zone, another pilot method based on a simulation
of population criterion), one based on population data.
We used the AGG2 Approached method (physical criterion)
procedure for identifying urban agglomeration.
The approached method consists in using a criterion which
simulates as far as possible a population criterion: information
regarding residential areas are considered as a useful criterion for
approaching population criteria (high correlation hypothesis
between the repartition of residential areas and the repartition of
population). The definition to be applied is as follows: any
administrative unit comprising a continuous and contiguous area
to the urban agglomeration which was identified at an earlier
stage as a component of the urban morphological zone is
allocated to the corresponding urban agglomeration if at least
50% of the residential areas of the administrative unit are included
within this area.
3. RESULTS AND DISCUSSIONS
3.1 Delimitation of urban agglomeration
In the framework of our pilot project we used physical criteria
(continuity of built-up areas) in determining UMZ and UA.
These results were then compared with the administrative
agglomeration delimited according to functional characteristics.
In both approaches we strived to apply the principles and
definitions laid down in relevant Eurostat documents.
From the completed interpretation we cut out those polygons
which are components of UMZ. Connection of polygons within
200 metres was created by ARC/INFO command "buffer" with
buffer-distance 100 metres. The central polygon was cut out, and
finally cleaning with ARC/INFO command “dissolve”.
According to the results of the project the UMZ consists of 35
localities within the administrative agglomeration. The
agglomeration process is function of natural and physical
characteristics, social needs and economic possibilities. One of the
physical determinants is the linear infrastructure which, however,
does not coincide with the belonging to the UMZ. E.g., on the
right (Buda) side of the Danube, the locality of Budakeszi <641...,
241...»! having 4 different connections, does not belong to the
delineated UMZ.
Another characteristic is that the strip located between the right
side of the Danube and the Pilis mountains constitutes the main
recreational and suburban area near the capital (Szentendre <
651.., 258 ..» is the residence of an important part of artists,
while Leányfalu «653., 264» . and Tahi «652.., 267.> are
recreation - and ever more often also residential - areas for
affluent people.) At the same time an important fraction of these
localities do not form part of the UMZ, as the "rupture" in the
categories making up the UMZ exceeds the limit of 200m.
As against this, most of the relevant localities of the left side of
the Danube belong to the UMZ, although this area can rather be
considered as independent owing to its industrial plants (e.g. Vác
<635.., 271..>). Yet its traffic connections are also good, and this
connection has become even closer by the recent opening of the
new main road.
From among the 35 localities concerned with the UMZ,
according to the AGG2 approached method there are 23 which
make part of the urban agglomeration (UA) with their full
administrative area. In these localities the share of the area of
the category Al - after being made up - has reached or
exceeded 50% of the total area of categories A1-AS constituting
the UMZ.
In further three localities concerned with the UMZ - Budaórs,
Tárnok and Pomáz - the share of inhabited areas within built-in
areas exceeds 45%, but still remains under 50%.
According to the results, the urban agglomeration makes an
important extension of the UMZ, as the full administrative area
of the localities concerned is constitutive part of it. As far as the
number of localities is concerned, nearly one third of the 79
localities of the administrative agglomeration make
simultaneously part of the urban agglomeration, too, and the
area covered is about two fifth of that of the official
agglomeration. (see Colour Plate 2)
1 < numbers» are in the Hungarian Unified Projection (EOV) co-ordinate system.
80 International Archives of Photogrammetry and Remote Sensing. Vol. XXXII, Part 7, Budapest, 1998
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