= 1468 =
Ein weiteres Problem ist die Kartierung der Feldergrenzen. Hier
müssen Fehlklassierungen vorkommen, weil die Teilmatrizen im Grenz-
bereich Werte beider benachbarten Kulturen aufweisen. Der Vergleich
der Feldkarte (Abb. 2) mit der automatisch erstellten Landnutzungs-
karte (Abb. 3) zeigt wie die Resultate für den vorliegenden Fall zu
werten sind. Hàufig sind die Teilmatrizen an den Feldergrenzen gar
nicht klassiert worden.
Abstract
The automatic interpretation of large scale colour aerial photographs
allows a rapid identification of crop types and a maplike presentation
in form of a computer-print. The acreage of each crop type can easily
be computed. Ground control will be reduced to some homogenous sample areas.
Infrared colour aerial photographs (1:8,500, 6.6.64, Stammheim ZH) were
scanned and digitized with the Optronics-photomation-system in three
. colour screens (red, green, blue). Most important is the appropriate se-
lection of the diaphragm. Good crop classification results could be ob-
tained by scanning the photographs with a diaphragm of 25 p, whilst the
use of a 100 p diaphragm was not successful.
For the classification the digitized photo was segmented into little ma-
trices. Then the mean and the standard deviation of each matrix was cal-
culated for the red, green and blue values. Using these six variables for
the classification of the crop types satisfactory results could be achieved.
JV Literatur
FASLER F., 1978, IBIS, Ein interaktives Bildinterpretationssystem,
Int'l Symp. on Remote Sensing, Freiburg i.Br. BRD
LINTZ J. and SIMONET D.S., 1976, Remote Sensing for Environment,
Addison-Wesley Publishing Company
MAURER H., 1974, Quantification of Textures - Textural parameters
and their significance for classifying agricultural
crop types from colour aerial photographs, Photo-
grammetria 30, p.21-40
SEIDEL K., 1976, Digitale Bildverarbeitung, Technischer Bericht des
Photographischen Inst. der ETH Zürich
TOMLINSON F., 1972, Geographical Data Handling, Symp. Edition Int'l.
Geographical Union Commission, Ottawa, Canada
Abt
