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AN APPLICATION OF COLOUR INFRARED PHOTOGRAPH CLUSTER
SAMPLING METHOD TO LAND RESOURCES INVESTIGATION
Qiao Yu Liang
Wang Jian Yu
Shanxi Agricultural Remote Sensing Application Institute
Remote Sensing Application Division
No. 45, 4th Taoyuan, Xinjian Road
Taiyuan, Shanxi Province, China
ISPRS Commission VII / Working Group 3
ABSTRACT
The article introduces an experimental application of the colour infrared aerial photographs cluster sampling
method to land resources investigation in the area of Loess Plateau. The experiment was conducted in 5
counties - Lishi, Fangshan, Liulin, Jiaokou and Shilou counties - in Luliang Prefecture, Shanxi Province, with a
total area of about 7,000 km2. The experimental areas are dominated by seriously dissected ridges and mounds,
the ground surface is very broken with criss-crossing gullies and the land use rather complicated. The
experiment was a kind of large scale of cluster sampling, classifying aerial photograph by clusters and arranging
sampling points round photograph center instead of the overall equaling distance arrangement of the sampling
points. The concrete methos was to use fixed transparent template to arrange 9 points around photograoph
center with a distance of 2 cm between points. The sampling point interpretation of land type was based on
features of the colour infrared aerial photograph images and was done under a stereoscopic magnifying glass.
The arable land was classified into the fourth level. In comparison with other, the method has the advantages of
convenience, fasting, saving, etc. It can save over 9046 of time, manpower and funds and should be extensively
applied.
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