Evolution of Yellow River Estuary from 1975 to 1986 analyzed by Remote Sensing techniques
Yuan Zhi-ping
Reconnaissance Planning & Design Institute
YRCC, MWREP China
Abstract
In order to investigate and calculate the evolution of coastline at the Y, R, estuary more than 30 Landsat images in the different time are analyzed and researched by 9 methods. This result will provide the scientific basis for the planning and development of the estuary delta.
Introduction
After the Y.R. changed it's original river course into the Bohai Sea in 1855, the swing of river channel and the flood overflow have serious influence on the development of local economy. The evolution of the Y.R. estuary is analyzed by the Remote Sensing technique to obtain the scientific basis for the harnessing and development of the Y.R. estuary and put an end to the backwardness of this region. This is the important point of the research.
Selection of Landsat images and accuracy processing
Thirty Landsat images selected from 1975 to 1986 are interpreted for the need of the research subject. The optical and computer processing of Landsat image are respectively conducted to acquire the demand information for meeting the need of the various charts. The accuracy of Landsat image depends on the varied factors. The accuracy of Landsat image, which is interpreted by the apparent ground objective method, is poor due to the theoretical and calculative error of ground objective. But the Landsat images are interpreted by the way, which make the geodetic triangulation point coincide with the apparent ground objective to obtain more satisfactory effectiveness.
