A time series of Landsat Thematic Mapper (TM) satellite images are used to examine changes of cultivated land in
Xinxiang City, Henan Province of China. After data processing and interpreting, information of cultivated land is
extracted in the late 1980s, 1995, 2000 and 2005. Then, the paper mainly focuses on the spatio-temporal change study of
cultivated land in Xinxiang City. Time series model, cultivated land changed degree model and fragmentation index are
used to analyze the change of cultivated land and its subclasses in quantity. The results show that with time varying,
cultivated land area as well as area of its subclasses, dynamic degree and fragmentation extent has been changing all the
time and the size of change area is not the same at different periods. And both decreasing and increasing exit. Next, GIS
spatial analysis and barycenter transfer model are used to analyze the spatial change of cultivated land. The outcomes of
transfer matrixes reflect that the change course of cultivated land had two aspects including roll-in and roll-out, and
although there are many interchanges between cultivated land and forest, grassland, water region and unused land, the
urbanization and economic development are main reasons for the loss of cultivated land. Through calculating the
barycenter, the results show that on the whole, the cultivated land barycenter in Xinxiang has a trend of moving
southeast, reflecting that cultivated land in southeast part had a smaller reduction than northwest part.
KEYWORDS: Global Positioning System, Forestry, Geographic information systems, Remote sensing, Personal digital assistants, Databases, Data storage, Control systems, Web services, Geography
Forest plays an important part in the sustainable development. Digital forest implementation will be helpful in cognizing
and managing the forest. The paper discusses the programming theory of digital forest construction, and constructs the
basic framework of digital forest using a series of modern information technologies, including integration of GPS, GIS
and RS, software development and computer network. Taking monitoring of forestry biological pest as a thematic
application case and adopting a series of successfully developed systems, this paper validates that it is feasible to
implement digital forest with this method.
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