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| PubMed | |
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Article by Wang, B. 1 |
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Article by Jiang, Q. G. 1 |
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Article by Meng, X. C. 1 |
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Article by Wu, Y. C. 2 |
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Article by Yang, J. J. 1 |
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Article by Li, G. J. 3 |
��������ң��Ӱ������( MSS��ETM��CBERS) �Գ��н���������������˵��飬�о�30 ������������ʡ���е���չ��������ҽ��NDVI ���ݣ����о�����Χ�ڵ�ֲ����������������о����������: 1976—2000 �ꡢ2000—2007 �������Σ����н�����������������ӣ������չ���� 5. 10%������6. 32%����չǿ�ȱȽ�������������Ҫ�ֲ��ڹ���ͨ���ô���; �о�����Χ�ڶ�����ֲ������������Ժ���������NDVI ��ֵ������о�������Ӷ���ߡ�
Based on the remote sensing images ( MSS��ETM��CBERS) for three periods��the authors investigate the urban buildi-up area��and study the expansion in three provinces of Northeast China in the past 30 years and vegetation coverage��combining with the NDVI data�� The results showed that the urban build-up area continue to increase in 1976-2000 and 2000-2007��the annual mean expansion rate increased from 5. 10% to 6. 32%��the notable area of expanding strength mainly distributed in Harbin-Dalian traffic economic belt; the vegetation coverage in the east was better than the west within the scope of the study areas��and NDVI mean raised with the increase of urban distance��