【摘要】 珠江口沿岸经济发达，人多地少，粮食长期不足，而咸酸田随珠江三角洲向海扩张呈现出不断变化的特点，因此研究咸酸田变化的数量和空间分布特点是珠江口沿岸土地利用规划、作物潜力评价的重要依据。指出了目前珠江口沿岸咸酸田类型图所存在的质量问题，在珠江三角洲基础地形图（ＤＥＭ）的控制下，对珠江口土壤类型图进行了数字化建库处理。分析了影响咸酸田遥感影像色调特征的因素，利用最新的遥感图像对咸酸田的图斑边界重新进行了勾绘，获得了比较符合实际的珠江口咸酸田分布图并借助ＧＩＳ统计了其面积。说明了利用遥感方法更新珠江口咸酸田分布图、建立其空间数据库的方法和效果。更多还原

【Abstract】 Yunnan is a special province whose water resources is very abundant but with widely water shortage.That is, the effective water resources is in a poor condition.The main challenges facing the province are the development of social-economy and increased water demand,the water pollution,the deterioration of eco-environment,and the decreasing effective water resources.The pollicy for macroscopic management and strategy in choice of effective engineering measures are suggested in this paper.更多还原