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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。
Pearl River Estuary along the coast of economic development, more people less land, food long-term shortage, and the salt acid field with the Pearl River Delta to the sea showing a continuously changing characteristics of the changes in acid and acid changes in the number and spatial distribution of the Pearl River Estuary is the land use Planning, crop potential evaluation of the important basis. The quality problems of the type map of the salt acid field in the Pearl River Estuary are pointed out. Under the control of the DEM (Pearl River Delta) topographic map, the soil type map of the Pearl River Estuary is digitally constructed. The factors influencing the hue characteristics of remote sensing images in the acid-salicylic acid field are analyzed. The latest remote sensing images are used to re-map the boundary of the acid-acid fields, and a more realistic map of the acidified fields in the estuary of the Pearl River is obtained. Its area. The method and the effect of updating the distribution map of the salt acid field in the Pearl River Estuary by using remote sensing method and establishing its spatial database are described.