Research of soil quality based on 3S in the Yellow River delta

The aggravation of soil salinization and quality degradation are the main problems in land exploitation and utilization in the Yellow River delta. Therefore, it is meaningful for reasonable use and protection of land resources to evaluate soil quality quantitatively and objectively in this region. GPS technology was used to obtain sampled point information automatically; RS was used to obtain the land use current situation data fast, and MapGIS was used to vector data. Based on ArcGIS, index distribution map and membership value distribution map were obtained by Kriging method. Soil quality distribution map was obtained by index summation method under ArcGIS. Automatic soil quality evaluation procedure based on 3S technology was constructed. Compared with 3S based and conventional evualation method, the consistency rate is above 90%, which proves soil quality evaluation based on 3S is accurate and reliable.