Gradation of agricultural land based on GIS and the fuzzy-material analysis method

The gradation of agricultural land is carried out in the Houhu farm land of Jianghan Plain based on Arc/Info GIS and the fuzzy-material analysis method. It is necessary to share agricultural land information over the world and promote reasonable utilization and scientific management of agricultural land resources. First, the factors affecting agricultural land quality are decided by AHP methods. The gradation is obtained using Arc/Info and the evaluation unit are decided through buffer area analysis of traffic and penstock and multi-layers overlapping. According to subject function of evaluation factors, the weights of assessment factors and the correlation degree of evaluation units are calculated by applying the fuzzy-material analysis method. Finally, agricultural land levels are divided according to frequency distribution of synthetic index values of assessment units. With Arc/Info, the map and dataset of grading result in the Houhu farm land are obtained automatically. Grading results indicate that the quality in this area is in medium and high side, the percentages of area in level 1,2,3,4 auount for 9.67%, 43.15%, 33.53% and 14.19% respectively. It is in accord with the local situation. So, by using GIS and the fuzzy-material analysis method, it is reliable and easy to obtain evaluation units and datasets, and the accuracy and reliability of agricultural land evaluation results can be improved largely too.