Abstract: The construction of "one base map" is the premise of natural resources investigation and monitoring. Based on the third national land survey, survey data of forest resources planning and design, this paper studies the construction process of "one base map":after the joint intersection of the two sets of data, the fusion data considering both graphics and attributes is obtained; Different fusion methods are adopted for small patches with an area of less than 100 square meters and between 100~400 square meters; Finally, the long and thin spots and the remaining small spots are checked and processed manually. Experiments show that the fusion method in this paper can eliminate small patches and form base map data based on land survey data and taking into account the special attributes of class II survey, so as to lay a foundation for the follow-up investigation and monitoring of natural resources. Experiments show that the fusion method in this paper can eliminate small patches and form base map data based on land survey data and taking into account the special attributes of forest resources, so as to lay a foundation for the follow-up investigation and monitoring of natural resources.

Key words: natural resource inventory and monitoring, the third land survey, forest resources planning and design survey, data fusion, special investigation