Rules-Driven of Dynamic Resources Directory for Land Resources Datacenter

The spatial resources include data resources, function resources and authority resources. In order to realize effective integration and management of the spatial resources under the distributed heterogeneous environment, the land resources data center has provided the rules-driven of dynamic directory. The composition operators were constructed by relation algebra operations such as selection, projection and join which were compounded effecting on data (function) units; these formally described and quantitatively optimized the expressions of dynamic directory in terms of mathematics. Based on analyzing access control operation hierarchy, authority-function binding model was abstracted by authority operator to simplify the complexity of authority scheduling and to solve the geographic entities granularity based authority control and cross-region different authorization in land business. Finally, resources directory can provide the configurable and extensible on-demand service and achieve the isomorphism of heterogeneous spatial resources in the scheduling management level.