In recent decades, research on survey for urban planning has become an important issue. Monitoring the nature condition
of urban is an important precondition for urban planning. This paper integrates Geographical Information System (GIS)
and remote sensing (RS) to study land use/cover change and urbanization trends in Hangzhou urban area from 1976 to
2005. The study explores the temporal and spatial characteristics of urban expansion and land use/cover change from
1976 to 2005. The remotely detected land use/cover change shows that the land use/cover was largely changed.
How to use web services quickly and efficiently is quite important in geospatial applications. A possible solution of
sharing and integrating geospatial resources in opening web environment is to chain distributed and diversified geodata
and geoprocessing by using web services. This paper presents an approach for chaining geoprocessing by employing
Web Processing Service (WPS) and Business Process Execution Language for Web Services (BPEL4WS) under the
service-oriented architecture (SOA) and Open Geospatial Consortium (OGC) standard. Workflow control model and
SQL Server based register center are used in a prototype system for chaining geoprocessing web services which have
been performed functionality decomposition and packed by using extended WPS.
Spatial service chain composed by multiple spatial services, which distributed on the internet, can realize specific,
complicated spatial information processing task. This chain may be involved in bad stability, low usability and low
efficiency because of service stateless and variability of service operation environment. In this paper, we abstract the
spatial information service to form the Spatial Service Agent (SSA), and attach the spatial information data and
processing service to become operation capability of SSA. After introduce contract and policy which are used to restrict
and instruct the behavior of the SSA, multi-SSA based spatial information services flow expressed by half-ordered
contract set which formed by SSA's negotiation. Through assign specific contract operation rule to each contract and
indicate the prerequisite of cooperation, time consuming, and accomplishment state and so on, we can accurately get the
service execution state of each step for spatial information services flow monitoring and exception handling.