Semantic Web-based Intelligent Geospatial Web Services

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Therefore, based on actual successful experiences that have led to the development of community-based portals, possible strategies for the development of the next generation of geoportals are shown [19]. This plan is divided in two different phases: i capturing and processing the necessary images from aircraft and satellite and ii data extraction and dissemination. In the region of Castilla-La Mancha the agents that take part through agreements of collaboration between civil services, are the following: the Board of Communities of Castilla-La Mancha Statistical Institute of Castilla-La Mancha responsible for management at regional level, mainly administrative tasks; the National Geographic project manager at the national level; and the Regional Development Institute at the University of Castilla-La Mancha, which carries out technical management and regional quality control.

The company that carries out the photogrammetric project is Tragsatec via commissioned management with the regional administration, so the National Geographical Institute IGN staff will be in charge of developing the national-autonomic control. To date, only one aerial photogrammetric flight covering the entire region has been performed.

Goals First, this project analyzes the importance of exploiting thematic radiometric information using false-color infrared images.

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One of the main challenges of photogrammetry is the automatic extraction of physical measurements by means of reflectance and radiance images. In this way, and similarly to remote sensing images, several approaches and analyses such as the extraction of biophysical parameters, forest coverage evolution and vegetative analysis of species, can be extrapolated.

For this purpose, an exhaustive analysis is made of the physical elements present in the area of study in the acquisition phase, of which atmosphere, solar illumination, observation geometry and terrain information are mandatory. Second is monitoring the status of the project. It is essential to know the actual project status together with its evolution. Questions such as what area of the territory has been expanded , how has the vegetal or forest surface evolved, or how many sheets of the digital elevation model or orthophoto have been made are essential.

In this line of work, time is a vital factor because the information varies very quickly. Thus, to have valid monitoring, the information must be constantly updated rapidly and should indicate the date of update.

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Project monitoring involves reporting the rates of production of the company and the dynamics of quality control. In particular, these projects are made up of several steps of production and quality control which are performed in a sequential fashion and require a considerable workload. That is, the next step cannot be performed until the corresponding quality control step has been validated. For instance, the digital terrain model cannot be generated until the aerotriangulation has not been validated. Therefore, a delay in the quality control step directly affects the production step and vice versa.

Because the project is in constant motion, an essential condition of the designed system is to allow rapid updating of information with minimal effort with an easy way to incorporate new content. Third is the development and implementation of a data model that allows the management of the project in an optimal way and which is scalable according to the needs of the project.

Last but not least, is the publishing of the results: from the main derived metric and thematic cartographic products to those reports related to the quality control protocols undertaken by the regional technical team. Special emphasis is placed on exploiting the four multispectral bands provided by the DMC digital camera, to obtain thematic information that can be contrasted based on its spatial and temporal resolution. To this end, a radiometric calibration of the camera [22] is performed with the aim of passing from digital levels to real physical magnitudes.

This paper presents a solution for the sustainable thematic management of thematic information and quality control of orthophoto production using a web-based SDI. After this introduction, Section 2 outlines the SDI architecture developed together with its conceptual model; Section 3 describes the project monitoring in each of the phases of production; Section 4 presents the quality control performed to meet the technical specifications of the project; and Section 5 describes the exploitation of thematic information based on reflectance and radiance images.

International Conference on Intelligent Systems and Knowledge Engineering 2007

A final section is devoted to the concluding remarks and future perspectives. System components The system is based on the conventional model of three layers. The primary level is the data that can be arranged in different formats.

Geospatial Standards for Data Science - Dr Gobe Hobona, OGC

At the intermediate level are the application servers and interfaces that allow the third level, comprising the final user, to access the data in a controlled manner. The following scheme Fig. In the designed model, the basis is a database with a spatial component that integrates purely geographical and alphanumeric information that remains interrelated at all times.

Geospatial Semantic Web Interoperability Experiment

Basic information comes mainly from the following sources:. Another essential component is a web server application that enables communication through http protocol. A mapping server called Mapserver is installed on this application to manage and visualize geographic information.

These two elements are essential, as they allow access to the information base through various types of requests. Finally, it is essential to discuss the role of the user as a part of the system component.

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Depending on the method of accessing the published information, different types of customers can be established:. Conceptual model Among the most important conditions for the implemented infrastructure is that the conceptual model must be agile with information management, updating and adding new elements [23,24].

To this end, the following structure is defined:. In this project, the following states of the model are of vital importance:. Semantics-enabled metadata tracking and satisfaction allows analysts to focus on the generation of a geospatial process model rather than spending large amounts of time in data preparation.

Process planning facilitates the construction of complex services and models for geocomputation. A three-phase procedure to cover the lifecycle of service chaining and to identify the roles of the methods involved is proposed. It includes process modeling, process model instantiation, and workflow execution. The approach is implemented in a prototype system with use cases to demonstrate applicability. The objective of the research is to develop the key technologies for an intelligent geospatial knowledge system based on Web services to automate the data discovery and data preprocessing steps in the distributed Web service environment, to automate a range of knowledge discovery processes in a limited geospatial domain, using the automated construction and execution of service chains, and to facilitate the construction of complex services and models for geocomputation.

By introducing Semantic Web technologies into geospatial Web services, this book addresses the semantic description of geospatial data and standards-based Web services, discovery of geospatial data and services, and generation of composite services. Grand Eagle Retail is the ideal place for all your shopping needs! With fast shipping, low prices, friendly service and over 1,, in stock items - you're bound to find what you want, at a price you'll love!

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