Web Service Enabling Spatial Applications

Open Standards based for Web Services and Spatial

Some of the services that have been standardized
 – location services (routing, mapping, geocoding, directory services)
 – catalogue services (discovery, browse, and query against catalog servers)
 – map services (request/provide maps and info about the content of a map)

requirements
 – access/search/update/delete geo-spatial feature
 – access/update securely
 – manage feature privs at an instance level
 – real-time fransfer of feature instance using standards

approach
 – use SOAP for request/response
 – XML over HTTP Post method for request/response
 – Spatial for feature instance storage/retrieval
 – implement OGC filter specification for feature search
 – use WSS/LDAP for auth, row level security for instance-level priv mgmt and WSS for secure transfer of feature data
 – support publishing feature types from database data source (complex comumns, netsted table, XML types)
 – support publishing feature types from external data sources
 – implement token based locking to support WFS locking protocol to support long transaction model to artificially lock rows in the database
 – implement feature cache in middle tier to reduce spatial data xfer from DB to App server
 
WFS Operations
 – get capabilities
 – describe feature
 – transactional – getfeaturewithlock
                        – lockfeature
                        – insert, update, delete
the transaction and locking can span sessions. The only way to unlock this is through the WFS handler which is integrated into the OC4J/J2EE container. There is an expiration time that is default or specified by the client just in case the client goes away for a long time. This is done with triggers on tables/views to make sure that it is properly locked and the same client comes back with the proper token.

WFS Metadata
 – feature types, type tags, type attributes
 – complex types
 – spatial operators

there are two data sources that are supported – relational data type – PLSQL API and Java API done through XSD data types. The Java API is typically used to register feature types and feature type metadata

There two use cases – type supplier and type consumer

fully compliant with the WFS 1.0 spec

auth is done client -> oc4j using SOAP/WSS. We then use standard oc4j connections to connect to the database. This allows the use of VPD and user views on top of the database.

demo using OEM for App Server to configure the server. We define an application and deploy it using the application administration. When we define the app we also define the security service and the data sources. In this example we use a WFS connection. We also create a web service with the certificate and signature key definitions for security.

the client side is developed using JDeveloper. The feature type/app comes from an xml description of the spatial data type. We create an empty project, add a web server proxy using the WSDL file defined by the spatial service. At this point we have a non-secure connection and need to secure the connection. We go to the proxy and edit the security parameters. In this example we use a digest with no encryption (for demo purposes only) and a public keystore and private key of the client and server. At this point we have a secure proxy and just need a password for the signature key alias. To debug this exchange we run the http analyzer in JDeveloper so that we can see the request coming from the client and the answer from the server.

At this point we have some content that we wanted to publish. We define a JDeveloper client and link the security to that of the server security policies. We then ran a test to look at the connection and verify that it is working properly. At this point we can encrypt the data and turn off the html debugger.

The second demo is to use a relational connection to the data. To do this we use the map builder to load data and push our data into the spatial database. We do this by connecting to the WSL service and looking up the interfaces that we can use. We connect and look at the features, select a spatial column (GEOM) and correlate some element in the data (State Name) to the map. At this point we can create a query and return the map data with the state name placed into the state that the query finds.

OpenLS is a translation service that is done on the back end. This operates as expected according to the standard.

Catalog Services are a little more complex. The catalog request can be spatial or relational in nature. The catalog service server returns metadata associated with the item in question. To implement this it uses SOAP for request/response and XML over HTTP Post method for request/response. The difference is that ResultSet caching will be support to retrieve records from a single query across different web locations. This allows the user to scroll through related material that is close to the search object returned. The cache returned is currently not tunable and is handled by the server. Future releases will give hints to the cache service on what to populate.

web map service supports getcapabilities, getmap, and getfeatureinfo

this was an information packed presentation with lots of technical data. I recommend that you download the presentation once it is available. Unfortunately the best part of it was the demo which was a live demo of developing with JDeveloper and MapViewer.

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    Casibom’un kazanç sağlayan ödülleri ve ünlülüğü ile birlikte, siteye üyelik hangi yollarla sağlanır sorusuna da değinmek gereklidir. Casibom’a mobil cihazlarınızdan, PC’lerinizden veya tabletlerinizden web tarayıcı üzerinden kolayca ulaşılabilir. Ayrıca, web sitesinin mobil uyumlu olması da önemli bir artı getiriyor, çünkü şimdi hemen hemen herkesin bir akıllı telefonu var ve bu cihazlar üzerinden kolayca giriş sağlanabiliyor.

    Mobil cihazlarınızla bile yolda canlı iddialar alabilir ve müsabakaları canlı olarak izleyebilirsiniz. Ayrıca, Casibom’un mobil cihazlarla uyumlu olması, memleketimizde kumarhane ve casino gibi yerlerin kanuni olarak kapatılmasıyla birlikte bu tür platformlara erişimin büyük bir yolunu oluşturuyor.

    Casibom’un güvenilir bir kumarhane sitesi olması da önemli bir avantaj getiriyor. Belgeli bir platform olan Casibom, kesintisiz bir şekilde eğlence ve kar sağlama imkanı getirir.

    Casibom’a abone olmak da son derece basittir. Herhangi bir belge gereksinimi olmadan ve ücret ödemeden siteye kolaylıkla abone olabilirsiniz. Ayrıca, platform üzerinde para yatırma ve çekme işlemleri için de birçok farklı yöntem mevcuttur ve herhangi bir kesim ücreti isteseniz de alınmaz.

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    Sonuç, Casibom hem emin hem de kazanç sağlayan bir bahis sitesi olarak ilgi çekiyor. Yüksek ödülleri, kapsamlı oyun alternatifleri ve kullanıcı dostu mobil uygulaması ile Casibom, kumarhane tutkunları için ideal bir platform sunuyor.

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  770. chronometer watches
    Understanding COSC Certification and Its Importance in Watchmaking
    COSC Accreditation and its Strict Standards
    Controle Officiel Suisse des Chronometres, or the Official Swiss Chronometer Testing Agency, is the official Swiss testing agency that attests to the precision and precision of wristwatches. COSC certification is a mark of excellent craftsmanship and reliability in timekeeping. Not all watch brands pursue COSC accreditation, such as Hublot, which instead sticks to its proprietary demanding standards with movements like the UNICO, attaining equivalent accuracy.

    The Art of Exact Chronometry
    The core system of a mechanical watch involves the spring, which provides energy as it loosens. This mechanism, however, can be susceptible to external factors that may influence its accuracy. COSC-validated movements undergo strict testing—over fifteen days in various circumstances (five positions, three temperatures)—to ensure their durability and reliability. The tests measure:

    Typical daily rate precision between -4 and +6 seconds.
    Mean variation, highest variation levels, and effects of thermal changes.
    Why COSC Validation Matters
    For timepiece aficionados and connoisseurs, a COSC-accredited watch isn’t just a item of tech but a demonstration to enduring excellence and precision. It represents a timepiece that:

    Presents outstanding dependability and accuracy.
    Provides confidence of quality across the entire design of the timepiece.
    Is likely to hold its worth more effectively, making it a wise choice.
    Famous Chronometer Manufacturers
    Several famous brands prioritize COSC accreditation for their timepieces, including Rolex, Omega, Breitling, and Longines, among others. Longines, for instance, provides collections like the Record and Spirit, which highlight COSC-certified mechanisms equipped with advanced substances like silicone balance suspensions to boost resilience and efficiency.

    Historical Context and the Development of Timepieces
    The concept of the chronometer dates back to the need for exact chronometry for navigational at sea, emphasized by John Harrison’s work in the eighteenth cent. Since the formal foundation of COSC in 1973, the certification has become a standard for evaluating the precision of luxury watches, continuing a legacy of excellence in horology.

    Conclusion
    Owning a COSC-accredited watch is more than an visual choice; it’s a dedication to quality and precision. For those appreciating accuracy above all, the COSC accreditation provides peacefulness of mind, ensuring that each validated watch will perform dependably under various circumstances. Whether for personal satisfaction or as an investment, COSC-certified watches stand out in the world of watchmaking, maintaining on a legacy of meticulous timekeeping.

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