Scalable and Mashable Location-Oriented Web Services

Abstract

Abstract. Web-based access to services increasingly moves to locationoriented scenarios, with either the client being mobile and requesting relevant information for the current location, or with a mobile or stationary client accessing a service which provides access to location-based information. The Web currently has no specific support for this kind of service pattern, and many scenarios use proprietary solutions which result in vertical designs with little possibility to share and mix information across various services. This paper describes an architecture for providing access to location-oriented services which is based on the principles of Representational State Transfer (REST) and uses a tiling scheme to allow clients to uniformly access location-oriented services. Based on these Tiled Feeds, lightweight access to location-oriented services can be implemented in a uniform and scalable way, and by using feeds, established patterns of information aggregation, filtering, and republishing can be easily applied.

Personalized location-based services

“…Our implementation of a Tiled Feeds server [9] is based on a few extensions of the Atom feed format (most importantly, adding link relations for linking Tiled Feeds, and adding query parameter descriptions to make the query capabilities of those feeds discoverable), and a convention on what to make available as content (KML containing the spatial representation of objects within the bounding box of the feed tile in question). Interaction with such a LBS essentially uses the same interaction pattern as using the map tiles from Google Maps when using the map viewer: moving the map means that neighboring feeds have to be accessed for the associated tiles, and zooming in or out means that the more or less detailed feed tiles have to be accessed.…”

“…To initialize a map view which may contain several tiles, the Tiled Feeds server also provides convenience services (via a discoverable, self-describing protocol document) for finding the tiles necessary to populate a desired viewport or bounding box, at a given level of granularity. Since this model of interlinking feeds closely replicates the pattern of tiled map services (merely expanding the model from mere map imagery to arbitrary data contained within Atom feeds), we refer to the system as Tiled Feeds [9].…”

Implementation of Tile Searching and Indexing Management Algorithms for Mobile GIS Performance Enhancement

“…In [5], map images are stored in the form of a simple To improve the directory organization mechanism of [5], a tile feed architecture using tile keys was proposed in [6]. The proposed method processes data through direct access of directories in tile keys.…”

“…Instead of AJAX used in [5], we improve the tile key access method of [6]. AJAX was not considered because greater security is needed to protect information on business processes contained in GIS, in addition to map information.…”

Open and decentralized access across location-based services

“…The LBS architecture is based on two technologies, Tiled Feeds [2], and Feed Subscription Management (FSM). Tiled feeds is a RESTful architecture for the representation of and interaction with location-based services.…”