engleski

Overview of Web Map Services

Geospatial data can take many forms, ranging from printed sheets to digital imagery or vector data. In the early days of computers these were scanned maps and later digital maps or imagery stored on a local hard drive, followed by network drives. As the amount and complexity of the data grew, it became impractical to store this data locally and the need arose to find a standardized way to transfer this data over the network. Base maps are often enriched with additional content, requiring the merging of multiple layers. To provide a standardized way to transmit and process geospatial data over the network, the Open Geospatial Consortium (OGC) organization has developed several international standards. All of these standards are somewhat similar names, but are developed with different purpose in mind. Some standards are intended for the transmission of raw raster geospatial data, others for use on devices with limited processing capability, meaning that all rendering must be done on the server side, some serve as base maps, while others are for dynamic content. To clarify difference between the international standards and their intended use cases, in this work we examine the following OGC standards: Web Map Service (WMS) for displaying custom maps, Web Map Tiled Service (WMTS) for distribution of pre-rendered static map tiles, Web Feature Service (WFS) for two-way transfer of vector data, Web Coverage Service (WCS) for transfer of raw imagery formats, and Web Processing Service (WPS) for tasking a server with geoprocessing tasks. We clarify the intent of each service and explain the principles of operation at a technical level, which may not be visible to the end user. This paper provides guidance for organizations which have necessity for transferring geospatial data over a network on which technology is best suited for their use case.

Open Geospatial Consortium (OGC) ; Web Maps Service (WMS) ; Web Map Tiled Service (WMTS) ; Web Feature Service (WFS) ; Web Coverage Service (WCS) ; Web Processing Service (WPS)

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