In distributed Geographic Information Systems such as web maps, it is common to split large images into raster image tiles. Traditionally, clients request auxiliary data for an image region (such as a pixel position on which the user has clicked, tapped or hovered) by issuing a separate network request for additional information. However, such network round-trips slow down the user experience, particularly on slow or unreliable connections such as mobile networks. What is disclosed is a system and method for encoding auxiliary data into raster images so that remote clients can retrieve small amounts of encoded data without issuing separate network requests.
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Brawer, Sascha, "Encoding Auxiliary Data into Raster Images", Technical Disclosure Commons, (May 01, 2019)