Geo-referencing of aerial imagery using embedded image identifiers and cross-referenced data sets
Digital watermarking technology is used in conjunction with map data, such as is acquired by satellite and other aerial sensors, and as may be generated from databases based on such aerial data. The watermarks can be used, e.g., to track meta data, provide serialization and forensic tracing, and various other benefits. The disclosure also contemplates that incoming imagery is automatically geo-referenced and combined with previously-collected data sets so as to facilitate generation of revised composite maps.
1. In a method of compiling satellite imagery and generating a map therefrom, an improvement comprising:
watermarking image data acquired by a satellite;
storing the watermarked image data in a database;
generating a map from the database; and
watermarking the map.
2. A composite map formed from plural sets of component map data, characterized in that said plural sets of component map data each are encoded with a different watermark, each of said different watermarks encoding, or linking to, meta data associated with its respective component map data.