An efficient query strategy for integrated remote sensing and inventory (spatial) databases

The integration of disparate heterogeneous spatial databases for extending queries is a challenging task. The authors present a novel framework, based on a k-nearest neighbor (kNN) algorithm, for integrating remote sensing imagery with Forest Inventory Analysis (FIA) sample point/plot data managed in a relational database system. We then demonstrate how queries to this system may be extended over any arbitrary region of interest in a Web based geographical information system. To build the integrated database, spectral signatures are collected at FIA plot locations from the Landsat TM image. A plot-id image is produced by assigning each pixel to the closest FIA plot in multi-dimensional spectral space. The resulting image provides an interface to the Forest Inventory Analysis Data-Base (FIADB) and allows generalizations of the estimates for any user defined query window or region of interest (ROI). This methodology, along with geostatistical analysis, is integrated into a client/server Web based geographical information system, which provides Internet users with an easy to use query interface for the FIADB and spatial databases.