... Page, C. G. 2003, in ASP Conf. ... In database terms this requires a spatial join between tables. Two algorithms for spatial joins (pixel-code and R-tree join) were compared, and the performance of three DBMS (DB2, MySQL, and PostgreSQL) was evaluated using large source catalogs. ... Join using the true spatial indexing built into some DBMS. ... 156.7 secs . ... 355 secs Spatial joins using R-tree indexing were also tested on larger datasets (3.6 million rows of USNO-B, 5 million rows of 2MASS): . ...