This directory contains snapshots of the Paradise GUI while processing the data corresponding to Europe. Description of the Europe data. The database for this sample consists of the following extents : Land : Consisting of polygons that represent the contours of the land masses of Europe. Borders : Consisting of polylines that represent the national boundaries. Lakes : Consisting of polygons corresponding to the lakes in Europe. Cities : Consisting of city name, country name, population and the geographic location of the city. Rivers : Consisting of polylines corresponding to the rivers in Europe. The projection system used here is LAEA with the center near Dublin. This data was got from the folks working on GEO++ at The TNO Institute of Perception, The Netherlands. PS : This political boundaries in this data is outdated. If you happen to know where I could get hold of data for the current political boundaries, please let me know. Description of Files in this directory : ---------------------------------------- A ) Root.gif ~~~~~~~~~~~~ The root.gif shows a snapshot of the Paradise client while displaying the results of the query select city.country, city.name, city.population, city.geo_loc, river.geo_pline from city, river where city.population > 3000000 and river.geo_pline overlaps city.geo_loc.makeBox(500) This query performs a "spatial join" between the cities extent and the river extent. The query selects all the cities that have a population greater than 3M, makes a box of side 500 units (meters) around the selected cities, and finds all rivers that overlap with the constructed boxes. There are 3 windows in the screen dump. At the top left is the "Map View" window which displays the results of queries on a 2-D map. The query that is run is displayed on the window to the right of this window. One can click on the 2-D map and "select" a specific object. As an example, posistioning th mouse near the icon for "Paris", pops up the "Tuple Dialog" box, which is at the bottom of the screen. The attributes of the object and the corresponding values are shown here. Note that the buttons for spatial attributes "city.location" and "city.shape" are active. By clicking on these, one could customize the display of the objects on the screen, i.e. choose a color for display, choose an icon, choose a label ... B ) mapView.gif ~~~~~~~~~~~~~~~ This is the screen dump of the "Map View" window by itself.