Multi-dimensional Range Queries in Sensor Networks

In many sensor networks, data or events are named by attributes. Many of these attributes have scalar values, so one natural way to query events of interest is to use a multidimensional range query. An example is: "List all events whose temperature lies between 50 # and 60 # , and whose light levels lie between 10 and 15." Such queries are useful for correlating events occurring within the network