(a) Compression performance of temperature (indoor—Berkeley data set): mapping versus no mapping. Logical mapping improves the compression performance by approximately 200% relative to no mapping. Compression ratio using 1D mapping is twice as large as that using 2D mapping. (b) Compression performance of temperature (outdoor—SensorScope data set): mapping versus no mapping. Logical mapping improves the compression. Compression ratio using 1D mapping is twice as large as that using 2D mapping. Wagner-DWT with logical mapping outperforms all other techniques. (c) Compression ratio versus network density: denser sensor networks typically achieve better compression of sensor data.