Earth Search Sciences, Inc. has four wholly-owned subsidiaries: Skywatch Exploration, Inc., Polyspectrum Imaging, Inc., Geoprobe, Inc., and STDC, Inc. In addition, there are five majority-owned consolidated subsidiaries: Earth Search Resources, Inc., Eco Probe, Inc., ESSI Probe 1 LC, Petro Probe, Inc. and Terranet, Inc. The 50% owned subsidiary ESSI Probe 1 LC was formed as a joint venture to own and operate hyperspectral instruments. All subsidiaries excepting Petro Probe and Geoprobe were inactive during the fiscal years ended March 31, 2007 and 2006.
The Company utilizes an aircraft mounted hyperspectral remote sensing instrument to gather precise geological data from the surface of the Earth. Solar energy is reflected from surface materials and the instrument, called "Probe-1", captures the data in digital form. The Probe-1 is a "whiskbroom style" instrument that collects data in a cross-track direction by mechanical scanning and in an along-track direction by movement of the airborne platform. The instrument acts as an imaging spectrometer in the reflected solar region of the electromagnetic spectrum (0.4 to 2.5 nm). In the VNIR and SWIR, the at-sensor radiance is dispersed by four spectrographs onto four detector arrays. Spectral coverage is nearly continuous in these regions with small gaps in the middle of the 1.4 and 1.9 nm atmospheric water bands. In order to avoid geometric distortions in the recorded imagery, the Probe-1 is mounted on a 3 axis, gyro-stabilized mount. Geolocation of nadir pixels is assisted by the recording of aircraft GPS positional data and tagging each scan line with a time that is referenced to the UTC time interrupts from the GPS receiver.
