T

Taylor series expansion, 178-179 TDR. See Time domain reflectometry (TDR) TEC. See True Electron Content (TEC) Technology advances in GPR methods, 26 Tectonophysics, 3

Telluric, magnetelluric (MT) method, 113 Temperature, 32, 88, 90 Temperature conversion factor, 20, 61 Temporal and spatial high-resolution measurements, 314, 325

Temporal variations, 148 Tesla, 148 Thalen, Robert, 4 Thalen-Tiberg magnetometers, 4 Thermal noise, 173

Thermocouple temperature probes, 274 Thomson-Thalen magnetometers, 4 Three-dimensional (3D) position, 166, 194 Three-dimensional displays, 143-144 Three-dimensional mapping of soil, 346 Three-dimensional modeling of radar, 51-53 Time and frequency domain, 115-116 Time-dependent geophysical technique, 129 Time-distance cross section, 140, 141 Time domain reflectometry (TDR), 26-27 agricultural research techniques, 17-18 calibration curves developed for, 328, 330 defined,391

field-scale soil salinity assessment, 27 and geospatial measurement of EC, 59 GPR compared to, 48, 53 GPR profiles, 365 vs. GPR technique, 324-325 measurement of soil ECa, 62, 63-64 point source technique, 26-27 soil water content measurement, 317, 320, 323 Time-domain system, 113 Time-domain wave, 130 Time-of-measurement dependent, 65 Time-slice amplitude maps GPR methods, 9, 11 mapping, 355, 358-361, 365, 371-372 Time-varying EM energy, 112 TM. See Landsat Thematic Mapper (TM) Tomographic procedures, 14, 323 Topcon receivers, 195 Topographical variables, 258 Topography, 255-256 Topp's equation, 309, 313, 324, 333 Torsion balance gravity measurements, 4 Trace, 139 Transects, 8, 9 Transmission frequency, 99 Transmit and receive antennas, 137 Transmit antenna, 135-136 Transmitted electrolytically through soil, 90 Transmitter and receiver, 113, 116-118, 134-135

Transverse Mercator projection, 205 Travel direction, 158-160 Travel time, 134 Tree root mass, 375-376, 381 Triangulation in space, 166, 179 Trimble AgGPS series, 195 Trimble Navigation Ltd., 63, 212 Trimble PRO-XR GPS, 274 Trimble VRS™, 188-189 True Electron Content (TEC), 170 2-D Migration (2DM), 356, 358, 361 Two-dimensional (2D) position, 166 Two-dimensional displays, 142

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