To: “Selection of a Suitable Model for Quantitative Interpretation of Towed‐Bird AEM Measurements”, by G. J. Palacky, GEOPHYSICS, v. 43, p. 576–587 (April 1978)

Geophysics ◽  
1978 ◽  
Vol 43 (6) ◽  
pp. 1312-1312
Keyword(s):  
Suitable Model ◽  
Quantitative Interpretation ◽  
Electromagnetic System ◽  
Registered Trademark ◽  
Airborne Electromagnetic ◽  
Selection Of

In the paper, “Selection of a Suitable Model for Quantitative Interpretation of Towed‐Bird AEM Measurements”, by G. J. Palacky, Geophysics, v. 43, p. 576–587 (April 1978), the Input® airborne electromagnetic system was not identified as being a Registered Trademark of Barringer Research Ltd.

COMPUTER DATA PROCESSING AND QUANTITATIVE INTERPRETATION OF AIRBORNE RESISTIVITY SURVEYS

Geophysics ◽  
1975 ◽  
Vol 40 (5) ◽  
pp. 818-830 ◽  
Author(s):  
G. J. Palacky ◽  
F. L. Jagodits
Keyword(s):  
Electric Fields ◽  
Simultaneous Recording ◽  
Quantitative Interpretation ◽  
Geologic Mapping ◽  
Electromagnetic System ◽  
Computer Data ◽  
Type Curves ◽  
Intermediate Data ◽  
Processing Cost ◽  
Airborne Electromagnetic

The recently constructed airborne electromagnetic system called E-Phase measures the intensity of the vertical and horizontal electric fields. Standard broadcasting, VLF, and LF navigation aid transmitters are used as sources of the primary EM field. A system of this kind responds best to horizontal layers of large extent and therefore is suitable for geologic mapping and for the detection of resistive materials such as gravel and permafrost. A successful application of the system would not have been possible without digital recording of the data and subsequent computer processing. An efficient algorithm consisting of three processing steps assures low processing cost and provides for two intermediate data checks. Final outputs are printer plots of apparent resistivity for all flight lines and maps of stacked profiles or contours. Quantitative interpretation was made possible by the simultaneous recording of the data at three transmitter frequencies and by the availability of theoretical solutions for layered media. Instead of generating an atlas of type curves, an interactive program was written which enables the geophysicist to rapidly obtain apparent resistivities assuming a three‐layer model. A close match with the measured data is easy to achieve when a reasonable estimate of two of the parameters (resistivities, thicknesses) can be made initially. The interpretation procedure is demonstrated on a case history, a 1973 survey conducted near Wadena, Saskatchewan.

QUANTITATIVE INTERPRETATION OF INPUT AEM MEASUREMENTS

Geophysics ◽  
1973 ◽  
Vol 38 (6) ◽  
pp. 1145-1158 ◽  
Author(s):  
G. J. Palacky ◽  
G. F. West
Keyword(s):  
Decay Rate ◽  
Half Space ◽  
Half Plane ◽  
Quantitative Approach ◽  
Quantitative Interpretation ◽  
Electromagnetic System ◽  
Quantitative Models ◽  
Apparent Conductivity ◽  
Homogeneous Half Space ◽  
Airborne Electromagnetic

Recent improvements of the INPUT airborne electromagnetic system have made possible a more quantitative approach to interpretation. The necessary interpretational aids can be obtained in two ways: either by correlating the system and ground EM measurements, or by devising computational or analog quantitative models. Both approaches have been explored. In the former, the system decay rate can be correlated with the apparent conductivity‐thickness (σt) estimated by ground surveys. In the latter, four quantitative models were investigated, vertical half‐plane, vertical ribbon, dipping half‐plane, and homogeneous half‐space. Nomograms have been constructed which make it possible to determine σt, conductor depth, and dip for sheet‐like conductors, and conductivity for a homogeneous half‐space. Field examples show that this procedure can be used satisfactorily in the routine interpretation of records obtained by this system.

scholarly journals Selection of a suitable data set and model for the genetic evaluation of the linear description of conformation and type description in Old Kladruber horses

2012 ◽  
Vol 55 (2) ◽  
pp. 105-112
Author(s):  
L. Vostrý ◽  
K. Mach ◽  
J. Přibyl
Keyword(s):  
Random Effects ◽  
Fixed Effects ◽  
Genetic Parameters ◽  
Suitable Model ◽  
Residual Variance ◽  
Linear Type ◽  
Colour Variant ◽  
Repeated Evaluation ◽  
Estimation Of Genetic Parameters ◽  
Selection Of

Abstract. The objective of this paper was to select a suitable data subset and statistical model for the estimation of genetic parameters for 36 traits of the linear type in 977 Old Kladruber horses. Two subsets were tested to identify a suitable subset for analysis. One subset included repeated evaluation of certain individuals, whereas the other did not. The most suitable subset included repeated evaluation (n=1 390). The selection of a suitable model was made from 4 candidate models. These models comprised a number of random effects (direct individual effect and animal permanent environmental effect of the animal) and a number of fixed effects (colour variant, stud, colour variant × stud interaction, sex, age at description, year of birth, year of description). The model was selected based on the Akaike information criterion (AIC, Akaike 1974), residual variance and heritability coefficient. The model that included colour variant, stud, colour variant × stud interaction, sex, age at description, and year of description as fixed effects and direct individual and animal permanent environment as random effects was the most suitable model for the estimation of genetic parameters and for the subsequent estimation of breeding values.

Development And Evaluation Of A Second-Generation Airborne Electromagnetic System For Detection Of Unexploded Ordnance

2002 ◽  
Author(s):  
William E. Doll ◽  
T. Jeffrey Gamey ◽  
Les P. Beard ◽  
David T. Bell ◽  
J.S. Holladay ◽  
...  
Keyword(s):  
Second Generation ◽  
Unexploded Ordnance ◽  
Electromagnetic System ◽  
Airborne Electromagnetic

An example of 3D conductivity mapping using the TEMPEST airborne electromagnetic system

2000 ◽  
Vol 31 (1-2) ◽  
pp. 162-172 ◽  
Author(s):  
Richard Lane ◽  
Andy Green ◽  
Chris Golding ◽  
Matt Owers ◽  
Phil Pik ◽  
...  
Keyword(s):  
Electromagnetic System ◽  
The Tempest ◽  
Airborne Electromagnetic

MAPPING EARTH CONDUCTIVITIES USING A MULTIFREQUENCY AIRBORNE ELECTROMAGNETIC SYSTEM

Geophysics ◽  
1978 ◽  
Vol 43 (3) ◽  
pp. 563-575 ◽  
Author(s):  
H. O. Seigel ◽  
D. H. Pitcher
Keyword(s):  
Thin Sheet ◽  
Radar Altimeter ◽  
Electromagnetic System ◽  
Near Surface ◽  
Quantitative Estimates ◽  
Simple Geometry ◽  
Airborne Electromagnetic ◽  
Groundwater Mapping ◽  
Actual Field ◽  
Depth Of Burial

The Tridem vertical coplanar airborne electromagnetic system provides simultaneous in‐phase and quadrature information at frequencies of 500, 2000 and 8000 Hz. The system can map a broad range of earth conductors of simple geometry and provide quantitative estimates of their conductivities and dimensions. Computer programs have been developed to automatically interpret the six channels of Tridem data, plus the output of an accurate radar altimeter, to determine the depth of burial, conductivity and thickness of a near‐surface, flat‐lying conducting horizon. In limiting cases, the interpretation provides the conductance (conductivity‐thickness product) of a thin sheet (ranging from 100 mmhos to 100 mhos) or the conductivity of a homogeneous earth (ranging from 1 mmhos/m to 10 mhos/m). Two actual field examples are presented from Ontario, Canada; one relating to the mapping of overburden conditions (sand, clay and rock, etc) and the other to the mapping of the distribution of a buried lignite deposit. Other areas of potential application of the system to surficial materials would include groundwater mapping, permafrost investigations, and civil engineering studies for roads and pipelines.

27. Viability of an Airborne Electromagnetic System for Mapping of Shallow Buried Metals

2005 ◽  
pp. 653-662
Author(s):  
William E. Doll ◽  
T. Jeffrey Gamey ◽  
J. Scott Holladay ◽  
James L. C. Lee
Keyword(s):  
Electromagnetic System ◽  
Airborne Electromagnetic

scholarly journals Selection of a suitable model for the prediction of soil water content in north of Iran

2015 ◽  
Vol 13 (1) ◽  
pp. e1202 ◽  
Author(s):  
Leila Esmaeelnejad ◽  
Hassan Ramezanpour ◽  
Javad Seyedmohammadi ◽  
Mahmood Shabanpour
Keyword(s):  
Water Content ◽  
Soil Water ◽  
Soil Water Content ◽  
Suitable Model ◽  
North Of Iran ◽  
Selection Of

scholarly journals Selection of a suitable data set and model for the estimation of genetic parameters of the weaning weight in beef cattle

2007 ◽  
Vol 50 (6) ◽  
pp. 562-574
Author(s):  
L. Vostrý ◽  
J. Přibyl ◽  
Z. Veselá ◽  
V. Jakubec
Keyword(s):  
Beef Cattle ◽  
Fixed Effects ◽  
Genetic Parameters ◽  
Genetic Correlations ◽  
Genetic Effect ◽  
Suitable Model ◽  
Data Set ◽  
Weaning Weight ◽  
Estimation Of Genetic Parameters ◽  
Selection Of

Abstract. The objective of this paper was to select a suitable data subset and statistical model for the estimation of genetic parameters for weaning weight of beef cattle in the Czech Republic. Nine subsets were tested for the selection of a suitable subset. The subsets differed from each other in the limit of sampling criteria. The most suitable subset satisfied these conditions: at least 5 individuals per each sire, 5 individuals per HYS (herd, year, season), 2 sires per HYS, and individuals per dams that have at least one half-sister and two offspring (n = 4 806). The selection of a suitable model was carried out from 10 models. These models comprised some of the random effects: direct genetic effect, maternal genetic effect, permanent maternal environment effect, HYS, sire × herd or sire × year interaction, and some of the fixed effects: dam’s age, sex (young bull, heifer × single, twin born), HYS, year, herd. The direct heritability (h2a) ranged from 0.06 to 0.17, of maternal heritability (h2m) from 0.03 to 0.06. The genetic correlations between the direct and maternal effect (ram) were in the range of –0.15 –0.42.

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