To: “High‐resolution common‐depth‐point reflection profiling: Field acquisition parameter design,” by R. W. Knapp and D. W. Steeples, which appeared in February 1986, GEOPHYSICS, p. 283–294

Geophysics ◽  
1986 ◽  
Vol 51 (7) ◽  
pp. 1519-1519
Keyword(s):  
High Resolution ◽  
Parameter Design ◽  
Maximum Frequency ◽  
Common Depth Point ◽  
Point Reflection

The following errors have been detected. p. 288, left column, 3rd paragraph: Change (Figure 4, Knapp and Steeples, 1986, this issue) to (Figure 3, Knapp and Steeples, 1986, this issue). p. 288, right column, 3rd complete paragraph, 3rd sentence: Change “…when the length of the array is equal to about one‐fourth the apparent surface wavelength…” to “…when the length of the array is equal to about one‐half the apparent surface wavelength…”. Next line, change “ [Formula: see text]” to “[Formula: see text]”. Next line, change “[Formula: see text].” to “[Formula: see text]”. Next line, change “one‐fourth” to “one‐half”. Next 2 equations, change “L ⩽ .25…” to “L ⩽ .5…” and [Formula: see text]…” to “[Formula: see text]…”. p. 289, left column: Change [Formula: see text] to [Formula: see text] Following paragraph, 4th line: Change “.75 m.” to “1.4 m.”; and change “When the maximum frequency value approaches and exceeds 100 Hz (apparent frequency equal to about 70 Hz),…” to “When the maximum frequency value approaches and exceeds 200 Hz (apparent frequency equal to about 140 Hz),…”.

On: “High‐resolution common‐depth point profiling: Field acquisition parameter design,” by R. Knapp and D. Steeples (GEOPHYSICS, 51, 283–294, February, 1986).

Geophysics ◽  
1986 ◽  
Vol 51 (10) ◽  
pp. 2011-2011 ◽  
Author(s):  
W. Harry Mayne
Keyword(s):  
High Resolution ◽  
Parameter Design ◽  
Common Depth Point

I have read your article with interest and congratulate you on an excellent overview of this topic. There are a couple of points on which I would like to comment, however.

Multiple attenuation with 3D high-order high-resolution parabolic Radon transform using lower frequency constraints

Geophysics ◽  
2020 ◽  
Vol 85 (3) ◽  
pp. V317-V328
Author(s):  
Jitao Ma ◽  
Guoyang Xu ◽  
Xiaohong Chen ◽  
Xiaoliu Wang ◽  
Zhenjiang Hao
Keyword(s):  
High Resolution ◽  
Radon Transform ◽  
Seismic Data ◽  
Computational Cost ◽  
Real Data ◽  
Multiple Model ◽  
Multiple Attenuation ◽  
Common Depth Point ◽  
Frequency Constraint ◽  
Parabolic Radon Transform

The parabolic Radon transform is one of the most commonly used multiple attenuation methods in seismic data processing. The 2D Radon transform cannot consider the azimuth effect on seismic data when processing 3D common-depth point gathers; hence, the result of applying this transform is unreliable. Therefore, the 3D Radon transform should be applied. The theory of the 3D Radon transform is first introduced. To address sparse sampling in the crossline direction, a lower frequency constraint is introduced to reduce spatial aliasing and improve the resolution of the Radon transform. An orthogonal polynomial transform, which can fit the amplitude variations in different parabolic directions, is combined with the dealiased 3D high-resolution Radon transform to account for the amplitude variations with offset of seismic data. A multiple model can be estimated with superior accuracy, and improved results can be achieved. Synthetic and real data examples indicate that even though our method comes at a higher computational cost than existing techniques, the developed approach provides better attenuation of multiples for 3D seismic data with amplitude variations.

scholarly journals Parameter Design and Performance Evaluation of a Large-Swath and High-Resolution Space Camera

Sensors ◽  
2021 ◽  
Vol 21 (12) ◽  
pp. 4106
Author(s):  
Yingying Sun ◽  
Peng Rao ◽  
Tingliang Hu
Keyword(s):  
High Resolution ◽  
Design Method ◽  
Grid Point ◽  
Parameter Design ◽  
Weighting Method ◽  
System Parameters ◽  
The Monte Carlo Method ◽  
Repeated Observation ◽  
Large Width ◽  
And Performance

A rotary-scan space camera with an area sensor can achieve large width and high-resolution imaging. Designing system parameters properly is important for the application of the rotary-scan space camera. We model the swath, resolution, and overlap rate between frames for such a camera. An optimum algorithm combining the linear weighting method and the Monte Carlo method for system parameter design is proposed based on the model. Then, the performance of the designed system is evaluated using the grid point method. The designed systems can achieve swaths of more than 1000 km and less than 1 m resolution without leakage during the imaging. In the evaluation, the designed system can cover 82.13% of the observation region at the height of 500 km in 6.5 min, and the average repeated observation frequency is 3.26 times per 118 s. The design method is simple and effective in the initial design of the rotary-scan space camera’s system parameters. The system designed can provide “no-leakage and wide coverage by quick scan” and “high-frequency repeated observation over a long visibility period.” This will greatly improve earth observation ability in wide-area search and rescue missions.

High‐resolution common‐depth‐point reflection profiling:Field acquisition parameter design

Geophysics ◽  
1986 ◽  
Vol 51 (2) ◽  
pp. 283-294 ◽  
Author(s):  
Ralph W. Knapp ◽  
Don W. Steeples
Keyword(s):  
High Resolution ◽  
Dynamic Range ◽  
Spectral Response ◽  
Seismic Energy ◽  
Energy Sources ◽  
Spectral Character ◽  
Analog To Digital ◽  
Field Recording ◽  
Analog To Digital Conversion ◽  
Point Reflection

The results of a seismic reflection profiling exercise are strongly dependent upon parameters used in field recording. The choice of parameters is determined by objectives of the survey, available resources, and geologic locality. Some simple modeling and/or a walkaway noise survey are helpful in choice of field parameters. Filtering data before analog‐to‐digital conversion in the field can help overcome limitations in the dynamic range of the seismograph. Source and geophone arrays can be used to a limited extent in high‐resolution surveys to help attenuate ground roll. Proper planting of geophones can be an important factor in obtaining the flattest spectral response. Various seismic energy sources provide the flattest spectral response. Various seismic energy sources provide different spectral character and varying degrees of convenience and cost.

Crustal Velocities from Marine Common Depth Point Reflection Data

2013 ◽  
pp. 271-288
Author(s):  
Joel S. Watkins ◽  
Richard T. Buffler ◽  
Mark H. Houston ◽  
John W. Ladd ◽  
Thomas H. Shipley ◽  
...  
Keyword(s):  
Reflection Data ◽  
Common Depth Point ◽  
Point Reflection

scholarly journals High‐resolution common‐depth‐point seismic reflection profiling: Instrumentation

Geophysics ◽  
1986 ◽  
Vol 51 (2) ◽  
pp. 276-282 ◽  
Author(s):  
Ralph W. Knapp ◽  
Don W. Steeples
Keyword(s):  
High Resolution ◽  
High Frequency ◽  
Dynamic Range ◽  
Low Frequency ◽  
Main Element ◽  
Critical Element ◽  
Frequency Signal ◽  
High Frequency Signal ◽  
Common Depth Point ◽  
Seismic Recording

Seismic recording hardware must be a deliberately designed system to extract and record high‐resolution information faithfully. The single most critical element of this system is the detector. The detector chosen must be capable of faithfully generating the passband expected and furthermore, must be carefully coupled to the ground. Another important factor is to shape the energy passband so that it is as flat and broad as possible. This involves low‐cut filtering of the data before A/D conversion so the magnitude of the low‐frequency signal does not swamp the high‐frequency signal. The objective is to permit boosting the magnitude of the high‐frequency signals to fill a significant number of bits of the digital word. Judicious use of a low‐cut filter is the main element of this step, although detector selection is also a factor because detectors have a −6 dB/octave velocity response at frequencies less than the resonant frequency of the detector. Finally, recording instrument quality must be good. Amplifiers should have low system noise, large dynamic range, and precision of 12 or more bits.

Observations of the spatial structure of interstellar hydrogen

1967 ◽  
Vol 31 ◽  
pp. 45-46
Author(s):  
Carl Heiles
Keyword(s):  
High Resolution ◽  
Spatial Structure ◽  
Velocity Dispersion ◽  
Temperature Variations

High-resolution 21-cm line observations in a region aroundlII= 120°,b11= +15°, have revealed four types of structure in the interstellar hydrogen: a smooth background, large sheets of density 2 atoms cm-3, clouds occurring mostly in groups, and ‘Cloudlets’ of a few solar masses and a few parsecs in size; the velocity dispersion in the Cloudlets is only 1 km/sec. Strong temperature variations in the gas are in evidence.

Combining integrated systems-biology approaches with intervention-based experimental design provides a higher-resolution path forward for microbiome research

2019 ◽  
Vol 42 ◽  
Author(s):  
J. Alfredo Blakeley-Ruiz ◽  
Carlee S. McClintock ◽  
Ralph Lydic ◽  
Helen A. Baghdoyan ◽  
James J. Choo ◽  
...  
Keyword(s):  
Systems Biology ◽  
High Resolution ◽  
Experimental Design ◽  
Integrated Systems ◽  
Microbiome Research ◽  
Constructive Criticism

Abstract The Hooks et al. review of microbiota-gut-brain (MGB) literature provides a constructive criticism of the general approaches encompassing MGB research. This commentary extends their review by: (a) highlighting capabilities of advanced systems-biology “-omics” techniques for microbiome research and (b) recommending that combining these high-resolution techniques with intervention-based experimental design may be the path forward for future MGB research.

Very High Resolution Analysis of the Dynamics of a Coronal Plasmoid

1994 ◽  
Vol 144 ◽  
pp. 593-596
Author(s):  
O. Bouchard ◽  
S. Koutchmy ◽  
L. November ◽  
J.-C. Vial ◽  
J. B. Zirker
Keyword(s):  
High Resolution ◽  
Solar Eclipse ◽  
Total Solar Eclipse ◽  
Field Of View ◽  
Small Field ◽  
High Resolution Analysis ◽  
Ccd Observations ◽  
Resolution Analysis ◽  
Very High ◽  
Small Field Of View

AbstractWe present the results of the analysis of a movie taken over a small field of view in the intermediate corona at a spatial resolution of 0.5“, a temporal resolution of 1 s and a spectral passband of 7 nm. These CCD observations were made at the prime focus of the 3.6 m aperture CFHT telescope during the 1991 total solar eclipse.

FeXIV Line Emission Polarization of the July 11, 1991 Solar Corona

1994 ◽  
Vol 144 ◽  
pp. 541-547
Author(s):  
J. Sýkora ◽  
J. Rybák ◽  
P. Ambrož
Keyword(s):  
High Resolution ◽  
Solar Corona ◽  
Emission Line ◽  
Solar Eclipse ◽  
White Light ◽  
Preliminary Analysis ◽  
Line Emission ◽  
Total Solar Eclipse ◽  
Degree Of Polarization ◽  
High Resolution Images

AbstractHigh resolution images, obtained during July 11, 1991 total solar eclipse, allowed us to estimate the degree of solar corona polarization in the light of FeXIV 530.3 nm emission line and in the white light, as well. Very preliminary analysis reveals remarkable differences in the degree of polarization for both sets of data, particularly as for level of polarization and its distribution around the Sun’s limb.

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