Results 41 to 50 of about 166,463 (182)

Heat as a proxy to image dynamic processes with 4D electrical resistivity tomography [PDF]

open access: yes, 2019
Since salt cannot always be used as a geophysical tracer (because it may pollute the aquifer with the mass that is necessary to induce a geophysical contrast), and since in many contaminated aquifer salts (e.g., chloride) already constitute the main ...
Bolly, Pierre-Yves   +4 more
core   +1 more source

Correcting Multibeam Echosounder Bathymetric Measurements for Errors Induced by Inaccurate Water Column Sound Speeds

open access: yesIEEE Access, 2019
In this contribution a method for correcting bathymetric measurements affected by inaccurate water column sound speed profiles (SSPs) is presented. The method exploits the redundancy in the multibeam echosounder measurements obtained from the overlap of ...
Tannaz H. Mohammadloo   +4 more
doaj   +1 more source

Theoretical Spectral Models of the Planet HD 209458b with a Thermal Inversion and Water Emission Bands [PDF]

open access: yes, 2007
We find that a theoretical fit to all the HD 209458b data at secondary eclipse requires that the dayside atmosphere of HD 209458b have a thermal inversion and a stratosphere.
A. Burrows   +5 more
core   +2 more sources

Tidal matched field processing inversion for water depth and source range in the Intimate96 test [PDF]

open access: yesThe Journal of the Acoustical Society of America, 2002
Examining Intimate96 hydrophone data (300 to 800 Hz) we see clearly the effects of tidal changes, i.e., of changing water depths. In this work we will examine Matched Field Processing (MFP) sensitivity at that range of frequencies to expected tidal changes (the depth varies ±1.0 m from the nominal of 135 m).
A. Tolstoy, S. Jesus, O. Rodríguez
openaire   +1 more source

Shallow water depth (≤5 m) estimation based on single-beam echo sounder and optical satellites

open access: yesGeocarto International
This study combined single-beam echo sounder data with PlanetScope multispectral data to invert shallow water depth (≤5 m) around Weizhou Island, analyzing how each band's reflectance varies with depth by establishing their quantitative relationship and ...
Jianqu Chen   +9 more
doaj   +1 more source

Estimating specific inherent optical properties of tropical coastal waters using bio-optical model inversion and in situ measurements: case of the Berau estuary, East Kalimantan, Indonesia [PDF]

open access: yes, 2010
Specific inherent optical properties (SIOP) of the Berau coastal waters were derived from in situ measurements and inversion of an ocean color model. Field measurements of water-leaving reflectance, total suspended matter (TSM), and chlorophyll a (Chl a)
Ambarwulan, W.   +3 more
core   +3 more sources

UAV Remote Sensing Inversion of Pond Water Depth Based on Color-Space Conversion

open access: yesRedai dili
Shore-based ponds are small water bodies widely distributed in coastal areas and play important roles in aquaculture, agricultural irrigation, and ecological regulation. Accurate and efficient water-depth monitoring is key to the scientific management of
Ma Luodan   +9 more
doaj   +1 more source

Evaluation of mineralogy per geological layers by Approximate Bayesian Computation

open access: yes, 2019
We propose a new methodology to perform mineralogic inversion from wellbore logs based on a Bayesian linear regression model. Our method essentially relies on three steps.
Bruned, Vianney   +3 more
core   +3 more sources

Hypocenter Distribution of Low Frequency Event at Papandayan Volcano [PDF]

open access: yes, 2016
Papandayan volcano is a stratovolcano with irregular cone-shaped has eight craters around the peak. The most active crater in Papandayan is a Mas crater.
Hasan, M. M. (Muhammad)   +3 more
core   +1 more source

Research of the Dual-Band Log-Linear Analysis Model Based on Physics for Bathymetry without In-Situ Depth Data in the South China Sea

open access: yesRemote Sensing, 2021
The current widely used bathymetric inversion model based on multispectral satellite imagery mostly relies on in-situ depth data for establishing a liner/non-linear relationship between water depth and pixel reflectance.
Weidong Zhu   +9 more
doaj   +1 more source

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