scholarly journals - Lunar Clinopyroxene Abundance Retrieved from M3 Data Based on Topographic Correction

2014 ◽  
pp. 172-189 ◽  
Keyword(s):  
Topographic Correction

Topographic correction of HiRISE and CaSSIS images: Validation and application to color observations of Martian albedo features

2021 ◽  
Vol 200 ◽  
pp. 105198
Author(s):  
G. Munaretto ◽  
M. Pajola ◽  
A. Lucchetti ◽  
C. Re ◽  
G. Cremonese ◽  
...  
Keyword(s):  
Topographic Correction

Evaluation of Topographic Correction Models Based on 3-D Radiative Transfer Simulation

2021 ◽  
pp. 1-5
Author(s):  
Haojing Chi ◽  
Kai Yan ◽  
Kai Yang ◽  
Shuyuan Du ◽  
Hanliang Li ◽  
...  
Keyword(s):  
Radiative Transfer ◽  
Topographic Correction

scholarly journals Differences in Carbon Sink by Land Use using Topographic Correction in Seoul, South Korea

2016 ◽  
Vol 61 (1) ◽  
pp. 7-15
Author(s):  
Sung–Ho Kil ◽  
Dong–kun Lee ◽  
Gwan–Soo Park ◽  
Sang–Jin Lee ◽  
Shoji Ohga
Keyword(s):  
Land Use ◽  
South Korea ◽  
Carbon Sink ◽  
Topographic Correction

scholarly journals TOPOGRAPHIC EFFECT ON SPECTRAL VEGETATION INDICES FROM LANDSAT TM DATA: IS TOPOGRAPHIC CORRECTION NECESSARY?

2016 ◽  
Vol 22 (1) ◽  
pp. 95-107 ◽  
Author(s):  
Eder Paulo Moreira* ◽  
Márcio de Morisson Valeriano ◽  
Ieda Del Arco Sanches ◽  
Antonio Roberto Formaggio
Keyword(s):  
Near Infrared ◽  
Incidence Angle ◽  
Spectral Band ◽  
Vegetation Indices ◽  
Topographic Effect ◽  
Topographic Correction ◽  
Spectral Bands ◽  
Spectral Vegetation Indices ◽  
Current Availability ◽  
Elevation Model

The full potentiality of spectral vegetation indices (VIs) can only be evaluated after removing topographic, atmospheric and soil background effects from radiometric data. Concerning the former effect, the topographic effect was barely investigated in the context of VIs, despite the current availability correction methods and Digital elevation Model (DEM). In this study, we performed topographic correction on Landsat 5 TM spectral bands and evaluated the topographic effect on four VIs: NDVI, RVI, EVI and SAVI. The evaluation was based on analyses of mean and standard deviation of VIs and TM band 4 (near-infrared), and on linear regression analyses between these variables and the cosine of the solar incidence angle on terrain surface (cos i). The results indicated that VIs are less sensitive to topographic effect than the uncorrected spectral band. Among VIs, NDVI and RVI were less sensitive to topographic effect than EVI and SAVI. All VIs showed to be fully independent of topographic effect only after correction. It can be concluded that the topographic correction is required for a consistent reduction of the topographic effect on the VIs from rugged terrain.

Topographic Correction for the Data of SQUID-based TEM Using a Ground Loop

2019 ◽  
Vol 24 (1) ◽  
pp. 111-117
Author(s):  
Yanju Ji ◽  
Yi Zhao ◽  
Shangyu Du ◽  
Dongsheng Li ◽  
Yi Zhang ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Quantum Interference ◽  
Low Frequency ◽  
High Sensitivity ◽  
Absolute Error ◽  
Correction Method ◽  
Topographic Effects ◽  
Topographic Correction ◽  
Transient Electromagnetic ◽  
Ground Loop

Superconducting quantum interference device (SQUID) can be used to detect the signal of transient electromagnetic method (TEM) due to its superiority of high sensitivity in the low frequency range. However, the measuring direction of SQUID is hardly consistent with the normal direction of the transmitting coil of a TEM system because of the undulating topography in the field. In this case, the central magnetic field measured by SQUID is only a component of the theoretical central magnetic field. There will be larger errors if we directly use the measured central magnetic field for geological interpretation. To solve this problem, we propose a topographic correction method for the data of SQUID-based TEM using ground loop. The theoretical central magnetic field of the ground loop is calculated after the trapezoidal transmitting current wave is turned off. Then, we use the theoretical central magnetic field of the ground loop as the reference to correct the measured central magnetic field of SQUID-based on the trigonometric function relation between the measuring direction of SQUID and the topographic inclination. The experiment of SQUID-based TEM using a ground loop was carried out in the field. The result shows that at the measurement point with larger topographic inclination, the average absolute error of the measured central magnetic field reduces significantly with the proposed correction method. This method can also be applied to the correction of complex topographic effects when using SQUID to measure three components of magnetic field.

scholarly journals Analysis of the ASTER Image Topographic Correction Method in Complex Mountain Areas

2020 ◽  
Vol 446 ◽  
pp. 052105
Author(s):  
Jiaojiao Sun ◽  
Qi Wang ◽  
Jie Zheng ◽  
Zilong Wang ◽  
Yijiang Guo
Keyword(s):  
Correction Method ◽  
Mountain Areas ◽  
Topographic Correction ◽  
Aster Image
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