Results 21 to 30 of about 35,629,504 (153)

The Depths of Cast Shadow

Remote Sensing, 2019
To improve the accuracy of analysis outputs from remotely sensed images, shadow and illumination effects need to be minimised or removed. Shadow behaviour at different spectral wavelengths needs to be understood to quantify shadow accurately.
Mark Cameron, Lalit Kumar
doaj   +1 more source

THE ROLE OF ASTRO-GEODETIC IN PRECISE GUIDANCE OF LONG TUNNELS [PDF]

The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences, 2015
One of prime aspects of surveying projects is guidance of paths of a long tunnel from different directions and finally ending all paths in a specific place. This kind of underground surveying, because of particular condition, has some different points in
M. Mirghasempour, A. Y. Jafari
doaj   +1 more source

A new five-wavelength photometer operated in Tromsø (69.6°N, 19.2°E)

Earth, Planets and Space, 2018
A new five-wavelength photometer was developed and installed at the EISCAT Tromsø site (69.6°N, 19.2°E) in January 2017. The photometer consists of two units: an optical unit and a control unit together with a PC.
Satonori Nozawa, Tetsuya Kawabata, Keisuke Hosokawa, Yasunobu Ogawa, Takuo Tsuda, Akira Mizuno, Ryoichi Fujii, Chris Hall   +7 more
doaj   +1 more source

Digital zenith camera system for Astro-Geodetic applications in Turkey

Journal of Geodesy and Geoinformation, 2012
There are several current investigations on gravity field of the earth in Geodesy and Geophysics. Earth sciences and space researches are also interested in gravity studies. Geoid, which approximately has an equal potential to the potential of mean sea level, is the main datum for height systems and is used for coordinate transformation, reduction of ...
HALICIOĞLU, Kerem, DENİZ, Rasim, ÖZENER, Haluk   +2 more
openaire   +2 more sources

An Image Segmentation Based on a Genetic Algorithm for Determining Soil Coverage by Crop Residues

Sensors, 2011
Determination of the soil coverage by crop residues after ploughing is a fundamental element of Conservation Agriculture. This paper presents the application of genetic algorithms employed during the fine tuning of the segmentation process of a digital ...
Luis Navarrete, Xavier P. Burgos-Artizzu, Gonzalo Pajares, Maria J. Sanchez del Arco, Angela Ribeiro, Juan Ranz   +5 more
doaj   +1 more source

Experimental demonstration of RGB LED-based optical camera communications [PDF]

, 2015
Red, green, and blue (RGB) light-emitting diodes (LEDs) are widely used in everyday illumination, particularly where color-changing lighting is required.
Ghassemlooy, Zabih, Png, Lih Chieh, Tang, Xuan, Tsai, Hsin-Mu, Han, Dahai, Le Minh, Hoa, Luo, Pengfei, Zhang, Min   +7 more
core   +1 more source

Directional reflectance of light from landscapes on a long transect in Australia – forest to desert

Science of Remote Sensing
The reflectance of land and vegetation observed in satellite imagery depends on sun and viewing geometry. This bidirectional reflectance requires correction for monitoring changes in vegetation cover and condition.
John R. Dymond, James D. Shepherd, Sam Gillingham   +2 more
doaj   +1 more source

Mortars From Punic and Hellenistic–Roman Solunto: Materials, Formulations, and Technology

Archaeometry, EarlyView.
ABSTRACT This study presents an archaeometric investigation of 18 hydraulic rendering and bedding mortars from Punic and Hellenistic–Roman Solunto (NW Sicily). The research aimed to characterize raw materials, reconstruct manufacturing sequences, and evaluate technological proficiency through mineralogical and petrochemical analyses.
G. Montana, G. Polizzi, C. Portale, M. Gasparo Morticelli, L. Randazzo   +4 more
wiley   +1 more source

Expected accuracy of tilt measurements on a novel hexapod-based digital zenith camera system: a Monte-Carlo simulation study [PDF]

Measurement Science and Technology, 2014
Digital zenith camera systems (DZCS) are dedicated astronomical-geodetic measurement systems for the observation of the direction of the plumb line. A DZCS key component is a pair of tilt meters for the determination of the instrumental tilt with respect to the plumb line.
Hirt, Christian, Papp, G., Pal, A., Benedek, J., Szucs, E.   +4 more
openaire   +2 more sources

Depositional processes of varved sediments from proglacial Lago Frías since 1800 CE (North Patagonian Andes, Argentina)

Boreas, EarlyView.
The glacierized Valle Frías in Northern Patagonia is one of the best‐studied valleys in South America and includes varved sediments from Lago Frías. We complement this lacustrine record with a high‐resolution documentation of varve counts and their composition.
Bernd Zolitschka, Philipp Böning, A. Catalina Gebhardt, M. Alicia Irurzun, Wojciech Tylmann, Christoph Vogt, Claudia S. G. Gogorza   +6 more
wiley   +1 more source