Sky visibility analysis for astrophysical data return maximization in HERMES constellation

Andrea Colagrossi; Jacopo Prinetto; Stefano Silvestrini; Michèle Lavagna

doi:10.1117/1.jatis.6.4.048001

Sky visibility analysis for astrophysical data return maximization in HERMES constellation

Journal of Astronomical Telescopes Instruments and Systems ◽

10.1117/1.jatis.6.4.048001 ◽

2020 ◽

Vol 6 (04) ◽

Author(s):

Andrea Colagrossi ◽

Jacopo Prinetto ◽

Stefano Silvestrini ◽

Michèle Lavagna

Keyword(s):

Visibility Analysis ◽

Astrophysical Data

Download Full-text

Preliminary Identification of Geological Hazards from Songpinggou to Feihong in Mao County along the Minjiang River Using SBAS-InSAR Technique Integrated Multiple Spatial Analysis Methods

Sustainability ◽

10.3390/su13031017 ◽

2021 ◽

Vol 13 (3) ◽

pp. 1017

Author(s):

Kuanxing Zhu ◽

Peihua Xu ◽

Chen Cao ◽

Lianjing Zheng ◽

Yue Liu ◽

...

Keyword(s):

Spatial Analysis ◽

Surface Deformation ◽

Hot Spot ◽

Field Investigation ◽

Geometric Distortion ◽

Disaster Prevention ◽

Geological Hazards ◽

Visibility Analysis ◽

Preliminary Identification ◽

Sbas Insar

Landslides and collapses are common geological hazards in mountainous areas, posing significant threats to the lives and property of residents. Therefore, early identification of disasters is of great significance for disaster prevention. In this study, we used Small Baseline Subset Interferometric Synthetic Aperture Radar (SBAS-InSAR) technology to process C-band Sentinel-1A images to monitor the surface deformation from Songpinggou to Feihong in Maoxian County, Sichuan Province. Visibility analysis was used to remove the influence of geometric distortion on the SAR images and retain deformation information in the visible area. Hot spot and kernel density analyses were performed on the deformation data, and 18 deformation clusters were obtained. Velocity and slope data were integrated, and 26 disaster areas were interpreted from the 18 deformation clusters, including 20 potential landslides and 6 potential collapses. A detailed field investigation indicated that potential landslides No. 6 and No. 8 had developed cracks and were severely damaged, with a high probability of occurrence. Potential collapse No. 22 had developed fissures, exposing a dangerous rock mass and posing significant threats to the lives and property of residents. This study shows that the proposed method that combines visibility analysis, InSAR deformation rates, and spatial analysis can quickly and accurately identify potential geological disasters and provide guidance for local disaster prevention and mitigation.

Download Full-text

The Shrines of Gadir (Cadiz, Spain) as References for Navigation. GIS Visibility Analysis

Open Archaeology ◽

10.1515/opar-2019-0019 ◽

2019 ◽

Vol 5 (1) ◽

pp. 284-308 ◽

Cited By ~ 1

Author(s):

Natalia López-Sánchez ◽

Ana Mª Niveau-de-Villedary y Mariñas ◽

Juan Ignacio Gómez-González

Keyword(s):

Southern Spain ◽

Visibility Analysis

AbstractThis work analyses the influence of the visibility factor on the configuration of the archaic landscape of the Phoenician city of Gadir (Cadiz, Southern Spain) using the three shrines mentioned by classic sources as a reference. Theoretical or cumulative viewshed analyses are the methods used to investigate the visibility relationships each of the shrines has with the sea and the surrounding territory, as well as with each other. Based on these analyses a series of theoretical interpretations regarding the function of these shrines as references for navigation in Antiquity are established.

Download Full-text