Remote sensing activities from satellite are important aspect togain information about earth surface, thus has significance on military, economic and geology fields. After 1962, the term remote became popular typically refers to non-intrusive observation of Earth using electromagnetic waves a platform some distance away object study. implies measurement made by indirect or “remote” means rather...

Context. The quasar-type blazar 3C 454.3 underwent a phase of high activity in summer and autumn 2007, which was intensively monitored in the radio-to-optical bands by the Whole Earth Blazar Telescope (WEBT). The γ-ray satellite Astro-rivelatore Gamma a Immagini LEggero (AGILE) detected this source first in late July, and then in November–December 2007. Aims. In this letter we present the multi...

With the drastic advances in technology over the past decades, the availability, as well as the quantity, of large data sets for research in almost every scientific field has increased dramati‐ cally. More specifically, the availability of earth observation-based imagery data and satellite information for research purposes and practical applications has grown with many organiza‐ tions such as t...

Introduction: The synchronous rotation of a planetary satellite should generate a spatial variation in the crater production rate on its surface [1-9]. The production rate that has the maximum at the apex (equator, 90 ̊W) of the orbital motion of the satellite decreases with increase in angular distance from the apex and becomes the minimum at the antapex (equator, 90 ̊E). The degree of the apex-...

An autonomous navigation algorithm using the sensor that integrated the star sensor (FOV1) and ultraviolet earth sensor (FOV2) is presented. The star images are sampled by FOV1, and the ultraviolet earth images are sampled by the FOV2. The star identification algorithm and star tracking algorithm are executed at FOV1. Then, the optical axis direction of FOV1 at J2000.0 coordinate system is calc...

Combination of different satellite data will provide increased opportunities for more frequent cloud-free surface observations due to variable cloud cover at the different satellite overpass times and dates. Satellite data from the polar-orbiting Landsat-8 (launched 2013), Sentinel-2A (launched 2015) and Sentinel-2B (launched 2017) sensors offer 10 m to 30 m multi-spectral global coverage. Toge...

Efficient scheduling is of great significance to rationally make use of scarce satellite resources. Task clustering has been demonstrated to realize an effective strategy to improve the efficiency of satellite scheduling. However, the previous task clustering strategy is static. That is, it is integrated into the scheduling in a two-phase manner rather than in a dynamic fashion, without express...