In recent years the use of remote sensing imagery to classify and map vegetation over different spatial scales has gained wide acceptance in the research community. Many national and regional datasets have been derived using remote sensing data. However, much of this research was undertaken using multispectral remote sensing datasets. With advances in remote sensing technologies, the use of hyp...

We present a comparison of the leftover satellites at z=0 in a cold dark matter dominated simulation of the formation of the Local Group to the distribution of observed neutral hydrogen high-velocity clouds and compact high-velocity clouds. The ∼2000 leftover satellites in the simulation have dark matter masses which range between 0.5 to 10 × 10 9 M ⊙ , sizes between 3 to 30 kpc, and distances ...

The scale of cloud clusters occurring in the tropical North Pacific is objectively derived from vidicon data received from the ESSA satellites for July and October 1967 and January and April 1968. Attention is focused on the intertropical convergence zone, which is defined to be the 10' latitude strip .with greatest average brightness. The predominant width of cloud clusters is found to range f...

The effects of aerodynamic perturbation forces on the orbital life of low altitude Low Earth Orbit (LEO) satellites are investigated, with a focus on the secular perturbations caused by lift and drag. The secular effects can be divided into the circularization of the orbit for both lift and drag perturbation forces, and the decrease of the orbit semimajor axis for drag perturbation. A study of ...

TanDEM-X opens a new era in space borne radar remote sensing. The first bistatic SAR mission, is formed by adding a second, almost identical spacecraft, to TerraSAR-X and flying the two satellites in a closely controlled formation with typical distances between 250 and 500 m. Primary mission objective is the generation of a consistent global digital elevation model with an unprecedented accurac...

The eccentricity of a system of two planets locked into a 2:1 resonance grows as the planets migrate inwards through a gaseous protoplanetary disk. We show that this can lead to large eccentricities of the inner planet, even when the outer planet has a mass low enough to have eluded detection with current surveys. If most of the observed extrasolar planetary systems initially harboured extra pl...

Assume that a constellation of satellites is required to flight close a given nominal trajectory and that there is some freedom in the selection of the geometry of the constellation. If we are interested in avoiding large variations of the mutual distances between the spacecrafts, we can consider the possible existence of regions of zero relative radial acceleration with respect to the nominal ...

A modified gravity (MOG) theory, that has been successfully fitted to galaxy rotational velocity data, cluster data, the Bullet Cluster 1E0657-56 and cosmological observations, is fitted to the motion of satellite galaxies around host galaxies at distances 50-400 kpc providing a new sensitive test for MOG. We show that observational data from the Sloan Digital Sky Survey are consistent with MOG...

Galileo sequences are generalizations of a simple sequence of integers that Galileo used in early 17th century for describing his law of falling bodies. The curious property he noted happens to be exactly what is needed to quantify his observation that the acceleration of falling bodies is uniform. Among the generalizations and extensions later given are iterated Galileo sequences. We show that...