The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
The operational dual-baseline phase unwrapping algorithm for the TanDEM-X mission is based on a combination of separate single-baseline phase unwrapping and a correction procedure of different levels of complexity. It benefits from all the information available from the two TanDEM-X acquisitions by computing a differential interferogram to obtain a more reliable unwrapped phase. This may still be...
In this paper, we present some investigations based on X-band interferometric coherence for retrieving forest Growing Stock Volume (GSV). Exanimating first temporal decorrelation, a comparison indicated total (γ=0.1–0.2), (γ=0.1–0.4) and low (γ=0.4–0.9) temporal decorrelation for TSX (11 days repeat pass), CSK (1 day repeat pass) and TDX (single pass) respectively. After studying also the spatial...
We have developed a pulsed lidar technique for measuring the tropospheric CO2 concentrations as a candidate for NASA's planned ASCENDS space mission. We have developed an airborne lidar to demonstrate the measurements from aircraft. In 2010 and 2011we measured atmospheric CO2 and O2 column absorptions and line shapes on a series of flights at altitudes from 3–13 km.
(CoReH2O) satellite mission was selected for detailed scientific and technical studies within the Earth Explorer Programme of ESA. The sensor is a dual frequency SAR, operating at 17.2 GHz and 9.6 GHz, VV and VH polarizations The mission will deliver spatially distributed snow and ice observations to improve the representation of the croysphere in hydrological and climate models. Primary parameters...
The BIOMASS mission is designed to provide unique information on the biomass in the world's forests at spatial and temporal resolutions suitable for characterizing their dynamics and their contribution to carbon cycle estimates. To achieve this it combines biomass estimates from direct inversion of polarimetric backscattering coefficients with Pol-InSAR forest height estimates. The mission will also...
The BIOMASS mission is designed to map the full range of the world's above-ground forest biomass, for the needs of national scale inventory and global carbon flux calculations. This objective is achieved with advanced P-band SAR techniques. The P-band biomass measurement concept was based on previous work over the past two decades. During the preparatory phase, new campaigns have been conducted to...
The European Space Agency (ESA) is preparing candidates for the next Earth Explorer Core mission with the aim to select the 7th Earth Explorer mission to be launched towards the end of this decade. Earth Explorers are the backbone of the science and research element of ESA's Living Planet Programme, providing an important contribution to the global endeavor of understanding the Earth's system, particularly...
Small satellites flight experiments, using CubeSats, are growing rapidly as a low-cost and quick turn-around platform for education, focused science observations, and advanced technology validation. This talk will describe recent investments by NASA's Earth Science Technology Office (ESTO) to rapidly advance the TRL of various hardware and software technologies targeted for future Earth Science Decadal...
The Scarab-3 instrument, part of the Indian-French Megha-Tropiques mission [1], has been launched in october 2011. It is a radiometer dedicated to earth radiation budget. CNES is prime of the development of this instrument. Last year, CNES conducted the final integration of the instrument and the radiometric/geometric calibrations. Two main spectral bands are measured by this instrument: A shortwave...
Given the history of delays for NASA science instruments, a study was conducted to assess the viability of a new development paradigm called Instrument First, Spacecraft Second (IFSS) to reduce cost and schedule growth in future missions. The new paradigm was shown to provide many tangible benefits, including decreased portfolio costs and less portfolio volatility, but there were still questions as...
We consider a microwave scattering model of sea foam and whitecap designed for high-resolution (∼1–3m) radar and/or scatterometer observations of the ocean environment. The classical Mie theory is applied to compute scattering and absorption characteristics of a polydisperse system of bubbles - hollow spherical particles with a water shell. This system represents a foam model at microwave frequencies...
Polarimetric calibration is essential in order to achieve an accurate image interpretation and should be the first step to carry out once we get the full polarimetric data. Hence, a polarimetric calibration tool based on the algorithm proposed by Quegan has been developed and analyzed with data coming from TerraSAR-X and INTASAR RIX prototype. The final aim of this work is to obtain a ready to use...
Two layer water cloud model (WCM2), which is a refined version of the conventional water cloud model (WCM), considering the vertical inhomogeneity in the vegetation layer. The vertical inhomogeneity of the vegetation layer is described by the distribution of water content per unit volume. A piecewise linear function is used to describe the distrituion of water content per unit volume. We analyze the...
Second-order volumetric perturbative reciprocal theory (VPRT), which has a direct theoretical interest to scattering in random media including up to second-order effects, is presented. Expression for the scattering field are directly given in terms of meaningful reactions, i.e. involving physical observable quantities. Distribution theory for discontinuous test functions provides the rigorous mathematical...
This contribution proposes a methodological approach based on a coupled canopy-atmosphere radiative transfer model and a Bayesian optimization algorithm, which allows the use of a priori data in the retrieval. This approach was used to estimate LAI and leaf chlorophyll content (Cab) in the agricultural test site Oensingen, Switzerland, from at-sensor radiance data of the new airborne APEX imaging...
In this paper the principles of polarimetric Ultrawideband Radar are discussed. First an overview of the state of the art and the theory is given. The calibration principles of polarized UWB Radar data as well as possible imaging algorithms are discussed. Possible applications are listed and one example, to detect certain targets using a polarimetric MIMO UWB radar by performing an analysis of the...
Snow cloud distribution in the lower atmosphere was observed using two optical lidars (ceilometer) set up at the distance of 3.1 km. Visualization was constructed from two time series data measured by each lidar. The instruments additionally included weather station, to measure wind speed and direction, and snowfall gauge, to calculate precipitation rate. Combination of all these instruments with...
A method for detecting building unit density information from high resolution SAR images is proposed. Like most research works in urban analysis on high resolution SAR images, it detects buildings by extracting the bright layover and double bounce regions. But there are several differences between this work and other works. First, it pays more attention on the accuracy of building unit number than...
Real-time traffic information is important in terms of easing highway congestion, while map matching is the basis for calculating real-time traffic information. This paper starts with the three factors of currently used algorithms in floating car map matching, namely distance, speed-direction, and connectivity. From there, the paper gives analysis on the characteristics of highway network and the...
Compared with the traditional aerospace remote sensing platforms, The UAV was a new remote sensing platform, with the advantages of flexible, easy operation, high resolution and low-cost, which has been successfully applied to various field of the national economy. The manual extraction of buildings is an extremely labor-intensive, time-consuming work. So the automatic extraction of buildings elevation...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.