ESA’s SMOS satellite has clocked up more than one billion kilometres orbiting Earth to improve our understanding of our planet’s water cycle. Marking its fifth birthday, all the data collected over land and ocean have been drawn together to show how moisture in the soil and salinity in t…
Measurements from ESA’s CryoSat mission have been used to map the height of the huge ice sheets that blanket Greenland and Antarctica and show how they are changing. New results reveal combined ice volume loss at an unprecedented rate of 500 cubic kilometres a year.
The Japan Aerospace Exploration Agency (JAXA) acquired images from the Phased Array Type L-band Aperture Rader-2 (PALSAR-2)* aboard the Advanced Land Observing Satellite-2 “DAICHI-2” (ALOS-2) as shown in the following attachment. The DAICHI-2 was launched on May 24, 2014, and it is currently under initial functional verification. The images were captured during the verification stage.
The DAICHI-2's observation data is expected to contribute to understanding damages from a disaster, monitoring deforestation, and sea ice observation in the Sea of Okhotsk and Arctic area.
Daichi-2 (ALOS-2) is a radar imaging spacecraft which will be operated by the Japan Aerospace Exploration Agency (JAXA). Bound for sun-synchronous orbit, it is expected to be used for land and resource studies, disaster monitoring and environmental research.
The ALOS-2 mission follows on from the original ALOS, which was launched in 2006 and operated for five years until mid-May 2011. Unlike its predecessor, which carried both optical and radar imagery payloads, Daichi-2 will be used only for radar imaging.
An ALOS-3 spacecraft, which would have carried a suite of optical instruments, was proposed for a 2015 or 2016 launch, however the mission has not been funded.
Although the first ALOS mission operated for five years, exceeding both its three-year design life and the planned two-year extension to its mission, its primary optical imager was found to be defective and many of the images it produced were of lower quality than had been expected.
ALOS-2 is a 2,120 kilogram (4,670 lb) spacecraft, which is designed for five years of operation although JAXA hope to be able to extend this to seven years. The satellite is equipped with a pair of solar arrays, capable of generating at least 5.2 kilowatts of power – more earlier in the mission.
Two antennae will be used to return data to Earth; an X-band antenna for direct communications and a Ka-band transceiver which will relay data via the Kodama Data Relay Test Satellite, which was launched in 2002.
From climate change monitoring to supporting humanitarian aid and crisis situations, early data applications from the month-old Sentinel-1A satellite show how the radar mission’s critical observations can be used to keep us and our planet safe.
The launch of the first Sentinel-1 satellite marks a new paradigm in Earth observation focusing on operational missions to support users for decades to come. This first satellite for Europe’s environmental monitoring Copernicus programme carries an advanced radar to image E…
El hielo que se forma sobre los lagos del norte de Alaska durante los meses de invierno está disminuyendo. El estudio de veinte años de imágenes radar tomadas desde el espacio revelan los efectos del cambio climático sobre los ecosistemas a altas latitudes.
Un nuevo mapa en alta resolución que muestra la situación actual de los bosques en el mundo ha sido creado con la ayuda de Google Earth. La herramienta interactiva publicada en internet es de acceso público y se destaca la capacidad de hacer foco en detalles locales con un alto nivel de precisión, una resolución de 30 metros.
El mapa traza la historia de los follajes de árboles a nivel mundial desde el año 2000 hasta el 2012, basado en 650.000 imagenes satelitales obtenidas por el Landsat 7. En este tiempo, la Tierra perdió un total de masa forestal del tamaño de Mongolia, tantos árboles como para cubrir seis veces un país como Reino Unido.
El progreso de Brasil en la reducción de la deforestación fue opacado por las pérdidas en Indonesia, Malasia, Paraguay, Bolivia, Zambia y Angola, según un estudio que publica la revista Science. “Este es el primer mapa del cambio forestal que es consistente globalmente y relevante a nivel local”, dice Matthew Hansen, de la Universidad de Maryland, quien dirigió el proyecto que elaboró el mapa. (MundoGEO.com)
The failure of the Scan Line Corrector (SLC) of the Landsat ETM+ (Enhanced Thematic Mapper Plus) instrument in 2003 had resulted in missing values for 22% of each scene. As the remaining pixels were of high quality, several procedures had been developed to fill the gaps and increase the usability of the SLC-off images. In this letter, a methodology is presented to assess the error when estimating quantitative parameters from gap-filled Landsat 7 images. The error from the gap-filling procedure was estimated using an external reference image. The methodology was applied in a Mediterranean river basin using two types of gap-filling methods and the error was estimated for leaf area index (LAI), actual evapotranspiration (ETa) and soil moisture in the rootzone (SMrz), three remotely sensed products which are commonly used in hydrological studies. The results suggest that the interpolation method had lower errors in all examined products. The proposed methodology is an imperative step that each user of gap-filled products could use to estimate the associated error before using the maps.
"China launched a Long March rocket last week with a satellite Western analysts believe will conduct all-weather global radar surveillance for the Chinese military.
"The Long March 2C rocket lifted off at 1853 GMT (1:53 p.m. EST) Friday from the Taiyuan launch base in northern China's Shanxi province. Launch occurred at 2:53 a.m. Beijing time Saturday, according to the official Xinhua news agency.
"The Yaogan 23 spacecraft carried on top of the two-stage Long March 2C booster is flying more than 300 miles [483 km] above Earth in an orbit over the poles tilted 97.3 degrees to the equator, according to tracking data acquired by the U.S. Air Force's Space Surveillance Network.
"China did not announce the launch in advance, keeping with the country's usual policy of not disclosing the launch schedule for military satellites.
Lecture on SAR polarimetry by E. Pottier from France’s University of Rennes.This presentation is from the second day of the advanced Land Training Course held at Spain’s University of Valencia 8–12 September 2014. As part of the Scientific Exploitation of Operational Missio…
Launched on 3 April, ESA’s Sentinel-1A satellite has already delivered its first radar images of Earth. They offer a tantalising glimpse of the kind of operational imagery that this new mission will provide for Europe’s ambitious Copernicus environmental monitoring programme.
The UN has announced that March 21 be recognized as the International Day of Forests. In tandem with the celebration of forests worldwide, is an awareness that we are still losing forests and trees much faster than they can regrow.
Many people are working to reverse tree cover loss in the world’s largest remaining forests. But several hugely important deforestation hotspots are still flying under the radar. These forest areas are seeing alarming trends and/or have lost much of their tree cover. We are using the latest data from Global Forest Watch, an online forest monitoring and alert system, to dive deeper into some under-reported deforestation hotspots.
This video showcases a selection of the first videos taken from SkySat-1, the first of a planned 24 satellite constellation. The video clips have not yet been calibrated or tuned. SkySat-1 captures up to 90-second video clips at 30 frames per second. The resolution is high enough to resolve objects that impact the global economy like shipping containers, while maintaining a level of clarity that does not determine human activity.
SkySat-1 also captures some of the highest quality color imagery of any commercial satellite and is capable of sub-meter native color and near-infrared imagery. The most revolutionary fact is that SkySat-1 was built and launched for more than an order of magnitude lower cost than traditional sub-meter imaging satellites.
SkySat-1 was launched on November 21, 2013 aboard a Dnepr rocket into a 600 kilometer sun-synchronous orbit.
La beca permite a los futuros líderes pasar un año en Alemania trabajando en un proyecto relacionado con la investigación de su elección en el campo de la protección del clima. Los becarios tienen la libertad de elegir a la universidad o centro de investigación.
La fecha límite para las solicitudes es el 15 de marzo de 2014. La beca se iniciará el 1 de marzo de 2015. Para obtener información detallada, por favor visite: www.humboldt-foundation.de/ICF.
The standard Landsat 8 products provided by the USGS EROS Center consist of quantized and calibrated scaled Digital Numbers (DN) representing multispectral image data acquired by both the Operational Land Imager (OLI) and Thermal Infrared Sensor (TIRS).
The products are delivered in 16-bit unsigned integer format and can be rescaled to the Top Of Atmosphere (TOA) reflectance and/or radiance using radiometric rescaling coefficients provided in the product metadata file (MTL file), as briefly described below. The MTL file also contains the thermal constants needed to convert TIRS data to the at-satellite brightness temperature. Further details can be found in the LDCM Cal/Val Algorithm Description Document and the Landsat 8 Science Users’ Handbook available from the Landsat website.
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