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[1] The International Terrestrial Reference Frame (ITRF) is a fundamental datum for high‐precision orbit tracking, navigation, and global change monitoring. Accurately realizing and maintaining ITRF origin at the mean Earth system center of mass (CM) is critical to surface and spacecraft based geodetic measurements including those of sea level rise and its(More)
—Multiple leaf area index (LAI) products have been generated from remote-sensing data. Among them, the Moderate-Resolution Imaging Spectroradiometer (MODIS) LAI product (MOD15A2) is now routinely derived from data acquired by MODIS sensors onboard Terra and Aqua satellite platforms. However, the MODIS LAI product is not spatially and temporally continuous(More)
  • Sub-commission, X. Collilieux, +13 authors X. Wu
  • 2013
Ideally, the origin of the Terrestrial Reference Frame (TRF) is defined as the center of mass of the whole Earth system, the time evolution of its orientation is such that no global net rotation of the whole Earth's surface is possible and the TRF scale is specified through the adoption of some physical constants and timescale. These parameters need to be(More)
[1] SLR network translations estimated between a quasi-instantaneous station position set, theoretically expressed with respect to the center of mass of the Earth (CM), and a secular reference frame are the signature of the motion of the CM with respect to the Earth crust. Geocenter motion is defined here to be the motion of the CM with respect to the(More)
Leaf area index (LAI) is an important vegetation biophysical variable, and has been widely applied to estimation of crop yield, evapotranspiration, and net photosynthesis. Currently, there are many methods to estimate LAI from remote sensing data through the statistical relationship between LAI and spectral vegetation indices, physical model inversion or(More)
Leaf area index (LAI) is an important parameter in canopy interception, evapotranspiration, and net photosynthesis. Satellite remote sensing enables derivation of LAI globally at desired spatial resolution and temporal frequency. And several LAI products have been produced from data acquired by Moderate Resolution Imaging Spectroradiometer (MODIS),(More)
In this study, we proposed three optimized models for calculating the total volume of landslides triggered by the 2008 Wenchuan, China Mw 7.9 earthquake. First, we calculated the volume of each deposit of 1,415 landslides triggered by the quake based on pre- and post-quake DEMs in 20 m resolution. The samples were used to fit the conventional landslide(More)
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