Evolving the Geodetic Infrastructure to Meet New Scientific Needs (2020) / Chapter Skim
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7 Ecosystems
7 Ecosystems
Pages 71-82
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From page 71... ...
. questions which use active remote sensing and thus rely Previous studies have demonstrated the efficacy of on the geodetic infrastructure are: lidar and radar for quantifying forest and aquatic bio mass (Liu et al., 2015; Du et al., 2017)
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FIGURE 7.1 Forest height map obtained by inverting P-band Pol-InSAR data from Pongara National Park, Gabon. Color ramp represents forest height with much of the area covered by mangroves.
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, Determining water vapor from GNSS-derived a 10-m global digital elevation model (DEM) is neces- total column water vapor and additional radio occultasary to understand vegetation dynamics.
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Measurexample, mangroves are highly productive ecosystems ing rates of landscape change and lateral processes, as that provide carbon storage as well as discharge terres- well as the processes that drive changes, require mm- to trial carbon to the ocean (Alongi, 2014)
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PALSAR-2 (L-band SAR) cycles are compared to the Cyclone Global Navigation Satellite System (CYGNSS)
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would reduce the mapping time to about 4 years, which is still inadequate to resolve Geodetic Needs many landscape processes. Given these constraints, the best way to obtain the necessary time series may be to Lateral transport studies require maintenance of acquire a global, baseline high-resolution topographic the current geodetic infrastructure.
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. SAR requires enables global soil moisture measurements to be down- the current geodetic infrastructure to be able to scaled (Abbaszadeh et al., 2019)
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Repeat lidar surveys with precise relocation will be useful for studies of permafrost and freeze/thaw over time are necessary to capture permafrost thaw dynamics, such as noted in Rowland (2010)
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. InSAR measurements of the freeze-thaw cycles in Geodetic Needs Tibet require relative orbital accuracies of better than 20–40 mm to recover the 10 mm annual signals (Daout Airborne lidar, InSAR, and GNSS-IR measureet al., 2017)
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Sustained gravity measurements are also a priority. Related Improvements to the Geodetic New geodetic needs to help answer the ecosys- Infrastructure to Enhance Scientific Returns tem science questions in the Decadal Survey include increasing the number of GNSS stations across envi- • Additional GNSS stations (or in situ GNSS-IR)
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Remote ric synthetic aperture radar signals on Alaska glaciers: A cold Sensing 10(6)
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2018. Global soil organic carbon removal by water Selected Topics in Applied Earth Observations and Remote erosion under climate change and land use change during AD Sensing 7(5)
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