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GPM Ground Validation Dual-frequency Dual-polarized Doppler Radar (D3R) Table of Contents
The GPM Ground Validation Dual-frequency Dual-polarized Doppler Radar (D3R) GCPEx and IFloodS data sets contain radar reflectivity and doppler velocity measurements. The D3R was developed by a government-industry-academic consortium with funding from NASA's Global Precipitation Measurement (GPM) Project. It operates at the ku (13.91 GHz ± 25 MHz) and ku (35.56 GHz ± 25 MHz) frequencies covering a fixed range from 450 m to 39.75 km. The D3R was first deployed in the Mid-Latitude Continental Convective Clouds Experiment (MC3E) field campaign during April and May of 2011. The instrument's data is available in .nc netCDF file format. The following example shows how to cite the use of this data set in a publication. For more information, please see our Citing GHRC DAAC and Data page. Chandrasekar, V. GPM Ground Validation Dual-frequency Dual-polarized Doppler Radar (D3R) GCPEx [indicate subset used]. Data set available online [http://ghrc.nsstc.nasa.gov/] from the NASA EOSDIS Global Hydrology Resource Center Distributed Active Archive Center Huntsville, Alabama, U.S.A. doi: 10.5067/GPMGV/GCPEX/D3R/DATA101 Chandrasekar, V. GPM Ground Validation Dual-frequency Dual-polarized Doppler Radar (D3R) IFloodS [indicate subset used]. Data set available online [http://ghrc.nsstc.nasa.gov/] from the NASA EOSDIS Global Hydrology Resource Center Distributed Active Archive Center Huntsville, Alabama, U.S.A. doi: 10.5067/GPMGV/IFLOODS/D3R/DATA101 The GPM Cold-season Precipitation Experiment (GCPEx) occurred in Ontario, Canada during the winter season of 2011-2012. GCPEx addressed shortcomings in the GPM snowfall retrieval algorithm by collecting microphysical properties, associated remote sensing observations, and coordinated model simulations of precipitating snow. These data sets were collected to aid in the achievement of the over arching goal of GCPEx which is to characterize the ability of multi-frequency active and passive microwave sensors to detect and estimate falling snow. During GCPEx, the Dual-frequency Dual-polarized Doppler Radar was located at the CARE site in Ontario, Canada. The coordinates of the d3r's location are: Lat: 44°13'57.4"N, Lon: 79°46'54.1"W. Data was collected from January 13, 2012 to February 29, 2012. Further details on GCPEx are available at http://gpm.nsstc.nasa.gov/gcpex. The Iowa Flood Studies (IFloodS) campaign was a ground measurement campaign that took place in eastern Iowa from May 1 to June 15, 2013. The goals of the campaign were to collect detailed measurements of precipitation at the Earth's surface using ground instruments and advanced weather radars and, simultaneously, collect data from satellites passing overhead. The ground instruments characterized precipitation -- the size and shape of raindrops, the physics of ice and liquid particles throughout the cloud and below as it falls, temperature, air moisture, and distribution of different size droplets -- to improve rainfall estimates from the satellites, and in particular the algorithms that interpret raw data for the upcoming Global Precipitation Measurement (GPM) mission's Core Observatory satellite, which launches in 2014. During IFloodS, the Dual-frequency Dual-polarized Doppler Radar was located near Traer, Iowa (Lat: 42°16'5.0"N, Lon: -92°30'34.0"W). Data was collected from May 9, 2013 to June 13, 2013. Further details on the IFloodS campaign are available at http://gpm.nsstc.nasa.gov/ifloods. Additional information about the Iowa Flood Center can be found at http://iowafloodcenter.org. The Dual-frequency Dual-polarized Doppler Radar (D3R), developed with funding from NASA's Global Precipitation Measurement (GPM) Project, is a fully polarimetric, scanning weather radar system which provides estimations of hydrometeor classification and drop size distribution retrievals. The first generation D3R design comprises of two separate co- aligned single-frequency antenna units mounted on a common pedestal with a dual-frequency dual-polarized solid- state transmitter. The D3R operates at the ku (13.91 GHz ± 25 MHz) and ka (35.56 GHz ± 25 MHz) frequencies covering a fixed range from 450 m to 39.75 km. These frequencies where selected for close compatibility with the GPM Dual-frequency Precipitation Radar (DPR) instrument onboard the GPM Core Observatory satellite. More detailed information on the Dual-frequency Dual-polarized Doppler Radar is available at http://ghrc.nsstc.nasa.gov/uso/ds_docs/gpmgv/d3r/PMM_D3R.pdf, http://ghrc.nsstc.nasa.gov/uso/ds_docs/gpmgv/d3r/Chandra_D3R_igarss_2010.pdf, and http://ghrc.nsstc.nasa.gov/uso/ds_docs/gpmgv/d3r/Vega_D3R_igarss_2010.pdf. The requirements document for Mobile Ka-/Ku-band Radar is available at http://ghrc.nsstc.nasa.gov/uso/ds_docs/gpmgv/d3r/GVS_KaKu_Radar_dex.pdf. V. Chandrasekar Rob Beauchamp The GPM Ground Validation Dual-frequency Dual-polarized Doppler Radar (D3R) GCPEx data set consists of .nc netCDF files. The files are named with the following convention: gcpex_d3r_ku_YYYYMMDD_HHMMSS_##.nc where,
The GPM Ground Validation Dual-frequency Dual-polarized Doppler Radar (D3R) IFloodS data set consists of .nc netCDF files. The files are named with the following convention: ifloods_d3r_ku_YYYYMMDD_HHMMSS_##.nc where,
These files contain radar reflectivity and Doppler velocity measurements throughout the study period. The GPM Ground Validation Dual-frequency Dual-polarized Doppler Radar (D3R) GCPEx and IFloodS data sets are available in netCDF format. Chandrasekar, V., Schwaller, Mathew R., Vega, Manuel, Carswell, James R., Mishra, Kumar Vijay, Meneghini, Robert and Nguyen, Cuong . "Scientific and engineering overview of the NASA Dual-Frequency Dual-Polarized Doppler Radar (D3R) system for GPM Ground Validation." Paper presented at the meeting of the IGARSS, 2010. doi: 10.1109/IGARSS.2010.5649440 Vega, Manuel, Carswell, James R., Chandrasekar, V., Schwaller, Mathew R. and Mishra, Kumar Vijay. "Realization of the NASA Dual-Frequency Dual-Polarized Doppler Radar (D3R)." Paper presented at the meeting of the IGARSS, 2010. doi: 10.1109/IGARSS.2010.5653929 To order these data or for further information, please contact:
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