Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: GPM Ground Validation Basic Radar Products and Implications for
  Observation Strategies   Recommendations are made for NASA/JAXA Global Precipitation Measurement (GPM)
satellite Ground Validation (GV) program. This report details recommended GV
site local radar products based on data from surface-based scanning radars
including S-band, C-band, and X-band polarimetric and non-polarimetric radars.
Three general categories of products are described: text products summarizing
information on the statistical characteristics of the radar data and derived
parameters, 2D products providing maps of the horizontal variability of near
surface radar observed and derived parameters, and 3D products describing
volumetric echo structure. Regional composites could include products based on
several of the 2D and 3D single radar products. Several types of
time-integrated 2D and 3D products are also recommended. A brief discussion of
useful ancillary data from other sources and remaining challenges concludes the
report.

9
The categories of this paper are: nlin
35
The categories of this paper are: mtrl-th
33
The categories of this paper are: plasm-ph
16
The categories of this paper are: stat
36
The categories of this paper are: cmp-lg
4
The categories of this paper are: cond-mat
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The categories of this paper are: chao-dyn
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The categories of this paper are: adap-org
1
The categories of this paper are: cs
7
The categories of this paper are: hep-th
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The categories of this paper are: econ
34
The categories of this paper are: chem-ph
26
The categories of this paper are: bayes-an
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The categories of this paper are: nucl-ex
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The categories of this paper are: acc-phys
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The categories of this paper are: dg-ga