Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Pinpointing the desert of the Ruoqiang County, Western China   A man-made texture on the desert soil of a county of the Western China is
visible in satellite images, more than 8 kilometers long and 50 meters wide.
This seems to be the result of a detailed geophysical survey of the region that
led to the discovery of a large nickel ore. Therefore, the analysis of the
satellite imagery, performed to find such textures created by the sampling of
soils, can help anticipating information on the economical potentialities of a
site.

15
The categories of this paper are: nucl-ex
14
The categories of this paper are: math-ph
0
The categories of this paper are: hep-ph
21
The categories of this paper are: adap-org
4
The categories of this paper are: cond-mat
18
The categories of this paper are: econ
30
The categories of this paper are: q-alg
13
The categories of this paper are: quant-ph
35
The categories of this paper are: mtrl-th
26
The categories of this paper are: bayes-an
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The categories of this paper are: stat
23
The categories of this paper are: solv-int
22
The categories of this paper are: chao-dyn
5
The categories of this paper are: gr-qc
32
The categories of this paper are: atom-ph
12
The categories of this paper are: nucl-th