Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Moving sand dunes   In several desert areas, the slow motion of sand dunes can be a challenge for
modern human activities and a threat for the survival of ancient places or
archaeological sites. However, several methods exist for surveying the dune
fields and estimate their migration rate. Among these methods, the use of
satellite images, in particular of those freely available on the World Wide
Web, is a convenient resource for the planning of future human settlements and
activities.

9
The categories of this paper are: nlin
5
The categories of this paper are: gr-qc
13
The categories of this paper are: quant-ph
37
The categories of this paper are: supr-con
21
The categories of this paper are: adap-org
8
The categories of this paper are: hep-ex
31
The categories of this paper are: ao-sci
32
The categories of this paper are: atom-ph
0
The categories of this paper are: hep-ph
15
The categories of this paper are: nucl-ex
6
The categories of this paper are: astro-ph
27
The categories of this paper are: comp-gas
16
The categories of this paper are: stat
24
The categories of this paper are: dg-ga
30
The categories of this paper are: q-alg
26
The categories of this paper are: bayes-an