Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Satellite reveals age and extent of oil palm plantations in Southeast
  Asia   In recent decades, global oil palm production has shown an abrupt increase,
with almost 90% produced in Southeast Asia alone. Monitoring oil palm is
largely based on national surveys and inventories or one-off mapping studies.
However, they do not provide detailed spatial extent or timely updates and
trends in oil palm expansion or age. Palm oil yields vary significantly with
plantation age, which is critical for landscape-level planning. Here we show
the extent and age of oil palm plantations for the year 2017 across Southeast
Asia using remote sensing. Satellites reveal a total of 11.66 (+/- 2.10)
million hectares (Mha) of plantations with more than 45% located in Sumatra.
Plantation age varies from ~7 years in Kalimantan to ~13 in Insular Malaysia.
More than half the plantations on Kalimantan are young (<7 years) and not yet
in full production compared to Insular Malaysia where 45% of plantations are
older than 15 years, with declining yields. For the first time, these results
provide a consistent, independent, and transparent record of oil palm
plantation extent and age structure, which are complementary to national
statistics.

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The categories of this paper are: atom-ph
12
The categories of this paper are: nucl-th
5
The categories of this paper are: gr-qc
6
The categories of this paper are: astro-ph
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The categories of this paper are: chem-ph
14
The categories of this paper are: math-ph
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The categories of this paper are: supr-con
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The categories of this paper are: mtrl-th
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The categories of this paper are: alg-geom
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The categories of this paper are: dg-ga
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The categories of this paper are: comp-gas
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The categories of this paper are: cmp-lg
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The categories of this paper are: hep-ex
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The categories of this paper are: stat
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The categories of this paper are: ao-sci
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The categories of this paper are: hep-lat