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    <title>Alejandro Fontal · Blog</title>
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    <description>Research notes, coding experiments, and long-form technical posts.</description>
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      <title>Grammar of graphics for SQL? Trying GGSQL</title>
      <link>https://alfontal.dev/posts/ggsql-jp-idwr-db/ggsql_jp_idwr_db/</link>
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      <pubDate>Mon, 12 Oct 2026 00:00:00 GMT</pubDate>
      <description>Querying, analyzing and plotting Japanese infectious surveillance data with nothing but SQL</description>
      <category>Data Visualization</category>
      <category>SQL</category>
      <category>ggsql</category>
      <category>DuckDB</category>
      <category>Epidemiology</category>
      <category>Japan</category>
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      <title>Mapping world population density</title>
      <link>https://alfontal.dev/posts/world-population/world_pop_densities/</link>
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      <pubDate>Tue, 04 Nov 2025 00:00:00 GMT</pubDate>
      <description>Global population density maps built with xarray and plotnine.</description>
      <category>Data Visualization</category>
      <category>Python</category>
      <category>GIS</category>
      <category>plotnine</category>
      <category>xarray</category>
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      <title>Vegetation, land use and Google's Earth Engine API</title>
      <link>https://alfontal.dev/posts/vegetation-land-use/land_use/</link>
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      <pubDate>Tue, 16 May 2023 00:00:00 GMT</pubDate>
      <description>Exploring vegetation and land-use patterns across Asia with Google Earth Engine.</description>
      <category>Remote Sensing</category>
      <category>Earth Engine</category>
      <category>GIS</category>
      <category>Land Use</category>
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      <title>Tracing Tokyo's air sources to identify Kawasaki Disease's etiological triggers</title>
      <link>https://alfontal.dev/posts/kd-tokyo-air-sources/kd_tokyo_air_sources/</link>
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      <pubDate>Sun, 03 Apr 2022 00:00:00 GMT</pubDate>
      <description>Conference report on Kawasaki disease incidence in Tokyo and differential HYSPLIT back-trajectory source regions.</description>
      <category>Kawasaki Disease</category>
      <category>Epidemiology</category>
      <category>Atmospheric Transport</category>
      <category>HYSPLIT</category>
      <category>Python</category>
      <category>Reproducibility</category>
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