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  <title>Radar Data Availability Figures</title>
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  <h1>Radar Data Availability Figures</h1>

  <p>
    These are some useful figures showing airborne radar sounder data availability and survey density for
    the Antarctic and Greenland ice sheets, using data from
    <a href="https://github.com/englacial/xopr">xOPR</a> and BedMap catalogs, supplemented with
    flight tracks published directly by AWI and the KOPRI/UTIG helicopter surveys.
    Generated automatically on each push to <code>main</code>.
  </p>

  <p>For more details on the data density maps, see this <a href="https://englacial.org/posts/20260331-radar-sounder-density/">blog post</a>.</p>

  <p>See the code to generate these figures on <a href="https://github.com/englacial/radar-data-availability">GitHub</a>.</p>

  <h2>Combined Data Availability</h2>
  <figure>
    <img src="combined_data_availability.png" alt="Combined data availability">
    <figcaption>Combined BedMap + xOPR data availability by year, using some loose heuristics for combining the two catalogs.</figcaption>
  </figure>
  <pre><code>uv run python plot_combined_availability.py</code></pre>

  <h2>Antarctic Airborne Radar Surveying by Country</h2>
  <figure>
    <img src="bedmap_data_availability.png" alt="Antarctic airborne radar line-km per year by country">
    <figcaption>Line-km of Antarctic airborne radar sounding per year, stacked by the country of the collecting institution. BedMap campaigns are spread over their catalog date range; the AWI, KOPRI and xOPR-sourced tracks are placed in their field season.</figcaption>
  </figure>
  <pre><code>uv run python plot_bedmap_availability.py</code></pre>

  <h2>Survey Density: BedMap Antarctica</h2>
  <figure>
    <img src="survey_density_bedmap_antarctica.png" alt="BedMap Antarctica survey density">
    <figcaption>Survey density from BedMap 1, 2, and 3(Antarctica)</figcaption>
  </figure>
  <pre><code>uv run python plot_survey_density.py --source bedmap_local --region antarctica</code></pre>

  <h2>Survey Density: BedMap Antarctica (Amundsen Sea Embayment)</h2>
  <figure>
    <img src="survey_density_bedmap_antarctica_ase.png" alt="BedMap ASE survey density">
    <figcaption>Same density map as above, zoomed to the Amundsen Sea Embayment</figcaption>
  </figure>
  <pre><code>uv run python plot_survey_density.py --source bedmap_local --region antarctica --zoom ase</code></pre>

  <h2>Survey Density: xOPR Greenland</h2>
  <figure>
    <img src="survey_density_xopr_greenland.png" alt="xOPR Greenland survey density">
    <figcaption>Survey density from radar sounder data available through xOPR (Greenland)</figcaption>
  </figure>
  <pre><code>uv run python plot_survey_density.py --source xopr --region greenland</code></pre>

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