<?xml version="1.0" encoding="UTF-8"?>

<CodeSystem xmlns="http://hl7.org/fhir">
  <id value="mars-landing-sites-cs"/>
  <text>
    <status value="generated"/><div xmlns="http://www.w3.org/1999/xhtml"><p class="res-header-id"><b>Generated Narrative: CodeSystem mars-landing-sites-cs</b></p><a name="mars-landing-sites-cs"> </a><a name="hcmars-landing-sites-cs"> </a><p><b>Properties</b></p><p><b>This code system defines the following properties for its concepts</b></p><table class="grid"><tr><td><b>Name</b></td><td><b>Code</b></td><td><b>URI</b></td><td><b>Type</b></td><td><b>Description</b></td></tr><tr><td>latitude</td><td>latitude</td><td>http://hl7.org/fhir/uv/aerospace/CodeSystem/mars-landing-sites-cs#latitude</td><td>decimal</td><td>Areographic latitude (degrees, -90 to +90)</td></tr><tr><td>longitude</td><td>longitude</td><td>http://hl7.org/fhir/uv/aerospace/CodeSystem/mars-landing-sites-cs#longitude</td><td>decimal</td><td>Areographic longitude (degrees, 0 to 360)</td></tr><tr><td>feature</td><td>feature</td><td>http://hl7.org/fhir/uv/aerospace/CodeSystem/mars-landing-sites-cs#feature</td><td>string</td><td>Primary topographic feature</td></tr></table><p><b>Concepts</b></p><p>This case-sensitive code system <code>http://hl7.org/fhir/uv/aerospace/CodeSystem/mars-landing-sites-cs</code> defines the following codes:</p><table class="codes"><tr><td style="white-space:nowrap"><b>Code</b></td><td><b>Display</b></td><td><b>Definition</b></td><td><b>latitude</b></td><td><b>longitude</b></td><td><b>feature</b></td></tr><tr><td style="white-space:nowrap">jezero<a name="mars-landing-sites-cs-jezero"> </a></td><td>Jezero Crater</td><td>Ancient lake-delta system at 18.4°N, 77.5°E, Perseverance rover site, high science value for sample return</td><td>18.4</td><td>77.5</td><td>Impact crater with river delta deposits</td></tr><tr><td style="white-space:nowrap">arcadia<a name="mars-landing-sites-cs-arcadia"> </a></td><td>Arcadia Planitia</td><td>Flat plain ~40°N, 203°E with subsurface ice, candidate SpaceX Starship zone for ISRU water access</td><td>40</td><td>203</td><td>Smooth lowland plain</td></tr><tr><td style="white-space:nowrap">gale<a name="mars-landing-sites-cs-gale"> </a></td><td>Gale Crater</td><td>Large crater at 5.4°S, 137.8°E with layered central mound (Mt. Sharp), Curiosity rover site</td><td>-5.4</td><td>137.8</td><td>Impact crater with central peak</td></tr><tr><td style="white-space:nowrap">elysium<a name="mars-landing-sites-cs-elysium"> </a></td><td>Elysium Planitia</td><td>Smooth equatorial plain at 4°N, 135°E, benign terrain, InSight lander site</td><td>4</td><td>135</td><td>Volcanic plain</td></tr><tr><td style="white-space:nowrap">hellas<a name="mars-landing-sites-cs-hellas"> </a></td><td>Hellas Planitia</td><td>Deepest basin on Mars at 42.4°S, 70.5°E (~7 km below datum), higher atmospheric pressure aids landing</td><td>-42.4</td><td>70.5</td><td>Massive impact basin</td></tr><tr><td style="white-space:nowrap">mawrth<a name="mars-landing-sites-cs-mawrth"> </a></td><td>Mawrth Vallis</td><td>Ancient river valley at 24°N, 341°E with phyllosilicate (clay) deposits, high habitability science interest</td><td>24</td><td>341</td><td>Outflow channel</td></tr></table></div>
  </text>
  <url value="http://hl7.org/fhir/uv/aerospace/CodeSystem/mars-landing-sites-cs"/>
  <version value="0.5.12"/>
  <name value="MarsLandingSitesCS"/>
  <title value="Mars Landing Sites (Candidate)"/>
  <status value="active"/>
  <experimental value="false"/>
  <date value="2026-03-25T00:24:16-05:00"/>
  <publisher value="MITRE"/>
  <contact>
    <name value="MITRE"/>
    <telecom>
      <system value="url"/>
      <value value="https://www.mitre.org/"/>
    </telecom>
  </contact>
  <description value="Candidate landing sites for human Mars missions with are&#xA;&#xA;ographic coordinates and site characteristics"/>
  <caseSensitive value="true"/>
  <content value="complete"/>
  <count value="6"/>
  <property>
    <code value="latitude"/>
    <uri value="http://hl7.org/fhir/uv/aerospace/CodeSystem/mars-landing-sites-cs#latitude"/>
    <description value="Areographic latitude (degrees, -90 to +90)"/>
    <type value="decimal"/>
  </property>
  <property>
    <code value="longitude"/>
    <uri value="http://hl7.org/fhir/uv/aerospace/CodeSystem/mars-landing-sites-cs#longitude"/>
    <description value="Areographic longitude (degrees, 0 to 360)"/>
    <type value="decimal"/>
  </property>
  <property>
    <code value="feature"/>
    <uri value="http://hl7.org/fhir/uv/aerospace/CodeSystem/mars-landing-sites-cs#feature"/>
    <description value="Primary topographic feature"/>
    <type value="string"/>
  </property>
  <concept>
    <code value="jezero"/>
    <display value="Jezero Crater"/>
    <definition value="Ancient lake-delta system at 18.4°N, 77.5°E, Perseverance rover site, high science value for sample return"/>
    <property>
      <code value="latitude"/>
      <valueDecimal value="18.4"/>
    </property>
    <property>
      <code value="longitude"/>
      <valueDecimal value="77.5"/>
    </property>
    <property>
      <code value="feature"/>
      <valueString value="Impact crater with river delta deposits"/>
    </property>
  </concept>
  <concept>
    <code value="arcadia"/>
    <display value="Arcadia Planitia"/>
    <definition value="Flat plain ~40°N, 203°E with subsurface ice, candidate SpaceX Starship zone for ISRU water access"/>
    <property>
      <code value="latitude"/>
      <valueDecimal value="40"/>
    </property>
    <property>
      <code value="longitude"/>
      <valueDecimal value="203"/>
    </property>
    <property>
      <code value="feature"/>
      <valueString value="Smooth lowland plain"/>
    </property>
  </concept>
  <concept>
    <code value="gale"/>
    <display value="Gale Crater"/>
    <definition value="Large crater at 5.4°S, 137.8°E with layered central mound (Mt. Sharp), Curiosity rover site"/>
    <property>
      <code value="latitude"/>
      <valueDecimal value="-5.4"/>
    </property>
    <property>
      <code value="longitude"/>
      <valueDecimal value="137.8"/>
    </property>
    <property>
      <code value="feature"/>
      <valueString value="Impact crater with central peak"/>
    </property>
  </concept>
  <concept>
    <code value="elysium"/>
    <display value="Elysium Planitia"/>
    <definition value="Smooth equatorial plain at 4°N, 135°E, benign terrain, InSight lander site"/>
    <property>
      <code value="latitude"/>
      <valueDecimal value="4"/>
    </property>
    <property>
      <code value="longitude"/>
      <valueDecimal value="135"/>
    </property>
    <property>
      <code value="feature"/>
      <valueString value="Volcanic plain"/>
    </property>
  </concept>
  <concept>
    <code value="hellas"/>
    <display value="Hellas Planitia"/>
    <definition value="Deepest basin on Mars at 42.4°S, 70.5°E (~7 km below datum), higher atmospheric pressure aids landing"/>
    <property>
      <code value="latitude"/>
      <valueDecimal value="-42.4"/>
    </property>
    <property>
      <code value="longitude"/>
      <valueDecimal value="70.5"/>
    </property>
    <property>
      <code value="feature"/>
      <valueString value="Massive impact basin"/>
    </property>
  </concept>
  <concept>
    <code value="mawrth"/>
    <display value="Mawrth Vallis"/>
    <definition value="Ancient river valley at 24°N, 341°E with phyllosilicate (clay) deposits, high habitability science interest"/>
    <property>
      <code value="latitude"/>
      <valueDecimal value="24"/>
    </property>
    <property>
      <code value="longitude"/>
      <valueDecimal value="341"/>
    </property>
    <property>
      <code value="feature"/>
      <valueString value="Outflow channel"/>
    </property>
  </concept>
</CodeSystem>