<?xml version="1.0"?> 
<sdf version="1.4">
  <world name="default">
    <model name="heightmap">
      <static>true</static>
      <link name="link">
        <collision name="collision">
          <geometry>
            <heightmap>
              <uri>file://media/materials/textures/not_square.png</uri>
              <size>129 129 10</size>
            </heightmap>
          </geometry>
        </collision>
      </link>
    </model>
  </world>
</sdf>
