In most tutorial that involving LiDAR this resolution tag always set to 0.01 and even from sdformat.org the default value is 0 with explanation Linear resolution of each ray. I have tried to Google 'linear resolution' keyword and only irrelevant topic came out. When I try to change its value to huge number as:

  <range>
    <min>0.14</min>
    <max>6.0</max>
    <resolution>1</resolution>
  </range>

And there is no significant different of data produced. So what actually it is?