Difference between revisions of "New site and tripod setup description"

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<table>
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<table border="1">
 
<tr>
 
<tr>
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   <td>pre-existing site</td>
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   <td>&nbsp;</td>
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   <td>new site</td>
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  <td>'''pre-existing site'''</td>
 +
   <td>'''new site'''</td>
 
</tr>
 
</tr>
  
 
<tr>
 
<tr>
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  <td>'''1.'''</td>
 
   <td>extend tripod legs equally to chest height.</td>
 
   <td>extend tripod legs equally to chest height.</td>
 
   <td>same.</td>
 
   <td>same.</td>
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<tr>
 
<tr>
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  <td>'''2.'''</td>
 
   <td>adjust tribrach knobs to reference line.</td>
 
   <td>adjust tribrach knobs to reference line.</td>
 
   <td>same.</td>
 
   <td>same.</td>
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<tr>
 
<tr>
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  <td>'''3.'''</td>
 
   <td>fasten tribrach onto middle of the tripod head.</td>
 
   <td>fasten tribrach onto middle of the tripod head.</td>
 
   <td>place entrire tribrach/optical plumb on tripod.</td>
 
   <td>place entrire tribrach/optical plumb on tripod.</td>
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<tr>
 
<tr>
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  <td>'''4.'''</td>
 
   <td>use tribrach to position tripod correctly over marker by satisfying the following 3 conditions:<br/>
 
   <td>use tribrach to position tripod correctly over marker by satisfying the following 3 conditions:<br/>
 
       1. bulls eye level bubble is level<br/>
 
       1. bulls eye level bubble is level<br/>
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<tr>
 
<tr>
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  <td>'''5.'''</td>
 
   <td>With leg clamp loose, stomp tripod feet firmly in soil (stabelize with rocks if necessary)</td>
 
   <td>With leg clamp loose, stomp tripod feet firmly in soil (stabelize with rocks if necessary)</td>
 
   <td>same.</td>
 
   <td>same.</td>
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<tr>
 
<tr>
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  <td>'''6.'''</td>
 
   <td>roughly level tribrach again by adjusting tripod leg length.</td>
 
   <td>roughly level tribrach again by adjusting tripod leg length.</td>
 
   <td>same.</td>
 
   <td>same.</td>
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<tr>
 
<tr>
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  <td>'''7.'''</td>
 
   <td>attach optical plumb to tribrach and focus 2 things:<br/>
 
   <td>attach optical plumb to tribrach and focus 2 things:<br/>
 
       1. focus large knob on marker<br/>
 
       1. focus large knob on marker<br/>
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   <td>same.</td>
 
   <td>same.</td>
 
</tr>
 
</tr>
 +
 +
  
 
</table>
 
</table>

Revision as of 21:01, 27 May 2008

  pre-existing site new site
1. extend tripod legs equally to chest height. same.
2. adjust tribrach knobs to reference line. same.
3. fasten tribrach onto middle of the tripod head. place entrire tribrach/optical plumb on tripod.
4. use tribrach to position tripod correctly over marker by satisfying the following 3 conditions:
     1. bulls eye level bubble is level

     2. you can look down through hollow screw and see marker

     3. all tripod feet are on ground.

 (Note: this is the most tricky, but if carefully done most rewarding step for everything that follows.)
spread tripod feet out @ 1 m separation and locate them so that tribrach is level.
5. With leg clamp loose, stomp tripod feet firmly in soil (stabelize with rocks if necessary) same.
6. roughly level tribrach again by adjusting tripod leg length. same.
7. attach optical plumb to tribrach and focus 2 things:
     1. focus large knob on marker

     2. focus small knob for black ring sign.

     both should be sharp and in focus.
same.
Retrieved from "http://www.gps.alaska.edu/internal/index.php?title=New_site_and_tripod_setup_description&oldid=545"