Navigation

When you start a project in Field-Map Data Collector and you open a plot, your position is set to the origin of co-ordinates (plot in local co-ordinates) or to the middle of the plot (plot in

global co-ordinates). You will see a thin dark blue cross (origin) superimposed by a thin dark blue square with a center point (your position). Before you start navigating to the “to point” be sure you are standing in the “from point”.


Precision

You can increase the precision by increasing the number of measurements (see Settings).


Tracking line

The tracking line that shows measurement during navigation is displayed in the map. The tracking line can be stored in a line layer when the navigation is finished.


Understanding clockwise navigation

Because it is difficult for the assistant to estimate the azimuth without a compass, Field-Map uses clockwise orientation. A schematic picture of how this works is given below.



Position of the equipment from your assistant’s point of view is always at 12:00. Therefore if you tell the assistant to walk in the direction of 6:00 he/she should continue in his/her original direction.


Angle encoder

When accepting new position with angle encoder it is necessary doing backward measurement to establish correct bearing.

Method A

  1. Blue square with the center point indicates your position (“from point”)
  2. Double click the layer (containing “to point”) to make it active
  3. Select the point to which you want to navigate (“to point”)
  4. Click the Use laser for mapping button
  5. Click the Traverse to selected point button



  1. A new window appears on the right showing distance and direction to the target (“to point”)

Send the field assistant with the main pole towards the target (“to point”)

After she/he gets as far as she/he can, but still not out of your sight, aim at the reflector on the range pole using the laser and send data to the computer



  1. The blue cross on the map moves to the position of the assistant
  2. Click the Accept button to accept the measured position



  1. Square (your position) moves to the position of cross (range pole) on the map

You would now walk with the equipment to the position of range pole or to the new position further, closer to the target point

When you stand in the correct position, let the assistant walk again towards the “to point”



  1. Click the Next button to measure next point

You would now aim at the reflector again



  1. After accepting the point you would again move to the position of the range pole



  1. When the New position values indicate that the target (“to point”) is sufficiently close to the range pole (within centimeters), you can move to the position of range pole and estimate the position of the “to point” according to values displayed in the navigation window



  1. Click the Close button to exit Navigation



Method B


  1. Click the Position button and walk with equipment around position of range pole to the new position closer to the target point
  2. Take measurement backwards to the range pole, click Next button. Send the field assistant with the main pole towards the target (“to point”)
  3. Take measurement forwards to the range pole, click Accept button
  4. Repeat steps 2 to 3 to reach the target point