GRASS Tutorial for nviz

# NVIZ Reference Manual

CONTENTS

## Position Panel

The Position panel lets you manually control the From (eye) position and the To (surface) position. You can manually enter coordinates or calculate coordinates based upon a range, bearing, and elevation.

### OPTIONS

From (eye)
  Enter coordinates in GRASS database units for the From (eye) position.
  East
    Enter the easting of the eye position.
  North
    Enter the northing of the eye position.
  Ht
    Enter the height (elevation) of the eye position.
To (surface)
  Enter coordinates in GRASS database units for the To (surface) position.
  East
    Enter the easting of the surface position.
  North
    Enter the northing of the surface position.
  Ht
    Enter the height (elevation) of the surface position.
Range/Bearing
  Calculates either a new From or To position based upon a Range, Bearing, and Elevation.
  Range
    Enter the range (distance) between the eye and surface positions.
  Bearing
    Enter the bearing (in degrees) between the eye and surface positions.
  Elev
    Enter the elevation (in degrees) between the eye and surface positions.
Eye to Surface
  Uses the Range, Bearing, and Elevation values to calculate a new To position. The From position remains unchanged.
  NOTE: Use this option with caution, because it is possible to move the surface completely out of view.
Surface to Eye
  Uses the Range, Bearing, and Elevation values to calculate a new From position. The To position remains unchanged.
Apply
  Calculates either the new From or To position (depending on the selected option) and updates coordinates accordingly.
Refresh
  Gets the current From and To positions from the Movement panel.
Apply
  Applies the edited From and To positions to the current view. The Movement panel updates to the new position.
Close
  Closes the Position panel.