• Obtain the topographic data of the project site: CAD, GIS, etc.

• Obtain Ortho-photos of the project site (targa 32 bits)

• Determine your work area with a square frame.
  
  Example: if the actual work area is a terrain of 3000m by 2500m
  you will need to create a Frame of 3000 x 3000.
  
  The frame must be square even if your project only concerns a portion of the square.

• Determine the insertion point of your work area.
  
  The coordinates x,y of the lower left most point in the square ( this point is mark by a crosshair).
  
  Example: X: 239 209 Y: 5 207 478

• Determine the minimum and maximum elevation levels of the work area.
  
  Example: min. 167m - max. 270m

Topo Data

• Isolate the topographic information, e.g. copy/paste into a new file.

• Save this information as a contour line file (.dxf).

Ortho Data

• Aerial photographs must be ortho-rectified to properly superimpose them on the design plan and digital terrain model.

• Determine your work area with a square frame.

• Export this information as a Targa 32 bits.

  Note: While it is important that the image fits your terrain map frame, you can double the image resolution
  to yield better results, e.g., 2048x2048.

  Also, if you import an image that covers only a portion of your landscape or the image is bigger,
  it will be stretched to meet the terrain size.