This is a retouched picture , which means that it has been digitally altered from its original version. Modifications: colour balance, saturation . The original can be viewed here: Survey instruments.png : .

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This image is a derivative work of the following images:

• File:Survey_instruments.png licensed with PD-self
  • 2006-11-01T21:12:07Z Mididoctors 2592x1944 (7924921 Bytes) {{Information |Description=survey gear |Source=own work |Date=2006111 |Author=me |Permission=public |other_versions=none }}

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