GENERAL                       

Project                       Van Diemen
Survey area                   NE Tasmania VanDiemen
Located data type             0.1 Second Final Data

Surveyed by                   GPX AIRBORNE PTY LTD.
Job number                    2272
Processed by                  GPX AIRBORNE PTY LTD.
Creation date                 June 2007

SURVEY SPECIFICATIONS         

Survey flown                  March - April 2007
Traverse line spacing         200 metres
Traverse line direction       090-270 degrees
Tie line spacing              2000 metres
Tie line direction            000-180 degrees

Survey height                 90 metres

LOCATED DATA FORMAT           

Variable                      Units          Undefined      From  To    Format    

Line number                                  9999999        1     8     I8        
Easting (MGA55)               metres         9999999.99     9     19    F11.2     
Northing (MGA55)              metres         9999999.99     20    30    F11.2     
Fiducial                                     99999.99       31    39    F9.2      
Flight number                                999            40    43    I4        
Direction (1=E, 2=N, 3=W, 4=S)               9              44    45    I2        
Date (YYYYMMDD)                              99999999       46    54    I9        
Time (GPS)                    seconds        99999.99       55    63    F9.2      
Longitude (GDA94)             degrees        999.999999     64    74    F11.6     
Latitude (GDA94)              degrees        999.999999     75    85    F11.6     
Radar altimeter               metres         9999.9         86    92    F7.1      
GPS altitude                  metres         9999.9         93    99    F7.1      
Raw magnetics                 nT             99999.999      100   109   F10.3     
Post compensated magnetics    nT             99999.999      110   119   F10.3     
Diurnal                       nT             99999.999      120   129   F10.3     
Final magnetics               nT             99999.999      130   139   F10.3     

DATA PROCESSING               

COORDINATE DATA               
All lines are scissored to the following rules:                            
  1) A 'smooth' edge outside the area boundary.                            
  2) Maximum line overlap of 0 fiducials within                            
     the area boundary.                                                    

The local projection is a UTM projection based on the                      
GDA94 spheroid with a central meridian of 147 East degrees.                
System parallax of 0.6 fiducial has been removed.                          

MAGNETIC DATA                 
The magnetic data has been corrected for regional gradient by subtraction  
of IGRF model 2005 computed continuously over the whole area based on      
the GPS height.                                                            
Diurnal magnetic variations have been removed.                             
System parallax of 1.6 fiducial has been removed.                          
Tie-line levelling has been applied.                                       
Microlevelling has been applied.                                           
A base value of 61320 nT has been added to the data.                       

