SL Grid 99 Projection For Garmin GPS Receivers.

 

In GIS, it is critical that the datum and coordinate system of your data, including base map data, are explicitly defined (and ultimately the same). Before collecting data,make sure the GPS unit is set to the coordinate system and datum that best matches your needs. 

 

 How to Setup the Cordinate System & Projection to Your Garmin GPS? (For Sri Lanka)

1.From the Main Menu page, select Setup

 

2.Scroll down and select Units

. 

3. Select the Position Format (coordinate system) you wish the output coordinates to be in. 

 

4. Select User UTM Grid. 

 

5. Enter the Parameters Correctly

 

• Longitude Origin = 80 deg  46.303 min
• Latitude Origin = 0 deg 0.000 min
• Scale Factor = 0.9999238
• False Easting = 200000
• False Northing = (-)573992

 

5. Select Datum. = Kandawala 

 

( It is especially important that the datum be correct, since it represents fundamental assumptions about the size and shape of the earth.)

 

 6.When done, highlight Save and press ENTER

 

These Parameters Only Valid for within Sri Lanka and Garmin GPS.

 

Other GIS Practices (Arc Map & etc) Please Use, Below mentioned Parameters: 

 

• • Projected Coordinate System:    SL_Grid
  • Projection:    Transverse_Mercator
  • False_Easting:    200000.00000000
  • False_Northing:    200000.00000000
  • Central_Meridian:    80.77171100
  • Scale_Factor:    0.99992384
  • Latitude_Of_Origin:    7.00017290
  • Linear Unit:     Meter
  
  
  • Geographic Coordinate System:    GCS_Kandawala
  • Datum:     D_Kandawala
  • Prime Meridian:     Greenwich
  • Angular Unit:     Degree
   
• Datum Parameters:
• • Datum: D_Kandawala
  • Spheroid: Everest_Adjustment_1937
  • Semimajor Axis: 6377276.344999999700000000
  • Semiminor Axis: 6356075.413140240100000000
  • Inverse Flattening: 300.801699999999980000