How to set Scale Factor for Lambert Conformal Conic (LCC) projection in ArcGIS Deskto

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The projection for my state according to my country's Mapping Agency is in a specific Lambert Conformal Conic (LCC) projection. They have given values for the following parameters:

  • False Easting
  • False Northing
  • Central Meridian
  • Standard Parallel 1
  • Standard Parallel 2
  • Scale factor
  • Latitude of origin
  • Datum/GCS
When I go to ArcCatlog, to update an existing LCC projection, I can see all the parameters except for the Scale Factor:



How do I enter the Scale Factor? The ArcGIS help mentions this parameter but does not mention how it to be used.

A semi-related question is: How important/required is the Scale Factor? I have seen several LCC projection without the Scale Factor. Even Snyder's Map Projections: A Working Manual does not mention it, when describing the Lambert Conformal Conic projection.



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