Specifications

ASPRS
ASPRS Positional Accuracy Standards for Digital Geospatial Data
ASPRS Horizontal Accuracy Specifications
ASPRS Vertical Accuracy Specifications

FEMA
FEMA Procedure Memo NO.61

USGS

Current
USGS LBS V1.2
Old
USGS NGP Spec V13
USGS NGP LBS V1.0
USGS NGP LBS V1.1

NERC
NERC FAC003
NERC FAC008
NERC FAC009