Secondary Sample Designs
 Unlike initial sample designs, secondary sampling designs are dependent on previously existing samples. SADA contains 11 secondary sample designs:
 ·   Threshold Radial 
 ·   Adaptive Fill 
 ·   High Value 
 ·   Highest Prior Values 
 ·   Extreme Value 
 ·   Area of Concern Boundary 
 ·   AOC Prior Boundary 
 ·   Minimizing/Maximizing Area of Concern 
 ·   Ripley's K 
 ·   Moran's I 
 ·   Geary's C