Term RMS refers to the mathematical Root Mean Square which is an average of peaks and valleys of a materials surface profile. Ra stands for roughness average. Ra is a average of only peaks; therefore, to get an Ra, multiple your 3.2 to 6.3 by 2 to get 6.4 to 12.4 Ra. AF Kenton.
Closest Airport to Siesta Key, FL. The closest airport is Sarasota Bradenton International Airport (SRQ). Distance from Sarasota Bradenton International Airport to Siesta Key is 10,4 kilometers (6,5 miles).
1 Miami International Airport-the biggest airport for travel in South Florida, and the best option for trips to the Everglades or Miami's beaches. 2  Tampa International Airport-serves the Gulf Coast, namely the Tampa Bay area.