What is the main purpose of conducting a post-deployment site survey?

After APs are installed, a post-deployment (validation) survey measures actual RF coverage, signal levels, channel utilization, and client capacity to verify the network performs as designed and to identify gaps or interference not anticipated during pre-deployment planning.

Estimating AP placement is a pre-deployment (predictive) design activity, not the purpose of a survey conducted after the network is already live.

Generating heatmaps is a byproduct or tool used during a survey, not the primary objective; the goal is to validate the network meets design targets.

Documenting network topology is a network management and documentation task unrelated to the RF validation purpose of a post-deployment site survey.