How is wind resource assessment performed for a potential wind farm site?

Wind resource assessment includes: desktop study (reanalysis data, regional wind maps), on-site measurement campaign (met masts with cup anemometers at hub height and multiple levels, typically 1-3 years), remote sensing (SODAR, LIDAR for wind profile), long-term correlation (correlate short measurement with long-term reference data), flow modeling (microscale models for terrain effects), uncertainty analysis (combine measurement, modeling, climate uncertainties), and energy yield prediction (apply turbine power curves). Measurement accuracy and representativeness are critical - small wind speed errors cause large energy errors (power proportional to v^3).