Các thuật ngữ chính trong trắc địa chuyên nghiệp và công nghệ địa không gian.
WAAS is a satellite-based augmentation system that improves the accuracy of GPS and GNSS positioning for surveying applications by transmitting correction data across wide geographic areas.
WGS84 (World Geodetic System 1984) is the global reference datum that defines the Earth's shape, size, and coordinate system used by GPS and modern surveying instruments.