HO 4 — NGS TU0666 — Kapolei, US

This triangulation station is part of the National Geodetic Survey's network of control points establishing the horizontal geodetic framework across the United States. Located near Kapolei on the island of Oahu, Hawaii, at coordinates 21.32056°N, 158.01528°W, this trig point serves as a reference for surveying, mapping, and spatial data collection activities throughout the Hawaiian Islands region. Triangulation stations of this type were historically observed and monumented to provide accurate horizontal positioning for topographic mapping and engineering projects. As part of the NGS network, this point contributes to the national geodetic infrastructure and remains valuable for verification of survey work, boundary determination, and geographic information system applications. Surveyors and geospatial professionals rely on documented benchmark positions to ensure consistency and accuracy in local and regional surveys. Proper documentation and periodic validation of such control points supports the integrity of Hawaii's spatial data infrastructure.

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