ISO 17123-11-2025 PDF

Full title and description

Optics and optical instruments — Field procedures for testing geodetic and surveying instruments — Part 11: GNSS instruments. This international standard specifies field verification procedures to check that a GNSS-based system and its measurement procedures meet a required measurement uncertainty at the location and time of interest, using three‑dimensional coordinate comparisons to suitable reference coordinates.

Abstract

This document defines a practical, technology‑neutral field procedure for verifying GNSS instruments and workflows. It is designed to be applicable to a wide range of GNSS equipment and correction/data streams, and to capture the main parameters affecting coordinate determination when instruments are used under normal operating conditions in the field. The procedure enables regular on‑site verification with limited economic impact.

General information

• Status: Published (International Standard).
• Publication date: July 2025 (ISO edition: 2025-07; several national catalogues record publication/adoption dates in mid‑July 2025).
• Publisher: International Organization for Standardization (ISO); national adoptions published by national standards bodies (e.g., BSI, DIN, LVS).
• ICS / categories: 17.180.30 (Optical measuring instruments; geodetic and surveying instruments).
• Edition / version: Edition 1 (2025).
• Number of pages: ISO original: 28 pages (some national publisher catalogues list slightly different page totals for their published/pdf versions, e.g. 28–38 pages depending on national forewords/format).

Scope

The standard specifies a field procedure to verify that a GNSS‑based system and its measurement procedure achieve a specified measurement uncertainty at the location and time of interest. The verification uses 3‑D coordinate comparisons against reference coordinates and is independent of receiver technology, satellite data streams, or correction services. The procedure includes delimitation criteria so it can be applied in a variety of operational contexts and repeated in the field as a practical check of suitability for a given task.

Key topics and requirements

• Definition of a field verification workflow for GNSS coordinate determination and uncertainty assessment.
• Use of three‑dimensional coordinate comparisons to established reference coordinates (check points / control).
• Technology‑neutral approach: applies regardless of receiver type, satellite constellations, or correction data streams.
• Delimitation criteria and operational conditions to ensure test results reflect real‑world field use.
• Guidance to allow regular, cost‑effective on‑site verification rather than full laboratory calibration.

Typical use and users

Primary users include land surveyors, geodetic engineers, cadastral authorities, construction survey teams, calibration and testing laboratories, GNSS equipment manufacturers, and quality assurance personnel who need an on‑site method to verify GNSS measurement performance and conformity with required measurement uncertainties for specific tasks.

Related standards

This part is one element of the ISO 17123 series on field procedures for testing geodetic and surveying instruments; related parts include rotating lasers (ISO 17123‑6:2025) and other parts under development such as the UAV photogrammetry workflows (ISO 17123‑10 — draft stages). Users should consult the ISO 17123 series for complementary procedures relevant to specific instrument types and surveying tasks.

Keywords

GNSS, GNSS instruments, field verification, geodetic instruments, surveying, measurement uncertainty, coordinate verification, ISO 17123, field procedures.

FAQ

Q: What is this standard?

A: ISO 17123‑11:2025 is an international standard that specifies field procedures to verify that GNSS‑based surveying systems meet required measurement uncertainties by comparing measured 3‑D coordinates to reference coordinates.

Q: What does it cover?

A: It covers practical, technology‑neutral on‑site verification methods for GNSS instruments and workflows, including delimitation criteria, test setup, and interpretation of results to reflect instruments used under normal field operating conditions.

Q: Who typically uses it?

A: Surveyors, geodesists, construction and engineering survey teams, equipment manufacturers, calibration labs, and QA staff who need to confirm GNSS measurement performance on site.

Q: Is it current or superseded?

A: As of its publication in July 2025 it is the current international standard for GNSS field verification within the ISO 17123 series. National adoptions and related drafts were published or updated in mid‑2025. Users should check national standards bodies for any country‑specific adoptions or forewords.

Q: Is it part of a series?

A: Yes — ISO 17123 is a multipart series covering field procedures for testing various geodetic and surveying instruments (other parts include rotating lasers, and parts for UAV photogrammetry and other instrument types). Consult the ISO 17123 series for related parts and updates.

Q: What are the key keywords?

A: GNSS, field verification, measurement uncertainty, geodetic instruments, surveying, coordinate comparison, ISO 17123.