When to use this guide
Use this guide when reviewing a traverse or planning conventional-network observations. Establish start/end points and reference orientation, then test measurement traceability before assessing adjusted coordinates.
Closure and Bowditch corrections support arithmetic review, but alone do not establish acceptance of a SANSRS-tied network. Where the Geodesy guide applies, consult its adjustment and testing provisions rather than assuming any adjustment method is interchangeable.
The checklists and examples are original GeoGiza guidance, not specification text, a translation or a compliance certificate. Consult the original document and project scope for applicable grades and mandatory limits.
Edition verified; currentness unconfirmed
Publisher, V1.0, copyright 2025 and page locators were checked on 11 October 2026. The copyright year is not a verified publication date. Currentness and any superseding update remain unconfirmed; check with GEOSA, the receiving authority and the project contract before adopting requirements.
What to prepare before review
- Control coordinates, provenance, frame, epoch and starting orientation.
- Raw angles/distances, units and ordered traverse legs.
- Instrument/prism heights, centering/calibration checks and repeat logs.
- Network class, processing method, tests and receiving-authority requirements.
Practical review steps
- 1
Establish the control connection
Match point identifiers to descriptions and coordinate provenance. Record project frame, projection, zone and epoch; an older-datum point does not become KSA-GRF17 by renaming the file.
- 2
Inspect observations before closure
Use the existing traverse template for structured inspection; check units, orientations, station sequence and repeats. Preserve the raw version when correcting an entry.
- 3
Select processing for the commissioned task
Compute raw closure with the tool, then request adjustment appropriate to the network class. For precise control, document weights, residuals and required tests; distributing closure does not reveal every systematic error.
- 4
Tie the decision to a reproducible review file
Retain control, observations, raw calculations, adjustment report, software versions and issues. Assign an action and owner to each reservation; a tidy adjusted result does not establish network quality.
Understand the concept visually
Original GeoGiza teaching diagram · synthetic data · not acceptance limits or official approval
Traverse endpoint misclosure
Endpoint difference means calculated minus reference. In this teaching example dx = +0.030 m and dy = −0.040 m, giving a 0.050 m misclosure. The difference vector is enlarged for visibility.
e = √(dx² + dy²) = 0.050 m; cEᵢ = −dx × Lᵢ / ΣL; cNᵢ = −dy × Lᵢ / ΣL
Misclosure describes a difference; acceptance requires the applicable reference, work grade and observation checks.
cEᵢ and cNᵢ correct the east/north components of each traverse leg; Lᵢ is its length and ΣL the total leg length. Bowditch corrections oppose the misclosure and are proportional to line lengths; distributing them does not prove control-network quality. Not to scale.
Consult this topic’s document locatorsSYNTHETIC teaching example — not field observations or a tolerance limit
Synthetic example: small closure, missing evidence
A synthetic traverse has coordinate differences of 0.012 m east and 0.016 m north, a magnitude of 0.020 m. Only adjusted coordinates are supplied; observation weights and control provenance are missing.
What to record in the review
Record the arithmetic difference and request raw observations, ties and processing evidence before deciding. The example’s 20 mm is neither a Saudi acceptance limit nor proof of network quality.
Mistakes affecting the review decision
- Importing a tolerance from a different commission or country.
- Adjusting a SANSRS network arithmetically without appropriate reports/tests.
- Removing discrepant observations without an exclusion record.
Official sources and reading locators
Printed and PDF page numbers match in these copies. Source addresses are copyable under the publisher’s linking terms; consult the complete provision in the edition applicable to your project.
General Authority for Survey and Geospatial Information (GEOSA) · Technical reference
Technical Guidelines for Land Surveying
V1.0 · copyright 2025 · publication date not stated
- Locator:
- 2.2.5.2–2.2.5.3 — conventional control
- Printed pages:
- 19
- PDF viewer pages:
- 19
Publisher document address — copy into your browser:
https://geoportal.geosa.gov.sa/Geoportal/pdf/Land%20Survey%20Technical%20Guideline.pdf#page=19General Authority for Survey and Geospatial Information (GEOSA) · Technical reference
Technical Guidelines for Land Surveying
V1.0 · copyright 2025 · publication date not stated
- Locator:
- 2.6.3.1.2 — traverse observations
- Printed pages:
- 73
- PDF viewer pages:
- 73
Publisher document address — copy into your browser:
https://geoportal.geosa.gov.sa/Geoportal/pdf/Land%20Survey%20Technical%20Guideline.pdf#page=73General Authority for Survey and Geospatial Information (GEOSA) · Technical reference
Technical Guidelines for Geodesy
V1.0 · copyright 2025 · publication date not stated
- Locator:
- 2.7 — control-network adjustment
- Printed pages:
- 53–54
- PDF viewer pages:
- 53–54
Publisher document address — copy into your browser:
https://geoportal.geosa.gov.sa/Geoportal/pdf/Geodesy%20Technical%20Guideline.pdf#page=53Source checked:
Frequently asked questions
Does Bowditch establish Saudi control-network compliance?
No. It is an arithmetic distribution method in the existing tool. Establish network scope and processing/testing requirements from the reference and commission; it does not replace required adjustment and validation.
Do I need a new Saudi traverse template?
The existing generic template organizes observations. Attach control provenance, epoch, processing report and project requirements; the template is not a GEOSA approval form.