Category Archives: Survey Practice

I qualified in the early eighties and have been in practice ever since.

Achieving closure: the first Bowditch adjusted traverse?

This gallery contains 16 photos.

Origin of the Bowditch method. Published in 1802 Nathaniel Bowditch’s exposition on navigation is famous among surveyors for its description of the traverse adjustment method which bears his name. The method first appears for the computation of Traverse Sailing.  Bowditch … Continue reading

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RP Elevations by TheoLt & QGIS

This gallery contains 14 photos.

Originally posted on Billboyheritagesurvey's Blog:
Required tools • AutoCAD /BricsCAD • TheoLt • Image processing tools: Light room/Photoshop/MS Paintshop • QGIS https://www.qgis.org/en/site/forusers/download.html# QGIS is a freeware, open source, GIS compiler for map based database work. It includes a useful…

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As built 1856

This gallery contains 11 photos.

Preliminary results of metric survey for conservation. TST traverse and wireframe plus rectified photography, measured drawing and roof details by KAP: B

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2 & half D

This gallery contains 7 photos.

Working up drawings from wire frames and point clouds needs a way to get 3D info into 2D space. Selective modelling provides a method for edge extraction of complex or repetitive details. The projection of curved or oblique alignments onto … Continue reading

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Plot lines: CAD to PDF

This gallery contains 19 photos.

I have clients who want definitive plots from PDF, they don’t want DWG they actually want paper and, for them, PDF is paper equivalent. I quickly discovered PDF does its own thing when it comes to line weights, and to … Continue reading

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1:50 Level Of Detail

This gallery contains 11 photos.

Mapping heritage value. This recent project specified a 1:50 issue, at plot size the font (above) above appears as 20mm tall, the moulding lines are suggestive rather than ‘as cut’ but none the less depict a close facsimile of the … Continue reading

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Decorated & perp friezes

This gallery contains 5 photos.

Dealing with foliate detail is tricky, half the struggle is deciding on a system of depiction. Fortunately others have been here before us and following a template makes the job easier. The mason who cut the stone would have been … Continue reading

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Presenting metric measured drawing

This gallery contains 11 photos.

Line weights make a big difference to the readability of drawings. By emphasising opening edges depth in the view is apparent and architectural form is evident as space and volume. Sections tend to reveal the value of lineweights as queues … Continue reading

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On ‘digital draughtsmanship’

This gallery contains 13 photos.

‘Reality capture’ is only the begining. I’m untangling some drawings derived from laser scans and the lack of clear notes of architectural form and detail compromises the work. Once again I’m forced to reflect on the powerful measurement technologies at … Continue reading

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D3aBT..back from the dead!

This gallery contains 18 photos.

It’s not often obsolete devices come back from the dead but this has happened for the Disto3aBT. Leica have released a new version of their DistoTransfer software that gets it working with Windows 10. Microsoft killed my Disto. It’s been … Continue reading

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