Category Archives: Survey Practice

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

TheoLt for Leica TS Captivate series

This gallery contains 13 photos.

If you select TPS1200 as the instrument in TheoLt and assuming Bluetooth/Windows version compatibility this is how I got a TS15 ‘Captivate’ instrument to work with TheoLt, the cable option may require the correct cable for windows version: GEV 267 … Continue reading

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Achieving closure: the first Bowditch adjusted traverse?

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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

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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

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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

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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

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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

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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

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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

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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’

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‘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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