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A tale of 2 rigs.

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Canon S95 on 2 axis auto rig, power by mobile ‘phone battery control by Click Pan Pro. The tilt servo is a high torque model which means this rig can take the heavy Conon EosM if it needs to. Suspension … 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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Pendulum vs Picavet FAB

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A brain damaged noob writes – what is the difference in use between a pendulum and a picavet? ie the FAB of each solution. Thanks Good question. Turns out ‘FAB’ means ‘features, advantages & benefits’ so the following might be … Continue reading

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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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The twin churches at Swaffham Prior

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Any visitor to Swaffham Prior will be puzzled at to why there are 2 churches in the same churchyard there. The story something of  a puzzle but there are good online sources which cover the detail. In this post find … Continue reading

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Unlearning line: what is LOD 500?

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Originally posted on Billboyheritagesurvey's Blog:
Can a survey scale relate to a BIM* LOD? “LOD 500: The Model Element is a field verified representation in terms of size, shape, location, quantity, and orientation. Non-graphic information may also be attached…

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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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