User:Chinnz
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| — Wikipedian ♂ — | |
 Chinnasamy R | |
| Name | RM Chinnaswami |
|---|---|
| Country |  India |
| Time zone | UTC+05:30 |
| Family and friends | |
| Marital status | UnMarried |
| Girlfriend | None |
| Children | None |
| Education and employment | |
| Occupation | Web Designer |
| College | PSG College of Arts and Science |
| Hobbies, favourites and beliefs | |
| Hobbies | Anything and everything. |
| Religion | Hinduism |
| Politics | No major views either way. |
| Contact info | |
| Website | chinnz.in |
| chinnz25@gmail.com | |
| Account statistics | |
| Joined | 18th October 2011 |
| Edit count | Over 866 and counting |
| Signature | ChinnZ |
John Rocque's maps of London were published in 1746. A French-born British surveyor and cartographer, John Rocque produced two maps of London and the surrounding area. The better known of these, depicted here, is a 24-sheet map of the City of London and the surrounding area, surveyed by Rocque and engraved by John Pine and titled A Plan of the Cities of London and Westminster, and Borough of Southwark. Rocque combined two surveying techniques: he made a ground-level survey with a compass and a physical metal chain – the unit of length also being the chain. Compass bearings were taken of the lines measured. He also created a triangulation network over the entire area to be covered by taking readings from church towers and similar high places using a theodolite made by Jonathan Sisson (the inventor of the telescopic-sighted theodolite) to measure the observed angle between two other prominent locations. The process was repeated from point to point. This image depicts all 24 sheets of Rocque's map.Map credit: John Rocque and John Pine