Available online
Description
the programme looks at several aspects of map making by the Geological Survey division. the various problems that are posed to the mapper are illustrated in three very different sorts of geological... environment. Snowdonia has a large amount of solid rock exposed but a complex geology. Along Hadrian's Wall may of the underlying rocks are hidden by glacial deposits and peat. Finally, the urban development in Tyneside covers nearly all the underlying features with brick, concrete and tarmac. We follow in detail the process of map production from the geologist working in the field through the stages of modern cartography to a completed geological map in the large 1:10,000 scale. The modern techniques of colour screen printing are compared with the 19th century methods of engraving and hand colouring maps. Valuable maps, includin the first ever geological map made by William Smith in 1817 are shown in the programme.
the programme looks at several aspects of map making by the Geological Survey division. the various problems that are posed to the mapper are illustrated in three very different sorts of geological... environment. Snowdonia has a large amount of solid rock exposed but a complex geology. Along Hadrian's Wall may of the underlying rocks are hidden by glacial deposits and peat. Finally, the urban development in Tyneside covers nearly all the underlying features with brick, concrete and tarmac. We follow in detail the process of map production from the geologist working in the field through the stages of modern cartography to a completed geological map in the large 1:10,000 scale. The modern techniques of colour screen printing are compared with the 19th century methods of engraving and hand colouring maps. Valuable maps, includin the first ever geological map made by William Smith in 1817 are shown in the programme.
| Module code and title: | S333, Earth science topics and methods |
|---|---|
| Item code: | S333; 05 |
| First transmission date: | 11-04-1976 |
| Published: | 1976 |
| Rights Statement: | |
| Restrictions on use: | |
| Duration: | 00:24:00 |
| + Show more... | |
| Producer: | Neil Cleminson |
| Contributors: | Howell Francis; Don Frost; Eric Tallis; Dave Williams |
| Publisher: | BBC Open University |
| Keyword(s): | Brick; Cartography; Concrete; Geological environment; Glacial deposits; Hadrians Wall; Map making; Snowdonia; Solid rock; Tarmac |
| Footage description: | Film shots of Tryfan and surrounding area in Snowdonia. Commentary by D Williams introduces the programme. E. H. Francis discusses the use of aerial photographs for constructing geological maps. He uses aerial photographs of the Tryfan area to illustrate his points. Francis continues his discussion. He explains how the use of computer corrected photographs (ortho-photographs) can overcome some of the problems of using aerial photographs, such as distortion etc. Francis goes on to explain how a geological map is produced from orthophotographs. D. Williams with a geological map of the area around Bath produced in the eighteenth century by William Smith. Williams explains how Smith came to produce this map and later a geological map of the whole of England. Shots of Smith's map of England with commentary by Williams. Don Frost, at the Roman Wall near Newcastle, points out some of the geological features of this area. Frost explains how he goes about his geological survey. Shots of Frost at work with some commentary (voice over) by D. Williams. Eric Tallis, chief cartographer, I.G.S. at Leeds, explains the colour screen printing technique of producing a geological map. He goes through the various production stages several of which are illustrated as he talks. Tall is goes on to describe how the I.G.S produces maps in the normal printed way. Shows some examples as he talks. Finally, Tallis shows a 19th century copper plate from which the original geological map of Newcastle was made and briefly describes the techniques used. Aerial shots of Newcastle. Commentary by Williams discusses some of the difficulties of doing geological surveys in urban areas like this. D. Williams explains the methods used to map these difficult areas such as examining old records like coal mine plans, etc. |
| Master spool number: | 6HT/71958 |
| Production number: | 00525_1211 |
| Videofinder number: | 1996 |
| Available to public: | no |
