To assist users in identifying the products required, index maps indicating the available maps and latest aerial photography are printed annually. These index maps are available free of charge and are obtainable from the Chief Directorate : Surveys and Mapping in Mowbray or from the offices of the Surveyor-General.
How
to identify the map to order :
Each map covers a different area of the country and it is important to order the correct map. Each map can be identified by its unique number (e.g. 2830CB) and scale, or by name (e.g. 3318 Cape Town -
1:250 000).
- Each degree square is designated by a 4-figure number made up of the values of the Latitude and Longitude (in that order) at its NW corner
- Each degree square is divided into sixteen
1:50 000 sheets, each15' x 15' . These are lettered ABCD as indicated
- In the sketch, the red area indicates the coverage of sheet 2830CB of the
1:50 000 series.
How
to identify the aerial photograph to order :
Each aerial photograph covers a different area at a particular date. It is therefore possible to have more than one aerial photograph covering the same place at different scales, each taken at different times e.g. in 1958 and again in 1975 and again in 1993. Each aerial photograph is uniquely identified by its Job number, Strip number and Photo number. These three numbers are used in ordering the current aerial photograph. The numbers can be obtained from the flight plan for the aerial photography job (Job number) or by visiting one of the offices where the aerial photographs are available for viewing.
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Where to purchase maps, aerial photographs, co-ordinates, heights and other services : |