 |
 |
 |
|
||
|
|
Local Control Point Search
This Service allows you to quickly find most relevant Trig Beacon and Town Survey Mark Control Points within the local area around a specific site.
You have to specify a Co-ordinate of a point from which local Trig Beacon and Town Survey Mark Control Points should be searched, preferably on or in the centre of the site. Control Points will be searched within the specified distances around the entered co-ordinate.
You have to specify the correct Central Meridian as the Y Co-ordinates repeat for each different one and the rough latitude is used to speed up the search such that the whole Meridian is not searched. The Nearest Town/City function is used for Town Survey Marks or if the above parameters are not known. There are many Towns and Cities in the Database so they are sorted alphabetically.
Map Co-ordinates for both the WGS84 and Clarke1880 ellipsoids are available.
Information about Terms used on this Page:
Map Projections in South Africa and why it's relevant to this Service
Information about Point Memory and how it works
Spatial Reference is constantly looking for more ways to maintain a high level of security for account data and information, but accept no responsibility for the theft or leak of information. Spatial Reference encourage users to check data supplied by this service against your companies Accuracy Standards and accept no responsibility for the misinterpretation of the data and errors caused by using data supplied by this Service.