This service provides spatial information
such as control point co-ordinates and Topographic Maps in South Africa,
various surveying or spatially related calculations, unit conversion and co-ordinate
conversion services. Spatial Reference is intended for a wide field of users such as
Land Surveyors, Town Planners, Engineers, Architects, Geologists, etc...
The map service also provides information for a
wide range of users such as private pilots (For flight
planning), educational institutions, etc...
This service is FREE and you simply need
Register and then log on to start using Spatial Reference.
Control Points and Co-ordinates:
Spatial Reference database contains co-ordinates for almost all Trig
Beacons and Town Survey Marks in South Africa in both the WGS84
system and the older Clarke 1880 system. You can either search for
specific control points using the name / number or you can search for a
control point using the co-ordinate. Another very useful tools is the
Local Points Service which requires a point to be specified and then
finds all control within a specified radial distance from that point.
These services greatly reduce the time needed to find control before
surveying or mapping a site.
service provides about 1600 topographic maps
covering the entire surface of South Africa. These maps have been
obtained from the NGI (National Geo-Spatial Information) and converted
to a user-friendly format (.JPEG) that is easy to download and view from
this website. The graphical map selection interface makes selecting a
specific map very easy and is useful for extracting spatial information
for surveying, planning, navigation, flight planning, education
Online Calculation Services:
Many surveying / spatially related online calculation services have been
added since the site started. These include
calculations such as Join, Polar, Intersection and Resection
calculations. Units of Length/Distance, Area and Angles can be converted
between a wide range of standards. A special unit converter was also
added to specifically convert units of area as described on older South
African Property Diagrams and Title Deeds. Point co-ordinates can also be converted from Gauss
conform mapping co-ordinates to Geographical (Latitude and Longitude)
co-ordinates and vice versa.
Point Memory Service:
The point memory service was added to make using Spatial Reference even
easier since it stores co-ordinates of points obtained in searches and
calculations in the session memory making it available for all the
different services provided by this site. This greatly reduce time
needed and human-error when copying co-ordinates from one service to
Cell phone Version:
of the services are also available on a smaller interface intended for
cell phones. This provides a means to search for control point
co-ordinates or to do calculations in the field while surveying.