As land surveyors, we have many years of experience in the surveying industry, with our focus being on topographic, aerial or photogrammetric, cadastral and engineering or construction surveys.
Our aim is to give the highest quality service, in the fastest possible time. Whether the survey is beneath the earth’s surface or up in the sky – we will take on the challenge and get it done.
- TOPOGRAPHIC (tache/contour or mapping survey)
A topographic survey is used to determine the relative locations of places on the earth’s surface, such as boundaries and buildings, by measuring horizontal distances, differences in elevation and which direction these are facing.
We compose surveys drawings detailing the features and the lay of the land, such as trees, banks, roads, municipal services, contours, levels, building footprints. This serves as a base map to be referred to when working with the design of different types of buildings, either residential or commercial, or when designing roads or driveways. It is essential for a designer to be able to see the perimeter boundary lines and the lines of easements on or crossing the property being surveyed, so that they can correctly show zoning and other required setbacks.
- AERIAL / PHOTOGRAMMETRY SURVEY
An aerial photogrammetry survey is the process of combining aerial photographic images to create 3D rendered images of land – taking different angles of an area and combining them to create a 3D image.
Aerial photographs are a uniquely accurate source of information about roads, buildings, railways, rivers, and other topographic features that contribute to a map.
- ORTHOPHOTO SURVEYS
What is an Orthophoto and what does it do?
An orthophoto is an aerial photograph geometrically corrected, so that the scale is uniform: the photo has the same lack of distortion as a map. Unlike an uncorrected aerial photograph, an orthophoto can be used to measure true distances.
Mark Wijnberg Land Surveyors specialises in using Unmanned Aerial Vehicles (UAV) or drone technology (to photograph land from an aerial perspective). With this UAV/Drone technology, we are able to produce accurate images to 0.1cm/pixel. These images can be used for planning, digitising, and give a scaled view of the ground from above. The high-resolution imaging is also available in near infrared and is often used in conjunction with a geographic information system (GIS).
An orthophoto survey is done sending a UAV/Drone containing a high tech camera into the sky, which is controlled manually by Radio Control on land by our experts. It then photographs the relevant area/s of land in order to give an accurate overview for our clients.
- THE BENEFITS OF USING A DRONE FOR MAPPING
There is very little set-up cost involved in using a drone, which makes it cost-effective. A drone can be used almost anywhere at any given time, with a set-up time of only ten minutes, and first results being available within thirty minutes of the drone flight. Generally speaking, one hectare will take five minutes to survey, and four hundred hectares will take one hundred minutes.
Drones are cheap, extremely light and take up little space, making them easy to transport. The drone usually only requires one operator, which reduces costs as well.
Drones ensure safety is at its maximum, with surveyors able to stay on ground and no longer needing to venture into high-risk areas. All of these locations can be monitored from a remote location using the drone technology.
- 3D MODELLING
What is 3D modelling?
3D modelling is the process of developing a mathematical representation of any three-dimensional surface, in order for it to look just like it would in its natural form.
Using photogrammetry (the science of making measurements from photographs), we can produce a highly accurate rendered representation of a surface in 3 dimensions. This can be used for terrain analysis to derive contours, or show deformation of features like slabs and roads. A point cloud with many thousands of points per square meter, model the surface to give a digital copy. This is used in a geographic information system (GIS) and remote sensing applications.
This 3D rendered image assists architects and engineers in correctly visualising the area that needs to be designed or developed.
Property subdivision can be beneficial in many ways, such as reducing debt for homeowners by disposing of a portion of their land, and thus reducing their bond repayments and property rates. It is also a good way of improving security in a security conscious country, by living in a more confined space, with neighbours close by. We provide all necessary services – from feasibility studies and initial application, to final survey and registration documentation.
Here is a more detailed outline of the Mark Wijnberg Land Surveyors property sub-division process:
- The relevant information is acquired from authorities, so that preparation can take place to submit an application to the local council and various departments in order to request approval for subdivision of property.
- Once approval for subdivision has been acquired, Mark Wijnberg Land Surveyors start demarcating the subdivided area and any servitudes that are required, by means of beacons.
- Subdivision is usually subject to certain regulations by the local council. The developer and client then have to comply to these regulations for subdivision. One example of such regulations is extending the sewer line or building a sewer inspection chamber.
- Once the field survey has been done, Mark Wijnberg Land Surveyors prepare a survey diagram or plan which shows clearly the subdivided portions of land and the relevant dimensions of the boundaries, and the scope of the land and servitudes.
- These diagrams or plans are then submitted to the office of the Surveyor General, who then examines all of the technicalities relating to the land survey process, to ensure that all statuary approvals have been followed and are in place, and that the survey done by Mark Wijnberg Land Surveyors is in accordance with the Land Survey Act (8 of 1997).
- Once this has been approved by the Surveyor General, the property can be registered at the Deeds Office and dealt with by a conveyance attorney. The attorney deals with the registration of the land and transfers the subdivided land to a buyer, once he has ensured that the regulation conditions have been followed as spoken about in paragraph three.
- Mark Wijnberg Land Surveyors will require a copy of your title deed in order for us to prepare a quote to complete any survey and planning for land subdivision.
Boundary peg re-establishment
Boundary peg or beacon relocations is the process of reconstructing the position of the property beacons and boundary, which is an essential aspect to fulfil before building commencing, in order to ensure that building is not in a close proximity to the boundary lines. This process is carried out by our registered surveyors and is accompanied with beacon certificates.
Encroachment or boundary dispute survey
The extent and possible remedial action is quantified by our surveys, in order to establish the boundary lines before building commences – to avoid future consequences and disputes that may arise.
Sectional title surveys
When someone purchases a sectional title property, they do not purchase just the area that they will be dwelling in, but also a section or portion of shared property that is part of the communal area of a shared property. This usually applies to flats or complexes, where there is a communal pool, clubhouse, mailbox etc. This means that the owner takes responsibility for paying a portion (levy) towards the use of these communal areas under their sectional title.
We undertake the creation (and, subsequently, amendments and extensions) of Sectional Plans and associated documentation for lodgement and approval by the Surveyor General.
- ENGINEERING & CONSTRUCTION
Road & rail construction surveys
Surveying plays an important part in road and rail construction projects, in that it assesses the conditions for construction, before, during and after to ensure correct measures have been set out.
When compiling a road or rail survey, usually a topographic survey is done initially to determine the location of alignments and record the volumes materials of the earth that need to be added, removed, or moved. For larger areas of land, a photogrammetric survey is done, to develop the base map for the project.
In rail construction more specifically, it is necessary to determine all possible routes, costs, gradient and curvature of the land, if it is necessary for cuts and fills, and the location of bridging and tunnelling. We also determine the trial lines, the precise measurements of distances, directions and altitudes.
Once construction has been completed, and ‘as-built’ survey is done to assess any modifications to the original planning.
The alignment, guidance and monitoring of pipe jacking, tunnel boring and horizontal boring, using the correct equipment and instrumentation to cost effectively run a survey.
Pipe jacking is a method used for laying underground pipes without having to dig a trench. The pipes are assembled in an access shaft, and placed in position by a hydraulic jack.
Tunnel boring is the process of using heavy machinery to hollow out tunnels with circular cross sections.
Building/Structure monitoring surveys
Using specific survey instrumentation, we run high accuracy, long term monitoring surveys of buildings and structures such as dam walls, to detect whether movement has taken place. This is done before construction takes place, during the construction process and once the construction has been completed. Building or structure surveys are important to determine early detection of movement in structures and buildings, so that the engineers and builders can then make informed decisions on what measures to take regarding the engineering requirements.
Mark Wijnberg Land Surveyors then send a table to the client showing displacement over time, for the engineers and builders use.
Survey to determine and quantify the extent of deformation or difference of features such as road, building or structural shifts. The specific points of the different features are determined, then a certain amount of time is allowed to pass before re-measuring and calculating, after which a comparison between the two surveys is done to determine the differences.
Control, benchmark/levelling surveys
This is high accuracy benchmarking and control surveys to millimetre precision, to determine elevations and to set the grade lines of a slope. Levelling is the process of measuring vertical distances across the length of an area so that areas of elevation can be determined.
As constructed/as built surveys
These are surveys detailing the position of as-built features and the comparison against the design, to determine if the building has been built to plan or has deviated slightly to greatly from the original plan. These surveys are used to confirm the location of a building or road etc. as well as the dimensions of the structure. This type of survey is done during the building process, and usually done several times throughout the building process to ensure accuracy.
Survey to determine the volume of material such as open pit, tailings and quarry dumps, which are especially important in mining and road works. The importance of this type of survey is that an estimate can be done to check the efficiency of machines and mining methods. A volume survey is also important to determine how much a contractor should be charging. We usually conduct these calculations once a month, and provide them to relevant sections of the mining or road works company.
Fibre optic cable surveys
We deal with the positioning and reporting of fibre installations and the certification of measured lengths.
Precise surveys required for machine alignment, crane rail span and displacement measurement, which all require accurate surveying for correct performance. It is also valuable for machines that need to be calibrated. This type of survey is important, because the misalignment of machines can result in increased vibration and loads on the machine parts, which they have not been designed for and can leave permanent damage.
Measurements of borehole locations for ground water monitoring wells, using accurate tools and solutions for an effective survey of different types of holes. A borehole survey is useful in fulfilling the following functions:
- Knowing whether the hole is going to hit the target you selected.
- Knowing whether the change in bedding angle in the core has been caused by folded start or a crooked hole.
- Knowing whether your ore reserve calculations are factual or mere assumptions.
- Knowing whether your drill set-ups are going in the direction you intended in your holes.
- Knowing whether the oversize and undersize in your open pit operations has been caused by converging and diverging blast holes or not.