Land-leveling (also called land grading and land forming) is the reshaping and contouring of the land surface with tractors and scrapers according to predetermined gradients with the purpose of providing good surface drainage (run-off) and to promote uniform infiltration of water. To achieve this, accurate cutting and filling operations need to be performed depending on the difference between the existing and desired land profile.
The completed process consists of the following steps: surveying, designing, leveling and verification and is done using Trimble® GPS technology.
The Trimble® FieldLevel™ II system is used to streamline the surveying. Designing is done by Optisurface, Australian company with experience and a guarantee on their design (www.optisurface.com).
GPS surveying enables us to precisely map the general topography of the land, create boundaries, interior points and surfaces, and to accurately calculate and report on the true acreage of the surveyed area as to ensure optimal field coverage and accurate surface design.
This 3D survey is then sent to Optisurface. Using auto- and multi-plane design software a complete 3D agricultural earthworks design is created. This design optimizes the current land profile into the desired land profile in terms of the required orientation and grades and is then fed back to the Trimble® FieldLevel™ II system.
This system allows complete and reliable mechanical and GPS integration and scraper hydraulics are automatically set according to the preset 3D design allowing for accurate, GPS-based filling and/or cutting during land-leveling.
Final land-leveling can also be done using laser-based systems, however these systems suffer from a number of drawbacks including limited range due to the natural curvature of the earth, lack in providing any direct measure of accuracy and integrity of the system, cannot be operated when visibility is low and its inability to provide for curved and/or three-dimensional profiles.
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