In construction projects, contour mapping is an essential tool to first understand the structure of the site, then calculate how much soil and other material needs to be added or removed to make the structure of the site fit the construction plan, and then to understand and verify how the terraforming of the land fits with the engineering design. For many types of agriculture, especially tree crops (like mangoes, macadamias, avocados, etc), planting along the contours of the land is the best strategy for maximum yield. Why are contour surveys are so important?Įlevation data is essential for planning your home or any building construction projects, and following the contours of the land is the cheapest way to build roads and tracks through your property. Looking to obtain a contour survey of your land? Call us on 07 3103 0566, email or complete the Online Enquiry Form so we can discuss your requirements.
CONTOUR MEANING IN SURVEYING FREE
Please feel free to chat with us about this if you have concerns. Where there are doubts about accuracy due to long grass or thick vegetation, Lidar mapping will generally deliver a better result as it can, to some extent, “see” below the vegetation to the underlying ground levels.
Standard drone mapping relies on making connections (extrapolation) between visible ground points, just as a traditional ground survey does. We use both Lidar and photogrammetric aerial survey techniques and generally speaking any terrain with less than 50% tree cover can be mapped using a photogrammetric drone mapping camera with a reasonable degree of accuracy. Can precise aerial land mapping only be achieved using LIDAR? Both methods have similar processing times, although drone survey results are usually ready in a few days, while ground survey data can take weeks to process and deliver. The area a ground surveyor would take a week to complete can be done with a drone survey in a day or two. Not at all! The area that a ground survey team can cover in a day can be covered by an aerial survey in 1-2 hours. You do the math! Is a registered surveyor faster and cheaper than a drone survey?
Aerial surveys can measure 100s of points per square metre. Ground surveys typically measure around 5-6 points per square metre or less. In theory, a surveyor’s PPK measurement system can achieve accuracy 5mm, but in reality the average accuracy used by surveyors on ground surveys is around 10-15mm, which is very similar to the accuracy achieved by a well-designed drone survey (15-25mm). Are contour surveys by a registered surveyor more accurate than drone surveys?
We partner with a registered surveyor (yours or ours) where certification is required. Otherwise, surveyor certification is generally not required.
A registered surveyor is required if the contour survey data is being used for construction or engineering purposes, or if the boundary data is being registered on a government cadastral (land title) system. Do contour surveys need to be conducted by a registered surveyor? From this simple base, you can even develop water flow models, stream maps and determine the best places to create dams and silt traps.
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By understanding the land contours, you can easily visualise or map how water will flow over the property when it rains, where it will collect, where it might erode the soil and many other important water flow characteristics, where to build access roads and how to farm your property along the contours. A contour survey is a way to easily visually understand the vertical and horizontal shape (the “topography”) of your land.
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