There are several different ways to survey landforms, in part because of the elements a particular area of terrain may have or the elevation that is involved. Tradition or more conventional surveying processes make use of theodolites, but there are other options that can be selected. A number of factors may impact which survey method is chosen for a particular project, helping settle the question if there is one survey method that stands out as better than another.
Compare the Methods
A brief description of common surveying methods can give you an idea of what a particular survey may be used to accomplish. Not only do the differences address how the survey may be done, but these also change the results or information found in the concluding report.
Conventional Survey
Traditional surveys of a property’s topography are generally done using theodolites or other laser measurement tools. This option provides a cost-effective visual inspection of an area that is too small for more advanced tech equipment to be brought in. It is considered highly accurate and provides reliable results, though there can be disadvantages from obstacles that may block a clear line of sight. This format is also more labor-intensive and takes longer to produce the data or results.
Photogrammetry
In this option, larger areas of land are surveyed using aerial photography. GPS equipment and high-resolution cameras are used as an airplane follows a specified flight pattern. The data, through the use of a computer, is transformed into a three-dimensional model. Because it requires less manual labor, it is often a less expensive per-acre option to gather large amounts of data. There are some disadvantages, namely high and low-level sight obstructions from vegetation, an inability to see the ground close to ditches or streams, and timeline challenges due to seasonal vegetation growth.
LIDAR
This topographic method works with Light Detection and Ranging Equipment to provide an accurate measurement and assessment of a property. Using a near-infrared laser and GPS receiver, a land area is mapped and data transmitted to form the report. One benefit of this format is the ability to measure through thick vegetation, but there are also the benefits of reduced expenses with regard to time and labor. Key disadvantages include the loss of capturing small details of things ditch depth and loss of accuracy with harder surfaces such as concrete or pavement.
Evaluate the Needs
Though each survey method is capable of providing accurate topographic results, it is best to choose the format that will supply the information needed for a particular project. Different levels of accuracy may be required when different features or terrain are involved, leading one method to potentially be preferable over another. The purpose of the data should inform which method is better.
Purchase Your Supplies
For the best prices on surveying equipment, including theodolites, shop the selection at Engineer Supply. There are a number of measurement tools with a variety of distance capabilities and accessories, giving you the chance to find exactly what your project requires. Find everyday low prices and fast, efficient shipping at Engineer Supply.
