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Related Concept Videos

Methods of Obtaining Topography01:25

Methods of Obtaining Topography

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Topography involves measuring and mapping land elevations, natural features, and artificial structures to create accurate representations of the terrain. Topographic surveying relies on traditional and modern methods, each with distinct advantages and limitations.Traditional Surveying Methods:Transit stadia surveys and plane table surveys were widely used traditional surveying methods. These techniques relied on instruments like theodolites and stadia rods for measuring distances and angles,...
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Topographic Surveying and Contours01:29

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Topographic surveying is critical for documenting the Earth's surface, focusing on capturing elevations, slopes, and natural and man-made features. It is essential in construction planning, water resource management, and land-use analysis. The primary outcome of such surveys is a topographic map, which uses contour lines to visually represent the shape and slope of the terrain, providing valuable insights into the landscape's characteristics.Contour lines are fundamental to understanding the...
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Plotting of Topographic Maps01:29

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Topographic maps represent the Earth's surface features using contour lines, which connect points of equal elevation to create a two-dimensional representation of three-dimensional terrain. Creating a topographic map requires a systematic approach.Begin by plotting a scaled grid and marking intersections corresponding to the survey's elevation data points. Assign elevation values at these intersections to build the base map. Next, determine contour levels using a consistent contour interval,...
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Profile Leveling and Cross Sections01:26

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Profile leveling and cross-sections are surveying methods used to determine and document terrain elevations for infrastructure projects such as highways, railroads, canals, and pipelines. These methods provide data for earthwork planning and alignment of proposed routes.  Profile leveling involves measuring elevations along a fixed line to create a vertical terrain profile. A surveyor sets up a leveling instrument at the benchmark (BM) and records a backsight (BS) to determine the...
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Surveyors use Global Positioning System (GPS) technology to measure the precise location and elevation of points on Earth. In a recent survey, GPS receivers were used to determine the coordinates and elevations of two park monuments. The process involved careful mission planning, data collection, and correction to ensure accuracy. The survey began with mission planning to identify optimal satellite visibility and minimize Position Dilution of Precision (PDOP). A geodetic control point...
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GPS surveying methods vary in application, accuracy, and data collection techniques, catering to diverse surveying and mapping needs. Static GPS, kinematic GPS, and real-time kinematic (RTK) surveying are widely used. Each technique offers distinct advantages.Static GPS involves placing one receiver at a known reference point and another at the target point. It collects exact positional data by observing multiple satellite ranges over an extended period, achieving centimeter-level accuracy for...
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Related Experiment Video

Updated: Nov 10, 2025

Use of Principal Components for Scaling Up Topographic Models to Map Soil Redistribution and Soil Organic Carbon
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Evaluating the Ability of Multi-Sensor Techniques to Capture Topographic Complexity.

Hannah M Cooper1, Thad Wasklewicz1, Zhen Zhu2

  • 1Department of Geography, Planning, and Environment, East Carolina University, Greenville, NC 27858, USA.

Sensors (Basel, Switzerland)
|April 3, 2021
PubMed
Summary
This summary is machine-generated.

This study evaluated small unmanned aerial systems (sUAS) and lidar sensors for topographic mapping. The MaRS system demonstrated superior precision and performance in complex terrain, offering valuable insights for sensor selection.

Keywords:
OBIAUASlidarprecisionstructure-from-motionterrestrial laser scanning

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Area of Science:

  • Geomatics
  • Remote Sensing
  • Photogrammetry

Background:

  • Accurate topographic data is crucial for various environmental and engineering applications.
  • Small unmanned aerial systems (sUAS) offer a cost-effective platform for high-resolution topographic data acquisition.
  • Evaluating sensor precision and terrain complexity capture is essential for optimal platform selection.

Purpose of the Study:

  • To evaluate the precision and topographic complexity capture capabilities of multiple sensors, including small unmanned aerial systems (sUAS) and lidar.
  • To compare the performance of seven different sensor platforms against real-world surface measurements.
  • To provide insights into the cost-benefit analysis of various sUAS and sensor options for high-definition topography.

Main Methods:

  • Utilized five different small unmanned aerial systems (sUAS) with varying cameras, Global Navigation Satellite Systems (GNSS), and Inertial Measurement Units (IMU).
  • Integrated lidar sensors on a large sUAS and as a mobile scanning system.
  • Employed rigorous field and photogrammetric workflows, including structure-from-motion, Monte Carlo simulations, object-based image analysis, and the MC32-PM algorithm for quality assessment.
  • Compared sensor data against real-time kinematic (RTK)-GNSS and terrestrial laser scanning measurements.

Main Results:

  • Sensor precision varied, with the MaRS system (Sony A7iii camera) achieving the highest precision (0.11 m) and the Mavic2 Pro the lowest (0.225 m).
  • In heterogeneous terrain, only three platforms (MaRS, Inspire 2, Phantom 4 Pro) performed well.
  • All mobile sensors performed better in homogenous terrain, though sUAS and mobile lidar exhibited the most noise.

Conclusions:

  • The MaRS platform, equipped with a Sony A7iii camera, demonstrated superior performance in capturing high-definition topography, particularly in challenging terrain.
  • Sensor selection significantly impacts topographic data accuracy and cost-effectiveness.
  • Findings guide informed purchasing decisions for sUAS and sensors based on specific project requirements and terrain conditions.