Approximate Methods of Linear Measurement.pptx

Various methods of linear measurement

1. Approximate Methods of Linear Measurement Here are some approximate methods for linear measurement in surveying: Pacing : Counting steps to estimate distance. Low accuracy; good for rough estimates. Odometer Wheel : Measures distance by counting wheel rotations. Moderate accuracy; affected by terrain. Tachymetry (Stadia Method) : Uses a theodolite and stadia rod to estimate distance. Moderate accuracy. Passometer (Pedometer) : Worn on the body, counts steps based on average step length. Low to moderate accuracy. Chaining by Approximate Alignment : Uses a chain or tape without precise alignment. Moderate accuracy; quicker method. Optical Rangefinder : Handheld device that estimates distance using optics. Moderate accuracy. Pacing with GPS Assist : Combines pacing with GPS for distance estimation. Moderate to high accuracy, depending on GPS.