Fieldwork No. 4 - DIFFERENTIAL LEVELING

INTRODUCTION:

Differential leveling is the process of measuring vertical distances from a known elevation point to determine elevations of unknown points. The most common methods to determine elevation are through the use of 1) a compensator type, automatic (engineering level) and level rod(s), and 2) an electronic digital barcode leveling instrument with barcode rod. A thorough knowledge of leveling principles and proper application of methods and equipment will prevent costly delays and generate the needed results and accuracy.

Preferred methods of obtaining elevations (in order of preference/accuracy) are:
• Differential Leveling - control bench marks, cross-sections, point elevations
• Trigonometric Leveling - for Digital Terrain Model (DTM), 3D Model
• Indirect leveling (and location) by measuring horizontal distances and vertical angles
• Three-dimensional coordinates - both horizontal position and elevation are computed by processing the measurements
• GPS survey - given the appropriate equipment, procedure and data collection.

Presented by:
BSCE - 2E
Dalisay, Jester
Del Rosario, Monica
Iso, Khen Britney
Lopez, Patricia
Orcullo, Mark Joshua

Presented to:
Engr. Larry Galvez, MBA
Fundamentals of Surveying, Field

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