The 'Helmert transformation' in surveying is used to convert:
Choose the correct answer
Convert distances from metric to imperial
Transform 3D Cartesian coordinates between two datums (e.g., GPS WGS84 to local Everest datum) using 7 parameters
Calculate azimuths from latitude-longitude
Convert planimetric to volumetric coordinates
Correct Answer
B. Transform 3D Cartesian coordinates between two datums (e.g., GPS WGS84 to local Everest datum) using 7 parameters
AI Detailed Explanation & IS Code Reference
Unlock the reasoning, formula path and code-linked notes inside your student dashboard.
Helmert (7-parameter) transformation: converts coordinates from one Cartesian frame to another (e.g., WGS84 GPS coordinates to local datum like Everest India). Parameters: 3 translations (Tx, Ty, Tz), 3 rotations (Rx, Ry, Rz), 1 scale factor (s). Used when integrating GPS surveys with existing maps in local datums. 3-parameter (only translation) simpler but less accurate for large areas.
ScoreCardAI links this solution with subject, topic and difficulty signals so your scorecard can identify weak areas after a full mock test.
Practice more Civil Engineering questions
This MCQ belongs to JE Level Premium Test Series. Full tests include timed attempts, rank comparison and subject-wise analysis.