Sequence the steps for georeferencing a map in QGISz:

(A) Select transformation type

(B) Open the image to be georeferenced

(C) Open the map that you want to georeference

(D) Find ground control points

Choose the correct answer from the options given below:

Correct option is D

Explanation of the Correct Option (d): (C), (B), (D), (A)
· (C) Open the map that you want to georeference
· First, the reference map (already georeferenced layer) must be loaded in QGIS.
· This acts as the spatial reference for assigning coordinates.
· (B) Open the image to be georeferenced
· The scanned map or image without coordinates is opened in the Georeferencer tool.
· (D) Find ground control points
· Ground Control Points (GCPs) are selected by matching locations on:
· The unreferenced image
· The reference map
· These points are essential for spatial alignment.
· (A) Select transformation type
· After placing GCPs, the transformation method (Linear, Helmert, Polynomial, etc.) is chosen.
· This final step performs the coordinate transformation.
Hence, the correct sequence is (C) → (B) → (D) → (A).
Explanation of Other Options
Option (a): (A), (B), (C), (D)
· Incorrect because:
· Transformation type cannot be selected before loading maps and GCPs.
Option (b): (A), (C), (B), (D)
· Incorrect because:
· Transformation selection comes after GCP identification.
Option (c): (B), (A), (D), (C)
· Incorrect because:
· Reference map must be opened before selecting GCPs.
Key Points Related to the Question
· Georeferencing assigns real-world coordinates to raster images
· Ground Control Points (GCPs) are crucial for accuracy
· QGIS Georeferencer supports multiple transformation methods
· Commonly used in:
· GIS mapping
· Remote sensing
· Land-use analysis