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Abstract
Comparison of Linear and Quadratic Transformations in Rubber Sheet operations:
A study using KVR 3000 data.
Sonal Khanolkar
Department of Geology,
Email: sonal.k.12@gmail.com
Hrishikesh Samant
St. Xavier’s College, Mumbai
In this paper the KVR 3000 imagery has been rubber sheeted using Linear and Quadratic transformations separately and the accuracy of each has been compared. For comparison 30 Ground Control Points have been chosen from the South Mumbai (18.083°, 72.836°) imagery. The latitude and longitude readings were acquired using a GARMIN 12 GPS. It is a 12 parallel channel GPS. The resolution of the satellite imagery chosen is 2 meters. The software used for georeferencing is IDRISI Kilimanjaro. The accuracy analysis has been carried out by two methods:
1) Comparison of the RMS error found by Linear and Quadratic transformations.
2) Comparison of coordinates of certain places on the georeferenced imagery other than the Ground Control Points to the actual Ground Data acquired by GPS.
By performing both the accuracy analysis tests it was proved that rubber sheeting or georeferencing using Quadratic Transformation yields a more accurate result than Linear Transformations in this case study.
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