New maps from old - gridding the seychelles outer Islands photomaps

Abstract

This paper describes a task that might appear unremarkable but which, in fact, was quite unusual and may have applications in other island states. The Seychelles Government required that the uncontrolled photomaps of its south western islands be placed on WGS72 Datum and gridded, in connection with the definition of the Seychelles' Exclusive Economic Zone. The construction of the original photomaps, the Doppler survey and the application of UTM grid to the Edition 2 photomaps are described.