1:1000 scale maps : data capture and manipulation

Abstract

The scope of this study is to recommend some changes in the current procedures when processing the 1: 1000 map which is issued by the Mapping Unit, Planning Authority. Having experience in processing both the 1 :2500 map and the 1: 1000 map, helped in making comparisons, where possible, between the two procedures, enabling me to arrive to the desired recommendations. In the first chapter, some technical details, regarding aerial photographs and their interpretation in photogrammetry are introduced. This chapter is going to be useful to the reader as background information for the following chapters, and also to be able to position himself behind the stereo-plotter and understand the problems that may arise in data capturing. In fact, data capturing, as it is done at the Mapping Unit, is discussed and analysed in chapter two. This chapter take us through various stages; from ground control to actually plotting the data, and also discusses what features are being plotted and how. The following chapter, that is chapter three, goes through the process of the editing work done on the raw data after it is passed on from the photogrammetry section, as it is currently being done by the section. As one would notice, the process is a long one, having to go through site checking, editing the necessary data until finally the survey sheet is issued. Some changes that need to be implemented in the present process of the 1: 1000 mapping are described in chapter four. Changes are recommended at various stages of this process, such as photogrammetry, site checking and editing work These changes are derived from interviews made to some of the staff at the Mapping Unit. Two primary recommendations are discussed in detail in chapter five. If these are implemented, the 1:1000 map should be more consistent and faithful to the user, and more useful to both the Mapping section and its clients. Maps are included throughout this report to aid the reader in visualising the current problems and appreciate the recommendations made and the results which are achieved in this study.