Development of a Geo-spatial Analysis Methodology for Assessing the Adequacy of Hydrographic Surveying and Nautical Charts (original) (raw)
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sta.uwi.edu
The rationale for the effective management of natural resources in SIDS has been a subject of discussion in many fora in the last decade. The relatively fixed quantity and exposure of these resources to natural and human degradation are major concerns to the population at large. In an attempt to manage these resources in rational and sustainable ways, efforts have rightly been focussed on the development of legislative and policy instruments. These instruments have shown little-known results and their impact is sometimes difficult to assess. Improvements in information technology, in the last decade, have tremendously improved the capability of geoinformatics as a data acquisition, data analysis and data management tool. The introduction of high-resolution satellite imagery and high-precision Global Positioning Systems along with increased data processing power of GIS has provided efficient tools for resource management. This paper will review technological advancements that could improve the management of natural resources. Particular attention would be paid to the use of Geographic Information Systems (GIS) as a data analysis and modelling tool for a variety of spatial analyses and management. The paper concludes by proposing a strategic development plan for the effective use of GIS in land and marine management in SIDS.
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Chart adequacy and completeness information consists of the symbols, abbreviations and warnings used to inform mariners of the level of confidence that should be given to data on a nautical chart. This information is derived both from the nautical chart and sailing directions. However, analysis based solely on these datasets is limited without access to the sources (e.g., smooth sheets). Publically-available, multi-spectral satellite imagery and published algorithms can be used to derive estimates of the relative bathymetry in shallow, clear waters. In this study, we evaluate the potential of these methods for supplementing the procedure to assess the adequacy of hydrographic surveying and nautical charting coverage. Optically-derived bathymetry provides information in areas that have not been surveyed and monitor any seafloor changes that may have occurred since the last survey of the area. Preliminary results show that multi-spectral satellite remote sensing is also potentially beneficial as a reconnaissance tool prior to a hydrographic acoustic survey.
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Maps and nautical charts historically: two of a kind or different cartographic paradigms? (text)
2] Everybody knows that geographical maps and nautical charts are different. Not only they bear different names, which is a sign that they had different origins and evolutions, but also, they were devised and constructed for different purposes. The importance of focusing attention onto this subject is obvious: from the fifteenth and well into the eighteenth centuries, nautical charts were the single most important source of information for the construction of a coherent depiction of the Earth, typically in the form of world maps and printed atlases [*].
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