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Grids And Coordinates

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Latitude lines run east-west and are parallel to each other. If you go further north north, latitude values increase. Finally, latitude values (Y-values) range between -90 and +90 degrees

But longitude lines run north-south. They converge at the poles. And its X-coordinates are between -180 and +180 degrees.

Latitude and longitude coordinates make up our geographic coordinate system.

Map Coordinate Systems You can give anything on Earth latitude and longitude coordinates.

The field of study that measures the shape and size of the Earth is geodesy. Geodesists use coordinate reference systems such as WGS84, NAD27 and NAD83. In each coordinate system, geodists use mathematics to give each position on Earth a unique coordinate.

A geographic coordinate system defines two-dimensional coordinates based on the Earth’s surface. It has an angular unit of measure, prime meridian and datum (which contains the spheroid).

As shown in the image below, lines of longitude have X-coordinates between -180 and +180 degrees.

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Grid Services for E-Archaeology

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Abstract

Archaeological data collection is based on the description of archaeological contexts. An archaeological excavation demolishes the original matrix within which the cultural material is found and special care is taken to record spatial context. Each artifact is described in terms of its physical and spatial properties as well as its relation to the matrix (for example soil composition). As several thousands of artifacts can be unearthed during a field season, there is a need to develop digital resources and collections that focus on the publication and preservation of data and the creation of tools for the analysis of these data. The first section of this paper presents preliminary results and the lessons learnt on the development of a prototype for an Australian archaeological digital collection based on data grid middleware and infrastructure. The second section introduces a versatile 3D reconstruction tool that visualizes the excavated archaeological artifacts with its associated stratigraphy. The data come from two major archaeological projects in Queensland, Australia: the Mill Point Archaeological...

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