org.deegree.services.wms.capabilities
Interface ScaleHint

All Known Implementing Classes:

ScaleHint_Impl

public interface ScaleHint

Layers may include a element that suggests minimum and maximum scales for which it is appropriate to display this layer. Because WMS output is destined for output devices of arbitrary size and resolution, the usual definition of scale as the ratio of map size to real-world size is not appropriate here. The following definition of Scale Hint is recommended. Consider a hypothetical map with a given Bounding Box, width and height. The central pixel of that map (or the pixel just to the northwest of center) will have some size, which can be expressed as the ground distance in meters of the southwest to northeast diagonal of that pixel. The two values in ScaleHint are the minimum and maximum recommended values of that diagonal. It is recognized that this definition is not geodetically precise, but at the same time the hope is that by including it conventions will develop that can be later specified more clearly.

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Version:

2002-03-01

Author:

Andreas Poth

Method Summary

double	getMax() returns the maximum scale for which a layer is defined
double	getMin() returns the minimum scale for which a layer is defined

Method Detail

getMin

public double getMin()

returns the minimum scale for which a layer is defined

getMax

public double getMax()

returns the maximum scale for which a layer is defined