DataSetInfo.EstimatedMaxScale Property
Gets or sets an estimate of the maximal appropriate view scale to display the data.
Syntax
public System.Double EstimatedMaxScale { get; set; }Property Value
Default: 0.0
An estimate of the maximal appropriate view scale to display the data.
Remarks
This estimate can be assigned to the Layer.MaxScale in the layer that displays the data, to disable the layer at more zoomed-out scales, where too much data would be retrieved.
Data formats with arbitrary overviews (JPEG2000, ECW, MrSID, RaveGeo) will get a large number as estimated max scale.
For vector data without overviews, the estimated max scale is usually twice the EstimatedScale, which itself is often a coarse estimate, but which is correct for some vector data formats, for example VPF.
For raster data with fixed built-in overviews, the estimate will be based on the resolution of the coarsest built-in overview level. Of course, for raster data without any built-in overviews, the estimate will based on the main data resolution.
For raster data, if there are child nodes with very different estimated max scales, it is best to divide the data into smaller separate portions, which can be displayed via several datasets and layers.
For vector data, child nodes with different estimated max scales are more expected, due to different data density in different files.
A value of zero for this scale is of course not useful, and means that a sensible value could not be calculated.
Platforms
Windows, Linux, Android