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Isn´t the arc-sec/inch value different for different parts of a chart?

April 26, 2017chart different inch value

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Isn´t the arc-sec/inch value different for different parts of a chart?

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The linear scale of any chart is exact only for the chart center, where the chart coordinates are specified. Because charts are projections of a spherical surface, some distortion results towards the edges of a chart. Charts that cover larger areas have correspondingly larger errors towards the edges.