Editing Navigation/Maps
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=== Purchasing Cautions === | === Purchasing Cautions === | ||
- | The maps have been updated in a sequence of numbered "editions", | + | The maps have been updated in a sequence of numbered "editions", shown in the lower right corner. The latest edition is usually Edition 2 or Edition 3. It's unusual to find an outdated edition being sold. |
For a few locations, especially national parks and the adjacent areas on the same map, a new edition has been created where the map elevations have been converted to metric. These are often Edition 4. Unfortunately when redrawing the contour lines, they have been computer interpolated, rather than replotted from the original (or new) aerial photographs. As a result there is less detail when examining the shape of the land. These maps have also been converted to WGS 84 (a good thing). In total, having the pre-metric earlier edition, if you can find it, would probably be better. | For a few locations, especially national parks and the adjacent areas on the same map, a new edition has been created where the map elevations have been converted to metric. These are often Edition 4. Unfortunately when redrawing the contour lines, they have been computer interpolated, rather than replotted from the original (or new) aerial photographs. As a result there is less detail when examining the shape of the land. These maps have also been converted to WGS 84 (a good thing). In total, having the pre-metric earlier edition, if you can find it, would probably be better. |