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Maps, GPS and Google Earth
Google Earth ruler question
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<blockquote data-quote="KTEagle" data-source="post: 993670" data-attributes="member: 84037"><p>I beg to differ with NomadPilot's answer... I've measured multiple locations I'm familiar with where there's significant incline. In some areas it measure 350 Yards of Map Length and 450 Yards of Ground length. Based on those observations I would assert that Map Length is the distance point to point (not accounting for altitude changes), whereas Ground Length is the literal distance point to point (an approximation of what you would get should you measure the distance using a Range finder.</p><p> </p><p>So, if you don't have a elevation compensating range finder but you know where you'll be shooting you can use Google Earth to tell you the Map Length (which is what you should use when attempting to compensate for elevation changes). As elevation over a fixed flight path length the Actual horizontal distance DECREASES. If you doubt it consider shooting 300 yards straight up or down, How much will the bullet drop... zero. Consequently, when shooting with Map Length of 350 and Ground Length of 450 the holdover should be at 350 even though the total bullet travel will be 450 yards.</p><p> </p><p>IMPORTANT NOTE!!! The ratio of Map to Ground IS affected by changing the ELEVATION EXAGERATION (should be se to 1 in order to get an accurate measure).</p></blockquote><p></p>
[QUOTE="KTEagle, post: 993670, member: 84037"] I beg to differ with NomadPilot's answer... I've measured multiple locations I'm familiar with where there's significant incline. In some areas it measure 350 Yards of Map Length and 450 Yards of Ground length. Based on those observations I would assert that Map Length is the distance point to point (not accounting for altitude changes), whereas Ground Length is the literal distance point to point (an approximation of what you would get should you measure the distance using a Range finder. So, if you don't have a elevation compensating range finder but you know where you'll be shooting you can use Google Earth to tell you the Map Length (which is what you should use when attempting to compensate for elevation changes). As elevation over a fixed flight path length the Actual horizontal distance DECREASES. If you doubt it consider shooting 300 yards straight up or down, How much will the bullet drop... zero. Consequently, when shooting with Map Length of 350 and Ground Length of 450 the holdover should be at 350 even though the total bullet travel will be 450 yards. IMPORTANT NOTE!!! The ratio of Map to Ground IS affected by changing the ELEVATION EXAGERATION (should be se to 1 in order to get an accurate measure). [/QUOTE]
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Google Earth ruler question
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