User:Phaedrus86/sandbox

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 * template:coor dm -43.56667°N, 146.6°W
 * template:coor dms -42.62556°N, 148.08667°W - Maria Island

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Nasa Worldwind Measure Tool
Need confirmation of measurements. Above were taken from Nasa Worldwind, but I don't know how accurate that is. Checked Hobart airport - Wikipedia says 2200m, my measurement at 30,000m, 2256m, at 4365m, 2218 - pretty close. Hobart to Granton, 20km by road, is 16.7 direct - pretty close. Kingsford-Smith Airport Sydney main runway, Wikipedia says 3968m, I get 3936m - very close. I can't be sure I am measuring right points, so I need another check.

Compared distance on Tas govt The List map measured using grid coordinates between two points east and west of New Norfolk that are clearly identifiable on the map, and are close to the same latitude. These two points were 12,925 metres apart. Nasa Worldwind measure tool gives the same distance as 12.71Km. This is a difference of less than 1%. Checked grid map coordinates by zooming in to a scale of 1:160 (_very_ close up!). West point is E499020 N5266043, East point is E511930 N5265751. This gives a N/S difference of 292 metres, and E/W of 12,910 metres, hence 12.91Km. Worldwind measurement at altitude 13,876m is 12.7km, 27,812m same, 55,612 12.8, 111.37km 12.6 (getting too hard to see the points clearly. However even at altitude of 111 Km, error is still only 1%!! Error at altitude 13.9Km was 2%.

Note that Vertical Exaggeration in Worldwind is set to 0. If set above 1 it will introduce errors for points significantly above sea level. Shouldn't affect measurements here, but set to 0 anyway.

Multimap distance bar at bottom of map gives distances about 30% more. Checking distances on map against stated scale gives 1.65cm on screen at 1:200,000 for width of De Witt Island = 3.3 Km - pretty close. However distance bar at bottom shows 25 Km, but is 8.8cm long, giving 17.6 km, not 25! This is out by 30%, though the rest of the map is fine, at or very close to scale. The sample distance bar is the only thing out, and it appears to be out by a consistent 30% at different scales.

Apart from this, Multimap correlates closely with Worldwind and TheList measurements.

Used The List map to check Maatsuyker distances:
 * Maatsuyker - nearest point on mainland = 10.4km
 * Maatsuyker E/W distance = 1.235Km
 * Maatsuyker N/S = 2.52km
 * De Witt N/S 2.13 x E/W 3.2km
 * De Witt - mainland 5.99km - but it is hard to see where land is at nearest point, so 5.5 - 6.

Compared distance calculator at Geoscience Australia which works off gazetteer database, with Worldwind measure tool. South West Cape to South East Cape - GA = 64.4km, Worldwind at altitude 84Km = 64.8km.

Conclusion - Worldwind measure tool is quite accurate provided points measured can be accurately identified.

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