A few other tips and comments re using the old topographic maps: 1. The contours and heights are in feet: If you add a tag for elevation (height=???), remember to convert to meters. There are many trig beacons on mountain peaks that can be added. 2. Consider whether it is appropriate whether to use the data from a topographic map over 50 years old. It makes sense to do so for mountain peaks and many (but not all) rivers and streams). Use place names with discretion as so many have changed. It is often useful to use old topographic map in conjunction with satellite imagery. 3. Re-align the slippy map with GPS tracks whenever you move from one area to another. In JOSM use the plugin imageryadjust.
I have found some more old out of copyright maps that I am sending to Grant, which will be added in due course. Lance On Thu, 2011-08-11 at 12:55 +0100, Grant Slater wrote: > Hi Guys, > > With help from Lance, we have converted a large set of old, out of > copyright government topographic map sheets into a web slippy map. > > See them here: > http://grant.dev.openstreetmap.org/za-ooc-slippy/ > > The map sheets are mostly 1st edition from the 1940s and 1950s. No freeways! > > It is also possible to use these maps as source material in JOSM, > Potlatch 2 and Merkaartor > * JOSM: Preferences, WMS, Add imagery layer, type TMS. TMS url: > http://grant.dev.openstreetmap.org/za-ooc-slippy/ > * Potlatch 2: Click background (top left), click edit, add using URL: > http://grant.dev.openstreetmap.org/za-ooc-slippy/$z/$x/$y.png > > At the moment there are a few bugs, which I'll get around to fixing: > * Few misplaced sheets. e.g.: Richards Bay > * Pure black pixels are incorrectly set as transparent. > * Sheets are not trimmed to map only. (headers + borders + reference) > * Missing sheets... > > Would love to hear what you guys think or any suggestions... > > / Grant > > _______________________________________________ > Talk-ZA mailing list > [email protected] > http://lists.openstreetmap.org/listinfo/talk-za
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