Natural Earth is a public domain map dataset available at 1:10m, 1:50m, and 1:110 million scales. Featuring tightly integrated vector and raster data, with Natural Earth you can make a variety of visually pleasing, well-crafted maps with cartography or GIS software.
JOSM goes multi data layer July 18th, 2007 The latest JOSM now supports multiple data layers again. This was requested since about the day after I removed the feature over a year ago ;-) . As another big data source hits the main database (AND’s nethe
S. Sun, S. Prasher, and X. Zhou. Conceptual Modeling for Advanced Application Domains, volume 3289 of Lecture Notes in Computer Science, Springer Berlin Heidelberg, (2004)
M. Hampe, M. Sester, and L. Harrie. ISPRS Congrese, volume XXXV of International Archives of Photogrammetry, Remote Sensing and Spatial Information Sciences, page 135-140. Lund University, Dept of Physical Geography and Ecosystem Science, (2004)