ZHANG, Ruda July 10, 2018:  Add manifold learning [ba3d5e6]
Ruda Zhang February 07, 2017:  GRASS and QGIS data models. [0e3b290]
Ruda Zhang February 06, 2017:  GRASS GIS and its QGIS integration [eb3b14b]
Ruda Zhang January 19, 2017:  GpsPrune [0239a03]
Ruda Zhang January 08, 2017:  QGIS shortcuts [56c1ac1]
Ruda Zhang November 02, 2016:  OSM tools and icons. [b91491b]
Ruda Zhang October 24, 2016:  epsg:3857 vs World Mercator epsg:3395; qgis expressions [e9199cd]
Ruda Zhang July 05, 2016:  Add leaflet, QGIS; notes on decision trees. [9f2e957]