Tips for Understanding Contour Lines http://geology.isu.edu/geostac/Field_Exercise/topomaps/topo_interp.htm
Vertical Scale http://geology.isu.edu/geostac/Field_Exercise/topomaps/vert_scale.htm
Vertical Exaggeration http://geology.isu.edu/geostac/Field_Exercise/topomaps/vert_ex.htm
Calculating a Slope http://geology.isu.edu/geostac/Field_Exercise/topomaps/slope_calc.htm
Contour lines http://geology.isu.edu/geostac/Field_Exercise/topomaps/topo_interp.htm
Elevation http://en.wikipedia.org/wiki/Elevation
http://raider.muc.edu/~mcnaugma/Topographic%20Maps/topomapindexpage.htm#Menu
เส้นชั้นความสูง http://survey.werthai.com/contouring.htm
Drawing a topographic profile
http://www.youtube.com/watch?v=X6uavZnHTuY&feature=related
Estimating Slope http://www.nwcg.gov/pms/pubs/475/PMS475_chap2b.pdf
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