depiction of relief
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Depiction of Relief. Interpreting Contours. Contour lines are continuous lines on the map that join points of the same height above sea level. On 1:50000 scale maps the contour interval is every 10m. - PowerPoint PPT PresentationTRANSCRIPT
Depiction of Depiction of ReliefRelief
Interpreting Interpreting ContoursContours
Rhys LlywelynRhys Llywelyn
Contour lines are continuous lines on Contour lines are continuous lines on the map that join points of the same the map that join points of the same
height above sea level.height above sea level.
Rhys Rhys LlywelynLlywelyn
On 1:50000 scale maps the contour On 1:50000 scale maps the contour interval is every 10minterval is every 10m
When you look at a map, you should try to interpret the contours and build up a 3 Dimensional picture in your mind of what the ground
actually looks like.Rhys Rhys
LlywelynLlywelyn
ContourContour FeaturesFeatures Closely packed contours indicate a steep slopeClosely packed contours indicate a steep slope Well spaced contours indicate a gentler slopeWell spaced contours indicate a gentler slope
Rhys Rhys LlywelynLlywelyn
There are four main features that we There are four main features that we use when navigating in the mountains.use when navigating in the mountains.
Also imagining that each feature has Also imagining that each feature has four sides that go either up or down four sides that go either up or down can help identify the feature on the can help identify the feature on the
ground.ground.
Top/SummitTop/Summit SpurSpur ColCol
Re-entrantRe-entrantRhys Rhys
LlywelynLlywelyn
Top/SummitTop/Summit
Contours Contours form a form a
completcomplete circlee circle
All four All four sides sides down.down.
Rhys Rhys LlywelynLlywelyn
SpurSpur
Contours are Contours are U or V U or V
shaped, shaped, pointing away pointing away from the high from the high
groundground
Three sides Three sides down and one down and one
up.up.Rhys Rhys
LlywelynLlywelyn
Col/SaddleCol/Saddle Two spurs Two spurs
pointing pointing towards towards each othereach other
Two opposite Two opposite sides up & sides up & other two other two down.down.
Rhys Rhys LlywelynLlywelyn
Re-entrantRe-entrant
Contours are U Contours are U or V shaped, or V shaped, but pointing but pointing towards the towards the high groundhigh ground
Three sides up Three sides up and one down.and one down.
Rhys Rhys LlywelynLlywelyn
Rhys Rhys LlywelynLlywelyn
Rhys Rhys LlywelynLlywelyn
Rhys Rhys LlywelynLlywelyn