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VIEWSHED ANALYSIS

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on 21 February 2014

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Transcript of VIEWSHED ANALYSIS

Viewshed Theory
Applications for societal context
e.g.
Fire watchtowers in mountainous areas
Planning location of windmill parks

VIEWSHED ANALYSIS
Theory
CONTENT
VERA van zoest
SANDER van der drift
TOM bewernick
THIJS oosterhuis
JAN neumann
TIMO anker
RATIH nurhayati
BOUKE pieter ottow
Advantages and disadvantages


Viewshed computation is uncertain due to elevation errors (possible solution: generate spatial elevation errors with the Monte-Carlo analysis and add this to the true DEM)
Viewshed uncertainties are increased due to low resolution data
Advantages and disadvantages


Quick tool to find all observer points that can be seen from a location and vice versa
Useful to determine from what distance objects are still visible
Applications
Advantages / disadvantages
...The region visible to a viewer from a given point(s)

...Refers to line of sight, so this concept also holds true
for radar, cell phone reception
What do you need for analysis?
DEM converted to raster form
Shape file containing point or line
as observation points
-
+
Parameters
Applications in research
our group
Offset
Vertical angle
Azimuth
Radius
elevation
Honest comparison? Equal areas!
50x50 km
Resampled to cell size of 50m
Results DEM viewshed analysis
Conclusion
Defining viewpoints...
Calculating viewshed on eye level...
Calculating the visible percentage...
Calculating terrain characteristics...
VIEWSHEDS???
Standard deviation of elevation
Range
Mean Slope
What is the relation between land characteristics and visibility?
Where to start? At the peaks...
Number of sinks
Export results...
Conclusions
8 Unfilled DEMs
%
meters
%
%
%
%
GIS
Thanks for your attention!
Full transcript