tin in gis
TRANSCRIPT
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Triangulated Irregular Network (TIN)
ROHIT KUMARGEO-INFORMATICSCUJ/I/2013/IGIO/26
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DEFINATION
• TIN is a set of adjacent, non-overlapping triangles computed from irregularly spaced points, with x, y horizontal coordinates and z vertical elevations.
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Advantages & Disadvantages
• Advantages– Can capture significant slope features (ridges, etc)– Efficient since require few triangles in flat areas.– Easy for certain analyses: slope, aspect, volume.
• Disadvantages– Analysis involving comparison with other layers difficult.
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• TINs– are the most useful method for representing a continuous
surface in a vector GIS system.– data sets comprising any combination of contours,
breaklines and point elevations (either DEM or massed points) can be combined as input to create a TIN
• TINS are especially useful for analytical purposes • Good model for representing surfaces
• slope and aspect easily derived
• simplify the calculation of surface area and volume
TIN as a Storage Method
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Tin Triangles in 3-D
(x3, y3, z3)
(x1, y1, z1) (x2, y2, z2)
x
y
z
Projection in (x,y) plane
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Inputs for Creating a TIN
Mass Points Soft Breaklines Hard Breaklines
• Hard breaklines define locations of abrupt surface change (e.g. streams, ridges, road kerbs, building footprints, dams)• Soft breaklines are used to ensure that known z values along a linear feature are maintained in the tin.
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A Portion of the TIN
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Input Data for this Portion
Mass Points
Soft Breaklines
Hard Breaklines
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TIN Vertices and Triangles
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TIN Surface Model
WallerCreek
Street andBridge
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3-D Scene
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3-D Scene with Buildings
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THE END
THANK YOU