A line of a critical nature which describes the shape of an elevation surface and indicates a discontinuity in the slope of the surface (i.e. an abrupt change in gradient). Triangles included within a TIN model must never cross it.
-- Description --
SOURCE Adapted from [ISO 19107:2003].
EXAMPLE
Breaklines represent local ridges or depressions (streams or drainage lines) in the surface, man-made structures (e.g. roads), etc.
NOTE 1 A breakline connects points with different elevation and therefore its description using 2.5-D coordinates (using the 'geometry' attribute) is fully recommended.
NOTE 2 No triangle in a TIN may cross a breakline (in other words, breakline segments are enforced as triangle edges), even if doing so violates the triangulation criterion.
NOTE 3 All breaklines are located on the ground surface or on any of the artificial structures built on it.
NOTE 4 Breaklines are useful as input data for the generation of a more appropriate or accurate digital elevation model by using interpolation methods.
| Egenskap |
Stereotype |
Beskrivelse |
Type |
Multiplisitet |
| breakLineType |
|
-- Name --
break line type
|
BreakLineTypeValue |
1..1 |
| geometry |
|
-- Name --
geometry
|
GM_Curve |
1..1 |
| manMadeBreak |
voidable |
-- Name --
man-made break
|
Boolean |
1..1 |
| Navn |
Type |
Lengde |
Multiplisitet |
|
BreakLineTypeValue |
|
1..1 |
|
GM_Curve |
|
1..1 |
|
Boolean |
|
1..1 |
| Name |
Type |
English |
Description |
| breakLineType |
BreakLineTypeValue |
|
The type of break line with regard the natural or man-made real world characteristic it represents, or the specific function it has in calculating a Digital Elevation Model (DEM).
|
| geometry |
GM_Curve |
|
Represents the geometric properties of the spatial object.
|
| manMadeBreak |
Boolean |
|
Line which represents an elevation break due to an artificial or man-made construction present on the terrain.
|
