Device Parameters |
Terrain type (TT) |
Ridge | Valley. When "Ridge" is
selected, the "Edge Threshold" is set to 0.0; it is
automatically set to 1.0 when "Valley" is selected. |
Edge
Threshold (ET) |
The height threshold of axis
edges. For example, when TT = "Ridge", setting ET = 0.3
removes any ridge axis with a height less than 30% of
the maximum height of the current height field. |
Height Difference (HD) |
The height difference threshold of
neighboring sites. When the height difference between
two neighboring sites is less than HD, they are
considered by PPA as "equal" in height. The default is
0.05. |
Downsampling Rate (DR) |
The downsampling rate for the
resulting axis graph. The default is 5.0. |
End
Point Reduction (EPR) |
How many end segments to remove.
For example, setting EPR = 3 will remove 3 segments from
each end of all axes. The The default is 3. |
Short
Branch Threshold (SBT) |
The segment length threshold of a
branch, below which the branch is considered as "short"
and is removed from the final axis graph. For example,
setting SBT = 7 removes all branch with length less than
7 segments from the result.
The default is 7. |
Small
Group Threshold (SGT) |
The segment length threshold of a
group of isolated branches, below which the group is
considered as "small" and is removed from the
final axis graph. The larger the SGT is,
the less isolated islands of axes remain in the result.
The default is 10. |
Half
Profile Length (HPL) |
The number of profile points on
either side. The larger the HPL is, the more small
height variations are lost. The default is
3. |