I have two polyline features. One which is on the ground surface and one below the ground surface on the exact same location. I want to generate height lines for each Vertex generated by the differences in Z-coordinates of the corresponding vertices of the 2 polyline features.
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How to generate height lines with the same X, Y only in the third dimension using differences in Z coordinates?
Best answer by markatsafe
@sibe For each line, you can use CoordinateConcatenator to generate a comma separated list of the Z values and then use AttributeSplitter to generate a list attribute. Aggregate the two lines. You can the pass the two list attributes into a short PythonCaller script - something along the lines off:
import fme
import fmeobjects
def processFeature(feature):
# initialize the python lists with FME lists
_Z1 = feature.getAttribute('_Z1{}')
_Z2 = feature.getAttribute('_Z2{}')
_diffZ = []
for i in range(len(_Z2)):
_diff = float(_Z2[i]) - float(_Z1[i])
_diffZ.append(_diff)
# output the FME lists
feature.setAttribute('_diffZ{}', _diffZ)Force the Geometry to 2D (2DForcer) and then use FMEFunctionCaller to call:
@ZValue(_diffZ{})as described by @Takashi Iijima here. For this to work your vertices have to line up, so you might have to use Intersector or Snapper before hand
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@sibe For each line, you can use CoordinateConcatenator to generate a comma separated list of the Z values and then use AttributeSplitter to generate a list attribute. Aggregate the two lines. You can the pass the two list attributes into a short PythonCaller script - something along the lines off:
import fme
import fmeobjects
def processFeature(feature):
# initialize the python lists with FME lists
_Z1 = feature.getAttribute('_Z1{}')
_Z2 = feature.getAttribute('_Z2{}')
_diffZ = []
for i in range(len(_Z2)):
_diff = float(_Z2[i]) - float(_Z1[i])
_diffZ.append(_diff)
# output the FME lists
feature.setAttribute('_diffZ{}', _diffZ)Force the Geometry to 2D (2DForcer) and then use FMEFunctionCaller to call:
@ZValue(_diffZ{})as described by @Takashi Iijima here. For this to work your vertices have to line up, so you might have to use Intersector or Snapper before hand