Arc Extract Breakline from DEM: Difference between revisions
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This page outlines the method used to take a line feature class, and extract elevations from DEM for input to TUFLOW breaklines. This is useful if you have a hydraulic control, for example a road embankment that you want to ensure is represented in the model. In this method the elevations will be extracted from the DEM. If detailed survey exists this should be used. This can also be used to process a thalweg / creek centre line.
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TUFLOW breaklines (2d Z Shape), are a mixture of line and point feature classes. This allows points to be deleted, without deleting the vertices along the line
'''Method 1'''
Using the TUFLOW utilities.
The next two methods are processed within Arc and the general process is to convert a line feature class, to a point feature class and extracting the elevation. Is a multiple step process and we are looking to implement a python script to automate this.
'''Method 2'''
# Convert line vertices to points
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The steps involved in each method are detailed below.
=Method 1 (TUFLOW
The asc_to_asc.exe can be used to extract elevations using the method outlined in the following page [[ASC_to_ASC#Extract_Breaklines_from_DEM | asc_to_asc.exe]]. DEM will need to be exported in either the .asc or .flt format. This gives user control over the method for inspection and can insert additional vertice along the line.
=Method 2 (point inspection)=▼
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<li>The first step is to create a point feature class from the line, to do this follow the method outlined in the <u>[[Arc_Lines_to_Points | convert lines to points tip.]]</u></li>
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=Method 3 (
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<li>As with the method above, the first step is to create a point feature class from the line, to do this follow the method outlined in the <u>[[Arc_Lines_to_Points | convert lines to points tip.]]</u></li>
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<li>In the buffer dialogue, set the input layer as the newly created points (step 1). Set the output file (this is a temporary table and will not be used as an input to TUFLOW). Set the distance type to linear and set the required distance. This distance will depend on the width of the feature you are trying to represent and the TUFLOW cell size.</li>
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