Polyline Operation

After drawing polyline, an Overlay layer is added to the Layer Control panel, Select the Overlay layer then LMC on a polyline in the workspace, it will be highlighted in red. Next, RMC on that polyline to display options as shown in Polyline Operation#Polyline Operation#Figure 1.

Properties: Selecting this option to set properties of the polyline as shown in Polyline Operation#Polyline Operation#Figure 2.

Translate: Polyline contains points, each point has X and Y coordinates. Selecting this option will change the point's coordinates by adding a value to the original X and Y coordinates. As a result, the polyline will be shifted. After selecting this option, the Specify Distances form will pop up as shown in Polyline Operation#Polyline Operation#Figure 3, enter two values in meters in the form (e.g -100,50) then click the OK button, the polyline will be shifted.

Rotate: Selecting this option to rotate the polyline. After selecting this option, the Specify Rotation form will pop up as shown in Polyline Operation#Polyline Operation#Figure 4, enter a rotation angle in degree in the form then click the OK button, the polyline will be rotated. The rotation angle can be a positive or negative value.

Copy to a Spline Layer: Selecting this option will copy that polyline to other splines layer. After selecting this option, the Select Layer form will pop up as shown in Polyline Operation#Polyline Operation#Figure 5. From the drop-down list, we can select <New Layer> or an available splines layer there.

Break Polyline: Selecting this option will break the polyline into two polylines.

Delete Segment: Selecting this option will remove a segment of the polyline.

Delete Polyline: Selecting this option will remove the polyline.

Delete Grid Elevations: Selecting this option to remove the elevation of the nodes which are inside of the polyline. Steps to use this option are described below.

Interpolate Grid Elevations: Selecting this option to interpolate the elevation of the nodes which are inside of the polyline.

Figure 1. Draw splines procedure.

Figure 2. Polyline Properties form.

Figure 3. Specify Distances form.

Figure 4. Specify Rotation form.

Figure 5. Select Layer form.

Delete Grid Elevations

Suppose that there is a grid with the node's elevation shown (Polyline Operation#Polyline Operation#Figure 6). To show grid elevation, RMC on the grid layer then select Show Labels/Bottom Elevation option.

Now we draw a polyline that is over the grid. After drawing a polyline, LMC on that polyline will be highlighted (It turns red). Then select the grid layer in the Layer Control by LMC on that layer. Next, move the cursor near to the polyline and then RMC to display options as shown in Polyline Operation#Polyline Operation#Figure 7.

RMC on the grid layer then select Show Labels/Bottom Elevation to update the node's elevation. As a result, the elevation of nodes that are inside the polyline is deleted and displayed with the NaN label as shown in Polyline Operation#Polyline Operation#Figure 8.

Figure 6. Grid with node's elevation shown.

Figure 7. Delete Grid Elevation option.

Figure 8. Grid Node's Elevation inside polyline deleted.