Straight-grade existing COGO points.

Usage:

The SGRD command will straight-grade existing Cogo points between selected points. You may select an existing Cogo point for grading reference points, or you may pick a location and key an elevation.

You may also select an object - any line, arc, polyline, ellipse, or spline will work. If you select an object, then the grade is figured along the object. If you do not pick an object, the grade will be calculated on a line between the two reference points.

Example 1:

Consider the following diagram. We have desired grades on Points 150 and 159. We wish to use these points to straight-grade the existing points along the arc.

Start the SGRD command. Pick Points 150 and 159 at the prompts. Then select the arc as the grading object. Select all points. The result is as follows:

Note that points that are not on the grading object are given the grade of the closest point on the grading object. Objects just off of the end of the grading object have the elevation of the endpoint.

Example 2:

This is the same as Example 1, except this time no object is selected as the grading object. The SGRD command will draw a temporary line through the grading points to indicate the line it will use to calculate elevations. The grade is projected beyond the points selected.

See Also

l PT2ALIGN

Change elevation of selected COGO points to match an alignment FG profile.

l PT2SURF

Change elevation of selected COGO points to match a surface.

l PGRD

Create elevated COGO points along a polyline, line, arc, or spline, at any offset, and straigh-graded between spot elevations. Points are equally-spaced between grade breaks and horizontal breaks.

l XGRD

Grade COGO points based on cross-slopes calculated from selected points and an alignment FG profile.