Exclude a Smaller Area from a Larger Surrounding Area

In most earthwork jobs, every area is typically completely enclosed by a site perimeter. A site perimeter may contain several areas representing phases of the project.

Each phase of the project may itself contain several different areas—for example, a parking lot. The parking lot may in turn contain a building pad and several landscape areas. The building pad may have a smaller basement area. As this example demonstrates, it is likely that you will encounter a situation that involves digitizing enclosed areas.

For details on excluding a smaller area from a larger surrounding area, see Exclude Interior Areas.

Area Properties of Overlapping or Enclosed Areas

With enclosed or overlapping areas, the default behavior is to use the area properties of the smaller area, and not to apply the properties of the larger area to the smaller ones.

For example, if the parking lot referenced above has 3" of asphalt, and the landscaping areas (which are enclosed within the parking lot) have 6" of topsoil replaced, the landscaping areas will not have 3" of asphalt. Instead, they will have only 6" of topsoil. Similarly, if the building pad area has 4" of concrete, there will be 4" of concrete and no asphalt—despite the fact that the surrounding area’s properties call for asphalt. The only area that will have 3" of asphalt is the parking lot itself, since that is specified in the parking lot’s area properties. The same behavior applies to any grade changes.

Override the Default Behavior

For areas like phase perimeters (which should not affect the elevations and materials in the overlapped areas), you can open the area’s Area Properties popup window and select the Use surrounding area’s grade properties checkbox. This will give you a total of the quantities inside the phase perimeter area without affecting any overlapped areas.

Other areas may adjust to the surrounding area’s properties. A basement with a smaller area than the surrounding building pad, for example, can be lowered from the subgrade of the surrounding building pad. You can do this by opening the basement’s Area Properties popup window and selecting that this area’s elevation(s) are relative to the Surrounding Area’s Subgrade.

Adjacent Areas

Some areas should not overlap—for example, a sidewalk should not overlap the road adjacent to it. Since the sidewalk area is smaller than the road area, if any overlap were to occur, the area inside both the road and the sidewalk will use the sidewalk’s area properties. Your calculations will still be correct; however, when you view the road subtotals from within the Summary tab, you can specify whether the part of the sidewalk that overlaps the road should be included in the road’s subtotals. Situations like this are best handled using Snap to create adjacent areas that do not overlap. See Snap for more information.

Topsoil Strip and Replace From One Site Perimeter

You can now strip and replace topsoil in one site perimeter. Viewpoint Estimating automatically excludes any buildings, parking lots, or other areas from the area in which topsoil stripping or replacing will occur. If any of the interior areas should have topsoil stripped or replaced, you can simply enter the thickness of topsoil to strip or replace in the interior area.

Topsoil stripping excludes any existing areas. Topsoil replacing excludes any proposed areas.

How the Summary Tab Fits In

The Summary tab is used to view calculated quantities. The most common use is to view the totals for the entire site perimeter, including all areas inside it. By default, the site perimeter will include all enclosed areas. This setting can be changed either by opening the Area Properties popup window for a given area and selecting the Include enclosed areas checkbox or by setting the enclosed areas to Included in the Summary tab.

Other areas exclude enclosed areas by default. For example, the parking lot referred to earlier will by default exclude the landscaping areas, as well as the building pad. The Summary tab will display the area, cut and fill, and materials from the parking lot only. If you want to get the sum of the parking lot and its enclosed landscaping areas and building pad, you can select the Include enclosed areas checkbox in the Area Properties popup window or set the enclosed areas to Included in the View Total Quantities.