Standard Topo Layers

The list of layers below includes our standard topography layers, which will be automatically included in every project when you select “Topo” or “2D + Topo” in the order form during project check-out.

Major and Minor Contours (009)

AirWorks Layer Name	G-TOPO-MAJR G-TOPO-MINR
What’s included/ classified?	Graduating lines depicting changes in elevation.
How it’s drafted?	Polylines labeled along elevation at intervals as determined by the contour interval. Built from ground segmented point cloud. We interpolate through obstructions over a short distance (i.e. under Vegetation).
Split Layer Option	None
Example
Input data format	.las
Input data quality requirements	1’/5′ (minor/major) RMSEz – 0.32′ min GSD Source Imagery – 0.32′ min, 0.16′ recommended 2’/10′ (minor/major) RMSEz – 0.65′ min GSD Source Imagery – 0.65′ min, 0.32′ recommended

Obstruction (019)

AirWorks Layer Name	A-OBSTRUCTION
What’s included/classified?	Areas obstructing ground segmentation. All large “no data” regions in the ground classified point cloud. Note: Water will return data but is removed from the ground classified point cloud.
How it’s drafted?	Closed polyline labeled at the outside edge of the ‘no data’ region in the ground classified point cloud. A radius of 5 pixels (more than 10×10 pixels wide) is shown on the layer.
Split Layer Option	None
Example
Input data format	.las
Input data quality requirements	GSD Source Imagery 0.65′ min 0.32′ recommended