#Rasters to multipatch trial#

Precision defines the precision of the grid used in the To evaluate whether the regularized feature is straight or (which was 0.5 meters in this exercise) is a good choice in mostĭensification determines the sampling interval that is used Tolerance is the maximum distance that the regularizedįootprint can deviate from the boundary of its originating feature.Ĭhoosing approximately twice the size of the original raster cell Although you won't do it in this exercise, one option is to run the tool twice, each time with a different setting and with different buildings selected. Other options, such as Any Angles, can do a better job for large buildings with complex architecture but may fail to fully simplify the smaller, simpler buildings. The Right Angles method focuses on creating buildings with clean right angles.

For Method, confirm it is set to Right Angles.

For Output Feature Class, type Building_Footprints.

For Input Features, choose Buildings_Clean.

In the Layer Properties window, under Classification Codes, turn on the 6 Building class, turn off all the others, and click OK.

When the process is complete, on the ribbon, on the LAS Dataset Layer tab, click LAS Points.

It is suggested to make a copy of a small study area of your data to determine the best parameters.

#Rasters to multipatch trial#

In this lesson, the parameter values were chosen by trial and error to get the maximum of points classified correctly as buildings, while minimizing the false positives. The Classification Method specifies whether points are categorized as buildings conservatively or aggressively. The Minimum Rooftop Height and Minimum Area parameters are important to make sure that a surface that is too low or too small in area is not mistakenly classified as a building. In contrast, an area with trees may have several returns per laser pulse because the light reaches and reflects from several levels in the foliage or even the ground. Among the unassigned points, the tool identifies solid surfaces where there was only one return per laser pulse.

It is important that the ground points be separated out before running the tool. The Classify LAS Building tool uses a combination of methods to identify the building points.