# Semi-Automated 3D Measurement Functions

This page describes Semi-Automated Measurements only.

For more information on 3D Measurements, see Measure.

## Concepts

Semi-automated measurement functions or Detectors require direct file access point cloud availability.

Detectors are designed to extract features based on their known properties. Understanding of how certain object will be represented in the point cloud allows to extract it with just a few clicks. The characteristic used can be: geometry of the object, reflectivity, colour or any combination of the above.

**Point Cloud Resource **

Detectors analyze a point cloud dataset, opened as a simple resource, as part of a compound resource (MM and UAS Runs or Oblique Project) or as part of a Project. The results can be saved into a vector dataset or theme of the corresponding type.

Point Cloud resources must be optimized into an Orbit Point Cloud. If needed merge and optimize multiple Point Cloud resources into a single resource, see Orbit Point Cloud and Optimize Data.

**Detector Parameters**

Each semi-automatic measurement technique has its corresponding set of parameters. Those can be changed according to the point cloud properties and quality to obtain a better result. Also the output preferences can be modified here. The algorithm parameters and output settings can be changed from the Preferences.

For use cases on adjusting parameters see Use cases adjusting Parameters for Detectors.

**Feature Detection Formulas**

Semi-automatic measurements show a limited list of results in the measurement sidebar. More Feature Detection results can be added as attributes into a vector dataset or theme of the corresponding type. Consult the Attribute Formulas to have a full overview of the available FD Formulas.

## Functions

### Points

**Pole Attachments with 1 click**

How to measure : (1) point on the pole.

Results : xyz coordinates, height of the pole, number of attachments.

**Tree with 1 click**

How to measure : (1) point on the stalk.

Results : xyz coordinates, height of the tree.

### Line

**Ridge with 1 point**

Auto completed ridge measurement.

How to measure : Option 1: Any point on ridge.
Results : xyz, xy and z length.

**Multiple ridges**

Auto completed multiple ridges measurement.

How to measure : (1) Any point on first ridge. (2) Any point on second ridge. (3) Any point on third ridge. … (n) Double click to end measurement on the last ridge that should be measured.

Results : xyz, xy and z length.

**Rail with 3 points**

Auto completed rail measurement.

How to measure : (1) Any point on rail 1, (2) 2nd point on rail 1, (3) Any point on rail 2.

Results : xyz, xy and z length.

** Road mark with 2 points **

Auto completed solid road markings measurement.

Conditions : Point cloud must include values for intensity.

How to measure : (1) Start point, (2) Direction point to auto-complete road marking.

Results : xyz, xy and z length.

**Road mark with 3 points**

Auto completed dashed road markings measurement.

Conditions : Point cloud must include values for intensity.

How to measure : (1) Start point 1st dash, (2) End point 1st dash, (3) End point 1st gap (equals start point 2nd dash).

Results : xyz, xy and z length.

**Fence with 1 point**

Auto completed top of fence measurement.
How to measure : (1) Any point on top of fence.
Results : xyz, xy and z length.

**Color separation line with 1 point**

Auto completed color separation line measurement.

Conditions : Point cloud must include values for RGB.

How to measure : (1) Any point on separation line between two areas with different colors.

Results : xyz, xy and z length.

**Guardrail with 1 point**

Auto completed guardrail detection.

Conditions : This is a linear reference measurement. This option should be enabled in Preferences of 3D Hover and Measurements and a linear vector file should be available in the workspace.

How to measure :

- Option 1: Click on the guard rail in the point cloud.
- Option 2: Create a slice view (see Slice View) through the guard rail, select the guard rail by moving the rectangle over it and click.

It is advised to use option 2 because this is a more controlled measurement.

Parameters for the guardrail detection can be changed in the Detectors Preferences.

Results : xyz, xy and z length.

### Catenary

**Catenary Curve with 1 point**

Catenary curve measurement.

How to measure : (1) Any point on catenary curve. Combine with <Ctrl> to measure all parallel wires between two poles.

Results : Distance over curve, clearance and span.

**Catenary Curve to horizontal reference plane**

Catenary curve and lowest clearance measurement.

How to measure : (1) Ground reference point, (2) Any point on catenary curve.

Results : Distance over curve, clearance and span, x,y,z.

### Area

**Crosswalk**

How to measure : (1) First stripe of crosswalk, (2) Last stripe of crosswalk.

Parameters for the crosswalk detection can be changed in the Detectors Preferences.

Results : area xyz, area xy.

### Boxes

** Box with 4 clicks**

How to measure : (1) First point on horizontal segment xyz, (2) Second point on horizontal segment xy, (3) Point on opposite horizontal segment xy, (4) Height of volume z.

** Box with 3 clicks**

How to measure : (1) First point on horizontal segment xyz, (2) Second point on horizontal segment xy, (3) Center of opposite horizontal segment xyz.

** Box with 2 clicks**

How to measure : (1) Center point of horizontal plane xyz, (2) Center point of segment xy. Set the fixed width and height in de Detector Preferences.

** Box with 1 click**

How to measure : (1) Center point of horizontal plane xyz. Set the fixed width, height and axis in de Detector Preferences.

** Box with 3 clicks and Z-range**

How to measure : (1) First point on horizontal segment xyz, (2) Second point on horizontal segment xy, (3) Point on opposite horizontal segment xy. The Z-range is defined by dropping the plane to the ground height.

draw area on ground and make height to highest poin

** Box with 1 click and Z-range**

How to measure : (1) Center point of horizontal plane xyz, Set the fixed width and height in de Detector Preferences. The Z-range is defined by dropping the plane to the ground height.

Search for lowest & highest point for height