**Adding / Importing GCPs:**

1. On the Menu bar, click **Project > GCP/MTP Manager****...**2. Select the

*GCP Coordinate System*: How to select / change the Image / GCP / Output Coordinate System.

**3. Open the**

*rayCloud*:

*From the Menu bar, click*

**View > rayCloud.**The rayCloud opens and the Automatic Tie Points appear.

4. On the 3D View, click on one point that approaches the GCP position.

5. On the right sidebar, in the *Images* section, the GCP area should appear in the displayed images. If not, click another point on the 3D View that approaches better the GCP area.

6. Click ** ****New Tie Point**.

The *Selection* section in the right sidebar displays information about the New Tie Point:

7. Edit the point's properties:

- (optional) Change the
*Label*of the GCP:

1. Click the *Label* cell of the point.

2. Type the desired name.

- Change the
*Type*of the point:

1. From the drop down list select:

**2D GCP:**If only the X,Y or Latitude,Longitude coordinates of the GCP are known.**3D GCP:**If the X,Y,Z or Latitude, Longitude, Altitude coordinates of the GCP are known.**Check Point:**If the X,Y,Z or Latitude, Longitude, Altitude coordinates of the GCP are known. A*Check point*is not taken into account during processing and indicates the accuracy around the areas where it is defined.

- Insert the coordinates of the GCP (for 2D GCPs and 3D GCPs):

1. Click the coordinates cells of the point (*Latitude, Longitude, Altitude* or *X,Y,Z*).

2. Type the corresponding coordinates.

- (optional) Insert the Accuracy (for 2D GCP
*Horizontal Accuracy*, and for 3D GCP Horizontal*Accuracy*and/or*Vertical Accuracy*):

1. Click the *Horizontal Accuracy / Vertical Accuracy *cell of the point.

2. Type the *Accuracy* of the point:

- For very accurate GCP, insert a low accuracy value.
- For non accurate GCP, insert a high accuracy value.

For more information about the GCP table properties: GCP / Manual Tie Point Table.

8. Click **Apply**.

9. Repeat steps 4 to 8 for other GCPs.

**Marking GCPs: **

Follow the steps 4 to 11 of this article (Mark GCPs -> using the rayCloud): How to import and mark ground control points (GCPs).

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