Example Datasets Available for Download: Cadastre

Cadastre
The goal of this project is to generate the DSM and the Orthomosaic of a village using a Canon IXUS 120IS.
Densified Point Cloud 3D Textured Mesh Point Cloud - Terrain Point Cloud - Objects DTM Raster DSM Orthomosaic Grid DSM
   
Google Maps Tiles KML Pix4D Cloud Contour Lines Contour Lines - DTM 3D PDF    
General project information
Project
Location Switzerland
Average Ground Sampling Distance (GSD) 5.1 cm / 2 in
Area covered 0.2128 km2 / 21.2822 ha / 0.0822 sq. mi. / 52.6167 acres
Output coordinate system WGS84 / UTM zone 32N
Vertical Coordinate System: Geoid Height Above WGS 84 Ellipsoid = 0 meters
Image acquisition
UAV swinglet CAM (senseFly)
Image acquisition plan 1 flight, grid flight plan
Camera Canon IXUS 120IS (RGB)
Images
Number of images 70
Image size 4000x3000
Image geolocation coordinate system WGS84
GCPs
Number of GCPs 12 3D GCPs
GCPs coordinate system WGS84
Download* and project files

The dataset can be downloaded here.

The dataset can be found processed on Pix4D Cloud here

The downloaded folder contains the following files and folders: 

  • imagesRGB images in JPG format
  • inputs/gcp_overview: images that help to identify each GCPs
  • inputs/gcpPositionsLatLongAlt.csv: GCP input geolocation file.
  • example_cadastre.p4dproject file that can be opened in Pix4Dmapper.

*The usage of this dataset is meant to be for personal and professional training. If you would like to use it for commercial or promotional objectives, please be sure to mention "Courtesy of Pix4D / pix4d.com" linking all this text to pix4d.com.

Instructions

Follow the instructions to:

Process the dataset using the included .p4d project file

This section describes how to process the dataset in order to generate the DSM and the Orthomosaic of a village.

1. Open the project example_cadastre.p4d
2. On the Menu bar, click View > Processing. The Processing bar opens at the bottom of the main window.

 
Note: As the goal of this project is to generate the DSM and the Orthomosaic, and as it has been taken using aerial nadir images, the template used for the processing has been set to 3D Maps. This can be seen in Process > Processing Options....

3. On the Processing bar, click Start to start the processing.

Process the dataset creating a new project

This section describes how to create and process a project in order to generate the DSM and the Orthomosaic of a village.

A) Create a new project:

1. Start Pix4Dmapper.
2. On the Menu bar, click Project > New Project....
3. The New Project wizard opens.
4. In Name: Type a name for the project. In this example type example_cadastre.
5. (optional) In Create In: Click Browse, and in the Select Project Location pop-up, navigate to select the folder where the project and results will be stored and click Select Folder.

 
Note: When the project is created, a folder named after the project name typed in the Name field will be created in the selected folder and will store all the results. The .p4d project file will also be stored in this folder.

6. (optional) Select the check box Use As Default Project Location to save all new projects in the selected folder.
7. In the section Project Type, keep selected the default option New Project.
8. Click Next.

The New Project wizard displays the Select Images window.

9. Click Add Directories... and select the images folder to add the images to the project.
10. Click Next.

The New Project wizard displays the Image Properties window.  The image geolocation is automatically loaded from the image EXIF data. The coordinate system is automatically set to WGS84 with vertical coordinate system given in MSL egm96. As the image geolocation is given in WGS 84 with vertical coordinates system in Geoid Height Above WGS 84 Ellipsoid = 0, the coordinate system has to be changed.

11. On the Image Geolocation > Coodinate System click Edit...
12. On the Select Image Coordinate System window, select Known Coordinate System with coordinate system WGS 84.
13. On the Select Image Coordinate System window, select Advanced Coordinate Options, and under Vertical Coordinate System select Geoid Height Above WGS 84 Ellipsoid. Set the value to 0.
14. On the Select Image Coordinate System window, click OK

In the Image Properties window, the camera model is loaded from the camera model database (CanonDIGITALIXUS120IS_5.0_4000x3000 (RGB)).

15. Click Next.

The New Project wizard displays the Select Output Coordinate System window. By default the last output coordinate system selected in the software is selected.

16. Select Auto Detected.
17. Select Advanced Coordinate Options and under Vertical Coordinate System select Geoid Height Above WGS 84 Ellipsoid. Set the value to 0.
18. Click Next

The New Project wizard displays the Processing Options Template window. 

19. Click 3D Maps to select the template.

 
Note: As the goal of this project is to generate the DSM and the Orthomosaic, and as it has been taken using aerial nadir images, the template to be selected is the 3D Maps template.  

20. Click Finish to finish the wizard and create the project. The Processing window opens at the bottom of the main window.

 

B) Introduce and mark the GCPs:

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

The GCP/MTP Manager window opens. Change the GCP Coordinate System to be WGS 84 with a vertical coordinate system given by a Geoid Height Above WGS 84 Ellipsoid of 0 meters.

2. On the GCP Coordinate System section, click Edit....
3. On the Select GCP Coordinate System window, set the Unit to m
4. On the Select GCP Coordinate System window, select Known Coordinate System [m], type WGS 84 and select it in the drop-down list.
5. On the Select GCP Coordinate System window, select Advanced Coordinate Options and under Vertical Coordinate System select Geoid Height Above WGS 84 Ellipsoid. Set the value to 0.
6. On the Select GCP Coordinate System window, click OK.
7. On the GCP/MTP Manager window, on the GCP/MTP Table, click Import GCPs....
8. On the Import Ground Control Points window, under Coordinates Order, select Latitude, Longitude, Altitude (default). 
9. On the Import Ground Control Points windows, click  Browse, select the GCPs file gcpPositionsLatLongAlt.csv from the inputs folder and click Open.
10. On the Import Ground Control Points windows, click OK.

The GCPs and their position are imported and can be visualized in the GCP/MTP Manager window.

11. On the GCP/MTP Manager window click OK.
12. On the Processing window select 1. Initial Processing, deselect 2. Point Cloud and Mesh and 3. DSM, Orthomosaic and Index.
13. On the Processing bar, click Start to start the processing.

When step 1. Initial Processing is finished the rayCloud opens.

14. Mark the GCPs using the rayCloud following instructions 2. to 11. as described here 202560769. The images in the folder inputs/gcp_overview help to identify where to mark the GCPs.

 

C) Generate the DSM and Orthomosaic

When the GCPs are marked and the project is re-optimized.

1. On the Processing bar deselect 1. Initial Processing and select 2. Point Cloud and Mesh and 3. DSM, Orthomosaic and Index.
2. On the Processing bar, click Start to start the processing. 

 

Was this article helpful?
0 out of 0 found this helpful


Powered by Zendesk