Importing Pix4D data into IMS Map360
Posted by James Johnston on 02 July 2021 01:50 PM
Best Practises for working with Pix4D, Evidence Recorder and IMS Map360 to incorporate Photogrammetry derived data into a Forensic Diagram.
Important Note: Pix4D, IMS Map360 and Evidence Recorder can collect data which can be merged into a single Map360 project. The user must select appropriate settings with regards to Units (Feet, US Feet, or Meters) and the Mapping Coordinate system. This guide will step you through the process.
1. Perform fieldwork to collect imagery and, if required, ground control points on visible ground targets. A UAV and Terrestrial Cameras can be used to create imagery. Evidence Recorder and an RTK GPS system can be used to collect Ground control points that match painted targets that were included in the photographs. Evidence Recorder can also be used to measure points and linework for other details that you need to include in your map but are concerned will not be visible from the photographs.
2. Create a new Pix4D project:
3. Add Images to your project:
Note the Image Coordinate System shown above, this is the system by which geotags are interpreted. These may be WGS84, UTM or ITRF. It is dependent on your drone or camera settings. This coordinate system may differ from your Ground Control File coordinate and unit Settings or your Output coordinate and unit Settings without adversely affecting your results.
6. The output coordinate system, plus the units setting, must match those set (or about to be set) in IMS Map360. Select Feet or Meters FIRST, then you will be presented with a list of available systems in the “Known Coordinate System” field. In this example we are selecting the Missouri West system in feet:
7. Pick Finish
9. Use the dialog below to ensure that you have assigned the same Coordinate system and units for both GCP and Output Coordinate System:
10. See below for some recommended configurations for Processing options:
11. Now we can start Processing.
12. Turn off options 2 and 3 for the first stage and then "Start"
14. This will take a while. When complete, examine the Processing Report. If the results look good, check on Options 2 and 3 and pick “Start” to complete the creation of a pointcloud and orthomosaic.
15. The Result:
16. Importing the pointcloud, or LAS file into your Map360 project:
17. Open or create the drawing which you intend to import the Pointcloud data into.
18. Select the units you would like your final project to be in, and designate a location for your drawing:
NOTE: We recomend using the option to create a scene folder when creating your Map360 drawing, and copying all files that were generated by Pix4D into the same folder. This will make it simple to locate files in the future or move data froim one computer to another.
Open your project settings and set a coordinate system. Use the same system that was designated as the "Output Coordinate System" in Pix4D. Because of variations in naming conventions used in different software you may need to consult MicroSurvey support for guidance on this topic. Pix4D will allow to to review the EPSG reference number of the Output system and MicroSurvey support can reference this number to help you find an equivilent.
21. This will make a connection to the EpcA engine and connect IMS Map360 to Cyclone.
23. Run Leica Geosystems Cyclone. (A free "Viewer" installation is fine, license not required.)
24. Expand “SERVERS” in the tree
25. Right-click on the “YOURCOMPUTERNAME (unshared)” database and select "Databases":
26. Click the “Add” button
27. …and browse to where you would like to create the new Cyclone database. We would suggest either your Map360 project folder or the location Pix4D has used to create the las file:
(typical Pix4D project location)\raw_files\2_densification\point_cloud)
29. Enter a name for your Cyclone Database (IMP) file and Pick "Open" twice:
30. Select "OK"
31. The new database is added to the list, make sure it’s checked and click Close.
33. Browse to your .las file and open it.
It may take some time to import, depending on how big the scan is.
35. Close Cyclone
36. Return to your drawing in IMS Map360. Use the “Open Cyclone” command on the Import/Export tab (Sketch mode) or on the PointCloud tab (Advanced mode) or type CWIMPORT at the commandline.
37. ALWAYS set the units to Meters when working with Pix4d, and pick on "..." to start the import.
38. Expand the Database tree as shown to find your database the model space to open, and select "Open."
39. ENSURE THAT UNITS ARE SET TO Meters.
40. Select Open
41. Your Pointcloud is imported.
If all procedures have been followed correctly any data collected using GPS and the pointcloud will align with each other.
Map360 can also import the high quality Phot mosaic image that Pix4D generates.
42. Import the Orthomosaic file found in the dsm_ortho folder:
Look in: (Pix4D project location)\raw_files\3_dsm_ortho)