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dji TOPODRONE PHANTOM 4 PRO L1 PPK, User Manual, Page: 41 / 42

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dji TOPODRONE PHANTOM 4 PRO L1 PPK User Manual Download Page 41

 

Topodrone SA 

CHE-354.723.874 TVA 

Rue du Centre 39, 1637 Charmey, Switzerland 

+41 797 910 713 

[email protected] 

www.topodrone.org

 

 

Page 40 from 42 

 

4.4.

 

Aerial triangulation accuracy improvement. Tie points filtering 

In order to increase the accuracy of your model, we suggest filtering tie points with the Gradual 

Selection tool. Open Model menu, click Gradual Selection. 

 

Select Gradual selection and input 0.35 value 

 

 

 

Summary of Contents for TOPODRONE PHANTOM 4 PRO L1 PPK

Page 1: ...Topodrone SA CHE 354 723 874 TVA 1820 Rue de la Gare 13 Montreux Switzerland 41 797 910 713 info topodrone org www topodrone org TOPODRONE DJI PHANTOM 4 PRO L1 L2 PPK USER MANUAL ...

Page 2: ... receiver settings 6 2 GNSS data post processing and image geotagging 7 2 1 Data preparation 7 2 2 GNSS data postprocessing and image geotagging 7 3 Photogrammetry processing in Pix4D mapper 16 3 1 Creating a new project 16 3 2 Initial aerial triangulation 21 3 3 Camera calibration 22 3 4 Accuracy estimating 28 4 Photogrammetry processing in Agisoft Metashape 31 4 1 Creating a new project photo al...

Page 3: ...d to fly in No Fly Zones airports prisons sports stadiums Military bases state institutions objects of strategic importance CHP hydroelectric power plants nuclear power plants etc are particularly dangerous but they are not marked at GEO services Electricity transmission lines located at the place you need to capture can cause radio and magnetic interference during the flight 4 Setting In the DJI ...

Page 4: ... on the photo Do not change the orientation of the drone 8 Rotate your drone to the left side counter clock wise in 380 degrees a bit more than 1 turn Stop when the rear LEDs will change their color from solid yellow to solid green 9 Change the orientation of your drone turning it in 90 degrees in a longitudinal axis 10 Rotate the drone to the left side counter clock wise in 380 degrees a bit more...

Page 5: ...t the focusing method now is in the AF value Then tap the center of the screen to let the camera focus at the surface After that change the focusing method in the MF value manual focus scale will appear Do not touch it Now your drone s camera is focused at the selected height value It will not change in the future 4 Now it is time to set the best camera settings All parameters are set auto as defa...

Page 6: ...is not the same as the default To calibrate IMU you need to do next 1 Remove the props from the motors if needed 2 Remove the gimbal holder and turn on the drone and the remote controller 3 Prepare two tables standing close to each other or another flat surface with a hall the horizon should be aligned with the bubble level 4 Start the IMU calibration process and make steps 1 5 as they are 5 At th...

Page 7: ...received Blinks green Flash card write mode each interrupt means 4 KB of data is written Solid red Micro SD card error 4 GNSS cable it should be plugged do not touch it Each time the receiver is turned on a new ubx file is created in the folder with the date of the DD mm yy format and the name of the HH mm ss format It is important that the time is recorded in UTC and the file is created only afte...

Page 8: ...olders For example Flight 1 Flight 2 etc NOTICE Do not delete any images Remove the SD card from the GNSS receiver installed on the drone and copy ubx files to your computer to a folder ROVER for example Download GNSS static logs from the base station and convert them to Rinex format Copy Rinex files to a folder BASE for example Measure coordinates of ground control points GCPs and coordinates of ...

Page 9: ...Topodrone SA CHE 354 723 874 TVA Rue du Centre 39 1637 Charmey Switzerland 41 797 910 713 info topodrone org www topodrone org Page 8 from 42 Step 2 Select a folder with photos ...

Page 10: ...Topodrone SA CHE 354 723 874 TVA Rue du Centre 39 1637 Charmey Switzerland 41 797 910 713 info topodrone org www topodrone org Page 9 from 42 Step 3 Select a UBX file from a drone ...

Page 11: ...Topodrone SA CHE 354 723 874 TVA Rue du Centre 39 1637 Charmey Switzerland 41 797 910 713 info topodrone org www topodrone org Page 10 from 42 Step 4 Select a Rinex or UBX file from the base station ...

Page 12: ...rone org www topodrone org Page 11 from 42 Step 5 Impute coordinates of the base station in WGS 84 Define antenna offset for the drone NOTICE FOR DJI MAVIC 2 PRO PPK use the following parameters Height 0 07 Offset forward backward 0 02 FOR DJI PHANTOM 4 PRO PPK use the following parameters Height 0 17 ...

Page 13: ...g Advanced setting will appear To embed precise coordinates to photos EXIF tags check Burn exif check box This option may lead to increasing of the data processing time To save the list of coordinates check Save text file check box Select the format of the text file Pix4D or Metashape Click Save button NOTICE To look at data processing progress check Display utility windows option Click Start butt...

Page 14: ...data processing data conversion GNSS data post processing images matching and geotagging all results will be stored in the Output folder File Coordinates txt is stored in the PIX4D or Metashape folder Photos with updated EXIF tags are stored in the UpdateTags folder Files with pos extension are the results of the GNSS data postprocessing NOTICE The coordinate system is WGS84 ...

Page 15: ...ge 14 from 42 Step 7 Checking the processing results After the processing finishes the following buttons will appear NOTICE Click buttons in front of the Rover or Base fields to open GNSS observation files and check the quality of GNSS signal To check the quality of GNSS data postprocessing click button in front of output results ...

Page 16: ...Yellow points Float solution Red points Single solution NOTICE If there are only red points on the map it means that the GNSS data from the drone and the base station were not collected at the same time If there are only yellow points float solution you should check the coordinates of the base station or the quality of the signal To remove noisy GNSS signal try increasing the satellite mask angle ...

Page 17: ...mey Switzerland 41 797 910 713 info topodrone org www topodrone org Page 16 from 42 3 PHOTOGRAMMETRY PROCESSING IN PIX4D MAPPER SOFTWARE 3 1 Creating pix4d mapper project Run PIX4D mapper application Click New Project Select a project folder location Click next ...

Page 18: ...one SA CHE 354 723 874 TVA Rue du Centre 39 1637 Charmey Switzerland 41 797 910 713 info topodrone org www topodrone org Page 17 from 42 Select images to be processed from output UpdateTags folder Click next ...

Page 19: ...coordinates of the images and the accuracy settings automatically Click Next NOTICE It is possible to upload the coordinates from the txt file Click From File button and select the coordinates txt file It is recommended to check the camera settings Click Edit button and check if the Linear rolling shutter camera model is enabled if you have used a DJI MAVIC 2 PRO for survey ...

Page 20: ...Topodrone SA CHE 354 723 874 TVA Rue du Centre 39 1637 Charmey Switzerland 41 797 910 713 info topodrone org www topodrone org Page 19 from 42 Select an output coordinate system and click Next ...

Page 21: ...Topodrone SA CHE 354 723 874 TVA Rue du Centre 39 1637 Charmey Switzerland 41 797 910 713 info topodrone org www topodrone org Page 20 from 42 Select a type of data processing options Click Finish ...

Page 22: ...d 41 797 910 713 info topodrone org www topodrone org Page 21 from 42 3 2 Initial aerial triangulation Once the images with precise coordinates are loaded to the project we can start the initial aerial triangulation Select the initial processing checkbox and start processing ...

Page 23: ... Rue du Centre 39 1637 Charmey Switzerland 41 797 910 713 info topodrone org www topodrone org Page 22 from 42 3 3 Camera calibration In order to calibrate the focal length of the camera you need at least one GCP Click GCP MTP button ...

Page 24: ...4 TVA Rue du Centre 39 1637 Charmey Switzerland 41 797 910 713 info topodrone org www topodrone org Page 23 from 42 Select the coordinate system of ground control points and import GCPs Click OK Change the GCP type to Check point ...

Page 25: ...rland 41 797 910 713 info topodrone org www topodrone org Page 24 from 42 All GCPs will be shown on the map Select one GCP define the position of the ground control point at each image change the type of the selected GCP to 3D and set the horizontal accuracy to 50 meters ...

Page 26: ...Centre 39 1637 Charmey Switzerland 41 797 910 713 info topodrone org www topodrone org Page 25 from 42 Click Reoptimize button Click Ok on all warning messages After finishing the reoptimization process click the Image property editor button ...

Page 27: ...874 TVA Rue du Centre 39 1637 Charmey Switzerland 41 797 910 713 info topodrone org www topodrone org Page 26 from 42 Click the Edit camera model buttons in the Image Properties Editor window and in the Edit Camera Model window ...

Page 28: ... info topodrone org www topodrone org Page 27 from 42 Click Load Optimized parameters Copy the Focal Length value for the future work NOTICE It will be possible to use the calibrated value of the focal length for the processing if you do not change your focus settings for the future flights ...

Page 29: ...re 39 1637 Charmey Switzerland 41 797 910 713 info topodrone org www topodrone org Page 28 from 42 3 4 Accuracy estimating Load the ground control points Set them up as check points Select position of all check points at images to check accuracy ...

Page 30: ...874 TVA Rue du Centre 39 1637 Charmey Switzerland 41 797 910 713 info topodrone org www topodrone org Page 29 from 42 Go to the Processing options menu Select None for Internal Parameters Optimization Click Ok Click Reoptimize ...

Page 31: ...rland 41 797 910 713 info topodrone org www topodrone org Page 30 from 42 After finishing the optimization process go to Process Menu click Generate quality report Data processing report will be generated Go to Geolocation Details to estimate the accuracy of the project ...

Page 32: ...om 42 4 PHOTOGRAMMETRY PROCESSING IN AGISOFT METASHAPE SOFTWARE 4 1 Creating a project photo alignment The following process should be performed in the Agisoft Metashape software Add photos to the project Import positions from the file coordinates txt Go to Reference Click Import button select coordinates txt file from folder with photos ...

Page 33: ...tzerland 41 797 910 713 info topodrone org www topodrone org Page 32 from 42 Select WGS 84 coordinate system setup columns order 1 3 2 4 click Accuracy checkbox select field 5 click OK Accurate X Y Z coordinates and accuracy values will appear in the Reference window ...

Page 34: ...Switzerland 41 797 910 713 info topodrone org www topodrone org Page 33 from 42 Go to Tools click Camera calibration and input the calibrated parameter for focal length 10 4777 select fixed F parameter Go to Workflow and click Align Photos for aerial triangulations ...

Page 35: ... 39 1637 Charmey Switzerland 41 797 910 713 info topodrone org www topodrone org Page 34 from 42 After finishing the aerial triangulation go to the Reference click Optimize Camera Alignment and click on Fit additional corrections check box Click OK ...

Page 36: ...0 713 info topodrone org www topodrone org Page 35 from 42 4 2 Accuracy estimating After finishing the aerial triangulation go to the Reference click Import and load the GCP txt file Use the following settings and click OK Click Yes to All button GCPs will be shown at the Model window ...

Page 37: ...one SA CHE 354 723 874 TVA Rue du Centre 39 1637 Charmey Switzerland 41 797 910 713 info topodrone org www topodrone org Page 36 from 42 Select the locations of each GCP on photos and look at accuracy report ...

Page 38: ... from 42 4 3 Camera calibration To calibrate your camera focal length load the images import accurate coordinates of photos perform the photo alignment do not fix F parameter and import the GCPs Define the position of every marker on each photo Select 2 3 markers Click Optimize camera Alignment use the following settings and click OK ...

Page 39: ...637 Charmey Switzerland 41 797 910 713 info topodrone org www topodrone org Page 38 from 42 After finishing the aerial triangulation go to Tools click Camera calibration Select adjusted and Save button Select Info Camera Calibration format and save file ...

Page 40: ...txt file and copy the focal length value NOTICE It will be possible to use the calibrated value of your camera s focal length for the processing in future if you do not change your focus settings NOTICE It is possible to use the calibrated value of your camera s focal length for the processing if you do not change focus settings for future flights ...

Page 41: ...e org www topodrone org Page 40 from 42 4 4 Aerial triangulation accuracy improvement Tie points filtering In order to increase the accuracy of your model we suggest filtering tie points with the Gradual Selection tool Open Model menu click Gradual Selection Select Gradual selection and input 0 35 value ...

Page 42: ...witzerland 41 797 910 713 info topodrone org www topodrone org Page 41 from 42 Go to Edit menu and delete the selected points Click Optimize Camera Alignment Check the accuracy and repeat the steps described above until the Reprojection error reaches 0 65 0 35 value ...

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