Great instructional video at a the perfect pace to keep up! Worked through my own project alongside yours. So clear and concise. Easy to follow! Thank you!
Very informative. I think you missed to define the 6and7 check points GCP Manager . Initially you said that points Will not involve in georeferencing. Thanks alot.
Points 5,6 & 7 are used to validate the geolocation accuracy so they were assigned as check points (see 22:23). Please note that even though points 5,6 and 7 do not contribute to georeferencing the map, it is required to mark them in images to observe the errors and compute the accuracy. Those points were correctly marked in the images (see 41:10). I do not find any mistake here :)
Thabk you Mr Sasanka, this is a great video i have really learnt a lot from it. can you do more video on exporting of data to other softwares. map creation etc
Hello could you make a video on how to calibrate images (in red) without control points?; I would like to calibrate some images and relaunch the processing in order to get better 3D reconstruction of a photogrammetry
This tutorial is awesome!!! Thank you so much for uploading :) Do you remember which settings you used in pix4d capture to create the grid? Like how much overlay and so on? I´m just asking because I am new to this and would love to start a similar project as well. Thanks in advance!!
I did a mapping with my drone. the assembly of orthomosaic is perfect. However, once in KML in google earth all my mapping is shifted by 3.5 meters from the RTK point. How to remedy the situation?
Google earth is an amaizing tool but keep in mind that it has significant amount of positional error (read: www.mdpi.com/1424-8220/8/12/7973/pdf) which can be varied from place to place. So its not a good idea to verify the accuracy of your products using google earth. Most probably your products are accurate in terms of geo coordinates. There are few things you can do if you want to use google earth to be a base map for your products: 1) First verify the product overlay in Pix4D, use google base map 2) if there is a shift, use QGIS to do a translation to your orthomap and export to KML afterwards, using QGIS -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- another possibility is that an offset is introduced to your base station coordinates which has affected your GCP survey and hence photogrammetric products as well. Since the offset is constant for all GCPs and check points you wont see an error in the quality report.
Hi, when i do the mapping there are area where the images are not stitched properly with imperfections. Have you noticed this with your ortho images and what might be the cause? And i skip the second process which is point cloud and mesh as i only want the ortho image. Great video btw
Hi Sasanka awesome video. I see the Accuracy Horz and Accuracy Vert columns default to a certain value when you dropped in your CSV. Would you ever change those values?
You took it as smooth as a breeze. Kudos. If you can come up with another video on different settings to use in different terrains, managing homogenity or heterogenity in the landcape, it would be great. Thanks.
Well, there can be several possibilities 1) Randomly select several GCPs and check in the dataset how many images containing that GCP is available 2) If your dataset is correct, double-check the GCP coordinates and especially the coordinate system Let know after doing this
Nice Job! I had a hard time understanding you until I turned on "closed caption" and trying to keep up with all those mouse clicks. I can see how this is probably the most important critical step into map making. Even when you used automatic marking; the control point(s) still needed re-centering. I must admit an error less than 3cm is as perfect as this can get. Your video was great because you pointed out the most important attributes to be familiar with. I subscribed because you help provide me with enough confidence that Pix4D will be the next software that I will buy. One question though, that route you chose to fly, what was the software used in your mission? Was that Pix4D part of the mapping software? Thanks a Billion!
Thank you for the critical feedback on the video. I really appreciate it. About the flight planning software there several free apps that you can use, which are capable of acquiring data to create a 3D map. Im using DJI GS Pro (www.dji.com/at/ground-station-pro) which is the most reliable for DJI drones. Other alternatives are Pix4D capture (www.pix4d.com/product/pix4dcapture) and DroneDeploy (www.dronedeploy.com/). If you are using a DJI drone, I strongly suggest running your flight planning software in an iPad because DJI SDK for iPad is more reliable compared to Android. Hope this would be helpful and happy flying :D
It's possible to output as JPEG but not as PDF. ref: support.pix4d.com/hc/en-us/articles/360000897346-Inputs-and-outputs I suggest using QGIS to reformat and get your outputs in PDF/JPEG format
I have a question. My Drone imagery is WGS84/UTM29 and GCPs in ITM. Should I convert drone imagery to ITM or gcp to wgs84? Want final output in ITM. I have already done initial processing and converted gcp to wgs84. But maybe I should start again? Thank you video is very helpful
It's not necessary to convert manually. Pix4D will do that for you. When importing the images select the coordinate system as WGS84 (in most cases its automatically detected from image metadata). But when you are importing the GCPs in GCP/MTP Manager, make sure you select ITM as the coordinate system. You have to do this before importing the coordinates. Cheers. Happy processing
Absolutely, well done! By any chance do you have a video for "Merging"? I am having a difficult time trying to merge GROUND/Terrestrial images with aerial images. I have been using Pix4D "Catch" to get my terrestrial imagery and it just doesn't seem to want to process properly.
DJI P4P V2.0 is a good choice. keep in mind that you will need an RTK GNSS unit to establish ground control. Also check the RTK version of the phantom 4 and go for it if your budget allows. www.dji.com/at/phantom-4-rtk?site=brandsite&from=nav
Hello!! Your video is incredible. I am trying to fetch the sample data which you have mentioned in the link discription, but i am uable to fetch it. Can you please help me with providing the link to this sample data?
Yes, some distortion is there at the building edges. The way to minimize this distortion is by adding more images with more overlap, preferably as a double grid.
Not yet, but I have a guess. The drone normally uses the barometer readings to determine the altitude because it's more reliable and sensitive than the integrated GNSS. It might be due to this but this is just a guess