Photogrammetry: Office Work - Part 2
This is the second part of a video where I show you how to produce a scaled and georeferenced photogrammetric model using a relatively cheap set-up without unmanned aerial vehicles nor an expensive survey instrument such as a total station or a GNSS RTK.
In this video, I focus on office work and processing times. Tricks and tips to go around problems that may arise during the process.
Intro: (00:00)
Photogrammetry software: (0:14)
--Set-up GPU: (2:34)
Adding photos: (3:52)
--Masking photos: (4:39)
--Correcting masking: (6:17)
Align photos: (7:31)
--Markers: (11:32)
--Georeference model: (15:22)
Dense point cloud: (24:11)
--Modifying ROI (Region of interest): (26:47)
Generating Mesh: (32:10)
Building the texture: (34:19)
Creating a DEM: (37:02)
Creating an orthomosaic: (39:38)
--Measuring on the model: (40:54)
--Creating profile sections: (42:45)
--Exporting and visualising DEM in QGIS (44:19)
EPILOGUE - Street footpath processing (46:20)
This method does not replace these instruments. If you are looking for a more reliable method and higher quality, this video is not for you, or it might be as long as you are aware that this technique is mostly aimed at producing a simple 3D model. This model can be used to produce a relatively accurate topographic map and perhaps for preliminary analysis.
This video will try to show you the fundamentals of photogrammetry or Structure from motion or Multi-view stereo applied to St John the Evangelist Church - http://www.brandonparish.org.uk/Welco...
I'm showing you how to use some reference points on our model that are visible in Google Earth so we can georeference it to use it on a GIS program.
Gear:
-Boompole
-Photographic camera - Fuji T-100, lens 15-45 mm
-flexible tripod and phone holder
-Fuji Camera Remote app and mobile phone
-16-bit circle targets
-Monopod holster pouch
Software:
-Agisoft Metashape (formerly known as Photoscan)
-Google Earth
-QGIS 3.16
Hardware:
-Lenovo Yoga, Core i7, 16 GB ram, Nvidia Geforce GTX 1050
#PHOTOGRAMMETRY #AGISOFT #CHURCH