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Yes, as long as the photos are georeferenced (all the DJI drones do it) or you have at least 3 GCP with x,y,z coordinates (lat, long, alt) the orthophoto will be georeferenced and will have a scale

Hi! If you are using GCP, and you are optimizing sparse point cloud after alignment, you don't realign the photos but you have to build the dense point cloud again

@@justynajeziorska6205 Thanks for answer. For example, if i add photos in order tjo optimize the result in some places where there are a lack of details, so i should start again or there is a solution to maintain the current result and just modify that place. Thank you so much.

@@plentyfacts8301 There is a way of aligning just a subset of photos. Just select the group you want to deal in the reference pane and right click. There is an option: Align selected cameras. Other than that you have to go through the building of the dense cloud anyway - each realignment, even of a small part, resets the dense point cloud

@@plentyfacts8301 If you realign just a selected group of photos, the rest of them remain aligned. but if you have built the dense point cloud and then try to realign, the dense point cloud is reset. The Alignment stays

@@justynajeziorska6205 Thank you so much. I got a last question, i have a very large surface to modelize, so i divided it to parts. So i have to fusion them, i tried with metashape, it doesnt give good results, i would like to manipulate manually the two parts and regroup them, is there any easy way to do it with another software? Thank you again !

Only the vector files can be exported as shp since it’s a vector supporting file extension. Any points, polygons or lines you create on the project (like contours) can be exported as shp. Orthophotos and DSM are rasters, you have multiple file extensions for storage, the most commonly used in GIS software is GeoTiff. I recommend exporting points to las or laz, all the geospatial software can handle it. The models- it depends what kind of modeling environment do you want to bring them in. I found .obj format pretty versatile

The only way of doing both the DEM and DSM is by filtering the ground points. Once you have the dense point cloud go to tools and classify ground points. That would allow you to have just ground points based on them you can build a DEM. It is very tricky with irregular or dense vegetation though. More on classifications in this article agisoft.freshdesk.com/support/solutions/articles/31000148866

Photos alignment needs to be performed before the optimization.

@@justynajeziorska6205 thanks a lot. Which altitude do you flight with the drône? I used to flight 40 meters and I think it isn't enough because some picture doesn't have gcp. May be that's the reason I've got really bad result in agisoft after the optimalization, the model is curve.. What do you think about that?

Końcowe parametry w raporcie są generowane automatycznie po przejściu całego procesu przetwarzania. Niektóre można kontrolować - np. ustawiając "tie point limit" przy procesie "align photos", a niektóre, jak na przykład errors, są kalkulowane przez program.

@@justynajeziorska6205 Dziękuje za odpowiedź. Czy ta opcja generowania automatycznego to "Survey Statistic" ? Mam w niej jedynie "camera overlap" i "camera locations" bez "Processing Parameters" ;"camera rotations" i "Grand Control Poit" (pewnie tego ostatniego dlatego że w moim pierwszym nalocie ich nie wyznaczałem :D). Może być to spowodowane tym, że działam na trialu ? Czy też możliwość wygenerowania "Processing Parameters" znajduję się w innej zakładce jak "tools"

@@krzysztofbuczek6832 trial powinien mieć taką samą funkcjonalność jak pełna wersja. Tak się reklamują. Błędy rotacji zdjęć są przedstawione graficznie jako części okręgów. A w przypadku GCP jako kształty i kolory elips

The measurements are done in the field with heigh accuracy GPS (not a hand held Garmin type, something that connects to the base). I have another video how to place the markers. There are couple ways

Check your table headers. They need to match the Agisoft lat long and alt. Otherwise you will load empty data

If you are working in the DEMO mode, building DEM and orthomosaic is not possible

Try to see if you have the marker view on. There is a little icon in the menu bar

This is just a sample from a longer flight (30 min). I think the flight to cover presented area could be conducted in less than 10 min.

Bide Sami reize selamlar...

In the reference pane, click "reference settings" icon (the last one in the row) and you can independently choose a coordinate system for your cameras (WGS84) and then the local coordinate system for your markers.

There is no way to mosaic two independent orthophotos as far as I know. There is a way of processing the imagery in chunks. As a result you have two partial datasets (chunks) and merge it together with the use of ground control points.

Yes, but after you click "optimize the alignment" option, the dense point cloud and the mesh will need to be build again

@@justynajeziorska6205 Thank you and how can I get my orthophoto in CAD format?

It is a log that is generated by the drone's autopilot. Most of the drones (all DJIs) have the location data written into the EXIF file.

Justyna Jeziorska so you write it again?or it automatically generated in txt file?

it was automatically generated

All the data is available for download here: ncsu-geoforall-lab.github.io/uav-lidar-analytics-course/assignments/geoprocessing.html

Yes, your GCP can be in the local system. But the. If you will try to align the photos to them, there needs to a transformation. As far as I know Agisoft does transformation from different geographic/projected systems but with your local one you will probably just need to stick to it and have the whole project in local coordinates

necesitas alinearlas a mano sino las hace automático o ir con el dron y tirar las fotos de nuevo. si había mucho viento no sirven, si no tienes por lo menos 45% de overlap de costado y de frente tampoco se hacen automáticas.

how can we fix this?

My first suspect is the projection. Are the GCP measurements in the same projection (coordinate system) as the images?

go into one of the photos, right click and place marker, match your marker to that point. Do it to at least 2-3 photos. It will apply it to others automatically