High Resolution Orthophoto

[JeremyH]

I’m trying to create an orthophoto in WebODM from a collection of drone images flown at an elevation of 35ft. In one run I’ve collected about 168 12MP images but the output resolution is 1104x693 pixels. My settings are: resize images: no as well as fast-orthophoto: true, ignore-gsd: true.

If my only goal is to get a high resolution image, say something where any text found on signs on the ground in the source imagery is just as readable in the final image, what settings would I need to tweak?

I only care about an orthophoto and no other products.

[israelbar]

Hi JeremyH,

What kind of drone are you using? what’s the project GSD?

you can change ignore-gsd to ortophoto-resolution 0.5 or the lowest possible gsd

[Gordon]

@JeremyH

say something where any text found on signs on the ground in the source imagery is just as readable in the final image,

Are the signs facing upwards? An orthorectified photo is like a map- you generally cant see the vertical faces of things like signs, only the view from above, apart from sometimes near the edges of the orthpohoto.

[JeremyH]

@israelbar Thank you very much, changing the orthophoto-resolution to a very small number made a very nice image. Is there a way to determine an appropriate resolution based on my source imagery? Such as 0.1 or 0.01 just so I don’t remove any quality from the photos?

@Gordon There was a knocked over sign in the linked source imagery that was facing upwards.

[israelbar]

Calculate the GSD based on the camera model, so you can determine the lowest --ortophoto-resolution

If you need more detail, then you can upscale the images. I have used topaz gigapixel with outstanding results.