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estimating building heights...
- Thread starter F747fly
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I recommend watching this tutorial based on Tic's method
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this could be of help too http://www.fsdeveloper.com/forum/posts/684585/
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You can also use Google Earth's 3D building feature to do this by comparing the altitude of the mouse on the ground at the base of the building to the altitude of it at the roof. It isn't perfect (a lot of their 3D scans have a low resolution), and the altitude is only shown in integer meters, so there's some guess-work involved, and the 3D buildings feature isn't available everywhere, but it's easy, it's quick, and it's reasonably accurate. Plus you can do this even if you don't have any reference photos of the building itself.
jtanabodee
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Thanks for the video, Brian.
Actually, I make a reference plane for the whole airport area and I use that through out the making process. So, I don't to measure it every time you build individual building. http://www.fsdeveloper.com/wiki/index.php?title=Align_background_image_in_3D_editor
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Google Earth Pro is free these days and has a 3D Path measuring tool (click on the Ruler button, then 3D Path tab). You can use it to measure building height anywhere Google Earth has 3D buildings, as explained here:
https://productforums.google.com/forum/#!msg/maps/-uaznvWIkl4/-bTdMx3M3skJ
https://productforums.google.com/forum/#!msg/maps/-uaznvWIkl4/-bTdMx3M3skJ
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If I have reasonable photos I sometimes use the 'match photo' function in Sketchup. Or I do it manually by opening a photo in Ps, correct any perspective distortion then pick a reference object in the photo (such as a door) and count the number of pixels that make up the door height. Given the height of the door is say 80 inches I can work out the number of pixels per inch in the photo and use that to calculate any other dimension in the image. Obviously the margin for error increases with the amount of perspective distortion that you have to correct in the original photo. Although neither method is super-accurate it is generally better than a close approximation. 