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HomeAircraftHelicopterAerial Photography and Video › Scale Pictures
01-17-2009 03:41 AM  9 years agoPost 1
Jaymac26

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Okotoks, Alberta - Canada

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Hello
DO any of you guys do scale photos? I was asked if I could do some in the spring but I was not sure if I could. Is there a lot to these type of photos

Jason McKay

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01-17-2009 05:59 AM  9 years agoPost 2
BigguyOz

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Forster, New South Wales, Australia

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What do you mean by scale photos?

Tony Stott

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01-18-2009 05:55 AM  9 years agoPost 3
iskoos

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Orlando, FL

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I guess he is talking about looking straight(90 degress) down and taking shots from certain altitudes Tony.
That way you can have scaled images. Unlike what AP guys typically do...

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01-19-2009 12:26 AM  9 years agoPost 4
Jaymac26

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Okotoks, Alberta - Canada

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Yeah I talked to a company that developes land and sub divisions and they wanted some pictures from the air so they can see what each lot was going to look like. The scale part was for surveying measurements to get a drawning from the engineers.

Jason McKay

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01-19-2009 02:24 AM  9 years agoPost 5
iskoos

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Orlando, FL

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You know every picture you take will have sort of a scale as long as you look straight down. But it will be an odd scale. You can find the scale factor by comparing a distance between two points to the actual distance.
It is very easy if you know CAD

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01-19-2009 04:38 AM  9 years agoPost 6
BigguyOz

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Forster, New South Wales, Australia

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Sorry if this is a silly question, but what could you gain over just using Google Earth images for verticals? I would have thought that the lower the altitude, the harder to obtain undistorted images at the periphery....

Tony Stott

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01-19-2009 11:37 PM  9 years agoPost 7
Jaymac26

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Okotoks, Alberta - Canada

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I could use google earth. They just wanted some good quality 10 meg pic for some marketing material. I just thought I would ask and see if anyone here has does this before. Thanks for the input.

Jason McKay

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01-20-2009 02:15 AM  9 years agoPost 8
ehx

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Northern Minnesota

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Like anything the amount of effort required depends on exactly what you need to supply.

It sounds like the client wants to make measurements from and/or overlay ground surveyed data on the vertical photo(s). That requires more work. It could be a lot more work depending on the accuracy needed. If you are just supplying the raw vertical photos and the client will worry about removing distortions to make accurate measurements then your job is straightforward. You would want to talk to the person who would be using the photos and decide roughly what should be in each photo and make sure the spatial resolution (pixel size) is good enough. Practice some vertical shots to get an idea about shadows and light during different times of day. Sometimes the most aesthetically pleasing shot isn't the best for making measurements. For example, long shadows might look nice in a brochure, but obscure something you are interested in measuring.

If you need to supply the photo(s) in a format already corrected for distortion (i.e. the client's ground surveyed data lines up nicely on the photos in a CAD or GIS system) then this is a much bigger job. At the low end it's something like iskoos' mentioned where you need accurate, real-world coordinates for several points on each photo and then software to "warp" the photo based on these control points. On the high end you are creating full-blown orthophotos (do a Google search for details). Either way it's not a skill you pick up in a couple of weeks.

If you will be taking some brochure and/or general planning shots ask to talk to the engineering or CAD guys about supplying the raw verticals. You might be able to make a little more money.

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01-20-2009 11:19 PM  9 years agoPost 9
Jaymac26

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Okotoks, Alberta - Canada

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Thanks Ehx
That answers the questions i was asking perfectly. I thought there might be a lot involved. I will talk to them and see what the y are after.

Jason McKay

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