The missing 100 ft.

[fprose]

I noticed that my M2P encodes the GPS information within the raw (DNG) file. This information is viewable with Adobe Bridge or Lightroom. I have been doing some photos hovering at 300 ft AGL, according to to my controller, which is the LAANC limit where I live. The DNG file indicated my altitude at 514 meters (1686.35 feet) which I assume is MSL. The airport close to me (DVT) is 450 meters (1478 feet) MSL. So using those numbers I see about 208 feet AGL or about 100 feet difference from what I would have expected. Your thoughts?

 

[Meta4]

I noticed that my M2P encodes the GPS information within the raw (DNG) file. This information is viewable with Adobe Bridge or Lightroom. I have been doing some photos hovering at 300 ft AGL, according to to my controller, which is the LAANC limit where I live. The DNG file indicated my altitude at 514 meters (1686.35 feet) which I assume is MSL. The airport close to me (DVT) is 450 meters (1478 feet) MSL. So using those numbers I see about 208 feet AGL or about 100 feet difference from what I would have expected. Your thoughts?

The altitude numbers in the image metadata are not to be relied on for accuracy.
Here's one reason: Elevation for Beginners: What to Know About GPS Receiver Elevation

 

[BigAl07]

I noticed that my M2P encodes the GPS information within the raw (DNG) file. This information is viewable with Adobe Bridge or Lightroom. I have been doing some photos hovering at 300 ft AGL, according to to my controller, which is the LAANC limit where I live. The DNG file indicated my altitude at 514 meters (1686.35 feet) which I assume is MSL. The airport close to me (DVT) is 450 meters (1478 feet) MSL. So using those numbers I see about 208 feet AGL or about 100 feet difference from what I would have expected. Your thoughts?

As stated don't rely heavily on those #'s.

This may be a silly question but you are getting LAANC Authorization for each flying session inside that 300' grid even flying less than 300'... yes?

 

[fprose]

As stated don't rely heavily on those #'s.

This may be a silly question but you are getting LAANC Authorization for each flying session inside that 300' grid even flying less than 300'... yes?

Yes. It's a simple step.

 

[fprose]

For the record I figured out the issue with the help of another pilot. I assumed that my proximity to the airport gave me a decent estimate of my altitude. It was suggested that I consult Google Earth and determine what the altitude actually was. Doing so, my estimates were off by about 100 ft. Mystery solved.

 

[BigAl07]

Yes. It's a simple step.

Yes it is but one that is "mistakenly" omitted because lots of people think the Grid Height is the altitude you can fly without getting permission. I see it literally every single day.