David,
Re your last post about the lack of hills beyond the 3rd tee/2nd green area, could you point that out to Patrick too. He seems stuck on the physically impossible that the photo caption is literally correct and the photo was taken from between the elbow and the tee end of the fairway. Perhaps he will believe you that it can't be there; apparently he doesn't believe anyone else, or reality.
I am not telling anyone what to believe, Bryan. Patrick knows the site first hand. I don't. As far as where specifically he thinks the photo was taken from, I haven't paid much attention, but I do know that Patrick seems to understand that we can't just throw out the captions. If we do, we might as well start from scratch.
My issue has been rather simple from the beginning and it is directed to everyone who thinks that photo was taken from the ridge, including Patrick. Whether Patrick, you, Jim, or whoever says it, I don't see how it would have been physically possible to see a tree covered hillside over the 3rd tee from the ridge which would become the sixth hole. As I understand it, you agree with me that the geometry doesn't work, which is why you have instead shifted your angle well to the right of the what is depicted in the caption. I am hoping someone will explain to me how this was physically possible, but so far no one has even come close.
To be clear, I am not claiming that the 3rd tee was dead center in the photo; only that the caption says it was in the photo, and I don't see how it could have been, and I think you agree with me. Whether far left or middle left or middle is irrelevant to me, as the hills in the background are visible across the width of the photo.
I see you've reverted to the quad topos and Google Earth. The 1/9 arc second NED data a little hard to use, or do you still have some questions about it.
I have the same issue I have with the 1/9 NED as I did before. As I said, I produced that previous topo because you were asking me for my data source etc, and I expressed reservations even then.
Also, my post above addresses another mistaken claim made by Brauer
where he specifically referenced quad topos. Specifically, he claim that
". . . the hills you see in the distance are also clearly marked on those USGS quad maps in the background and would be visible but of course, David stops his cross sections before those hills in an effort to make his point, for whatever reason." In other words, he claims the topos refute my position, and that I am fudging my presentation to mask the fact that there are hills depicted on the topo just beyond where I end my cross-section. I wanted to provide him every opportunity prove his point, but he cannot and of course he will just leave his false claim out there instead of admitting he was wrong again.
But you know he was wrong Bryan.
So tell him. Tell him that there are no hills just beyond my x-section that refute my argument. And if you won't, why not?
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As for your latest experiments with the 1/9 NED, all very interesting, but the more you get into this stuff, the more it becomes clear that this state of the art information is multitudes better than the blind trust you guys want to put in the absolute elevations on the 1913 map. We can work to a full understanding of the data we are using today, including its limitations, whereas we have such ability with the old date. We do not even have any idea of the benchmark! If the benchmark data was wrong, then the absolute elevations on the entire map were wrong. And every indication is that the benchmark data was wrong. And let's not forget that the 1913 topo has this entire area one 10 feet higher. Do you think they lowered it?
It is interesting though, but I don't understand what you are trying to prove. I've already said that I didn't entirely trust the data where it appeared to be missing or where the resolution was blurry or out of focus, and I speculated that in these areas the data collection was incomplete, leading to excessive smoothing. Your experiment seems to support his position, since you chose to conduct your experiment in an area of the course and an rectangle where some of the data appears to be missing and the rest appears to be blurry.
But why would you choose such an area? Why not conduct your experiment on the range, for example, where all the features seem to be of high resolution. (If you do, I'd suggest a finer scale, as 5 ft. will not be small enough to show the level of detail.) Or at points on the course where the image is high resolution? Yes the data appears to be spotty, but there seem to be enough points with resolution to check the absolute elevations at the corresponding points on the 1913 map.
And NO, Bryan, the 1/9 NED data is not the only data source I want to use as a benchmark against the 1913 topo. I'm fine with using the most recent quad topo, Google Earth, the 1/3 NED, the data gathered in the 1980's or the data gather for any of the other USGS topos preceding the most recent. All indicate that the absolute values on the 1913 map run substantially higher across the board.
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I think we both know that the 1913 topo very likely has a benchmark problem. If state of the art technology capable of accuracy to within a meter doesn't convince you, then wait a while and they will probably improve on this as well, either by cleaner, more complete data collection or by even more accurate sensors. Then you will not be able to focus on low resolution sections with apparent missing data, and ignore high resolution sections with apparent better data.