Sort of ironic that Brauer tries to mock me for being able to defeat his various false proclamations with only a bit of Google research. Isn't this much more of an indictment of his bogus proclamations than it is of anything I have done? Why the hell is the supposed expert on surveying making bogus proclamations that can easily be refuted when held up to the shallowest of scrutiny? Some expert.
As for his haughty claim that I owe him a source, I did my research
before I brought up the role of sketching. Had he bothered to do even the scantest research before ridiculing me, he'd have known I was correct! But instead he shoots from the hip and as usual completely misses his target.
For those actually interested in the role of sketching in early surveying, there are a number of books and manuals available on the subject for the relevant time period in question, and ALL address the importance of sketching in the surveying process. There were even text books
entirely devoted to the subject of the role of sketching in surveying.
In short, Brauer's claim that sketching was not a crucial part of the process, and that surveyors were never taught to sketch was flat out wrong. Were he capable of even the shallowest research he'd be able to figure this out himself.
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As for the rest, just more misrepresentations of my posts and my methodology on his part. He keeps talking about 30 minutes of internet research. Wrong again. But even if he were correct, this would only goes to the superficiality of his claims.
"Book learning" is a very good substitute for experience when "book learning" actually directly addresses the issues at hand and experience does not, like with the role of sketching in surveying in 1913. And facts are always a better option that "experience," and "experience" never an adequate substitute for fact.
One real problem with "experience" is that it tends to give people of false sense of what they know and what they don't know. We see this again and again in these conversations. For example, even now, Brauer claims to know what was "going through the minds" of the surveyors in 1913! Really? Give me a f-ing break!
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David and Bryan,
I get glossed over while reading the tech posts but it looks like you guys agree that it's impossible to prove which topo may be exactly right or wrong right now, is that accurate or no?
I hate to speak for Bryan, but I think we agree that the 1913 survey has elevations which are generally higher by around 10 feet (or more) than any other survey or data set to which we currently have access. I also think we agree that this difference is widespread enough across the site that it is very unlikely that the difference can be explained by the construction process. I think we also generally agree that the shape of the land depicted by the contours on the 1913 map probably reflects the general shape of the ground pre-construction.
We disagree on whether or not we can reasonably conclude that the absolute elevations on the 1913 were wrong. As far as I can figure, Bryan has some doubts about the accuracy of the various other sources of information we have (the 1953 survey, the 1/3 data set, the 1/9 NED, the 1/3 NED, the 1 Arc Sec NED) all of which contradict the 1913 map. While I share many of his specific concerns about these datasets and maps, it seems to me that at least some of the data points underlying these various data sets are very likely accurate, and so even with the problems I have no qualms about drawing conclusions about the overall accuracy of the absolute elevations on the 1913 map.
Another thing I assume we agree upon is that there is absolutely no reasonable justification for claiming to a 99.99% certainty that the 1913 map is accurate as to the absolute numbers.
. . . a dozen or so posts ago you put up an overlay of a current topo and suggested it was strange in some way, I'm curious what it is about it that strikes you? I notice the elevations look lower across the board, is that it?
I think my concerns are similar to Bryan's, I think. As he said, the contours look smoothed and they lack detail. Another concern I have is that I don't know what data they used to create the data. Bryan specuates it was the same data used for the 1913 map, but I cannot really think of many reasons why this would be the case. Whatever the data, the contouring application does not appear to be good for much other than providing a very rough approximation of the lay of the land.
You say the elevations look lower across the board . . . lower than what?