So I was fortunate that someone who follows me took the time to create a DEM for me (Canada, Niagara Region, and I got to see first hand what this was all about. I believe it was 30M data (the NASA stuff whatever that is) in TransDem Visual Earth zoom level 15. Now I have to admit the Niagara gorge does look beautiful, and I was even able to due a mocked version of Niagara Falls to my surprise. Going into smaller bodies of water however like the Welland Canal I found the accuracy was off. I assume this is because it's 30M thus the points are registering at the wrong spot etc. So a bigger body of water (though having some faults of their own) is not as noticeable.
But having said that the grades as I've heard can be like a roller coaster (probably for the same reasons). I've seen advice such as do not try and flatten the terrain but work with it for now etc. and take baby steps. As much as I've seen tutorials on TransDem (though few) I haven't seen much when it comes to mastering the post process of DEM.
The pros of this was my entire area now had track though it needs fixing it's all there everything including ancient track long gone (I'd rather see more than less so I can appreciate that more. But the grades and understanding the best approach would be interesting. Also I've thought about getting TransDem to try and find something in Canada with even more detail (if it's possible) but the price of TransDem for 1 railroad is steep, and then add the cost of buying data from the government I guess?
Any advice or tutorials beyond this process is appreciated. For now I'm torn between doing it by hand and continuing my progress, or working out the kinks of the DEM and trying to live with this.
Thanks
Sean
But having said that the grades as I've heard can be like a roller coaster (probably for the same reasons). I've seen advice such as do not try and flatten the terrain but work with it for now etc. and take baby steps. As much as I've seen tutorials on TransDem (though few) I haven't seen much when it comes to mastering the post process of DEM.
The pros of this was my entire area now had track though it needs fixing it's all there everything including ancient track long gone (I'd rather see more than less so I can appreciate that more. But the grades and understanding the best approach would be interesting. Also I've thought about getting TransDem to try and find something in Canada with even more detail (if it's possible) but the price of TransDem for 1 railroad is steep, and then add the cost of buying data from the government I guess?
Any advice or tutorials beyond this process is appreciated. For now I'm torn between doing it by hand and continuing my progress, or working out the kinks of the DEM and trying to live with this.
Thanks
Sean