Gradients off on hog route?

[rwk]

I have this route through Port Jervis, NY that was probably made by fishlipsatwork and where the tracks should go look like a roller coaster at spots. I read that HOG data is less accurate than TransDEM and 1/9 arc second DEM data. So, I just have to fudge it and make the track through Port Jervis level grade but then there are high fills at spots including where the old Erie station should be. There was a site where you could get the elevation data for any spot on a satellite map, but I forget the site.

 

[mapsgame]

I think you may be talking about Google Earth Pro. I believe it has both Web and Installed versions. Its a free download for Windows or Mac OS. Once downloaded and installed you can search for Port Jervis and it will automatically take you there or anywhere on Earth. The Elevation of the ground at the pointer location is given in the lower right bottom of the screen. On the lower left part of screen under Layers you can toggle (check box) on terrain and see a 3D type view when you tilt the view. To return to a perfectly vertical view you can press the R key.

 

[ricomon35]

I think you may be talking about Google Earth Pro. I believe it has both Web and Installed versions. Its a free download for Windows or Mac OS. Once downloaded and installed you can search for Port Jervis and it will automatically take you there or anywhere on Earth. The Elevation of the ground at the pointer location is given in the lower right bottom of the screen. On the lower left part of screen under Layers you can toggle (check box) on terrain and see a 3D type view when you tilt the view. To return to a perfectly vertical view you can press the R key.

HOG maps have nothing to do with G-Earth.
They are maps generated with an old multi-step methodology from the early days of Trainz.

See here > How to use HOG?


Rico

 

[mapsgame]

HOG maps have nothing to do with G-Earth.
They are maps generated with an old multi-step methodology from the early days of Trainz.

See here > How to use HOG?


Rico

I know HOG maps have nothing to do with Google Earth. @rkw asked "There was a site where you could get the elevation data for any spot on a satellite map, but I forget the site." I think the is talking about Google Earth. He is looking for spot elevations to use to smooth the HOG undulating rail line grades. He can accomplish that with Google Earth's spot elevations and knowing the distance between elevation points.

 

[ricomon35]

I know HOG maps have nothing to do with Google Earth. @rkw asked "There was a site where you could get the elevation data for any spot on a satellite map, but I forget the site." I think the is talking about Google Earth. He is looking for spot elevations to use to smooth the HOG undulating rail line grades. He can accomplish that with Google Earth's spot elevations and knowing the distance between elevation points.

Ah, gotcha, @mapsgame. That site would the USGS Dem data site here >>> https://www.usgs.gov/the-national-map-data-delivery

Rico

 

[JCitron]

HOG generated terrain uses inaccurate TIGER overlays that are superimposed on top of low-resolution DEM data. TIGER map placement can be off anywhere between a few meters to hundreds of meters.

Your best bet is to check actual topographic maps such as those found on the National Map server and also on Google Earth using either the regular web or the more complex, and more useful Google Earth Pro with the historical views as well as height measurement capabilities.