ReDem Expert needed

[PapaXpress]

Is what you are seeing anything like this?
http://thegradecrossing.blogspot.com/20 ... r-fix.html

[RAILSOHIO]

I sometimes get a partially created tile(a joint in the data?) or a whole tile that will not take data. Good thing that 1/9th and 1/3rd data are both high resolution. I could barely see any difference in the continuation across tiles created adjacent to each other. I have not had to drop down to 1 arc-second,yet,on my DT&I,B&O PRR mega route.

[GhostLines]

Hi

For the last few days I've been working on a very long route and I've run into basically the same situation.

The fundamental problem is that ReDem needs overlapping DEM data sets if you want to create contiguous BIN files using multiple ReDem runs.

If you request a "large" area from the Seamless Server, it will split up the output into non-overlapping chunks and you get multiple files for your download, (which leads ReDem to produce partial or missing tiles).

My workaround for this was to re-download all my DEM data - but with two changes:
1. Each request was limited to a set of long & lat boundaries that would NOT be split into multiple files for download.
2. Also, each set of boundaries was chosen to ensure that adjoining blocks of DEM data would have overlapping areas of coverage.

I was using 1/3 arc sec data, and found that I could reliably quest about 1 square degree of data per download. Also, I found it useful to go back into Google Earth and display all my KML paths and turn on the longitude and latitude coordinate grid, so I could quickly pick the boundaries for my requests the the Seamless server.

BTW, there is an very helpful option (on the "Modify Request box") to bump up the max file size limit to 250KB, rather than use the 100KB default limit.

After getting the new DEM data, running ReDem was cake, and I got a complete "seamless" BIN data set for my route.

Cheers,

[RAILSOHIO]

It seams (pun intended) that it might be time for a new tutorial on using the seamless server and ReDem. Existing tutorials cover the basics,and you have to wing the rest.(partial tiles,no data tiles,etc,etc) The ReDem forum is not really active. I have downloaded bil files that were nowhere near the size limit,and they were broken into 2 files within the extracted folder. And when that happens, a fractured tile likely will be created after processing. But I am happy with the help I have received on this forum. I think it is very cool RW3 made it easier to import real terrain. But if higher resolution data is available for the area you are modeling, ReDem is a MUST,in my opinion.

[SD70MAC]

I have a question, when dowloading DEM data which one should i chooses to use and download: BIL (Meters), BIL (Feet) or GeoTIFF (Meters), GeoTIFF (Feet)?

[Bananarama]

BIL GeoTiff meters.

[imnew]

Hey guys Maybe im a little late to the party, but... Why do people even go the Redem way? I have yet to discover any " holes" in the terrain im using from the seamless server. When i did the NS Altoona to Johnstown route a year ago, the terrain was spot on, granted it was the best terrain data available from USGS, but never did i discover any holes or missing terrain. As im now building the Conrail Chicago Lines, (used the same method as i did for the Altoona route) i have still to discover any missing data, or holes in my terrain.

( If any prospecting route builders read this, right now there seems to be two ways of getting terrain into your route, the Redem way and the way i describe in my tutorial uploaded in the file library last year )

My question is this, as so many people go with Redem, what are the guys using "my way" missing out on? 640 people have downloaded my tutorial to date. Do you, who use Redem have more "correct" terrain than we do? Just curious on what way results in the best terrain.

If Redem is THE way to go, maybe someone should make a tutorial and make that the standard for future route builders. Just want to make sure future route builders get the best method and terrain available.

[NDORFN]

The reason I got ReDem is because I couldn't find any 1/9th arc DEM in the right format for Railworks. And let's face it, if it aint 1/9th, it's not worth it.

[imnew]

The reason I got ReDem is because I couldn't find any 1/9th arc DEM in the right format for Railworks. And let's face it, if it aint 1/9th, it's not worth it.

Gotcha and thanks for responding. Wish the whole US had 1/9th data, im using 1/3 and if it hadnt been for Google Earth height data and RWDecal, it would have been a no go creating the route im working on right now.

[RAILSOHIO]

Imnew,your tutorial helped me get my first terrain into RW. But I saw lots of missing detail in the extracted terrain,that I had visited in real-life.Once I learned ReDem, I couldn't consider replicating prototypical routes without it. As many of us have found out,there are "holes" in the 1/9 data. But I have no problem filling in that one percent with lower rez data. ReDem was not to hard to learn,and the community helped alot. Waiting in line at the Seamless Server sometimes is the hardest part!

[imnew]

Thank you for responding Railsohio. I hope someone will consider making a Redem tutorial so that future route builders will benefit with the best terrain method in any given area.

[railbard]

Thank you for responding Railsohio. I hope someone will consider making a Redem tutorial so that future route builders will benefit with the best terrain method in any given area.

Yes, please! I'll beg if I have to!

Kevin

[DonR]

Hi Guys,

There is a thread on it here: viewtopic.php?f=7&t=1784

The ReDem documentation isn't too bad either.

You also might want to look up RWDecal tutorials for building routes.

Thanks,
Don