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Reading Topic #11435
I have just downloaded all dems for a route i have decided to build.When i try to merge them , after only 9 dems are merged i get an "Out of Memory" error.Is this because i am trying to merge too many dems.About 70 dems , all 10 meter dems.ThanksBruce.
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Yep, nine is about the limit. I'm guessing you've got
256 megs of ram?Lloyd
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LAST EDITED ON Feb-11-04 AT 11:49 AM (EST)
I've found there is some variation about how far you can get. Naturally you want to close all other apps and you may want to look at closing the background stuff too, like Norton, which takes up a lot of memory. The order in which you merge can have an effect too, tho I don't fully understand it... it seems it's better to merge one column of vertical sections early and then keep everything contiguous on single rows after that. Essentially you want to avoid getting the message "allocating..." which pops up when you jump around your files, loading them to all sorts of areas in your map. I also had fewer problems under XP than Win98. Lastly, it also appeared to me that the seamless DEM data did better on this problem than the seamed, but that may have been my imagination.Hope this helps a bit.Dave NelsonWP mainline, Oakland-Stockton: 100% complete;
SP mainline, Oakland-Stockton: 20% complete;
Aug 1950 
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That sounds like an awful lot of DEMS. I had problems after about 10 when I was using Win/ME with 512M Ram. Then I switched to seamless data which is all I intend to use now and it is much better - and easier to use. I also switched to Xp HomeEdition which helped considerably.J. H. Sullivan
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What program are you using to merge the DEM files? Is it Microdem? I used Microdem to open and merge DEM files, and DEMEX to actually build the terrain for routes. I haven't worked on a route in a long time, but I remember reading that Microdem does have a limit on the number of DEM files it can merge in one session. You could just spread it out in several sessions. Merge the DEM files and then save the compiled DEM as a new file. You can then add more DEM files to it later, by opening your DEM file and then merging in 9 more at a time, or whatever the Microdem limit is. There shouldn't be a limit on the TOTAL number of DEM files you can merge together, just the number of DEMs you can merge in one session. Just keep track of which DEM files you have merged as you go.Chris T.
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Thanks for the help all.
I have been to the demex site and read in the forum and it is 9-10 dems and "crash" will result with 10 meter dems .
With 30 meter dems no worrys.
A fellow with a gig of ram could do only the same.
You are all right with your answers.
Thank you allBruce (Derailment)
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