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"Meters of Feet?"

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BN_9402 (15 posts)
Sep-27-01, 10:40 PM (EST) "Meters of Feet?" Hello. I was just merging some DEM for my route when MicroDEM said that the merged DEM was in both meters and feet. So what do I go with? Thanks!Austin Alert Edit | Reply | Reply With Quote | Top
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Subject Author Message Date ID RE: Meters of Feet? mrawek Sep-27-01 1 RE: Meters of Feet? DKlemm Sep-28-01 2 RE: Meters of Feet? wewain Sep-28-01 3 RE: Meters of Feet? akochan Sep-29-01 4 RE: Meters of Feet? wewain Sep-29-01 5

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mrawek (79 posts)
Sep-27-01, 11:50 PM (EST) 1. "RE: Meters of Feet?" Hi,I wonder how Microdem can find that out. If you have proper xyz data, there are just numbers without any units. Microdem ask then either if you have meters or feet, which you must answer. You can find out by having a look at the xyz file. Search for a place on a map of your area with an altitude reference (mostly on peaks) Note the coordinates and search for a nearby coordinate in your xyz data file. The third row is the altitude. Compare it with the altitude from the map and you'll know if you have feet or meters.Daniel Remove | Alert Edit | Reply | Reply With Quote | Top
DKlemm (452 posts)
Sep-28-01, 09:00 AM (EST) 2. "RE: Meters of Feet?" Austin;
If your DEM is mixed, then you must only merge like DEM's together. OF course maybe someone more expierenced in Microdem knows how to mix them, I don't. I had some in centimeters and meters and when I merged them I got a huge wall where the centimeter one was.Daniel;
The txt file for each DEM tells you what unit of measure the DEM is in as well as other things, like when it was collected and so on.David Klemm
Illinois Central
56 miles done, 0 to go!
Dunkel to Clinton IL
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wewain (88 posts)
Sep-28-01, 08:07 PM (EST) 3. "RE: Meters of Feet?" As I recall, there is a way to pre-process the DEM files one at a time to convert the elevation units to whatever you want. You have to know what the origianl units are, but the .txt file for each DEM tells you that.Does anyone remember how to do this?What units would be the best choice, (does MSTS want the end-result to be meters)? Remove | Alert Edit | Reply | Reply With Quote | Top
akochan (10 posts)
Sep-29-01, 09:39 AM (EST) 4. "RE: Meters of Feet?" Well, MSTS wants them to be in meters.
10 and 30 meter DEMs work bestIn fact, I don't believe I've ever even seen a DEM in feet.
Who would want one in feet? Feet are silly. I'm so glad the US
is finally beginning to be, slowly and kicking and screaming the whole way, being dragged into metricism.On a side note, although the USGS maps use feet for contour lines, their DEMs are all 10 or 30 meter DEMs.-Andy
akochan@crosswinds.net Remove | Alert Edit | Reply | Reply With Quote | Top
wewain (88 posts)
Sep-29-01, 11:33 AM (EST) 5. "RE: Meters of Feet?" The 10 or 30 meters refers to the horizontal spacing between the measured data points.
In my area, these were always in meters, but some were 10 and others were 30.
I believe you have to pick one, and convert the others to match it so that the DEM-MSTS
program to properly convert it for use by MSTS.
If I'm mistaken, perhaps someone will post a reply).When deciding what spacing you want, probably choose the one that most of your DEMs use.
If you convert a 30 meter DEM to something less, you will have more data points and a larger file.
You won't have more elevation accuracy, because the conversion will use an average of the
elevation of adjacent known points. That's essentially what MSTS will do anyway,when it
displays your terrain.The actual elevation data was sometimes in feet and sometimes in meters, (the .txt file
tells you which). If MSTS is using an integer number of meters for elevation, we might
just as well convert the elevation units of any DEMs that are not already that way, to meters.
Does anyone know if MSTS uses integer meters for storing elevation data? Remove | Alert Edit | Reply | Reply With Quote | Top

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