DEM Elevation data

[Jerl Simpson]

Thank you sir,

I think this will help me out.  I guess there is a way to convert
these to geotiff?

Thanks again,

jerl

On 6/14/05, William E Reid <wer at cstone.net> wrote:
> Just My 2 cents on the Subject.
> 
> DEMs are no longer readily available from places like usgs.  I am not
> really sure why.  They are the easiest to work with (ie convert).
> 
> If you are in the States....
> 
> at http://seamless.usgs.org you can download 3arc and 1arc second
> terrain data.  It comes in ArcGrid Format.  Though I have not seen a way
> to do this, I will be looking to convert them to geotiffs and shape
> files and dems with less granularity.
> 
> A geotiff loads quickly and gives the best performance in mapserver
> (from my experience anyway) if you are just looking to make things look
> more interesting.
> 
> Actually, you can download the data in Geotiff format, which is what I
> would recommend....  These might be more then what you want for
> granularity, I only dealt with 3arc and above data.
> 
> National Elevation Dataset.  I love em.
> 
> Your Tiff? Make sure it is a geotiff.  It needs to know where it is on
> the map.  If you disable TRANFORM (set it to false) in your layer it
> will probably show up.  But it needs to be a geotiff to show up properly.
> 
> Hope that helps.
> 
> -=Bill
> 
> 
> Jerl Simpson wrote:
> > Hi guys,
> >
> > I am wanting to add DEMs or some elevation/contour maps to my maps.
> > But I am curious what works best with Mapserver.  I have found several
> > different resource, but am at a loss as to which one I need.
> >
> > The first one I tried, which was to download JPEG images and convert
> > them to TIFF images, never actually show up as a layer.  This may be a
> > format issue on my part.  I haven't dug into that yet.
> >
> > I found one that is a ETOPO2 Global 2-Minute Gridded Elevation Data.
> > But I don't know what that is and not sure if it can be used.  If
> > someone knows a trick, I'd be please to find out.
> >
> > Similar issue with GLOBE files from NOAA.  Not sure if I can convert
> > them to a format that's useful to use with Mapserver.
> >
> > I'm sure there are other options, I just haven't found them.
> >
> > I appreciate any help anyone might be able to give.
> >
> > Thank you,
> >
> > Jerl
> >
> 
>