[mapserver-users] displaying postgis-DEM-raster

[Ben Madin]

I could be wrong, but this would appear to be mostly a question about what
you are trying to display...

For example, if you were trying to show other data, but on a dem you might
want to scale the vertical axis to minimise the distortion and any
obscuring of important data.

If you are trying to show the extremes of the ?landscape? you might want to
scale by standard deviation. If the extremes are not so important, you
might want to try a log transformation based on your mean. This can
certainly help when you have a non-parametric distribution. Again, it would
probably also depend on whether the outcome was for mountaineers or
kayakers when choosing you transformation parameters.

Hth

Ben



On Monday, June 1, 2015, Ahmet Temiz <ahmettemiz88 at gmail.com> wrote:

> hello
>
> How can I display postgis-DEM-raster map that has wide range elevation
> data ?
>
> as :(DEM data)
> < Minimum=1.000, Maximum=5121.000, Mean=1133.750, StdDev=655.812  >
>
> Can you give me hints ?
>
> kind regards
>
> --
> Ahmet Temiz
> Jeoloji Müh.
> Afet ve Acil Durum Yönetimi Başkanlığı
> Bilgi İşlem  Dairesi Başkanlığı-CBS Grubu
>
>
> ________________________
>
> Ahmet Temiz
> Geological Eng.
> Information Systems - GIS Group
> Disaster and Emergency Management
> of Presidency
>


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