WG: [UMN_MAPSERVER-USERS] Displaying elevation data

[Arnd Wippermann]

Hi,

The tools from Matthew are quite good.

To colorize a map it's also possible with Mapserver. Use colorrange or query
[pixel]

  CLASS
    STYLE
      RANGEITEM "EW_QKM2004"
      DATARANGE 140 15987
      COLORRANGE 255 255 178 189 0 38
      OUTLINECOLOR 0 0 0
    END
  END

[Quelle:http://www.geog.fu-berlin.de/de/Karto/umn_karten/choro.shtml#colorra
nge]

  CLASSITEM "[pixel]"
  CLASS
    EXPRESSION ([pixel] >= 0 AND [pixel] <  8)
    COLOR 0 255 255
  END

Mit freundlichen Grüssen

Arnd Wippermann
http://gis.ibbeck.de/ginfo/


-----Ursprüngliche Nachricht-----
Von: UMN MapServer Users List [mailto:MAPSERVER-USERS at LISTS.UMN.EDU] Im
Auftrag von Matthew Perry
Gesendet: Montag, 22. Oktober 2007 07:13
An: MAPSERVER-USERS at LISTS.UMN.EDU
Betreff: Re: [UMN_MAPSERVER-USERS] Displaying elevation data

Vishal,

 In terms of visualizing elevation data, there are a number of good options:

- create a hillshade and overlay that on the elevation layer at 50% opacity
- colorize the elevation layer (ie green to white instead of black&white)
- generate a vector contour layer

Mapserver itself is not capable of doing this processing; you can achieve
these through many other pieces of software such as GRASS, MicroDEM,  GDAL,
etc. I wrote a few custom apps for this purpose that are described on my
site : http://www.perrygeo.net/wordpress/?p=7

 Mapserver only does 2D so true 3D is not possible.

- matt

On 10/21/07, Vishal Nagpal <vishu_73ns at yahoo.com> wrote:
> I am trying to display elevation data dt1 and dt2 files.
>
> I am getting a gray scale image as output. Though it gives an 
> impression of varying heights but Is it possible to do more with it, 
> like see contours, or see 3D.
> I have tried changing scale but it only varies the shades of grey.
> Surprisingly A combine layer of tif and elevation shows some color 
> shades. I don't know why?
> Vishal
>


--
Matthew T. Perry
http://www.perrygeo.net

"Never ascribe to malice, that which can be adequately explained by
incompetence."