[GRASSLIST:3236] Re: nice color ramp

[Nick Cahill]

I agree, it would be useful to have a library of color ramps and such. 
For whatever it's worth, here's the color ramp I use for topography of 
western Turkey. It's tailored for the specific archaeological site I 
work on (Sardis), but could be modified easily. I wanted to show the 
topographic change from flatter river valley (in the 100-200 meter 
range, greenish) to steeper hills above 240 meters or so. I mucked 
around to make it more generally applicable to western Turkey.

-32768 blue
0 blue
1 0 230 0
160 0 160 0
240 50 130 0
384 120 100 30
480 120 130 40
720 170 160 50
1600 255 255 100


Nick Cahill



On Apr 20, 2004, at 10:42 AM, Michael Barton wrote:

> This is a nice color ramp. A year or so ago, I remember someone else 
> coming up with a nice elevation color ramp. I did one for elevation 
> maps in the Spearfish demo set that has a somewhat different approach, 
> using percentages for part.
>
> A wish (maybe silly or trivial):
> It would be nice if there was someplace people could post color ramps 
> like these, and other such interchangeable files like icons so that 
> others could use them. For example, playing around I made a bug icon 
> for bugsites in the Spearfish data along with house, powerline, and 
> trowel (I'm an archaeologist) icons. I'd be happy to share them and 
> the color ramp.
>
> Michael Barton
>
> On Monday, April 19, 2004, at 10:01  PM, Multiple recipients of list 
> wrote:
>
>> From: Hamish <hamish_nospam at yahoo.com>
>> Date: Mon Apr 19, 2004  7:40:51  PM America/Phoenix
>> To: Richard Greenwood <rich at greenwoodmap.com>
>> Cc: grass list <GRASSLIST at baylor.edu>
>> Subject: [GRASSLIST:3221] Re: colors for d.his
>>
>>
>>> Could anyone provide hints for creating a nice color ramp for the map
>>> used as the hue parameter of d.his suitable for representing an 
>>> alpine
>>> valley in which the lowest elevations would be green going to brown,
>>> grey, and white for the highest elevations?
>>
>>
>> see:
>> http://intevation.de/rt/webrt?serial_num=2072
>>
>> thus,
>>
>> r.colors map=xxxx col=rules << EOF
>> -11000 0 0 0
>> -500 0 0 30
>> -100 0 0 200
>> -1 150 150 255
>> 0 0 150 0
>> 270 90 165 90
>> 300 90 175 90
>> 500 50 180 50
>> 500 70 170 70
>> 1000 70 145 75
>> 1000 70 155 75
>> 2000 150 156 100
>> 2800 220 220 220
>> 3000 255 255 255
>> 8850 255 255 255
>> nv 255 255 255
>> EOF
>>
>>
>> i.e. [elevation Red Green Blue]
>>
>> or for your suggested colors, use these rules:
>>
>> 0% green
>> 33.3% brown
>> 66.7% grey
>> 100% white
>>
>>
>> Hamish
>>
>>
> ______________________________
> Michael Barton, Professor & Curator
> Department of Anthropology
> Arizona State University
> Tempe, AZ  85287-2402
> USA
>
> voice: 480-965-6262; fax: 480-965-7671
> www: http://www.public.asu.edu/~cmbarton
>