[GRASSLIST:110] Re: making a "true-color" landsat composite

[Thomas Adams]

Markus,

I believe the climatol R package will do rose plots.

Tom

Markus Neteler wrote:
> Dylan,
>
> On Tue, Mar 14, 2006 at 10:04:52AM -0800, Dylan Beaudette wrote:
>   
>> Markus,
>>
>> Nice images!
>>
>> a couple things:
>>
>> 1. the link at the top of the page had some interesting polar plots.
>> For hard copy I found that ps.rose in the GMT suite produces excellent
>> results as well:
>> http://169.237.35.250/~dylan/NPS/day100.png
>>     
>
> yes, there is also some R extension for that.
> I just thought to have it directly in GRASS (6.1-CVS).
> Someone may change the xgraph output to d.graph for consistency,
> cannot be hard (hey, maybe you?).
>  
>   
>> 2. the color boost technique -- is your script available on the GRASS
>> wiki somewhere, or in the grass scripts dir in a recent CVS branch?
>>     
>
> Sure...
>
>   
>> This looks like it will do the trick, now the only problem is that I
>> have just put together the entire state of Arizona with the poor
>> looking imagery!
>>     
>
> Sorry - I had written the script three weeks ago but didn't advertise it
> yet.
>
>
> I have added parser support today, get it now from
> http://mpa.itc.it/markus/grass61/demos/
> -> i.landsat.rgb
>
> 6.1-CVS is needed as it uses a new feature of r.univar.sh.
>
>   
>> thanks for the tips,
>>     
>
> cheers
>
>  Markus
>
>
>  
>   
>> Dylan
>>
>>
>> On 3/14/06, Markus Neteler <neteler at itc.it> wrote:
>>     
>>> Dylan Beaudette wrote:
>>>
>>>       
>>>> Hi everyone,
>>>>
>>>> I was working on constructing some "true color" landsat composite images today
>>>>         
>>> >from bands 3,2,1 -- and came across some strange inconsistencies. Data from
>>>       
>>>> one source produces "nice" true color images:
>>>>
>>>> http://casoilresource.lawr.ucdavis.edu/drupal/node/211
>>>>
>>>> whereas, another source produces somewhat muddy true color composites. I tried
>>>> playing a bit with an equalized grey colormap for each band via r.colors
>>>> color=grey.eq with the following results:
>>>>
>>>> http://casoilresource.lawr.ucdavis.edu/drupal/node/215
>>>>
>>>>
>>>> Does anyone have any tips on how to tweak color ramps for the various bands so
>>>> as to get a better looking "true color" composite?
>>>>
>>>>
>>>>         
>>> how do you like this LANDSAT:
>>>  http://mpa.itc.it/markus/grass61/demos/
>>>  -> LANDSAT 7 color boost
>>> ?
>>>
>>> Markus
>>>
>>>       
>
>   


-- 
Thomas E Adams
National Weather Service
Ohio River Forecast Center
1901 South State Route 134
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