[Qgis-user] Visualize Raster Timeseries with Standard Min/Max Values

[Agustin Lobo]

There is also plugin multiqml
http://gis-lab.info/qa/qgis-multiqml-eng.html
Agus

El día 27 de febrero de 2012 23:01, Alister  Hood
<Alister.Hood at synergine.com> escribió:
>> Date: Sun, 26 Feb 2012 08:47:49 -0800 (PST)
>> From: dpan <davepanitz at yahoo.com>
>> Subject: [Qgis-user] Visualize Raster Timeseries with Standard Min/Max
>>       Values
>> To: qgis-user at lists.osgeo.org
>> Message-ID: <1330274869657-4510586.post at n6.nabble.com>
>> Content-Type: text/plain; charset=us-ascii
>>
>> Hi all,
>>
>> I have raster data for a single, continuous variable (e.g. tmean in May) for
>> a particular region of interest. I'd like to visualize the progression of
>> May tmean across several years with a grayscale or color ramp, to show how
>> it changes through time.
>>
>> qGIS by default stretches and clips each raster's grayscale ramp to the Min
>> and Max values for that raster. So each ramp has different Min/Max,
>> complicating comparison between years.
>>
>> I thus want to standardize the Min/Max values across the entire dataset. The
>> only way I've found to do this is to determine the Max and Min values for
>> the entire dataset, then enter those Min/Max values in Layer
>> Properties>Style for each raster.
>>
>> This is obviously impractical for large datasets (even for small ones,
>> really). How do I do this correctly, so I can easily generate visual
>> timeseries of a variable of interest?
>
> You should be able to just style one layer with sensible Min/Max values, save the style, and make a series of copies of the resulting .qml file, named after each raster image.  You should be able to make those copies at the command prompt with a single command ;)
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