[Qgis-user] An error has occured while executing Python code:

[Paolo Cavallini]

Il 28/06/2014 00:09, Mariana Buzzi ha scritto:
> Hello everybody!!!
> 
> 
> I'm trying to calculate the NDVI with Landsat 8 image, I downloaded from
> the USGS site. The first thing to do is to rescale the values ​​of
> reflectance and radiance at TOA. So I found a plugin (PGeosud: TOA
> Reflectance). However, I used this plugin for bands 4 and 5. The study
> area is composed of three units of landscapes. Plains, valleys and
> coastal canyons where vegetation varies considerably. To avoid
> saturation of the NDVI, I made a mask of each of them and I calculated
> the index. The problem is that: when I apply the raster calculator I get
> the following error. What can I do?

Hi Mariana,
have you tried
http://plugins.qgis.org/plugins/SemiAutomaticClassificationPlugin/
?
All the best.
-- 
Paolo Cavallini - www.faunalia.eu
QGIS & PostGIS courses: http://www.faunalia.eu/training.html