This document describes a QGIS plugin called "Raster legend sensitive" that changes the legend of raster layers with a palette based on the extent of the map. It calculates and displays the number of pixels and class name for each raster value within the visible extent. The user can also hide or show individual legend items and view details on each class. An example is provided using a PRODES deforestation raster for Rondonia, Brazil.

1. IBAMA Plugins for QGIS
Brazilian Institute of Environment and Renewable Natural Resources
COTIG – Coordination of Geotechnology
Plugin: Raster legend sensitive
● Description: Change the legend of raster(need have
palette) by extent of map and show/hide each item
in legend.
● Use for a raster layer with palette(“Thematic image”)
http://www.ibama.gov.br February 2016 Luiz Motta

2. Plugin: Raster legend sensitive

3. Plugin: Raster legend sensitive
Database for example
● Thematic raster - 'Prodes2014_RO_60m.tif':
● http://www.dpi.inpe.br/prodesdigital/prodes.php
● 'Select State's Mosaics', 'Select Year ' = 2014 and 'State ' = RO
● Palette:
●
Source:
http://www.dpi.inpe.br/prodesdigital/dadosn/mosaicos/class_rgb.txt
● QGIS Style – 'Prodes2014_RO_60m.qml':
https://dl.dropboxusercontent.com/u/14847115/qgis_qml/Prodes2014_RO
_60m.qml
● google_satellite.xml:
https://dl.dropboxusercontent.com/u/14847115/GDAL_WMS.zip

4. Plugin: Raster legend sensitive
● Prodes2014_RO_60m.tif (has Paletted)
● Label by 'Prodes2014_RO_60m.qml'

5. Plugin: Raster legend sensitive
● Active plugin and select 'Prodes2014_RO_60m' layer
● For each extent of map, calculate the items legend

6. Plugin: Raster legend sensitive
● Legend sensitive( all extent of layer)
● Tip show details of item
● Header item can copy description for Clipboard
Calculate for all extent of layer
'Prodes2014_RO_60m'
Layer: Prodes2014_RO_60m
Source:
/home/lmotta/data/sensitive_legen
d_data/Prodes2014_RO_60m.tif
Number Class: 23
Width: 13055
Height: 10621
Res.X: 0.000539
Res.Y: 0.000539
Value pixel;Total pixels;Class
name
0;71042441;NODATA
1;448441;d2007
2;6879325;NAO_FLORESTA
3;311628;d2008
...

7. Plugin: Raster legend sensitive
● Legend sensitive(subset of layer) Calculate for subset of layer
'Prodes2014_RO_60m' (extend:
-64.4104082036193546,-
10.4850146739631711 :
-64.3518132873013116,-
10.4342466784463870)
Layer: Prodes2014_RO_60m
Source:
/home/lmotta/data/sensitive_legen
d_data/Prodes2014_RO_60m.tif
Number Class: 7
Width: 13055
Height: 10621
Res.X: 0.000539
Res.Y: 0.000539
Value pixel;Total pixels;Class
name
2;175;NAO_FLORESTA
5;8977;FLORESTA
6;618;NUVEM
9;398;NAO_FLORESTA2
13;37;d2013
14;17;d2003
21;133;DESFLORESTAMENTO

8. Plugin: Raster legend sensitive
● Hide/Show item Legend
● All items click in Header

9. Plugin: Raster legend sensitive
● Hide/Show Forest item