QGIS : Set Zero values to Null using Raster calculator 替換數值

Press Ctrl+Alt+M open commander

Open Processing algorithm: Raster calculator

QGIS 2.8.x 

QGIS 2.10.x 

• Main input layer 

select source layer ( as variable a )

• Additonal layers 

(not set)

• Formula 

ifelse(eq(a,0), 0/0, a)

if a == 0 then output = none else output = a

• Result 

The resulting layer

Note :

eq(x, y) - if x=y the result is 1.0, else 0.0

ifelse(c, x, y) - if c=1 the result is x, else y

0/0 == none

Reference Link :

17.10. The raster calculator. No-data values