How i can replace "-NaN" pixels with the desired value?

[adel.naseri]

HI

I have masked water in an image and now i want to replace all masked pixels with a desired values..

 

how i can do this in ENVI Preferably or other Softwares?

 

thanks in advance

Edited April 30, 2016 by adel.naseri

[bejokaryo]

we can use envi classic with band math.

for example given band1 (b1), masked value = 0, replace value with 10. use band math (b1 eq 0)*10.

then add the image with the non masked (b1 ne 0)*b1.

adding both image will combine masked and non masked images. you can also directly add both using formula ((b1 eq 0)*10 + b1).

eq means equal.

ne means not equal. just check envi help

[mamadouba]

If the masked values are actually NAN in ENVI, and not 0, you can use the following expression (example replaces NAN with 999 and all other values are preserved):

 

(999 * finite(b1,/nan))+(finite(b1)*(b1 > (-1e+34)))

[sigologo]

If the masked values are actually NAN in ENVI, and not 0, you can use the following expression (example replaces NAN with 999 and all other values are preserved):

 

(999 * finite(b1,/nan))+(finite(b1)*(b1 > (-1e+34)))

Yes Sr on Band Math.....

(0 * finite(b1, /nan))+(finite(b1)*(b1 > (-1e+34))).....