How to messure pixels of NDVI raster with QGIS?

[Miguel]

Hi guys,

I am using QGIS, and I’d like to messure the different areas of the NDVI layer.

Is it possible?

Thank you!

Miguel

[Saijin_Naib]

How do you mean?

There are a number of different approaches one could use.

[Miguel]

Hi Saijin,
I am working with this geotiff: https://wetransfer.com/downloads/9e73583ab4a03ed9669da994f3911c1320210816220601/c25b3514454432921bbe1cc36dd0155720210816220601/ba421f

I want to messure the area in square meters of the zones represented in red, orange, yellow, green and blue:

By using r.report I get 75 lines of results, instead the 5 results I was expecting.

Any clue on how can I get the results in the way I want?

Thanks a lot!

Miguel

[Saijin_Naib]

Could do a reclassify and then summary statistics, no?

[Miguel]

I have no idea really. Any clue on how to do that?

[Miguel]

I guess you were suggesting r.reclass, thank you!

[Miguel]

Hi Saijin,

I couldn’t do it, I keep having error messages. I use these parameters for the classification:

And this is the error I get:

Any advice? Thank you!

[Saijin_Naib]

Are you certain you can use commas instead of decimal points? I’m not sure if all tools can handle that style of number formatting.