Global Mapper v25.0

normalized burn ratio - Landsat 8

marten
marten Global Mapper UserTrusted User
edited September 2014 in Raster Data
I'm trying to calculate NBR with Landsat 8, but only manage to produce a mono-colour output.

Has anyone else tried this succesfully? Is there a tutorial to walk one through this?

thanks,
Marten

Comments

  • DMcKittrick
    DMcKittrick Global Mapper Trainer Trusted User
    edited September 2014
    The raster calculation function in Global Mapper produces an 'elevation' layer. In other words, it creates a layer that uses one of the preconfigured elevation shaders to visualize the results of the calculation. If the currently selected shader is set to Daylight Shader, it will render a mono-color output. Try setting the shader to Atlas Shader to see if that makes a difference.

    - David McKittrick
    Senior Applications Specialist
    Blue Marble Geographics
  • asma
    asma Global Mapper User
    edited September 2014
    What are the stages of work to NBR normalized burn ratio ( ENVI 4.7) ??? urgent :'(:confused:
  • samknight
    samknight BMG Staff
    edited September 2014
    Hello Asma,
    Could you clarify your question? Are you simply asking how to do an NBR analysis?

    Regards,
    Sam Knight
    Director of Product Management
    Blue Marble Geographics
  • asma
    asma Global Mapper User
    edited September 2014
    hellp samknight,
    how to calculate normalized burn ration (envi 4.7) ????
  • JeffH@BMG
    JeffH@BMG Global Mapper Developer Trusted User
    edited September 2014
    asma,

    I'm not sure what the reference to ENVI 4.7 means. In Global Mapper, the steps to calculate NBR are as follows:
    * Load your source image layer
    * From the menu, choose Analysis / Raster Calculator. Depending on what you have loaded already, you may need to select the source layer of the imagery that you want to work on
    * In the "Set up Apply Formula Operation" section, select "NBR" from the "Add Predefined Formula" option
    * Click on the "Add Band" button
    * In the "Set up Output Grid Settings", select whichever option suits your purpose. The NBR formula will create a single band as output, in a new layer.
    * Select "OK". You will then be prompted for the bands that represent the input sources, B4 and B^, which represent the near-infrared band and the shortwave infrared band, respectively. Once you've made the selections, click "OK", and you should be on your way.

    Hope that this helps,

    ~Jeff