[GRASS-user] Image ratio

GRASS GRASS user
1

HI,
How to do image rationing between two bands 5/2 of landsat in grass. I used this command ( r.mapcalc “ratio5_2=1.0*p126r046_7t20010929_z48_nn50/p126r046_7t20010929_z48_nn20”
d.erase
d.rast ratio5_2)

but it doesn’t work

The successful revolutionary is a statesman, the unsuccessful one a criminal.

2

On Sat, Sep 28, 2013 at 8:56 AM, Vinay Elothunkal <vinay223333@gmail.com> wrote:

HI,
How to do image rationing between two bands 5/2 of landsat in grass. I used
this command ( r.mapcalc
"ratio5_2=1.0*p126r046_7t20010929_z48_nn50/p126r046_7t20010929_z48_nn20"
d.erase
d.rast ratio5_2)
but it doesn't work

Could you elaborare on "it doesn't work"?

Markus

3

HI,

I am beginner of grass GIS. I would like to do the image rationing. I followed the above command but shows some syntax error. how can I go with image rationing in grass for landsat image.

thanks

···

On Sat, Sep 28, 2013 at 6:19 PM, Markus Neteler <neteler@osgeo.org> wrote:

On Sat, Sep 28, 2013 at 8:56 AM, Vinay Elothunkal <vinay223333@gmail.com> wrote:

HI,
How to do image rationing between two bands 5/2 of landsat in grass. I used
this command ( r.mapcalc
“ratio5_2=1.0*p126r046_7t20010929_z48_nn50/p126r046_7t20010929_z48_nn20”
d.erase
d.rast ratio5_2)
but it doesn’t work

Could you elaborare on “it doesn’t work”?

Markus

–

The successful revolutionary is a statesman, the unsuccessful one a criminal.

4
···

As Markus mentioned, please fill in more details:

  • What version of GRASS, on what operating system?
  • What have you tried?
  • What error message or result are you getting?
  • What are you trying to achieve?

On 09/28/2013 06:42 PM, Vinay Elothunkal wrote:

HI,

I am beginner of grass GIS. I would like to do the image rationing. I followed the above command but shows some syntax error. how can I go with image rationing in grass for landsat image.

thanks

On Sat, Sep 28, 2013 at 6:19 PM, Markus Neteler <neteler@osgeo.org> wrote:

On Sat, Sep 28, 2013 at 8:56 AM, Vinay Elothunkal <vinay223333@gmail.com> wrote:

HI,
How to do image rationing between two bands 5/2 of landsat in grass. I used
this command ( r.mapcalc
“ratio5_2=1.0*p126r046_7t20010929_z48_nn50/p126r046_7t20010929_z48_nn20”
d.erase
d.rast ratio5_2)
but it doesn’t work

Could you elaborare on “it doesn’t work”?

Markus

–

The successful revolutionary is a statesman, the unsuccessful one a criminal.

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