<div dir="ltr"><div><div><div><div><div>Hi all,<br><br></div>I just ran i.landsat.toar to get the radiance values for a TM5 image and I noticed that the comments in the output metadata (from <a href="http://r.info">r.info</a>) have some problem.<br>
<br></div>1) I asked for radiance output but the comments says the image is reflectance. Image values are consistent with radiance values so I believe the line in the comments is wrong.<br><br></div>2) Values for earth-sun distance, digital number range etc are all 0.<br>
<br></div>I'm using  OSGeo4W, Grass7svn revision 54962<br><br>Bellow is the output from <a href="http://r.info">r.info</a> so you can see what I mean<br>---------------------------------------------<br> +----------------------------------------------------------------------------+<br>
 | Layer:    rad2005_cor.1                  Date: Fri Feb 15 08:38:31 2013    |<br> | Mapset:   PERMANENT                      Login of Creator: daniel          |<br> | Location: corr_Atm_utm23s                                                  |<br>
 | DataBase: C:\grassdata                                                     |<br> | Title:     ( rad2005_cor.1 )                                               |<br> | Timestamp: none                                                            |<br>
 |----------------------------------------------------------------------------|<br> |                                                                            |<br> |   Type of Map:  raster               Number of Categories: 0               |<br>
 |   Data Type:    DCELL                                                      |<br> |   Rows:         7001                                                       |<br> |   Columns:      7951                                                       |<br>
 |   Total Cells:  55664951                                                   |<br> |        Projection: UTM (zone -23)                                          |<br> |            N: 7548415.00000001    S:    7338385   Res:    30               |<br>
 |            E:     623415    W: 384884.99999999   Res:    30                |<br> |   Range of data:    min = 0  max = 194.52                                  |<br> |                                                                            |<br>
 |   Data Description:                                                        |<br> |    generated by i.landsat.toar                                             |<br> |                                                                            |<br>
 |   Comments:                                                                |<br> |     Reflectance of Landsat-5 TM (method corrected)                         |<br> |    ----------------------------------------------------------------        |<br>
 |     Acquisition date ...................... 2005-05-15                     |<br> |     Production date ....................... 2012-12-01                     |<br> |                                                                            |<br>
 |     Earth-sun distance (d) ................ -0.00000000                    |<br> |     Digital number (DN) range ............. 0 to 0                         |<br> |     Calibration constants (Lmin to Lmax) .. +0.000 to +0.000               |<br>
 |     DN to Radiance (gain and bias) ........ -0.00000 and +0.00000          |<br> |     Mean solar irradiance (ESUN) .......... -0.000                         |<br> |     Reflectance = Radiance divided by ..... -0.00000                       |<br>
 |    -----------------------------------------------------------------       |<br> |                                                                            |<br> |    i.landsat.toar -r input_prefix="tm5_2005_orig." output_prefix="rad20\   |<br>
 |    05_cor." metfile="C:\projetos\agspec\correcao_landsat\LT521807620051\   |<br> |    35CUB00\LT52180762005135CUB00_MTL.txt" sensor="tm5" method="correcte\   |<br> |    d" date="2005-05-15" sun_elevation=37.184 product_date="2012-12-01" \   |<br>
 |    percent=0.01 pixel=1000 rayleigh=0.0                                    |<br> |                                                                            |<br> +----------------------------------------------------------------------------+<br>
<br></div>Thanks<br>Daniel<br></div>