grdimage: Warning: No valid values in grid

Added by Joao about 1 month ago

Hi

When I apply grdgradient I got following error:
grdimage: Warning: No valid values in grid [algarve.nc]

My script is :

gmt xyz2grd south_pt.xyz -R-10.0/-8.0/36.0/38.0 -Gsw_pt.grd -I3s
gmt grdclip sw_pt.grd -R-9.1/-8.35/36.95/37.4 -Gsw_pt_clip.nc -Sb-4981/-3000 -V

ps=algarve.eps
GRID=sw_pt_clip.grd

gmtset PS_CHAR_ENCODING Symbol

makecpt -Crainbow -T-300/850/50 -Z > tmp.cpt

gmt grdgradient $GRID -A0/270 -Ne0.6 -Galgarve.nc

gmt grdimage $GRID -R-9.1/-8.35/36.95/37.4 -Ialgarve.nc -JM6i -Ctmp.cpt -B0.5 -P -K >> $ps

gmt pscoast -R-9.1/-8.35/36.95/37.4 -JM6i -Df -P -Ba -K -S -Ia10 -Na3 -W1/0 -Da -O >> $ps
open $ps

The details of each one of the grids that I have created are:
gmt grdinfo sw_pt.nc
sw_pt.nc: Title:
sw_pt.nc: Command: xyz2grd south_pt.xyz -R-10.0/-8.0/36.0/38.0 -Gsw_pt.nc -I3s
sw_pt.nc: Remark:
sw_pt.nc: Gridline node registration used [Geographic grid]
sw_pt.nc: Grid file format: nf = GMT netCDF format (32-bit float), COARDS, CF-1.5
sw_pt.nc: x_min: -10 x_max: -8 x_inc: 0.000833333333333 name: longitude [degrees_east] n_columns: 2401
sw_pt.nc: y_min: 36 y_max: 38 y_inc: 0.000833333333333 name: latitude [degrees_north] n_rows: 2401
sw_pt.nc: z_min: -4981 z_max: 825 name: z
sw_pt.nc: scale_factor: 1 add_offset: 0
sw_pt.nc: format: netCDF-4 chunk_size: 134,134 shuffle: on deflation_level: 3

grdinfo sw_pt_clip.nc
sw_pt_clip.nc: Title:
sw_pt_clip.nc: Command: grdclip sw_pt.nc -R-9.1/-8.35/36.95/37.4 -Gsw_pt_clip.nc -Sb-4981/-3000 -V
sw_pt_clip.nc: Remark:
sw_pt_clip.nc: Gridline node registration used [Geographic grid]
sw_pt_clip.nc: Grid file format: nf = GMT netCDF format (32-bit float), COARDS, CF-1.5
sw_pt_clip.nc: x_min: -9.1 x_max: -8.35 x_inc: 0.000833333333333 name: longitude [degrees_east] n_columns: 901
sw_pt_clip.nc: y_min: 36.95 y_max: 37.4 y_inc: 0.000833333333333 name: latitude [degrees_north] n_rows: 541
sw_pt_clip.nc: z_min: -280 z_max: 825 name: z
sw_pt_clip.nc: scale_factor: 1 add_offset: 0
sw_pt_clip.nc: format: netCDF-4 chunk_size: 129,136 shuffle: on deflation_level: 3

grdinfo algarve.nc
algarve.nc: Title: Produced by grdgradient
algarve.nc: Command: grdgradient sw_pt_clip.nc -A0/270 -Ne0.6 -Galgarve.nc
algarve.nc: Remark: Normalized directional derivative(s)
algarve.nc: Gridline node registration used [Geographic grid]
algarve.nc: Grid file format: nf = GMT netCDF format (32-bit float), COARDS, CF-1.5
algarve.nc: x_min: -9.1 x_max: -8.35 x_inc: 0.000833333333333 name: longitude [degrees_east] n_columns: 901
algarve.nc: y_min: 36.95 y_max: 37.4 y_inc: 0.000833333333333 name: latitude [degrees_north] n_rows: 541
algarve.nc: z_min: 0 z_max: 0 name: z
algarve.nc: scale_factor: 1 add_offset: 0
algarve.nc: format: netCDF-4 chunk_size: 129,136 shuffle: on deflation_level: 3

Note that with grdgradient z_min and z_max are 0.

On previous version of GMT script works perfectly.

Any hint of how to fix this problem.

Yours,
João Fontiela


Replies (1)

RE: grdimage: Warning: No valid values in grid - Added by Joaquim about 1 month ago

João,

Some time ago you received an email warning that this forum is dead and that all questions from then on should be asked in the new forum https://forum.generic-mapping-tools.org. Please do that.

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