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grid data generation
blockmedian xyz.prn -R975/1035/985/1045
-I0.5 > xyzm.prn
surface xyzm.prn -Gbudo.grd -R -I0.5 -T0
grdinfo budo.grd
kojiok% grdinfo budo.grd
budo.grd: Title: surface
budo.grd: Command: surface xyzm.prn -Gbudo.grd -R975/1035/985/1045 -I0.5
-T0
budo.grd: Remark:
budo.grd: Normal node registration used
budo.grd: grdfile format # 0
budo.grd: x_min: 975 x_max: 1035 x_inc: 0.5 units: user_x_unit nx: 121
budo.grd: y_min: 985 y_max: 1045 y_inc: 0.5 units: user_y_unit ny: 121
budo.grd: z_min: 993.287 z_max: 1001.54 units: user_z_unit
budo.grd: scale_factor: 1 add_offset: 0
surface command creates regularly spaced binary grid data from irregulary
distributed
ASCII-xyz survey data. To prevent aliasing, the xyz data are treated
with bolckmedian.
-I0.5 is grid spacing by 0.5 m. surface creates -Ggridfile. -T0
is a tension value to adjust
interpolation. -Gfilename defines output grid filename.
grdinfo shows parameters of the grid file.
Normal node registration: Z-values on intersections of grid lines. n={(xmax-xmin)/increm}+1
Pixel node registration: Z-values in the center of each grid. n={(xmax-xmin)/increm}
Z-values are correct.
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