...
Will use smoothing of cube at end of gridding.
exc [ [exrad] value] | [nod number_of_nodes]
Exclude points at grid nodes closer than than (exclude radius) value (or specify number of nodes) to achieve a smoothing effect. If value or nod is omitted only the grid node to be smoothed is excluded and the 8 remaining grid nodes in the 3x3 grid node pattern (default) are used to evaluate the grid node using the parabolic interpolator unless the mav argument is used. grp exc is often run as an extra smoothing step after the gridding.
exc ... neb [number_of_border_nodes]
Smoothes like grp exc but will not smooth at the border (no exclude points at border). Default is 1 node, but neb 'number_of_border_nodes' will set the no_smoothing_zone higher. Thus with this argument one can extract a part of a grid and smooth it with grp exc neb and insert it into the grid (using rep lo grid) without having any unpleasant transition zone where the grid is inserted.
log log_number
List info in message area. Gives a message for each log_number grid line.
son
Use sonar sorting of input. This is default for size of input points greater than 1000.
2dc
Input is 2D contour lines with values.
2d
Input is 2D lines f.inst. from seismic.
nsc number_of_sectors
For sort grid aplication: number_of_sectors used in interpolation.
mnp max_number_of_points
For sort grid application: max_number_of_points used in interpolation.
cvf closed_value_faults
Use closed_value_faults traces with values in workspace as input.
fast
Fast gridding. Internal parameters are trimmed to give a fast result.
ext [par | mav] [ref referencegrid]
Extrapolate a grid inside the outline of the grid. Input is a grid. Will use the CMOS algorithm for a smoother extrapolation as default.
par | mav - Will use the parabolic or moving average algorithm for faster performance.
ref referencegrid - Apply the reference grid referencegrid to tell where the extrapolation should be done. Any referencegrid that does not match input grid in size will lead to the following error message (as an example):
"2034558 2867380 Unequal number of points in the two grids
while executing
grp ext ref referencegrid"
int [par] [poi points] [cpo closedpolygons] [ext]
Interpolate holes in a grid. Input is a grid. Default interpolator is the CMOS algorithm for a smoother interpolation.
par - Use parabolic algorithm for quick solution if only very small holes.
poi points - Interpolate only holes where a point is present in workspace data points.
cpo closedpolygons - Interpolate only holes where a closed polygon is present in workspace data closedpolygons.
ext - will first perform interpolation to fill in interior holes; then extrapolation to extrapolate until grid frame.
mrf
See argument mrf in the son command.
Examples
Ex.1: Point gridding
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mak ran 11 ;# Make 11 random points grp 50 50 ;# Make a grid of 50 50 nodes |
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# Point model gridding
z ;# Erase screen
win demo ;# Get demo window (450000 460000 6450000 6460000 1000 4000)
mak ran 22 ;# Make random points
poi ;# Display points
grp 70 70 ;# Make grid
map ;# Misplay map
cco map rev tit {Depth} ; # color code type map, reverse color and title
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The above example produces this image.
Examples of parabolic gridding
Ex.2: Interpolation of interior holes
To test the command grp int one can try the following script. Go to File > New Text Editor and paste in the script. Then right click and perform Execute.
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xwi sel ;# force the graphic window in front z ;# erase the screen vie 2 1 1 ;# make 2 x 1 viewports and select the first win demo ;# make demo window mak ran 222 z 1000 4000 ;# Make 222 random points between 1000 and 4000 grp 333 444 ;# Make a grid of 333 x 444 nodes eli lt 1500 ;# eliminate lower than 1500 mhi gg ;# save in gg acm s 1750 500 4000 ;# color bands starting from 1750 and step by 500 sma i 125 ;# spline contours with increment 125 vie 2 con ;# select viewport 2 and connect to 1 grp int ;# grid and interpolate holes acm s 1750 500 4000 ;# color bands starting from 1750 and step by 500 sma i 125 ;# spline contours with increment 125 |
The above example produces this image.
Examples of interpolation of holes using gridding
See also
gen - Generate grid, gr3 - Grid data into 3D cube, gsu - Grid surface points, fmo - Fast modelling, trg - Triangulate point data