gsu - Grid surface points

Name

gsu — Grid surface points

Syntax

gsu [inc] | [nx ny] [trend trendgrid] [ref referencegrid]

Description

General gridding command from input points using a minimum curvature algorithm into a grid surface. The gridding can also try to follow a trend grid that is placed in workspace. The algorithm has good extrapolation qualities as shown in the example.

Arguments

No arguments.

The grid will have the same number of rows and columns as the last grid that set the @nrow @ncol variables.

inc xinc yinc

Create grid model grid with increments xinc and yinc .

nx ny

Create a grid with nx times ny grid cells.

trend trendgrid

Apply a trend grid in workspace trendgrid for the gridding process.

ref referencegrid

Apply a reference grid in workspace referencegrid for grid layout. Dimension of the grid is taken from the referencegrid.

Examples

Ex.1: Grid surface interpolating points

# Surface model gridding
z                 ;# Erase screen
win demo          ;# Get demo window (450000 460000 6450000 6460000 1000 4000)
spe bgc whi       ;# Specify background color to white
mak ran 11        ;# Make 11 random points
poi 2             ;# Display point with size width 2
gsu 222 222       ;# Make grid of dimension 222 x 222
map               ;# Map the grid

The above example produces this image.

Grid surface example