arcgridwrite

arcgridwrite(fileName,X,Y,Z)- converts data in a matlab
grid into a text file in Arc ASCII Grid Format.

INPUTS
fileName: output filename including extension
X: X coordinates (vector 1 x N)
Y: Y coordinates (vector m x 1)
Z: gridded data (m x n)

SYNTAX AND OPTIONS
arcgridwrite('D:\tools\bathyGrid.asc',X,Y,Z)

arcgridwrite(...,'precision',5) - changes default output
from 3 to 5 decimal places.

arcgridwrite(...,'nodata',-32768) - changes no data value
from -9999 (default) to -32768.

arcgridwrite(...,'grid_mapping','center') - changes the
grid spatial reference from 'corner' (default) to 'center'.
This is useful when combining output from the mapping
toolbox's PIXCENTERS function.

EXAMPLE 1 - create a raster grid of the peaks function
[X,Y,Z]=peaks(100);
arcgridwrite('peaksArc.asc',X(1,:),Y(:,1),Z,'precision',5)

NOTES
Because the Arc ASCII format has only one parameter for cell size,
both X and Y must have the same, non-varying grid spacing.