i added the following points to ArcMAP using "Add XY Data".
x,y,z 7,39,117 27,17,122 27,61,123 46,36,136 52,14,138 55,46,141 56,56,137 65,24,144 65,36,145
Changed raster output size in "options" through "spatial analyst" as follows
Left 0 Bottom 0 Top 70 Right 70
And cell size as follows
Cell size: 10 Number of rows: 7 Number of columns: 7
Then got two rasters with IDW interpolation. First with the following options:
Z value field: z Power: 2 Search radius type: Variable Number of points: 3 Maximum distance: Empty Output cell size: 10
Second raster with the following options:
Z value field: z Power: 2 Search radius type: Fixed Distance: 1 Minimum number of points: 3 Output cell size: 10
Compared two rasters outputted using above two options for IDW interpolation by converting the rasters to ASCII files. Results are different. Can anyone explain why? thanks in advance!!!