Hi again,

    Thanks to Bill Huber, Humberto Perotto, Bartosz Czyzkowski, Ivan
Sidorenko, Greg Cocks  and Heather Richards for their answers.

ORIGINAL QUESTIONS :-

Hi,

    I have one grid data set with cell size 200m x 200m. Is it possible
using ArcView Spatial Analyst to
reproduce grid from orginal dataset into smaller cell size ie : 20m x
20m???


ANSWER :-
1) Bill Huber :
    Set the new cellsize in the Analysis|Properties dialog and then copy
the
grid with the map calculator.

For more control over the resampling method, use the Resample request in

the map calculator.  See
http://www.quantdec.com/SYSEN597/GTKAV/section9/map_algebra.htm#Resampling

for details.

2) Humberto Perotto :

If you have the grid transformation tool extension the you might be able
to
do it. May I ask you why would you like to resample to 20 m. You will
not be
increasing any accuracy to it.

3) Bartosz Czyzkowski :

Welcome,
try the following script:

  ' Give here the full path of the input and output grids, e.g.
  input_path = "d:/users/kualalumpur/namegrid200"
  output_path = "d:/users/kualalumpur/namegrid20"
  theSourceName = Grid.MakeSrcName(input_path)
  grid200 = Grid.Make(theSourceName)
  grid20 = grid200.Resample(20,#GRID_RESTYPE_NEAREST)
  grid20.SaveDataSet(output_path.AsFileName)

In the last but one line there's function RESAMPLE. It produces 20m cell

grid using
'Nearest neighbor' interpolation (one of three possible, have a look in
AV
help if you
want to experiment with two others).
Don't hestistate to contact me in case of problems...
Good luck
B.C.
--


4) Ivan Sidorenko :

Hello,

     Yes, it is possible. See "resample" request in Avenue.

     Write me if you have questions.

5) Greg Cocks

Set the analysis properties to the cell size you want, use the
MapCalculator, just add the GRID you want, evaluate, save the data set.

As I am sure you know though, your grid will suddenly not get 10 times
more
accurate - i.e., the scale of the data will still be at 200 metres.

Regards,
GREG...

6) Heather Richards

I may be wrong, but I think if you opened the file in WordPad, you can
change the header part of the file to set the cell size to whatever you
want.