Hello all,

Thank you to all those who provided helpful responses.
My question is:
How to cut this piece of area from big one?
These are the response:

You could use the geoprocessing tools available with ArcView 3.1 and 3.2.
First
make a backup copy of the current shape file. Add the geoprocessing
extension
from the extensions menu. Use the clip function (this will only work if you
have
another file that is the size you want). Alternately, use the cut polygon
function as follows:
1. make the theme you want to cut active
2. Choose start editing from the theme menu
3. Use the cut polygon function by clicking on the button with a dot on it
(should be the right-most one on the lower button bar) and holding it -
choose
the next to bottom one from the drop down selections.
4. Place the cursor outside the polygon, drag to draw a line to make the
cut.
Double click to end the line.
5. click on the area you want to delete. Hit delete (on keyboard). repeat
the
above steps until you have the size you want.
6. Save the edits (under a different name)
7. Now use the geoprocessing wizard clip function to clip the remaining
large
shapefiles, DEMs based on your new polygon. All the files will now be the
same
size.
Margaret Gooding

In general the process is "clip" -- easy enough for the polygons and
polylines
(geoprocessing wizard or Xtools extension).  I'm sure there's a similar
process
for DEMs.  good luck.
Kathi Hannaford, Union Co. GIS
khannaford@unionco.org

This can be accomplished working interactively in Arcview very easily:

1.  make the them the only active theme.
2.  working in a View document, make a rectangle using the feature selection
tool, so that the rectangle surrounds all the features you wish to keep in
your subset of the original.
3.  under the "Theme" entry in the View document's menu interface, there is
a "Convert to Shapefile..."  entry.  This will convert the collection of
features you have selected into a new shapefile.   It opens a dialog in
which  you specify the new theme's name and path to the directory where it
will be stored.   After creating the new shapefile, there will be a dialog
asking whether  you wish to add the newly-created theme to your view
document.

cheers,
robert white
Austin, Texas

All above options work well with polygons, polyline, and points. I am still
thinking about DEMs.


Nguyen Quoc Dinh
Physical Land Resources Programme
Schoofslaan, 12. Room 196
1160 Brussels
Belgium
Phone: 32 2 629 5056
email: nguyen.quoc.dinh@vub.ac.be