Hiii,

If you have 3D Analysis extension for ArcView3.2a, you
can do it. Otherwise you should find a free GIS
software like GRASS, SAGA GIS, etc…

First you have to create TIN model for each parameter
and from that you can create corresponding contours.

Good luck,

Hunu


--- Tejaswi <tejaswi_sh@...> wrote:

> Hello members,
> I am using ArcView 3.2a (demo version) to
> generate contour maps for different physico chemical
> parameters of groundwater samples. The contours are
> being generated by making use of the point
> interpolation method. While generating these maps
> from the database created, i am encountering this
> problem. The problem is, many of the contours are
> displaying negative values. There are no negative
> values in the database and moreover no field in the
> database is left blank. The minimum value for any of
> the parametes is zero. Eventhough for some of the
> parameters there are not even zero values, the
> negative contour values are being displayed.
> Any one knowing the solution for this problem
> is kindly requested to help me in this regard.
>
> Thanks in advance
>
> Tejaswi