3d space with different resolution on each axis

[mike eschman]

mike eschman wrote:

> hello,
>
> we are developing a gis application to support
> weather event simulation in a
> hydrology model that incorporates a pumping
> system.  the initial simulation
> represents the geographic area under simulation
> as a 2d plane filled by polygons
> that define water storage areas and canal
> systems, with all water storage areas
> of constant elevation.
>
> for our next iteration, we have high quality
> elevation data available.  It is not
> ground level elevation - the heights of
> structures and other masses are reflected in
> the elevations.  These files are quite large.
>
> the original 2d plane is going to slide along
> the z axis, through a "point cloud" painted into
> a seperate surface representing the elevation
> values.  movement along the z axis represents
> changes in water level.  each water storage area
> must be able to change position on the z axis
> independent of the others.
>
> the z axis is shorter than the x and y, as
> elevation can be represented by an unsigned 8
> bit numeric
> and x and y both require 32 bit unsigned
> integers.
>
> currently, we are using polydata point sets
> (x,y,z) with coordinate values being
> unsigned 32 bit integers.  we would like to have
> the z coordinate stored as an 8 bit unsigned
> numeric, as this will save about 60 meg in the
> size of our average polydata file.
>
> comments and suggestions would be appreciated.
>
> mike eschman, engima
>
> --
> open source : truth, justice and the internet way
>
>

--
open source : truth, justice and the internet way


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