Great idea. Needs a couple of steps though. First is the creation of the
needed reference gird and color numberization. Next you need a "clumping"
tool to define areas of adjacent color. Lastly you need a raster to vector
conversion if raster while faster is not as corrector....
MidNight Mapper
aka Neil
Damian Skeeles wrote:
> Hi,
>
> I'm looking for a way to calculate the area of certain
> colours within a raster file - say, for example, areas
> of colour-coded districts from a scanned city map.
> Then, from this, if possible, I'd like to split the
> areas up further using Mapinfo polygons.
>
> There's two ways I can see of getting the area : one
> would be to count the number of pixels of a particular
> colour, and from the resolution, work out the area
> that is that colour. The other would be to convert
> every colour to a polygon using some sort of
> edge-detection toolbox, and then work on the polygon
> as normal. Does anyone know of any Mapinfo toolboxes
> available or any other means to do either of these
> tasks?
>
> Damian
>
> (PS. Could any replies be cc:ed to me as I sometimes
> miss the list feed).
>
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