On Mon, 28 Aug 2000, Bill Thoen wrote:
> Another one!
>
> -------- Original Message --------
> Subject: MI - Map/Image to GRASS conversion
> Date: Mon, 28 Aug 2000 09:35:52 EDT
> From: [EMAIL PROTECTED]
> To: <[EMAIL PROTECTED]>
>
> Good morning Listers,
> Does anyone know of a means by which I can take MapInfo map/image
> files and convert them to the GRASS format, i.e., a rastar cell
> matrix accompanied by a header that contains the matrix's metadata?
Swen, et. al,,
Such a converter is about 65% finished; I hope we'll have a working
version within two weeks.
The filter will convert MI export format (*.mif/*.mid) to GRASS vector
format (point, line and polygon). The difficulty has been that GRASS
maintains topology (as does ESRI's ARC/Info) and MapInfo does not. Points
and lines are no-brainers; those I've had working for some time now.
But, in a MI region, there's one line that encloses an area. Adjacent
areas are also closed by a single line which over/under-lays the common
lines. These single lines need to be separated into an arc-node format. This
way, common arcs are related to the polygons on either side. It's a
non-trivial exercise and there's a fellow in the UK who has a much better
handle on this than I do (he wrote the Shapefile -> GRASS filter). So, we're
working together on this.
The ball's been in my court for several weeks now. Unfortunately, the
crass interruptions of making a living to pay the mortgage and other
creditors keeps me from spending all my time coding. Sigh. :-)
Stay tuned. Details at 11.
Rich
Dr. Richard B. Shepard, President
Applied Ecosystem Services, Inc. (TM)
Making environmentally-responsible mining happen. (SM)
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