Leslie,
Mercator Geosystems has developed several plug-ins for MapInfo based on its
.mig file type.
> Specific questions on .mig files
OK... Shoot:
(1) what is the size limit?
There seems to be no set limit. However, the process of creating large grids
of say 2000x2000 points requires a lot (70MB+)
of temporary disk space.
(2) is the limit related to the IDW algorithm?
No, the IDW is juist one way of interpolating point data into a grid.
(3) are there alternative algorithms?
Yes, we have produced the following grid based products:
- HotSpot: Creates grids based on the spatial density of points. Used in
crime analysis and marketing
- GridContour: Can create contour maps from any mig files such as
imported DEM.
- Triangulator: Calculates Delaunay triangles from point data and, among
others, interpolates these into a MapInfo Grid
You can also use the the DEM to Grid tool that comes with MapInfo 5.5 to
convert DEM's to *.mig files.
> (4) has anyone written a .mig loader, say from a point file?
Yes we have see question 3 :)
Hope this helps,
Roeland
Roeland van der Spek
Mercator Geosystems
www.mercatorgeo.nl
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