Problem creating seamless table MapInfo 8.5

Hello,

I'm just starting to use use MapInfo and am trying to create a seamless
table. Basically I have all the 10k raster tabs from the OS for the
British Isles and want to create a seamless table of these so I have a
complete map of Britain when required.

The method I'm using is to open up a group of tiles and then append
them to the seamless table. This seems to work to a point put then it
suddenly stops appending the tiles. I've got no idea why this is and
was advised to check in the registry for a key called MAXFILES and, if
it exists, to change the value of it to 100 to see if this resolves the
problem.

I've had a look in HKEY_LOCAL_MACHINE\Software\MapInfo\MapInfo\Common
and there doesn't seem to be an entry called MAXFILES. There is one
called MaxLevel though, this is currently set to 200.

I was also advised, by mapinfo support, to try and open all the files
at once and then create a seamless table all at once but this seems
impossible - I'm not sure how many files there are exactly but I think
there are a few thousand so opening them all at once doesn't seem to do
anything - I guess there are too many for it to handle.

Does anybody have any advice to offer?

Many thanks in advance!

Hi

I have not actually tried this out but if you create a handful of seamless
rasters together and then run the seamless mapbasic program you will find
that one of the options is to turn the seamless table off. Once you have
done this you can actually look at the seamless table itself and it will
contain a table with 2 columns ( 3 if you count the object) Essentially its
created by creating a tile object for each raster ( i.e.. the 4 coordinate
pairs inside a tab header) and the name of the table ( with or without path
depending on where your rasters are stored) and a description.
Using MapBasic you could create a utility to append the names of the rasters
into the table and insert the name of the table and description and a
rectangle object. In theory this should recreate the seamless table
structure into new table and should work.
With regards to file handlers under DOS 3.3 ( I am now showing my age) PCs
could open up 255 files and also open up I believe an equivalent number of
buffered files). However the OS itself will take up a good many of these so
assume under Windows this is your missing 55. I would imagine however since
NT based systems were derived from Unix that this is no longer a
restriction. In the old days we only had 20 file handlers !
We do write MapBasic utilities for clients and we could write such a routine
for you if its imperative you need one and are able to bear the cost of the
development time should you need a MapBasic utility developed for you. As
proof of concept you could manually create a test by inputting the values
and creating the objects for 3 or 4 rasters.

Kind Regards
Jim
www.plangis.co.uk



----- Original Message -----
Newsgroups: comp.infosystems.gis
Sent: Wednesday, July 26, 2006 9:59 AM
Subject: Problem creating seamless table MapInfo 8.5

Thanks for that info Jim. I will give it a try and let you know how I get
on.

Hi Chris

When you have created a table manually and placed some references into it.
You will need to modify the tab file using notepad and add the following
into it at the end file.

ReadOnly
begin_metadata
"\IsSeamless" = "TRUE"
"\IsReadOnly" = "FALSE"
end_metadata

Kind Regards
Jim

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