Hi all, I am looking at getting a program called MRSID by lizardtech which
does compression etc. on image files. I see the reference below to another
program from ermapper. Does anyone have any insight as to which would be
the better product?
much thanks,
Mike Lepage, B.Sc.
Senior RF Engineer
Wireless Professional Services
Lucent Technologies
314-891-2130
[EMAIL PROTECTED]
-----Original Message-----
From: Martin Higham [mailto:[EMAIL PROTECTED]]
Sent: Thursday, September 16, 1999 7:12 PM
To: 'Steve Wallace'
Cc: [EMAIL PROTECTED]
Subject: RE: MI Seemingly Senseless Seamless
Steve,
If you are creating a seamless table from multiple rasters, then a more
efficient solution (though it would take more time to initially set up) is
to get all of your images mosaiced together, then written out to a
compressed format like ecw (ER Mapper's compressed imagery format).
ER Mapper (www.ermapper.com) provides tools for automatically mosaicing,
balancing and compressing your imagery. There are essentially no limits on
the amount of imagery you can mosaic and compress (up to TB if your system
is big enough).
Once compressed, the original 4GB of imagery will be compressed down to
about 50-100MB (or alternatively you might create a few, smaller compressed
files).
You can use the ecw compressed image in MapInfo using the freely available
plug-in called MapImagery (see www.gid.com). And the best bit is that the
compressed image displays much quicker than the original uncompressed files.
This is because the slowest part of the procedure is reading the data off
disk, and there is up to 50 times less data to read with a compressed format
like ecw.
You should be able to find a local consultant who will do the mosaicing,
balancing and compression.
Martin Higham
Manager - GIS Services
Encom Technology ph (61 3) 9428 4088
PO Box 727, Richmond fx (61 3) 9428 0470
VIC, 3121, Australia mobile 0414 624117
www.encom.com.au
> -----Original Message-----
> From: [EMAIL PROTECTED]
> [mailto:[EMAIL PROTECTED]]On Behalf Of Steve Wallace
> Sent: Friday, 17 September 1999 3:21
> To: [EMAIL PROTECTED]
> Cc: [EMAIL PROTECTED]
> Subject: MI Seemingly Senseless Seamless
>
>
> I must be going crazy. I thought that the way I used to make seamless
> tables (best method or not) was to open 1 table and use the Seamless
> Manager utility to create a new seamless table. Then, I would
> open the new
> table, select "Append to Seamless Table" and choose from the
> file dialog
> all the other files I wanted.
>
> Well, that doesn't seem to work anymore.
>
> I created a new seamless table with just one table in it. I
> went to append
> tables to it, and I get the error message, "Table yyyy is not defined
> seamless."
>
> Okay, so I create a new seamless table with some other tables
> in it, try to
> append it and get another error message, "Table yyyy is
> defined seamless.
> Seamless table xxxx cannot contain other seamless tables."
>
> This is a catch-22: you cannot append tables if they are not
> seamless, but
> they can't be seamless and append them???
>
> I think something is broken. My logic, or their code. I would
> try and write
> around the problem, but couldn't find MapBasic commands to do so.
>
> The reason why I do not just create the whole seamless table
> in one step is
> that there are almost 3,700 raster images (4 gigs) involved here.
>
> Any help greatly appreciated.
>
>
>
> Steve Wallace
> GIS & Market Information Manager
> Florida Farm Bureau Insurance Companies
>
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