Martin Higham posted the email message a few months ago regarding the
comparison between ER Mapper and MrSID.
Certainly, having the read the extensive comparison report, ER Mapper comes
out the much better product.
Happy reading.
Sheila Quan
Senior GIS Consultant
Steer Davies Gleave
============================================================================
=========
Is MrSID the best compressed imagery format ?
A comparison between MrSID and ECW (Earth Resource Mapping's compressed
imagery format) is available at
www.ermapper.com/product/ermapper6/ecw/index_vs.htm
There's some evidence here that the ECW format, and the reading/writing
support provided for it by Earth Resource Mapping, offers significant
quality, speed and cost advantages over MrSID.
The comparison indicates that ECW provides:
** Better image quality **
Quicker compression
** Much quicker decompression/display **
Free compressor (for images 500MB or less)
** Free ECW plug-ins for eg. MapInfo, ArcView, PhotoShop
available
Take a look !
Note: Encom Technology is a National reseller for ER Mapper.
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: Lepage, Mike L (Mike)** CTR ** [SMTP:[EMAIL PROTECTED]]
> Sent: 17 September 1999 13:50
> To: [EMAIL PROTECTED]; 'Steve Wallace'
> Cc: [EMAIL PROTECTED]
> Subject: RE: MI Seemingly Senseless Seamless
>
> 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
> >
> > ----------------------------------------------------------------------
> > To unsubscribe from this list, send e-mail to
> > [EMAIL PROTECTED] and put
> > "unsubscribe MAPINFO-L" in the message body, or contact [EMAIL PROTECTED]
> >
>
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