Hi Steve,
The normal method is opening all tables in a single mapper, and let MapInfo build the
seamless table for you. However, in some
circumstances it may be more feasible to make it manually.
If the grid's regular, you can use one the readily many grid tools available.
Otherwise you're forced to digitize a new seamless
table. But in any case, it's pretty easy to manufacture a custom seamless yourself.
A seamless table is "just" a regular mappable table, with two string columns,
typically:
Table Char (100)
Description Char (25)
and
a map consisting of region objects, showing the extent of the underlying tables.
The first column contains the pathname to the TAB file without extension (the path is
optional, and can be both absolute and
relative), and the second column contains the proposed MapInfo table name.
To designate the table as a semaless table, the following metadata needs to be present
:
begin_metadata
"\IsSeamless" = "TRUE"
end_metadata
So, if necessary, you can go ahead and digitize your seamless coverage as a normal
table, digitizing the extent for each new table,
and fill in the necessary column info. Then close the table, add the metadata, and you
have a seamless table when you reopen it.
Seamless tables are very sensitive to many things, among which are:
- all tables need to have the exact same projection if you want to avoid problems
- non-existent source tables will make MIPro refuse to open the seamless table
- un-aligned rasters will foul up your display on the edges; MIPro's handling
un-aligned seamless raster is worse than how it
handles regularly opened un-aligned rasters
Best regards/Med venlig hilsen
Lars V. Nielsen
GisPro, Denmark
http://hjem.get2net.dk/lars-online/
http://www.gispro.dk/
WGS84: 10.20'40"E 55.20'20"N
----- Original Message -----
From: "Morrier, Steve" <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Friday, November 01, 2002 10:17 PM
Subject: MI-L Creating a Grid for Orthophotos
> Hi All,
>
> I have about 140 orthophotos for an area. I would like to create a grid file
> to represent the location/coverage of the orthophotos. Is there a simple way
> to do this? Since they are orthophotos there is a small amount of overlap
> between photos and most of the photos are of slightly different sizes and
> dimensions. I really want a grid file to use as a hotspot for clicking on
> and bringing up the appropriate orthophoto. Thanks for your help.
>
> Steve
>
> -----Original Message-----
> From: Ryan Morgan [mailto:rmorgan@;aerialsexpress.com]
> Sent: Friday, November 01, 2002 1:06 PM
> To: [EMAIL PROTECTED]
> Subject: MI-L Free Grocery/Big Box Store Data
>
>
> Does anyone know of, or have access to either a list of U.S. grocery / big
> box stores or, even better, a table with centroids?
>
> Thanks for any help,
>
> Ryan Morgan
> Aerials Express
> www.AerialsExpress.com
> 888.482.2336
>
>
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