How to create a .TAB or .GST file from scratch?

[Bradley Allen]

Hope this is the right forum to ask ow please advise;

Im trying to learn MapInfo and want to try to create a tab or gst file using a street map.  i tried this by starting a new workspace and table, running the wizard with the 5 steps?  opened a .png file of the city showing streets, then did the georeference part adding points then figuring out their location in degrees.  then 'crunching' this expecting to get a georeferenced map, i was selecting lat/long wgs84   it seemed to make a tab file, but when trying to open it elsewhere its a blank white background only.

what i would expect is to be able to take any photo of streets, do some digitizer? function to assign it a geo position, i find this by using google earth and reading the position at the mouse;  then doing some save AS and it products the .tab output

thanks for any guidance

[Ross Nixon]

There are two common types of TAB files that I use.
1. Tab files that only refer to an image file. Inside the Tab file are the image filename and the coordinates with corresponding pixel positions for the image. In your case the Tab file always requires the PNG file location.
2. Tab files that contain only digitised polylines, polygons, points. These have been drawn/traced over an existing referenced image (as in type 1 above). This creates four files: TAB, MAP, DAT, ID. After that is completed, the georeferenced image becomes an optional in your workspace.

Ross

[Bradley Allen]

Hi

yes number 2 is what Im hoping to create with those files.  i had made one as num 1, but it didnt work.  the unit displaying this is offline and cannot access any server, it has to have the map image.

Im not finding how to generate this kind of tab file

[Peter Horsbøll Møller]

If your image doesn't display when you open it in a map, it's probably because the visibility is turned off.

Open the layer control and check the visibility of the layer.

It might have a zoom layering set that prevents you from seeing the image outside a certain scale

Peter Horsbøll Møller

Pitney Bowes Software

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Date: Sun, 23 Jun 2013 19:46:06 -0700
From: ross...@gmail.com
To: mapi...@googlegroups.com
Subject: [MI-L] Re: How to create a .TAB or .GST file from scratch?

I'm not sure that I understand you, but I'll take a guess...
- Wait until the server with the PNG file is online.
- Open the TAB file you created. If you can't immediately see the PNG image, right-click the map window > View entire layer. Zoom in if necessary.
- Create a new table and add it to the current map window.
- Draw your objects: polylines, polygons etc into this new layer. (Ctrl+L 'Layer Control' shows what layers are in your map window, sometimes you need to click + to add layers that are open but not in your window).
- Save the new table; and optionally save a Workspace (This basically bookmarks what you had open and visible).

Ross

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[ktgcad]

What peter suggest could be the exact reason for image not showing up..Do the steps as suggested and result will show up..

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Kalai Selvan.K

KTG Infotech

GIS (Mineral Exploration)
Data Integration, Analysis, Capturing and Data Conversion
for Geochemistry,IP and Drill logs
Skypes-ktgcad