<br><div><span class="gmail_quote">On 11/28/06, <b class="gmail_sendername">Daniel Morissette</b> <<a href="mailto:dmorissette@mapgears.com">dmorissette@mapgears.com</a>> wrote:</span><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
Unfortunately the .TAB driver in OGR doesn't support appending data to<br>existing files, so you have to write the whole output file in a single<br>pass... and I don't think ogr2ogr supports multiple input layers at once<br>
so you'll have to do a bit of gymnastic to get the result you want.<br><br>Here are a couple of options using the MITAB library<br>(<a href="http://mitab.maptools.org/">http://mitab.maptools.org/</a>) directly, which is what OGR uses under the
<br>hood to read/write TAB datasets. The advantage of working directly with<br>MITAB in your case is that it reduces the chances of losing information<br>(pen/brush styles, field types, etc) when going from one format to<br>
another with OGR.<br><br>1- If you can write your own little program in VB or in C then use the<br>MITAB C API to write a program that reads in features from multiple<br>files and copies them to a single output file. The file mitabc_test.c
<br>contains sample code that shows how to open files for reading and<br>writing. Mapping this code to VB shouldn't be too hard either.<br><br>2- If you don't want to do any programming, then you can use the tab2tab<br>program to convert all your source .tab datasets to .mif/.mid. Then
<br>merge all the .mid files to a single .mid file, do the same with all the<br>.mif files, merging them all to a single .mif file after stripping the<br>headers of all the .mif files except the first one. If you merge the
<br>.mid and .mif files in the same order then you can convert the resulting<br>.mif/.mid dataset to .tab using tab2tab and you won't have lost any<br>information.<br><br><br>Oh wait... now that I have written all that, there is an easier
<br>solution: if you can then create a seamless table in MapInfo (a virtual<br>dataset that contains all your indiviual .TAB files) ... then use<br>OGR2OGR to convert the seamless .TAB dataset to a single .TAB file<br><br>
Daniel<br><br>abhay menon wrote:<br>> Hello List,<br>><br>> I have a dataset in MapInfo Tab format which has multi geometry (point,<br>> linestring and polygon) stored in it. I have to append multiple tab<br>
> files outside MapInfo since this dataset is heavy and take a lot of time<br>> in processing (also the table structure for all the files are same in<br>> MapInfo Tab format)<br>><br>> Is there a way I can do this using OGR?
<br>><br>> I have tried to store this data in SQLite and then thru SQLite3.exe I<br>> merge the tables into one new table but I lose the MapInfo Tab Table<br>> Structure(especially the field size) in this process which is important
<br>> for further purpose.<br>><br>> Also tried that with GML too. but it increase the number fields in data<br>> structure available (FID of all the TAB's are also inserted as FIELD's)<br>> and also it seem to induce some extra feature.. even thought they are
<br>> not visible..<br>><br>> So I need that data final MapInfo TAB. Can anyone help me with this..<br>><br>> --<br>> Thanks and Regards<br>><br>> Abhay Menon<br>><br>><br>> ------------------------------------------------------------------------
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http://lists.maptools.org/mailman/listinfo/gdal-dev</a><br><br><br>--<br>Daniel Morissette<br><a href="http://www.mapgears.com/">http://www.mapgears.com/</a><br>_______________________________________________<br>Gdal-dev mailing list
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<br><br clear="all">Thanks Daniel, <br>
<br>
Well I tried the last option and it worked really well..<br>
<br>
<br>
-- <br>
Best Regards<br>
<br>
Abhay Menon<br><br>