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<html><head><title>MapInfo TAB and MIF/MID</title></head><body bgcolor="#ffffff"><h1>MapInfo TAB and MIF/MID</h1>MapInfo datasets in native (TAB) format and in interchange (MIF/MID) formatare supported for reading and writing. Update of existing files is not currently supported.<p>Note: In the rest of this document "MIF/MID File" is used to refer to apair of .MIF + .MID files, and "TAB file" refers to the set of files for a MapInfo table in binary form (usually with extensions .TAB, .DAT, .MAP, .ID,.IND).<p>The MapInfo driver treats a whole directory of files as a dataset, and a single file within that directory as a layer. In this case the directoryname should be used as the dataset name. <p>However, it is also possible to use one of the files (.tab or .mif) in a MapInfo set as the dataset name, and then it will be treated as a dataset with one single layer.<p>MapInfo coordinate system information is supported for reading and writing.<p><h2>Creation Issues</h2>The TAB File format requires that the bounds (geographical extents) of a newfile be set before writing the first feature. However, there is currentlyno clean mechanism to set the default bounds of a new file through the OGRDataSource interface. <P>We should fix the driver at some point to set valid default bounds for each projection, but for the time being, the MapInfo driver sets the followingdefault bounds when a new layer is created:<UL> <LI>For a file in LAT/LON (geographic) coordinates: BOUNDS (-180, -90) (180, 90) <LI>For any other projection: BOUNDS (-30000000, -15000000) (30000000, 15000000)</UL><p>If no coordinate system is provided when creating a layer, the projectioncase is used, not geographic which can result in very low precision ifthe coordinates really are geographic. You can add "-a_srs WGS84" to the<b>ogr2ogr</b> commandline during a translation to force geographic mode.<p>MapInfo feature attributes suffer a number of limitations:<P><ul><li> Only Integer, Real and String field types can be created. The variouslist, and binary field types cannot be created.<p><li> For String fields, the field width is used to establish storage size inthe .dat file. This means that strings longer than the field width will betruncated.<p><li> String fields without an assigned width are treated as 254 characters.<p></ul>To create MID/MIF instead of TAB files use the dataset creation option"FORMAT=MIF". <p><h3>See Also</h3><ul><li> <a href="http://mitab.maptools.org/">MITAB Page</a><p></ul></body></html>⌨️ 快捷键说明
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