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How do I create DEM for contours after converting map-info tab files to ARC GIS and how do I convert toposheet tab file to ARC GIS.

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There are answers on this subject already. gis.stackexchange.com/questions/42/… etc. Have a look on the forum first. – Tomek Feb 10 at 10:14
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Use ArcGIS Data Interoperability Extension to convert mapinfo tab files to arcgis compatible. Then use XToolspro to create dem from contour.

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Their are any papers based on this – sharma Feb 18 at 4:09
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If licensing is available then Data Interoperability or FME to convert data from MapInfo TAB seems like a way to go.

To turn the contours into a DEM you may want to consider the Topo to Raster tool that is described in more detail here but needs a 3D or Spatial Analyst license to use.

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