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The output from my landscaping modeling program is simply way too big to be rendered by Paraview. So I am wondering is there anyway that I can import it into ArcMap. The data is divided into several files, with one .nodeinfo file which contains x-y coordinates and other files contain data but in the same order. I can re-arrange them into a |x|y|value| format from Matlab, but I don't know how can I import this into ArcMap.

This is just like the reverse version of "Export Feature Attribute to ASCII" function in ArcMap.

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add the data as txt or csv.
then right click and "display xy"

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You can Format you data as CSV file then import them through Qgis, then export layer as Shapefile using Save as a SHAPEFILE, then add the shapefile to Arcmap.

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    you can do the same in arcmap – Brad Nesom Dec 13 '13 at 19:14
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If you have Line or Polygon data, ArcMap Add XY Data will not work. However, there is a free tool from ESRI, Create Features From Text File. sample tools. You can find the text file formatting online, search ArcGIS 9.2 help.

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This topic explain table formats that ArcMap can read.

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