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I have made a floodmap in ArcMap 10.4 and I would like to export it to ArcGIS Online. I tried, but it keeps saying ....shp can't be exported because it has no prj file. How do I create a prj file from normal shapefiles?

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The .prj file will be created automatically if you define your shapefile's coordinate system, either by

  • opening its properties in ArcCatalog/Catalog window: Double-click the shapefile to open its properties, click the 'XY Coordinate System' tab and select the appropriate coordinate system.

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Both methods require you to know what the coordinate system of your shapefile is, of course.

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  • and of course, assume that the user knows what coordinate system the data is in! – nr_aus Aug 11 '20 at 6:57

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