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As part of a tool, I’m trying to convert a feature class to a raster based on attribute field values. I have accomplished this conversion using IRasterConvertHelper, but this is done without specifying an attribute field. So I then was able to do the conversion using the IGeoProcessor to execute ConversionTools.FeatureToRaster , but was only able to use numeric fields (i.e., tool didn’t work when a text field was selected).

Going another route, I tried dissolving the feature class based on a selected attribute field using IBasicGeoprocessor and Dissolve, but this fails with: {System.Runtime.InteropServices.COMException (0x80004005): Error HRESULT E_FAIL has been returned from a call to a COM component. (thanks ESRI, lots of help!)

Does anyone have any idea on how to accomplish the same thing as the ArcToolbox Conversion Tools Feature to Raster tool and convert a feature class into a raster based on an attribute field?

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Using IRasterConvertHelper and its ToRaster1 function, I have been able to complete this task using a numeric field (integer and decimal). Unfortunately the code doesn’t want to work with a text field and returns the error message: Item width must be greater than 0. Any thoughts? – Luther Quinn May 16 '11 at 14:10
I've never heard of a raster whose values are strings. Instead, I think summarizing the string values into an integer code, then using the codes to apply labels to an IRasterUniqueValueRenderer – Kirk Kuykendall May 17 '11 at 2:47

1 Answer

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  1. For each feature in FeatureClass, add the value from the specified field to an IDictionary; it may help to create another collection to hold the records in reverse order, so both keys and values are accessible (IDictionary)
  2. IFeatureClassDecscriptor.Create ( FeatureClass as IGeoDataset, ……)
  3. IRaster = IRasterConvertHelper.ToRaster1(FeatureClassDescriptor as IGeoDataset, ……)
  4. IRasterDataset = IConversionOp.ToRasterDataset (IGeoDataset, format, out_workspace, …..)
  5. IRaster2 = IRasterDataset.CreateDefaultRaster()
  6. ITable = IRaster2. AttribuateTable
  7. ITable.AddField(new_IField)
  8. ICursor = ITable.Search
  9. IRow = pCursor.NextRow
  10. IRow.set_Value(….)
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