Problem: ArcMap performance issues when using Buffer or GeoProcessing Wizards with Edge File(s) as input data (StreetMap data format)


ArcMap users will experience degraded performance when using the Buffer Wizard or GeoProcessing Wizard on Edge (.edg) Files. The following GeoProcessing operations are affected: Dissolve, Merge, Clip, Intersect, and Union.

The GeoProcessing Wizard was removed from ArcGIS starting at version 9.0. For geoprocessing you can use the ArcToolbox tools.

Starting at ArcGIS 9.0, to use the the Buffer Wizard you must add the Buffer Wizard command to an ArcMap toolbar. To do this, click Tools > Customize, select Commands, select Tools from the left hand list, drag the Buffer Wizard command from the righthand list to any ArcMap toolbar, then close the Customize dialog.


The StreetMap Edge File format is a compacted geographic data format designed specifically for storing large amounts of linear data. Edge Files support fast display and geolocating functionality; however, the format is not optimized for GeoProcessing and other map analysis operations.

Solution or Workaround

Before using the GeoProcessing or Buffer Wizards, use ArcCatalog or ArcMap to convert your Edge File data to either Shapefile or Personal Geodatabase format.

  • Using ArcCatalog:

    A. Select the street file (with an .edg extension) in ArcCatalog. The street files can be found in the \data\streets folders of the Data & Maps for StreetMap USA CD–ROM. The files are named in the format of .edg, for example, ak.edg for Alaska streets. The street data is organized by state. If you select usa.edg, it will convert all street features in the country. Right-click on the file you want to convert.

    B. Click Export and click StreetMap to Geodatabase, StreetMap to Coverage, or StreetMap to Shapefile.

    C. Click the Help button on the tool for more information, if desired, and enter the appropriate input and output parameters.

    D. Click OK when you are finished.

  • Using ArcMap:

    A. Add the StreetMap group layer to the map and zoom to the area of interest.

    B. Right-click the local streets layer on the TOC, then click Data in the context menu.

    C. Click Export Data to display the Export Data dialog box.

    D. In the Export Data dialog box, click All features in View Extent in the Export dropdown list. Click the All features option exports all street features of the country.

    E. Click the File Open button to open the Catalog Browser dialog box. Select the type of feature class being saved in the Save as Type option, then specify the output filename for the result.

    F. To export data of a specific state, add the data by the state abbreviation name, for example: ca.edg or ma.edg. In ArcCatalog, select the street file, which has an .edg extension. The street files are found in the \data\streets folders in the Data & Maps for StreetMap CD–ROM. The files are named in the format of .edg, for example, "ak.edg" for Alaska streets. The street data is organized by state. Selecting usa.edg converts all streets in the country. Right-click the layer and repeat steps C through E. Click All features option in the Export Data dialog box. ArcMap exports all the street features in the selected state.