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  1. Home
  2. Knowledge Base
  3. GeoHECRAS
  4. Georeferencing Storage Areas

Georeferencing Storage Areas

When the software imports a model, it automatically places the storage areas on the Map View. However, if the original model was not spatially georeferenced, the storage areas will not align with any loaded background base map. While the software can operate without any issues in this situation, the user may prefer to have the storage areas being georeferenced to the background base map. Therefore, it may become necessary to georeference the imported storage areas.

The Georeference Storage Areas command is used to manually georeference each of the storage areas to the background base map displayed in the Map View. The process of georeferencing a storage area to the Map View can be a trial-and-error process—especially when the exact location of the original storage area is not known. Using the Georeference Storage Areas command, this process is accelerated.

This article describes how to georeference the storage areas in GeoHECRAS software. This command works similarly for GeoHECHMS software.

Note that a CRS should be assigned prior to running this command. Otherwise, the software will display the below informational dialog box.
CRS not assigned to HEC-RAS model

Refer to this article in our knowledge base to learn about how to assign a coordinate reference system to a project.

Follow the steps below to georeference an existing storage area:

  1. From the Input ribbon menu, click the Storage Areas menu item and then select the Georeference Storage Areas command.
    Input ribbon menu - Georeference Storage Areas command
  2. The Georeference Storage Areas dialog box will be displayed.
    Georeference Storage Areas command dialog box
  3. Click the [Pick] button adjacent to the Storage area ID dropdown combo box.
    [Pick] button
  4. The Georeference Storage Areas dialog box will temporarily disappear, and a prompt will be displayed on the status bar instructing the user what to do next.
  5. Select the storage area on the Map View.
  6. The Georeference Storage Areas dialog box will be redisplayed, and the selected storage area will be displayed in the Storage area ID dropdown combo box.
    Storage area ID dropdown combo boxAlternatively, choose the storage area from the dropdown combo box adjacent to the Storage area ID entry.
    Storage area ID dropdown combo box 2Note that if a storage area has been preselected prior to running this command, the selected storage area will be displayed in the Storage area ID dropdown combo box.

Once the storage area has been selected, the user can choose between the following options to georeference the storage area:

  • Snap to Alignment Polyline/Polygon
  • Draw on Map View

Snap to Alignment Polyline/Polygon

If an existing alignment polyline or polygon for the storage area exists on the Map View, the Snap to Alignment Polyline/Polygon can be used to snap the storage area to the alignment polyline/polygon so that the storage area matches that of the alignment polyline/polygon.

Follow the steps below to snap the storage area to the selected alignment polyline or polygon:

  1. Choose the Snap to Alignment Polyline/Polygon radio button option and click the [Pick] button adjacent to the Select alignment polyline/polygon read-only field.
    Select alignment polyline/polygon [Pick] button
  2. The Georeference Storage Areas dialog box will temporarily disappear, and a prompt will be displayed on the status bar instructing the user what to do next.
  3. Select the alignment polyline or polygon on the Map View.
  4. The Georeference Storage Areas dialog box will be redisplayed, and the status of the Select alignment polyline/polygon read-only field will be changed from Not Selected to Selected.
  5. Click the [Snap] button.
    [Snap] button
  6. The software will snap the storage area to the selected alignment polyline or polygon.

Draw on Map View

This option allows the user to draw an alignment polygon on the Map View.

Follow the steps below to draw the storage area on the Map View:

  1. Choose the Draw on Map View radio button option and click the [Draw] button. Optionally, turn on the Create curvilinear polygon checkbox option to draw the polygon using curvilinear segments.
    [Draw] button
  2. The Georeference Storage Areas dialog box will temporarily disappear, and a prompt will be displayed on the status bar instructing the user what to do next.
  3. Draw the polygon on the Map View representing the storage area. While drawing elements, the user can use the [Ctrl] key to switch between the curvilinear and the linear digitizing. Refer to this article in our knowledge base to learn more about drawing elements on the Map View.
  4. When finished, press the [Enter] key or right-click and choose Done from the displayed context menu.
  5. The Georeference Storage Areas dialog box will be redisplayed.
  6. The software will automatically update the storage area accordingly.

About the Author Chris Maeder

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