Esri Geodatabase (File Geodb Raster Catalog) Reader Parameters

Click the browse button to select a File Geodatabase.

After specifying the database connection, click the Browse button (...) to select tables for import. A connection window appears while the system retrieves the tables from the database.

Once the Select Tables dialog appears, you can select one or more tables. Click OK to dismiss the window and add the selected table name(s) to the Tables parameter.

The WHERE clause parameter is used to constrain the row selection in tables chosen in the Tables parameter. FME will select only the rows (records) that match this condition.

The easiest method to construct a WHERE clause is by using the editor. Click the browse button (...) to open the editor, and use the SQL functions to construct the clause.

You can also type a WHERE clause directly in the parameter field:

If the WHERE clause SQL is invalid, the translation will fail.

Tip  For assistance with constructing WHERE clauses, click the AI Assist button in the WHERE Clause editor.

Use this parameter to expose Format Attributes in FME Workbench when you create a workspace:

• In a dynamic scenario, it means these attributes can be passed to the output dataset at runtime.
• In a non-dynamic scenario, this parameter allows you to expose additional attributes on multiple feature types. Click the browse button to view the available format attributes (which are different for each format) for the reader.

This parameter controls how Geodatabase aliases are used.

• None – Aliases are ignored.
• Replace Attribute Names with Aliases – (only applicable when adding a reader) Attributes on feature types will be named for their aliases rather than their official names. A geodb_feature_class_alias attribute will be included on each feature. Use this mode when the target format should create feature types using the aliases as attribute names.
• Expose Aliases as Metadata Attributes – For each attribute read, a second <name>_alias attribute will be added that stores the alias for the attribute in question. A geodb_feature_class_alias attribute will also be included on each feature. Use this mode when the target format is Geodatabase and the aliases should be preserved during feature class and table creation.

Coordinate systems may be extracted from input feature data sources, may come predefined with FME, or may be user-defined. FME allows different output and input coordinate systems, and performs the required coordinate conversions when necessary.

For systems that know their coordinate system, the Coordinate System field will display Read from Source and FME will read the coordinate system from the source dataset. For most other input sources, the field will display Unknown (which simply means that FME will use default values). In most cases, the default value is all you'll need to perform the translation.

You can always choose to override the defaults and choose a new coordinate system. Select More Coordinate Systems from the drop-down menu to open the Coordinate System Gallery.

Changing a Reprojection

To perform a reprojection, FME typically uses the CS-MAP reprojection engine, which includes definitions for thousands of coordinate systems, with a large variety of projections, datums, ellipsoids, and units. However, GIS applications have slightly different algorithms for reprojecting data between different coordinate systems. To ensure that the data FME writes matches exactly to your existing data, you can use the reprojection engine from a different application.

To change the reprojection engine, Select Workspace Parameters > Spatial > Reprojection Engine. In the example shown, you can select Esri (but the selection here depends on your installed applications):

A search envelope (also known as a bounding box) is a rectangular area that defines a geographic area. In FME, the easiest way to define a search envelope is to use search envelope parameters.

Defining a search envelope is the most efficient method of selecting an area of interest because FME will read only the data that is necessary – it does not have to read an entire dataset. Search Envelope parameters apply to both vector and raster datasets and can be particularly efficient if the source format has a spatial index.

Most FME readers have parameters to define the search envelope of data that is being read:

The parameters include the x and y coordinates of the bounding box as well as a parameter that defines the coordinate system.

How to Define the Bounding Box

Using the minimum and maximum x and y parameters, define a bounding box that will be used to filter the input features. Only features that intersect with the bounding box are returned. Note that the bounding box intersection is not a full geometry intersection (based on spatial relationships) that would be returned by a transformer like the SpatialFilter.

Managed rasters, rasters stored within the Geodatabase, represent Nodata as a bit mask on each band. This parameter specifies how to handle these Nodata bit masks.

• None – Nodata bit masks will be ignored
• Single Alpha Band (default) – Nodata bit masks for each band are merged into a single additional alpha band named geodb_nodata.

If merged into a single alpha band, then the alpha band will contain a value of 0 (Nodata) at a given cell if and only if the corresponding cell of all the other bands is Nodata.

This parameter only affects managed rasters. Unmanaged rasters, rasters stored in files outside the Geodatabase, have Nodata represented as a Nodata value per band and do not have Nodata bitmasks.