DTED (Digital Terrain Elevation Data) Writer Parameters

Sets the producer agency code for the generated cells. The first two characters should be the DIA country code followed by additional code information provided by the national defense mapping agency.

The date the data was compiled. This date should be the most descriptive date in YYMM format. 

This parameter may be used to set the absolute vertical accuracy (User Header Label [UHL] record, characters 29 to 33) with 90% assurance that the linear errors will not exceed this value relative to mean sea level. Valid values are integral numbers in the range 0000-9999 with leading zeros. By default, the value NA is used, indicating the vertical accuracy information is not available.

• Yes – Creates subfolder structure with tiles stored in subfolders by longitude, with files named by latitude.
• No (default) –Creates files with no subfolder naming structure.

For example, if the output is specified by data written to the 1 degree square at 80 degrees west, and 43 degrees north, and Dataset is C:\Output\Data:

• No – The output will be a file written to C:\Output\Data\w080n043.dt1.
• Yes – The output will be written to C:\Output\Data\w80\n43.dt1.

This setting defines the security classification code field in the Data Set Identification (DSI) record (character 4).

The default value is Unclassified.

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):