In addition to the generic FME feature attributes that FME Workbench adds to all features (see About Feature Attributes), this format adds the format-specific attributes described in this section.
CDED raster features are specified by a matrix of x, y, and z coordinates. If known, the coordinate system will be specified.
All CDED features contain a cded_type attribute, which identifies the geometric type.
|
Attribute Name |
Contents |
|
cded_type |
The CDED geometric type of this entity. This is always cded_raster. |
|
cded_file_name |
This is a string that specifies the basename of the raster file. |
|
cded_producer |
This is a string that specifies the producer of the data. |
|
cded_process_code |
This is a one-byte integer that specifies how to the data is processed. Range: 1...8 Default: 8 |
|
cded_origin_code |
This is a 4-character string that specifies the mapping origin. |
|
cded_level_code |
This is an integer defining the DEM level. This field is always set to 1 for 1:50,000 and 1:250,000 CDED. Range: 1-3 Default: 1 |
|
cded_code_defining_elevation_pattern |
This is an integer specifying the regularity of the elevation pattern. Range: regular|random Default: regular |
|
cded_spatial_ |
A positive real number used to specify a scale to apply to the elevation values in the z dimension. In USGS DEM data, this is stored as spatial_resolution_z. When specified for the writer, elevation values will be scaled appropriately. This value is tied to the value of cded_units; resolutions of 1 decimal place for feet and 2 decimal places for meters are permitted. Default: 1 |
|
cded_accuracy_code_for_elevations |
A number that specifies the existence of accuracy information for this dataset. 0 indicates unknown accuracy information. Range: 0|1 Default: 0 |
|
cded_units |
The unit of measure for the z coordinate (the altitude). Range: meters|feet Default: No default |
|
cded_suspect_and_void_area_flag |
This is a one-digit integer that indicates if the data contains void areas. Only valid for CDED-1. Range: 0|2 Default: Calculated based on percent void |
|
cded_data_edition |
This is a four-digit integer specifying the data edition or version used. The first two digits indicate the data edition while the last two digits indicate the specifications version. Only valid for CDED-1. Range: 0...9999 Default: 1021 |
|
cded_percent_void |
This is an integer equal to the percentage of nodes in the file set to void (-32767). This is only populated if the cded_data_edition field indicates a void. Only valid for CDED-1. Range: 0...100 Default: Calculated based on number of void nodes |