Rasters

dem_type: dem_raster

USGS DEM raster features specify a matrix of x, y, and z coordinates. If known, the coordinate system will be specified.

Attribute Name	Contents
dem_file_name	This is a string that specifies the basename of the raster file.
dem_producer	This is a string that specifies the producer of the data.
dem_process_code	This is a one-byte integer that specifies how to the data is processed. Range: 1...8 Default: 8
dem_sectional_indicator	Unique to 30-minute DEMs, this 3-character string identifies 1:100,000-scale sections.
dem_origin_code	This is a 4-character string that specifies the mapping origin.
dem_level_code	This is an integer defining the DEM level. FME will not determine or check the validity of this assertion. Level 1: 7.5-minute or 30-minute DEM created by autocorrelaton or manual profiling from aerial photographs. Level 2: DEM created from digital line graph contours or equivalent, from any USGS map series up to 1:100,000 scale. Level 3: 7.5-minute DEM created from a digital line graph that has vertically integrated with all categores of hypsography, hydrography, ridge line, break line, drain files, and all vertical and horizontal control networks. Level 4: DEM created from electronic imaging sensor systems. Range: 1-4 Default: 1
dem_code_defining_elevation_pattern	This specifies the regularity of the elevation pattern. Range: regular\|random Default: regular
dem_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: 1
dem_spatial_ resolution_z	A positive real number used to specify a scale to apply to the elevation values in the z dimension. When specified for the writer, elevation values will be scaled appropriately. This value is tied with the value of dem_units; resolutions of 1 decimal place for feet and 2 decimals places for meters are permitted. Default: 1
dem_units	The unit of measure for the z coordinate (the altitude). Range: meters\|feet Default: No default
dem_largest_primary_ contour_interval	Unique to level 2 DEMs, this integer specifies the largest primary contour interval if two or more primary intervals exist. If this field is not provided to the writer, it will be left blank.
dem_largest_primary_ contour_interval_units	Unique to level 2 DEMs, this corresponds to the units of the largest primary contour interval. If this field is not provided to the writer, it will be left blank. Range: N.A.\|meters\|feet
dem_smallest_primary_ contour_interval	Unique to level 2 DEMs, this integer specifies the smallest or only primary contour interval. If this field is not provided to the writer, it will be left blank.
dem_smallest_primary_ contour_interval_units	Unique to level 2 DEMs, this corresponds to the units of the smallest primary contour interval. If this field is not provided to the writer, it will be left blank. Range: N.A.\|meters\|feet
dem_data_source_date	This specifies the year that the original compilation data was formed. If this field is not provided to the writer, it will be left blank.
dem_data_inspection_and_revision_date	This specifies the year of the date of completion or revision. If this field is not provided to the writer, the current year will be used.
dem_inspection_flag	This flag is blank if quality control has not been performed. Otherwise, it is flagged as “I” to indicate that all quality control processes are complete. If this field is not provided to the writer, it will be left blank.
dem_data_validation_flag	This single-digit integer specifies the type of data validation performed. Range: 0-5 Default: 0
dem_suspect_and_void_ area_flag	This is a one-digit integer that indicates if the data contains void areas. If this field is not provided to the writer, it will be left blank. Range: 0-3
dem_data_edition	This is a four-digit integer specifying the data edition or version used. Range: 0...9999 Default: 1
dem_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 dem_data_edition field indicates a void. If this field is not provided to the writer, it will be left blank. Range: 0...100
dem_edge_match_flag_WEST	This integer flag specifies if edge-matching is required on the western edge of the raster. If this field is not provided to the writer, it will be left blank. Range: 1-4
dem_edge_match_flag_ NORTH	This integer flag specifies if edge-matching is required on the northern edge of the raster. If this field is not provided to the writer, it will be left blank. Range: 1-4
dem_edge_match_flag_EAST	This integer flag specifies if edge-matching is required on the eastern edge of the raster. If this field is not provided to the writer, it will be left blank. Range: 1-4
dem_edge_match_flag_ SOUTH	This integer flag specifies if edge-matching is required on the southern edge of the raster. If this field is not provided to the writer, it will be left blank. Range: 1-4
dem_vertical_datum_shift	This number specifies the value to add to convert to NAVD88. If this field is not provided to the writer, it will be left blank.
file_datum_stats_avail	The code indicating the availability of the statistics in attributes ‘file_datum_rmse_[x\|y\|z]’. 0 = unavailable, 1 = available Range: 0\|1 Default: No default
file_datum_rmse_x	RMSE of file’s datum relative to absolute datum (for the x-coordinate). Range: 0...999999 Default: No default
file_datum_rmse_y	RMSE of file’s datum relative to absolute datum (for the y-coordinate). Range: 0...999999 Default: No default
file_datum_rmse_z	RMSE of file’s datum relative to absolute datum (for the z-coordinate). Range: 0...999999 Default: No default
file_datum_sample_size	Sample size on which statistics for attributes ‘file_datum_rmse_[x\|y\|z]’ are based. Range: 0...999999 Default: No default
dem_datum_stats_avail	The code indicating the availability of the statistics in attributes ‘dem_datum_rmse_[x\|y\|z]’. 0 = unavailable, 1 = available Range: 0\|1 Default: No default
dem_datum_rmse_x	RMSE of DEM datum relative to file’s datum (for the x-coordinate). Range: 0...999999 Default: No default
dem_datum_rmse_y	RMSE of DEM datum relative to file’s datum (for the y-coordinate). Range: 0...999999 Default: No default
dem_datum_rmse_z	RMSE of DEM datum relative to file’s datum (for the z-coordinate). Range: 0...999999 Default: No default
dem_datum_sample_size	Sample size on which statistics for attributes ‘dem_datum_rmse_[x\|y\|z]’ are based. Range: 0...999999 Default: No default