001482L 1 0600049   22040000210000012921DQPA49500000;&1107DQPA.DDF0100;&DDF RECORD IDENTIFER1600;&Positional AccuracyMODN!RCID!COMT(A,I,A)00295 D 1   00041   310400010080DQPA24680000001DQPA1DEM LEVEL  2 means: Data sets have been processed or smoothed for consistency and edited to remove identifiable systematic errors.  An RMSE of half of the contour interval is the maximum permitted, with no errors greater than one contour.00197 D 1   00041   310400010080DQPA14880000002DQPA2ACCURACY: RMSE of the DEM data relative to the file's datum
(x,y,z) is (0, 0, 1); accuracy has been calculated based on a sample
size of 30.00076 D 1   00039   21040001080DQPA2980000003DQPA3CONTOUR INTERVAL:  5.00087 D 1   00039   21040001080DQPA4080000004DQPA4CONTOUR INTERVAL UNITS:  METERS.00087 D 1   00039   21040001080DQPA4080000005DQPA5SUSPECT AREAS: No suspect areas.00297 D 1   00041   310400010080DQPA24880000006DQPA6VERTICAL DATUM SHIFT: -0.050000. Adding this value to
the elevation values will convert it to North American Vertical Datum
1988. Value is computed by averaging the shift values for the four
quadrangle corners obtained from program VERTCON.01219 D 1   00043   4104000100080DQPA116880000007DQPA7SUSPECT AREAS: Suspect areas in the DEM result from corresponding
areas on the graphic source that are shown as disturbed surfaces.
They are symbolized by contours that have been overprinted with
photorevised or other surface patterns. Examples of disturbed surfaces
are: lava flows, land slides, open pit mining, construction cut and
fill, and land fill operations. An estimated elevation is supplied for
suspect areas based on the presumed elevation at the time the DEM grid
is generated; however, the true elevation is subject to change without
notice. When an elevation cannot be estimated for a suspect area, the
area is downgraded to a void area and assigned a false negative value
-32,767. Grid posts falling in suspect areas are added to the DEM grid
as though they were valid elevations; they are distinguishable from
normal DEM grid posts only by an independent inspection of the graphic
source. For this reason, no percentage value for the total number of
cells in the DEM that are assigned an estimated value. Suspect areas
relate only to graphic sources. Furthermore, no commensurate code
exists for suspects areas in the DLG hypsography category.00296 D 1   00041   310400010080DQPA24780000008DQPA8WATER BODIES: Water body areas are naturally occurring
areas of constant elevation.  Oceans or estuaries at mean sea level
are assigned an elevation value of zero.  All other water bodies are
assigned their known or an estimated elevation.00586 D 1   00041   310400010080DQPA53780000009DQPA9HORIZONTAL ACCURACY: The horizontal positions of grid posts
in USGS DEM's are located at precise mathematically defined positions
in UTM meters or arc seconds.  These grid posts are fixed in position
and can be considered constants for the purpose of determining
accuracy.  The only measurable or perceivable errors in the DEM exist
as vertical errors that may be partially attributable to horizontal
error inherent in the source data or to errors in converting
horizontal and vertical components of the source to gridded format.