Fixes needed for streams are: HLINE should be removed from the by county data sets.
Any hardcopies utilizing DNR data sets shall clearly indicate their source. If the licensee has modified the data in any way they are obligated to describe the types of modifications they have performed on the hardcopy map. Licensee specifically agrees not to misrepresent DNR data sets, nor to imply that changes they made were approved by DNR.
These data are not to be used for commercial profit.
GIS Processing: INHS Staff Documentation: D. Nelson and S. Beaverson Quality Control: INHS Staff
Attribute items are in feature class format. Those arc attribute items requiring addintional expalnation are:
ENR, Redefined to ENR1 and ENR2
Code composed of one or two parts describing the
type of feature represented. Derived from original
coding in DLG files.
from Standards for Digital Line Graphs, USGS, 1987.
Values for ENR1 include:
200 - shoreline
201 - manmade shoreline
203 - indefinite shoreline
204 - apparent limit, delineates patterned areas on quads
412 - stream
414 - ditch of canal
415 - aqueduct
418 - siphon
419* - boundary of a channel in a waterbody
Values for ENR2 include:
406 - dam
407 - canal lock or sluice gate
409 - gate (flood, tidal, head, check)
605 - right bank
606 - left bank
610 - intermittent
611 - abandoned
These codes are not consistent with USGS coding
but were added by IGIS staff to originally unattributed arcs.
Special cases of minor code values:
202 (closure): This value appears both alone and as a
modifier for streams (412) and ditches (414).
This code is maintained as 202 in ENR2.
ENR codes containing 202 include 000202,
412202 & 414202.
406 (dams): This value appears both alone and as a modifier
to shorelines (200). This code is maintained
as 406 in ENR2. Possible codes include 000406
and 200406.
602 (overpassing)
617 (underpassing): These descriptors are modifiers for a
number of feature types including siphons
(418), streams (412) and ditches (414).
They are carried in item OV-UN. 1 indicates
overpassing and 2 indicates underpassing.
Precedence:
In a few limited cases, information coded in the original
data was discarded due to how the codes were restructured.
These situations are resolved as follows:
intermittent and closure line are coded as closure lines (202)
intermittent and abandoned are coded as intermittent (610)
414 610 202 ditch intermittent closure. Closure supersedes
414 610 611 ditch intermittent abandoned. Interim. supersedes
OV-UN
Overpassing indicates a feature that passes over
rather than intersects another feature, such as
an aqueduct. Note that this is not maintained topologically.
Underpassing indicates a feature passing under another
feature, such as an aqueduct.
from Standards for Digital Line Graphs,
USGS, 1987.
Domain: 0 - Neither
1 - overpassing
2 - underpassing
COINCIDENT
DLG feature code indicating the type of feature in
other DLG data sets with which this arc is coincident.
This attribute was carried over form the original
DLG data set and has not been checked or maintained.
Refer to USGS DLG Users Guide.
from Standards for Digital Line Graphs, USGS, 1987.
Domain: See USGS DLG Users Guide 2.
HLINE
six-digit integer previously used for archival purposes.
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Illinois Natural Resources Geospatial Data Clearinghouse
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