Fixes needed for streams are: HLINE should be removed from the by county data sets.
Illinois Department of Natural Resources, 1994, Streams and Shorelines in Illinois by County: IDNR GIS Database streams.Online Links:
- Gain Access to Illinois Datasets by County. <URL:http://www.isgs.uiuc.edu/nsdihome/webdocs/county.html>
- Text (.txt) version of this Metadata file. (Shift-Click to download documentation) <URL:http://www.isgs.uiuc.edu/nsdihome/outmeta/streams.txt>
- HTML (.html) version of this Metadata file. (Shift-Click to download documentation) <URL:http://www.isgs.uiuc.edu/nsdihome/outmeta/streams.html>
This is a Vector data set.
The map projection used is Lambert Conformal Conic.
Planar coordinates are encoded using coordinate pair
Abscissae (x-coordinates) are specified to the nearest unknown
Ordinates (y-coordinates) are specified to the nearest unknown
Planar coordinates are specified in feet
The horizontal datum used is NAD27.
The ellipsoid used is CLARKE1866.
The semi-major axis of the ellipsoid used is 6378206.4 meters.
The flattening of the ellipsoid used is 1/294.98.
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.
GIS Processing: INHS Staff Documentation: D. Nelson and S. Beaverson Quality Control: INHS Staff
217-333-4747 (voice)
217-244-0802 (FAX)
isgs@isgs.uiuc.edu
These data are appropriate for use in local and regional thematic analysis using streams or shorelines. Data are not appropriate as a geodetic or engineering base.
Bureau of the Census, US Department of Commerce, unknown, TIGER/Line Files, hydrography layer, 1980-86.
None. Consult source DLG information.
Accuracy of 1:100,000 analog map based on USGS National Map Accuracy Standards.
No statement of completeness was provided with the original USGS DLG data. Visual inspection and comparison with other larger scale sources suggests that many first and second order streams are not included. The level of detail (completeness) varies across quad (module) boundaries due to the variation in the original DLG data.
Data set is topologically structured linear data however data have not been thoroughly edgematched and are not a topologically complete representation of the hydrologic network. Pseudo nodes and discontinuities exist on many arcs.
Are there legal restrictions on access or use of the data?
- Access_Constraints: none
- Use_Constraints:
- Reproduction or redistribution of copyrighted digital data sets or products derived therefrom outside of licensee's organization or entity is expressly forbidden. The only exception is redistribution to consultants working for the licensee, and then only for purposes, related to work for the licensee. Such consultants may not further reproduce or redistribute these data sets. None of these data shall be electronically duplicated on magnetic or optical media for use by others, in whole or in part, without permission of the appropriate custodial division within DNR.
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.
217-333-4747 (voice)
217-244-0802 (FAX)
isgs@isgs.uiuc.edu
An Arc/Info .e00 (export) file is currently available free of charge at the Illinois Natural Resources Geospatial Data Clearinghouse. Refer to the Citation Information portion of this file for access to downloadable data and metadata. Shift-click to download the data set and related documentation. (Data and metadata offered separately via the Illinois Datasets by County browse area, please download both files.)
The Illinois Department of Natural Resources (DNR) provides these geographic data "as is." DNR makes no guarantee or warranty concerning the accuracy of information contained in the geographic data. DNR further makes no warranties, either expressed or implied as to any other matter whatsoever, including, without limitation, the condition of the product, or its fitness for any particular purpose. The burden for determining fitness for use lies entirely with the user. Although these data have been processed successfully on computers of DNR, no warranty, expressed or implied, is made by DNR regarding the use of these data on any other system, nor does the fact of distribution constitute or imply any such warranty.In no event shall the DNR have any liability whatsoever for payment of any consequential, incidental, indirect, special, or tort damages of any kind, including, but not limited to, any loss of profits arising out of use of or reliance on the geographic data or arising out of the delivery, installation, operation, or support by DNR.
217-333-4747 (voice)
217-244-0802 (FAX)
isgs@isgs.uiuc.edu
Illinois Natural Resources Geospatial Data Clearinghouse
Generated by mp version 2.8.11 on Mon Jan 29 15:19:44 2007