Illinois Department of Natural Resources 1994 20040401 vector digital data ISGS GIS Database GISDB_HYDRO.IL_Streams_From_100K_DLG_Ln Champaign, Illinois Illinois State Geological Survey This dataset contains data representing streams and shorelines in Illinois and portions of surrounding states as derived from US Geological Survey 1:100,000-scale Digital Line Graph files, hydrography layer, 1980-1986. This includes all the DLG streams data that ISGS/IDNR customarily stored by county prior to 2004. Polygon topology is not included (i.e. Lakes can not be identified or shaded). Many class 1 streams are not included. Edgematching and generation of polygon topology for lakes and large rivers is incomplete. Publication dates of the USGS maps used as sources range from 1980 to 1986. The maximum estimated error in horizontal position based on National Map Accuracy Standards is 167 feet. Experience shows that actual locational error appears to be greater, especially in localized areas. Attributes include feature type and coincidence, among others. The data are stored in geographic coordinates, NAD83. These data have not been updated since 1986 (except in one isolated instance), nor are there plans to do so. Accordingly, these data are for general reference and cartographic use. This is a legacy dataset made available as a convenience. The data are not suitable for showing all local streams or shorelines at a large scale for any given area. These data can be considered to be essentially out of date and unmaintained. These data and most of the accompanying metadata were originally developed and maintained under the auspices of the Illinois Geographic Information System (IGIS) initiative (circa 1986). Maintenance of the metadata was transferred to ISGS circa 1996. These data are primarily intended as a cartographic element on maps for spatial reference. This dataset serves as an important base cartographic element for many types of maps and has been widely distributed and used outside the ISGS. The data set was not and is not intended as a substitute for surveyed locations, such as can be determined by a registered Public Land Surveyor. Although useful in a GIS as a reference base layer for maps, the data set has no legal basis in the definition of boundaries or property lines. Edition 1.0 of this dataset was updated by conversion to the ArcSDE data storage model, metadata update, and appending coverage data for the 102 counties in Illinois into a single feature class. 1980 1986 publication dates of source data Complete None planned -91.511860 -87.495830 42.500016 37.000043 none stream river creek shoreline hydrology hydrography lake water none Illinois none 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 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. Please refer to distribution information. ArcSDE 8.2 on Oracle 9i No report. Consult source DLG information. 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. Dataset is incomplete. 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. Accuracy of 1:100,000 analog map based on USGS National Map Accuracy Standards. Bureau of the Census, US Department of Commerce Unknown 100000 digital file 1980 1986 publication date none hydrographic data Refer to abstract. Unknown Data corrected for Pike and Scott counties. Eleven stream arcs occurred in the northeast corner of the Pike county streams coverage that should actually be in the Scott county streams coverage. It is assumed that this was caused by clipping the original statewide streams coverage with an incorrect county boundary. The fix was performed in ArcEdit 7x by selecting the arcs in the Pike coverage and PUTting them into the Scott coverage. 20021022 The 102 county-by-county coverages stored as <county_name>/streams were appended using Arc/Info 7.2.1 on a UNIX workstation. The process was automated with an AML program. The command was: Arc: append streams line features (the 102 coverages were listed here) end The new coverage was reprojected from customary ISGS Lambert projection, NAD27 to geographic coordinates, NAD83, double-precision. That coverage was imported into ISGS SDE enterprise database, following steps outlined in ISGS procedure GISDB_0009. Spatial index grid size was set at 0.125 degrees. Metadata was updated. 20040401 Vector String 85712 0.000001 0.000001 Decimal degrees North American Datum of 1983 Geodetic Reference System 80 6378137.000000 298.257222 IL_Streams_From_100K_DLG_Ln FID Internal feature number. ESRI Sequential unique whole numbers that are automatically generated. Shape Feature geometry. ESRI Coordinates defining the features. HLINE ENR OV_UN COINCIDENT USGS ENR1 ENR2 Attribute items are in typical ArcSDE feature class format. Those requiring additional explanations are: ENR1, ENR2, ENR ENR1 and ENR2 are concatenated to create ENR 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. none Illinois State Geological Survey, Geospatial Analysis and Modeling Section mailing and physical address

615 East Peabody Drive

Champaign Illinois 61821 USA 217-333-4747 217-785-0211 isgs@isgs.uiuc.edu 8:00 a.m. - 4:30 p.m., Monday - Friday, U.S. Central Time 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. The data are intended for use with GIS software. The ISGS uses ESRI ArcGIS software, however, the ESRI shapefile format can be imported into many different GIS software packages. It is expected that customers who order this data have the technical expertise to use GIS software. The ISGS does not provide software support of any kind. 19980731 Please refer to the distribution information. FGDC Content Standards for Digital Geospatial Metadata FGDC-STD-001-1998 local time None. None. http://www.esri.com/metadata/esriprof80.html ESRI Metadata Profile