Identification_Information: Citation: Citation_Information: Title: USGS Quadrangle Boundaries and Corner Points in Illinois in NAD83 Series_Information: Series_Name: ISGS GIS Database Issue_Identification: GISDB.IL_QUAD_Usgs_Quadrangle_Index_Nad83 Publication_Information: Publication_Place: Champaign, Illinois Publisher: Illinois State Geological Survey Publication_Date: 199803 Edition: 2.0 Geospatial_Data_Presentation_Form: vector digital data Originator: Illinois State Geological Survey Description: Abstract: This feature dataset contains point, line and polygon data that describe ideal USGS quadrangle boundaries and corner points for quadrangles that intersect the state of Illinois. The attribute data include quadrangle name and index number, longitude and latitude values for quadrangle boundaries, X and Y coordinate values in decimal degrees for quadrangle corners, and boolean indicators of which lines to use to construct index maps for common map series (by scale or extent). This feature dataset includes line and polygon feature classes for each of the following scales/extents: 3.75-minute x 3.75-minute, commonly called quarter-quadrangles, typically used for a 1:12,000-scale index, 7.5-minute x 7.5-minute, the common USGS topographic sheet extent, typically 1:24,000-scale in Illinois, 15-minute x 15-minute, typically used for 1:62,500-scale index, 30-minute x 1 degree, typically used for 1:100,000-scale index, 1-degree x 2-degree, typically used for 1:250,000-scale index. Also included are master line, polygon, and corner point (tic) templates from which the above were generated. These are entitled Base_Template_Ln, Base_Template_Py and Corner_Tic_Pt respectively, and include of all the 3.75-minute x 3.75-minute quarter-quadrangles and corners from 36 to 43 degrees north latitude and 86 to 92 west longitude, with an indication of which are within Illinois. Each boundary line is composed of segments that are 18 arc-seconds in length. To provide some reference, there are 25 such segments in a line 7.5 minutes long. These vertices are included so that on reprojection of the data into a different coordinate system the quadrangle boundaries will "curve" to maintain a realistic representation of quadrangle shape in relation to real world coordinates. The data were generated as a mathematical construct, independent of ground condition. That is, they were generated from a digital file of decimal degree-minute-second locations for each quadrangle corner, using the ArcInfo Workstation GENERATE command. Tics were generated in this manner as well, one at each quarter-quad corner. Thus quadrangle corners are exact within ideal geographic decimal degree NAD83 coordinate space. Some non-ideal quadrangle boundaries have been added to the dataset to account for quadrangle maps with irregular boundaries, for example 15-minute quadrangles in the Chicago area. The nominal scale is as stated above for each feature class. However, these data are in fact scale-less because they are a mathematical construct independent of ground condition. The spatial reference is the Geographic Coordinate System, decimal degrees, NAD83. Purpose: These data are most useful as indices and reference grids of quadrangle-based data, such as DOQs, DRGs and topographic map sheets. They have many applications in data cataloging and searching applications. These data also provide exact quadrangle corners in NAD83, which are useful for the registration of multiple quadrangle-based data layers. These data are appropriate for use in local and regional thematic analysis. The data are not appropriate as a geodetic, legal or engineering base. 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. Supplemental_Information: In July, 2003 the data set was transitioned to storage in an Oracle RDBMS using the ArcSDE geodatabase model. The result (and most current edition) is designated Edition 2.0. Recent updates to data: In August, 2002 the name of the Eaton 7.5-minute quadrangle was updated to Porterville, to reflect an official name change by the Geographic Names Information System (GNIS). Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 20030708 Currentness_Reference: n/a - These data are a mathematical construct independent of ground condition Status: Progress: Complete Maintenance_and_Update_Frequency: None planned Spatial_Domain: Bounding_Coordinates: West_Bounding_Coordinate: -92.000000 East_Bounding_Coordinate: -86.000000 North_Bounding_Coordinate: 43.000000 South_Bounding_Coordinate: 36.000000 Keywords: Theme: Theme_Keyword_Thesaurus: none Theme_Keyword: quadrangle Theme_Keyword: boundary Theme_Keyword: index Theme_Keyword: corner point Place: Place_Keyword_Thesaurus: none Place_Keyword: Illinois 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 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. Point_of_Contact: Contact_Information: Contact_Organization_Primary: Contact_Instructions: Please refer to the distribution information section. Data_Set_Credit: GIS Processing: ISGS staff and other staff of the Illinois Scientific Surveys. Documentation: ISGS and INHS staff Quality Control: INHS and ISGS staff Native_Data_Set_Environment: ArcSDE 9.1 on Oracle 10g, ArcGIS 9.1 on Windows XP Cross_Reference: Citation_Information: Title: USGS Quadrangle Boundaries and Corner Points in Illinois in NAD27 Originator: Illinois State Geological Survey Publication_Date: 199803 Geospatial_Data_Presentation_Form: vector digital data Series_Information: Series_Name: ISGS GIS Database Issue_Identification: GISDB.IL_QUAD_Usgs_Quadrangle_Index_Nad27 Publication_Information: Publication_Place: Champaign, Illinois, USA Publisher: Illinois State Geological Survey Other_Citation_Details: This feature dataset is identical to GISDB.IL_Usgs_Quadrangle_Index_Nad83, except the data are cast on the NAD27 datum. Larger_Work_Citation: Citation_Information: Series_Information: Publication_Information: Edition: 2.0 Data_Quality_Information: Attribute_Accuracy: Attribute_Accuracy_Report: No formal review has been completed. Regular use of these data, however, indicate attributes are accurate. Logical_Consistency_Report: A logical consistency review was performed in March, 1998. At that time the data were maintained in ArcInfo coverage format. The following checks were made: The data set was DESCRIBED and coverage files listed to determine the feature types present. In this data set, the following feature types were found and checked: polygons, arcs, labels, nodes, and annotation. The presence of spatial indices was also checked. For PAT and AAT files, each item was checked for the following: domain of allowable values, adherence of values to the domain, definition of attribute items, requirement of all unique values for an item, logic of items redefined over other items, and length of item name as regards conversion to shapefile format. The topology status of the data set was checked, as were LABELERRORS, NODEERRORS (if appropriate), and the PROJECTION definition. The presence of a BND file was verified. The presence and location of TICS were checked. Polygon and chain-node topology were present. There were no dangling arcs. There was one polygon label per polygon, except for the universe polygon. Boundary values were appropriate for the map projection and map units. COVER-ID values were recalculated to be unique. See the process step for March, 1998. There are two additional arcs in the Chicago region form the eastern boundaries of two irregularly shaped 15' quadrangles. These have values of 999 and 0.999 in the INT_COORD and DEC_COORD fields respectively. There are no known attribute values outside the appropriate domains. Completeness_Report: This dataset includes all of the 3.75-minute x 3.75-minute quarter-quadrangle boundaries and areas from 36 to 43 degrees north latitude and 87 to 92 west longitude, with an indication of which intersect Illinois. This includes quadrangle corner coordinates. Line and polygon feature classes for each of the following scales/extents can, and have been, constructed: 3.75-minute x 3.75-minute, commonly called quarter-quadrangles, typically used for a 1:12,000-scale index 7.5-minute x 7.5-minute, the common USGS topographic sheet extent, typically 1:24,000-scale in Illinois 15-minute x 15-minute, typically used for 1:62,500-scale index 30-minute x 1 degree, typically used for 1:100,000-scale index 1-degree x 2-degree, typically used for 1:250,000-scale index There are two additional arcs in the Chicago region form the eastern boundaries of two irregularly shaped 15' quadrangles. These have values of 999 and 0.999 in the INT_COORD and DEC_COORD fields respectively. Positional_Accuracy: Horizontal_Positional_Accuracy: Horizontal_Positional_Accuracy_Report: These data are a mathematical construct and as such should have a high degree of positional accuracy (i.e. exact, with the exception of arcs added for irregular 15-minute quadrangle boundaries). No review has been completed, however. There have been several instances where map indices generated from these boundaries have been used with other data digitized from USGS quadrangles with good results. Lineage: Process_Step: Process_Contact: Contact_Information: Contact_Person_Primary: Process_Description: Boundaries were generated by version 7.1.1 of the Arc/Info software from a file of decimal degree minute second locations for each quadrangle corner (7.5-minute x 7.5-minute), using the GENERATE command. Tics were generated as well, one at each quad corner. The AML that was used is reproduced below. Latitude and longitude values were assigned to the arcs in the generation process, and the lines were DENSIFIED to have one vertex every 18 arc-seconds (25 vertices per 7.5 arc-minutes). The result was a parent coverage called QUADTILE. Two arcs for irregularly shaped 15' quadrangles in the Chicago area were added. The spatial reference was defined as Geographic, decimal degrees, NAD27, and then reprojected to the customary ISGS Lambert Conformal Conic projection. One label was added to each polygon. Internal logical consistency checks were made as described in the logical consistency report. This data set was used to generate updated arcs and tics for coverages QUAD75, QUAD15, QUAD100, and QUAD250. Lines in the line feature classes were UNSPLIT based on the coordinate values to create a single, complete line segment for each side of a quadrangle. Lines and polygons intersecting the state of Illinois were determined using a spatial join with the state boundary polygon in ArcView 3.2. Other attribute data were transferred using spatial joins between legacy coverage label points and newly generated coverage polygons. The source legacy coverages are from the 1996 Illinois GIS CD-ROM compilation. The source legacy coverages date back to the mid-1980s and were originally developed as a part of a project known as the Illinois Geographic Information System (IGIS). AML to generate tics and lines: &mess &off &sv ticid = 0 &sv arcid = 0 &sv inc = 625 &sv minlat = 360000 &sv maxlat = 430000 &sv minlon = 870000 &sv maxlon = 920000 &mess &on &type Calculating coordinates for arcs and tics... &mess &off &sv open1 = [open tics.txt opens -write] &sv open2 = [open arcs.txt opens -write] &do lat = %minlat% &to %maxlat% &by %inc% &do lon = %minlon% &to %maxlon% &by %inc% &sv lat1 = %lat% / 10000 &sv lon1 = %lon% / -10000 &sv lat2 = ( %lat% + %inc% ) / 10000 &sv lon2 = ( %lon% + %inc% ) / -10000 &sv ticid = %ticid% + 1 &sv writeline %ticid%,%lon1%,%lat1% &sv wrote [write %open1% %writeline%] /*&sv arcid = %arcid% + 1 &sv arcid = %lon% &sv wrote [write %open2% %arcid%] &sv writeline %lon1%,%lat1% &sv wrote [write %open2% %writeline%] &sv writeline %lon1%,%lat2% &if ^ %lat% = %maxlat% &then &sv wrote [write %open2% %writeline%] &sv writeline end &sv wrote [write %open2% %writeline%] /*&sv arcid = %arcid% + 1 &sv arcid = %lat% &sv wrote [write %open2% %arcid%] &sv writeline %lon1%,%lat1% &sv wrote [write %open2% %writeline%] &sv writeline %lon2%,%lat1% &if ^ %lon% = %maxlon% &then &sv wrote [write %open2% %writeline%] &sv writeline end &sv wrote [write %open2% %writeline%] &type %ticid% &end &end &sv writeline end &sv wrote [write %open1% %writeline%] &sv wrote [write %open2% %writeline%] &sv closed [close -all] &mess &on &ret ------------- After generating the coordinate files with this AML, arc and tic coverages were manually generated with the GENERATE command and then manually combined in ArcEdit 7x. Process_Date: 199803 Process_Step: Process_Description: The coverages were recreated as previously described with the exception that the minimum resolution was changed to the quarter-quadrangle scale (3.75-minute x 3.75-minute), and the data were defined to have a projection of Geographic, decimal degrees, NAD83 and were not further reprojected. The data were then imported into an SDE feature dataset. At this point the edition number was updated to 2.0 to reflect the significant change in data storage model. Process_Contact: Contact_Information: Contact_Person_Primary: Process_Date: 2002 Process_Step: Process_Contact: Contact_Information: Contact_Person_Primary: Process_Description: The data were transferred to the ISGS SDE production server and the metadata updated. Process_Date: 200307 Process_Step: Process_Contact: Contact_Information: Contact_Person_Primary: Process_Description: Updated the 24K_Index_Py, Base_Template_Py and 24K_Index_An feature classes to reflect the change of the name of the Eaton 7.5-minute quadrangle to Porterville. This was in accordance with an official GNIS change. (This change was made to the source coverage in 200208 after it had been imported to the SDE development server for testing.) [begin excerpt from GNIS statement] In the case of the Porterville issue, this geographic feature (the place) was named Eaton. The name Eaton came from the establishment of the original Post Office there and it's Postmaster John Eaton in 1852. The indication of the post office Eaton is shown on the USGS map with a parenthetical under the name Porterville, though the Post Office no longer exists. This name case is a BGN OSN - Board on Geographic Names Official Standard Name, which means it was visited by the BGN Staff but was approved by an Administrative Authority; it did not go to a full board vote. The place was originally platted as East Berlin, but there was little growth until 1850 when Richard Porter established a Blacksmith Shop there. Porterville is the more widely accepted name for the community, though it is also known as Eaton. So this change mandated the change to the USGS quad, after it was brought forward as a possible controversy by our Mapping Center (Rolla) during a project in IL dated 07/01/83. [end excerpt] Source_Used_Citation_Abbreviation: GNIS Process_Date: 20030710 Spatial_Data_Organization_Information: Direct_Spatial_Reference_Method: Vector Point_and_Vector_Object_Information: SDTS_Terms_Description: SDTS_Point_and_Vector_Object_Type: G-polygon Point_and_Vector_Object_Count: 51 SDTS_Terms_Description: SDTS_Point_and_Vector_Object_Type: String Point_and_Vector_Object_Count: 120 SDTS_Terms_Description: SDTS_Point_and_Vector_Object_Type: G-polygon Point_and_Vector_Object_Count: 51 SDTS_Terms_Description: SDTS_Point_and_Vector_Object_Type: String Point_and_Vector_Object_Count: 8754 SDTS_Terms_Description: SDTS_Point_and_Vector_Object_Type: G-polygon Point_and_Vector_Object_Count: 4288 SDTS_Terms_Description: SDTS_Point_and_Vector_Object_Type: G-polygon Point_and_Vector_Object_Count: 291 SDTS_Terms_Description: SDTS_Point_and_Vector_Object_Type: String Point_and_Vector_Object_Count: 632 SDTS_Terms_Description: SDTS_Point_and_Vector_Object_Type: G-polygon Point_and_Vector_Object_Count: 291 SDTS_Terms_Description: SDTS_Point_and_Vector_Object_Type: G-polygon Point_and_Vector_Object_Count: 1072 SDTS_Terms_Description: SDTS_Point_and_Vector_Object_Type: String Point_and_Vector_Object_Count: 2233 SDTS_Terms_Description: SDTS_Point_and_Vector_Object_Type: G-polygon Point_and_Vector_Object_Count: 1072 SDTS_Terms_Description: SDTS_Point_and_Vector_Object_Type: G-polygon Point_and_Vector_Object_Count: 19 SDTS_Terms_Description: SDTS_Point_and_Vector_Object_Type: String Point_and_Vector_Object_Count: 48 SDTS_Terms_Description: SDTS_Point_and_Vector_Object_Type: G-polygon Point_and_Vector_Object_Count: 19 SDTS_Terms_Description: SDTS_Point_and_Vector_Object_Type: Entity point Point_and_Vector_Object_Count: 10961 SDTS_Terms_Description: SDTS_Point_and_Vector_Object_Type: String Point_and_Vector_Object_Count: 21722 SDTS_Terms_Description: SDTS_Point_and_Vector_Object_Type: G-polygon Point_and_Vector_Object_Count: 10756 Spatial_Reference_Information: Horizontal_Coordinate_System_Definition: Geodetic_Model: Horizontal_Datum_Name: North American Datum of 1983 Ellipsoid_Name: Geodetic Reference System 80 Semi-major_Axis: 6378137.000000 Denominator_of_Flattening_Ratio: 298.257222 Geographic: Geographic_Coordinate_Units: Decimal degrees Latitude_Resolution: 0.005 Longitude_Resolution: 0.005 Vertical_Coordinate_System_Definition: Altitude_System_Definition: Distribution_Information: Distributor: Contact_Information: Contact_Organization_Primary: Contact_Organization: Geospatial Analysis and Modeling Section, Illinois State Geological Survey Contact_Address: Address_Type: mailing and physical address Address: 615 East Peabody Drive City: Champaign State_or_Province: Illinois Postal_Code: 61820 Country: USA Contact_Voice_Telephone: 217-333-4747 Contact_TDD/TTY_Telephone: 217-785-0211 Contact_Electronic_Mail_Address: isgs@isgs.uiuc.edu Hours_of_Service: 8:00 a.m. - 4:30 p.m., Monday-Friday, U.S. Central Time Distribution_Liability: 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. Technical_Prerequisites: 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. Metadata_Reference_Information: Metadata_Contact: Contact_Information: Contact_Instructions: Please refer to the distribution information section. Metadata_Standard_Name: FGDC Content Standards for Digital Geospatial Metadata Metadata_Standard_Version: FGDC-STD-001-1998 Metadata_Access_Constraints: None. Metadata_Use_Constraints: This metadata document is to be distributed only by the Illinois State Geological Survey. Metadata_Time_Convention: local time Metadata_Date: 20060426 Metadata_Extensions: Online_Linkage: http://www.esri.com/metadata/esriprof80.html Profile_Name: ESRI Metadata Profile Entity_and_Attribute_Information: Detailed_Description: Entity_Type: Entity_Type_Label: GISDB.IL_QUAD_100K_Index_An_Nad83 Detailed_Description: Entity_Type: Entity_Type_Label: GISDB.IL_QUAD_100K_Index_Ln_Nad83 Detailed_Description: Entity_Type: Entity_Type_Label: GISDB.IL_QUAD_100K_Index_Py_Nad83 Detailed_Description: Entity_Type: Entity_Type_Label: GISDB.IL_QUAD_12K_Index_Ln_Nad83 Detailed_Description: Entity_Type: Entity_Type_Label: GISDB.IL_QUAD_12K_Index_Py_Nad83 Detailed_Description: Entity_Type: Entity_Type_Label: GISDB.IL_QUAD_15min_Index_An_Nad83 Detailed_Description: Entity_Type: Entity_Type_Label: GISDB.IL_QUAD_15min_Index_Ln_Nad83 Detailed_Description: Entity_Type: Entity_Type_Label: GISDB.IL_QUAD_15min_Index_Py_Nad83 Detailed_Description: Entity_Type: Entity_Type_Label: GISDB.IL_QUAD_24K_Index_An_Nad83 Detailed_Description: Entity_Type: Entity_Type_Label: GISDB.IL_QUAD_24K_Index_Ln_Nad83 Detailed_Description: Entity_Type: Entity_Type_Label: GISDB.IL_QUAD_24K_Index_Py_Nad83 Detailed_Description: Entity_Type: Entity_Type_Label: GISDB.IL_QUAD_250K_Index_An_Nad83 Detailed_Description: Entity_Type: Entity_Type_Label: GISDB.IL_QUAD_250K_Index_Ln_Nad83 Detailed_Description: Entity_Type: Entity_Type_Label: GISDB.IL_QUAD_250K_Index_Py_Nad83 Detailed_Description: Entity_Type: Entity_Type_Label: GISDB.IL_QUAD_Base_Corner_Pt_Nad83 Detailed_Description: Entity_Type: Entity_Type_Label: GISDB.IL_QUAD_Base_Template_Ln_Nad83 Detailed_Description: Entity_Type: Entity_Type_Label: GISDB.IL_QUAD_Base_Template_Py_Nad83