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<idPurp>These data were collected to identify and monitor coastal change along the Illinois Lake Michigan shoreline.</idPurp>
<idAbs>&lt;DIV STYLE="text-align:Left;"&gt;&lt;DIV&gt;&lt;DIV&gt;&lt;P&gt;&lt;SPAN&gt;Singlebeam echosounder data was collected in the nearshore of the Illinois coast of the Illinois Beach State Park in Zion, IL. These data were collected under contract for the Illinois Department of Natural Resources Coastal Management Program. The areas targeted for bathymetric measurements are paired with areas targeted for UAS (unoccupied aerial system) onshore photographic measurements. The bathymetric data were collected as part of a multi-year monitoring program to detect and measure lake-bottom change as it related to erosion of the lake bottom and longshore and offshore sand movement or transport.&lt;/SPAN&gt;&lt;/P&gt;&lt;/DIV&gt;&lt;/DIV&gt;&lt;/DIV&gt;</idAbs>
<idCredit>Acknowledgment of the Illinois State Geological Survey as a data source would be appreciated in products developed from these data, and such acknowledgment as is standard for citation and legal practices. S. Brown, R. Mattheus, K. Pearce, L. Rosario, and E. Spitzer.</idCredit>
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<othConsts>Refer to the Legal Notices of Terms and Conditions of the University of Illinois Web Privacy Policy (http://www.vpaa.uillinois.edu/policies/web_privacy.cfm)for policy statements regarding the following: 1.) Disclaimer of Liability; 2.) Disclaimer of Warranties and Accuracy of Data; 4.) Disclaimer of Endorsement; 5.) Disclaimer for External Links; 6.)Disclaimer of Duty to Continue Provision of Data; 7.)Security; and 8.)Choice of Law. By obtaining these data you agree to the provisions of the University of Illinois Web Privacy Policy, regardless of the manner in which the information was obtained.</othConsts>
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<useLimit>&lt;DIV STYLE="text-align:Left;"&gt;&lt;P STYLE="font-size:16ptmargin:0 0 11 0;"&gt;&lt;SPAN&gt;ISGS information is the property of and copyrighted by the Board of Trustees of the University of Illinois with all rights reserved. University copyright policy is stated in the General Rules Concerning University Organization and Procedure, Article III, Section 4 (http://www.uillinois.edu/trustees/rules.cfm#sec34). Individuals or entities may make fair use of copyrighted ISGS material, such as reproducing a single figure or table, or using a brief text quotation, without obtaining formal permission, but in all cases the Illinois State Geological Survey must be credited as the source of the material. To reproduce ISGS information beyond the fair use standard, permission must be obtained from the ISGS Information Office, 615 East Peabody Drive, Champaign, Illinois 61820, 217-333-4747, info@isgs.illinois.edu. License fees and a license agreement may be required, depending on the proposed usage. Links to these are provided in the Cross References section. Any use of these data is governed by University and campus policies, in particular, but not limited to, the Policy on Appropriate Use of Computers and Network Systems at the University of Illinois at Urbana-Champaign, the ISGS Terms of Use document available at the ISGS Web site, and the University of Illinois Web Privacy Notice. Links to these are provided in the Cross References section. The data described here has no legal basis in the definition of boundaries or property lines and is not intended as a substitute for surveyed locations such as can be determined by a registered Public Land Surveyor. Users should be aware of temporal changes that may have occurred since this dataset was collected and some parts of the data may no longer represent actual surface conditions. Users should not use these data for critical applications without a full awareness of its limitations. Acknowledgement of the Illinois State Geological Survey would be appreciated for products derived from these data.&lt;/SPAN&gt;&lt;/P&gt;&lt;/DIV&gt;</useLimit>
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<measDesc>Vertical positional accuracy was acquired by coupling network RTK-GPS with a Trimble VRS Now instant access real-time kinematic (RTK) internet subscription correction service with less than 5-centimeter RMS accuracy. Access obtained through Verizon cellular service. VRS Now achievable reference stations as shown at https://vrsnow.us/Map/SensorMap.aspx?Lang=en-US include: (Station: IL_Libertyville, Station code: ILLB, Lat: N 42° 17' 42.16639", Lon: W 87° 57' 37.20446", Height:190.441, Sensor type: TRIMBLE NETR5), (Station: IL_Roselle, Station code: ILRO, Lat: N 41° 59' 00.16302", Lon: W 88° 05' 24.56655", Height: 214.576, Sensor type: TRIMBLE NETR9), (Station: IL_Aurora, Station code: ILAR, Lat: N 41° 48' 33.28400", Lon: W 88° 16' 02.24730", Height: 196.856, Sensor type: TRIMBLE NETR9), (Station: IL_Chicago, Station code: ILCH, Lat: N 41° 50' 42.99061", Lon: W 87° 39' 34.51635", Height: 160.007, Sensor type: TRIMBLE NETR9), (Station: IL_McHenry2, Station code: ILM2, Lat: N 42° 18' 31.58775", Lon: W 88° 16' 32.34354", Height: 223.013, Sensor type: TRIMBLE NETR5)</measDesc>
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</date>
</conSpec>
<conExpl>Singlebeam echosounder data were collected during daylight hours under favorable lake (wind and wave) conditions and proper functioning of equipment. During acquisition all system components and collected measurements were monitored in real time by vessel crew to ensure consistency and accuracy. During data collection events, data that did not meet consistency or accuracy expectations (elevation and location values) were excluded and the collection event was repeated to ensure full coverage of mission goals with consistent measurement parameters across the collection footprint. Data acquisition by wading via RTK-GPS may be included where depths were too shallow to collect echosounder data. All data values fall within the expected range of values.
</conExpl>
<conPass>1</conPass>
</ConResult>
</measResult>
<measDateTm>2024-05-08T00:00:00</measDateTm>
</report>
<dataLineage>
<statement>The data values compare favorably to topobathymetric data previously collected through the National Coastal Mapping Program. The overall accuracy is controlled by the following parameters: 1. Reliability of continuous real-time GPS position and elevation fix 2. Vessel motion created by waves
Trimble VRS Now instant access real-time kinematic (RTK) internet subscription correction service &lt; 2 cm RMS accuracy. Access obtained through Verizon cellular service. VRS Now achievable reference stations as shown at https://vrsnow.us/Map/SensorMap.aspx?Lang=en-US include: (Station: IL_Libertyville, Station code: ILLB, Lat: N 42° 17' 42.16639", Lon: W 87° 57' 37.20446", Height:190.441, Sensor type: TRIMBLE NETR5), (Station: IL_Roselle, Station code: ILRO, Lat: N 41° 59' 00.16302", Lon: W 88° 05' 24.56655", Height: 214.576, Sensor type: TRIMBLE NETR9), (Station: IL_Aurora, Station code: ILAR, Lat: N 41° 48' 33.28400", Lon: W 88° 16' 02.24730", Height: 196.856, Sensor type: TRIMBLE NETR9), (Station: IL_Chicago, Station code: ILCH, Lat: N 41° 50' 42.99061", Lon: W 87° 39' 34.51635", Height: 160.007, Sensor type: TRIMBLE NETR9), (Station: IL_McHenry2, Station code: ILM2, Lat: N 42° 18' 31.58775", Lon: W 88° 16' 32.34354", Height: 223.013, Sensor type: TRIMBLE NETR5)
</statement>
<prcStep>
<stepDesc>Acquisition: Acquisition was conducted using the following equipment and sonar components:
Seafloor Systems Inc. HyDrone™ and Seafloor Systems Inc. Hydrolite-DFX™ Dual Frequency Echosounder (28kHz and 200kHz)
Trimble TSC7 receiver with Trimble Access interface and Trimble R12i antenna
The Hydrolite receiver is attached to a rigid pole approximately 2 meters in length that is mounted on the stern of the Hydrone at approximate vessel center for drone boat singlebeam surveys (DBSB) or the port or starboard side of the vessel (17 foot 1987 model year Boston Whaler Montauk) gunwale at the approximate vessel center point for crewed vessel singlebeam surveys (CVSB). The Trimble R12i antenna is on the top of the pole and connected to the Trimble TSC7 receiver. The Hydrolite is connected via Bluetooth to the Trimble Access system. Processing:
Trimble Access is used to offload the sonar data to a non-proprietary CSV file. The file contains geospatial data such as easting, northing, elevation, and sonar depths. The file also contains a sensor number string including high and low frequency values and temperature. The data in the CSV file was overviewed, calculated, and brought into an ArcGIS attribute table. The following describes the columns in the attribute table. The Z value is the high frequency subtracted from the elevation. The high frequency value represents the depth from the sonar receiver head to the lake bottom. The Z_2 value is the low frequency subtracted from the elevation. Low frequency is the depth from the sonar receiver head to a hard substrate which could be the lake bottom or a hard layer beneath the lake bottom.
</stepDesc>
</prcStep>
</dataLineage>
<report dimension="horizontal" type="DQQuanAttAcc">
<measDesc>Navigation data was acquired using the Trimble TSC7 RTK-GPS connected to network VRSNow subscription providing accurate horizontal positioning to less than 5 centimeters. The RTK-GPS was programmed to not record any data if the accuracy was higher than 5 centimeters.</measDesc>
<measResult>
<ConResult>
<conSpec>
<resTitle>Not applicable</resTitle>
<date>
<createDate>2024-05-08T00:00:00</createDate>
</date>
</conSpec>
<conExpl>Singlebeam echosounder data were collected during daylight hours under favorable lake (wind and wave) conditions and proper functioning of equipment. During acquisition all system components and collected measurements were monitored in real time by vessel crew to ensure consistency and accuracy. During data collection events, data that did not meet consistency or accuracy expectations (elevation and location values) were excluded and the collection event was repeated to ensure full coverage of mission goals with consistent measurement parameters across the collection footprint. Data acquisition by wading with RTK-GPS may be included where depths were too shallow to collect echosounder data. All data values fall within the expected range of values.</conExpl>
<conPass>1</conPass>
</ConResult>
</measResult>
<measDateTm>2024-05-08T00:00:00</measDateTm>
</report>
</dqInfo>
<eainfo>
<detailed Name="Summmer2024_Bathy_Lines">
<enttyp>
<enttypd>Bathymetric elevation point measure</enttypd>
<enttypds>Producer defined</enttypds>
<enttypl Sync="TRUE">Summmer2024_Bathy_Lines</enttypl>
<enttypt Sync="TRUE">Feature Class</enttypt>
<enttypc Sync="TRUE">0</enttypc>
</enttyp>
<attr>
<attrlabl Sync="TRUE">FID</attrlabl>
<attalias Sync="TRUE">FID</attalias>
<attrtype Sync="TRUE">OID</attrtype>
<attwidth Sync="TRUE">4</attwidth>
<atprecis Sync="TRUE">0</atprecis>
<attscale Sync="TRUE">0</attscale>
<attrdef Sync="TRUE">Internal feature number.</attrdef>
<attrdefs Sync="TRUE">Esri</attrdefs>
<attrdomv>
<udom Sync="TRUE">Sequential unique whole numbers that are automatically generated.</udom>
</attrdomv>
</attr>
<attr>
<attrlabl Sync="TRUE">Shape</attrlabl>
<attalias Sync="TRUE">Shape</attalias>
<attrtype Sync="TRUE">Geometry</attrtype>
<attwidth Sync="TRUE">0</attwidth>
<atprecis Sync="TRUE">0</atprecis>
<attscale Sync="TRUE">0</attscale>
<attrdef Sync="TRUE">Feature geometry.</attrdef>
<attrdefs Sync="TRUE">Esri</attrdefs>
<attrdomv>
<udom Sync="TRUE">Coordinates defining the features.</udom>
</attrdomv>
</attr>
<attr>
<attrdefs>Producer defined</attrdefs>
<attrlabl Sync="TRUE">ID</attrlabl>
<attalias Sync="TRUE">ID</attalias>
<attrtype Sync="TRUE">Integer</attrtype>
<attwidth Sync="TRUE">10</attwidth>
<atprecis Sync="TRUE">10</atprecis>
<attscale Sync="TRUE">0</attscale>
<attrdef>Feature number exported from RTK-GPS in sequential order as data is collected.</attrdef>
<attrdomv>
<rdom>
<rdommin>1</rdommin>
<rdommax>7158</rdommax>
</rdom>
</attrdomv>
</attr>
<attr>
<attrdefs>Producer defined</attrdefs>
<attrlabl Sync="TRUE">Y</attrlabl>
<attalias Sync="TRUE">Y</attalias>
<attrtype Sync="TRUE">Double</attrtype>
<attwidth Sync="TRUE">19</attwidth>
<atprecis Sync="TRUE">0</atprecis>
<attscale Sync="TRUE">0</attscale>
<attrdef>Northing, or Y-coordinate, NAD 83 (1986) UTM Zone 16N.</attrdef>
<attrdomv>
<rdom>
<rdommin>4702123.19</rdommin>
<rdommax>4704618.352</rdommax>
</rdom>
</attrdomv>
</attr>
<attr>
<attrdefs>Producer defined</attrdefs>
<attrlabl Sync="TRUE">X</attrlabl>
<attalias Sync="TRUE">X</attalias>
<attrtype Sync="TRUE">Double</attrtype>
<attwidth Sync="TRUE">19</attwidth>
<atprecis Sync="TRUE">0</atprecis>
<attscale Sync="TRUE">0</attscale>
<attrdef>Easting, or X-coordinate, NAD 83 (1986) UTM Zone 16N.</attrdef>
<attrdomv>
<rdom>
<rdommin>434109.979</rdommin>
<rdommax>435678.203</rdommax>
</rdom>
</attrdomv>
</attr>
<attr>
<attrlabl Sync="TRUE">Z</attrlabl>
<attalias Sync="TRUE">Z</attalias>
<attrtype Sync="TRUE">Double</attrtype>
<attwidth Sync="TRUE">19</attwidth>
<atprecis Sync="TRUE">0</atprecis>
<attscale Sync="TRUE">0</attscale>
<attrdefs>Producer defined</attrdefs>
<attrdef>Elevation, or Z-coordinate, NAVD 88. The Z value is the high frequency (200kHz) depth value subtracted from the elevation of bottom of antenna pole, providing the lake bottom elevation in meters. The high frequency value represents the depth from the sonar receiver head to the lake bottom. </attrdef>
<attrdomv>
<rdom>
<rdommin>164.572</rdommin>
<rdommax>176.321</rdommax>
</rdom>
</attrdomv>
</attr>
<attr>
<attrlabl Sync="TRUE">Type</attrlabl>
<attalias Sync="TRUE">Type</attalias>
<attrtype Sync="TRUE">String</attrtype>
<attwidth Sync="TRUE">254</attwidth>
<atprecis Sync="TRUE">0</atprecis>
<attscale Sync="TRUE">0</attscale>
<attrdef>Code defining the type of watercraft utilized for collecting each individual point data. DBSB (Drone Boat Singlebeam) refers to data collected in the inner nearshore with a Seafloor Systems Inc. HyDrone™ coupled with RTK-GPS and Seafloor Systems Inc. Hydrolite-DFX™. CVSB (Crewed Vessel Single Beam) refers to data collected in the outer nearshore on a crewed research vessel with RTK-GPS and Seafloor Systems Inc. Hydrolite-DFX™. W (Wading) refers to data collection via wading in the inner nearshore with RTK-GPS.</attrdef>
<attrdefs>Producer defined</attrdefs>
<attrdomv>
<codesetd>
<codesetn>CVSB (Crewed Vessel Singlebeam) </codesetn>
<codesets>Producer defined</codesets>
</codesetd>
</attrdomv>
</attr>
</detailed>
</eainfo>
<mdLang>
<languageCode Sync="TRUE" value="eng"/>
<countryCode Sync="TRUE" value="USA"/>
</mdLang>
<mdHrLv>
<ScopeCd Sync="TRUE" value="005"/>
</mdHrLv>
<mdHrLvName Sync="TRUE">dataset</mdHrLvName>
<refSysInfo>
<RefSystem>
<refSysID>
<identCode Sync="TRUE" code="26916"/>
<idCodeSpace Sync="TRUE">EPSG</idCodeSpace>
<idVersion Sync="TRUE">6.11(3.0.1)</idVersion>
</refSysID>
</RefSystem>
</refSysInfo>
<spatRepInfo>
<VectSpatRep>
<geometObjs Name="Summmer2024_Bathy_Lines">
<geoObjTyp>
<GeoObjTypCd Sync="TRUE" value="004"/>
</geoObjTyp>
<geoObjCnt Sync="TRUE">0</geoObjCnt>
</geometObjs>
<topLvl>
<TopoLevCd Sync="TRUE" value="001"/>
</topLvl>
</VectSpatRep>
</spatRepInfo>
<spdoinfo>
<ptvctinf>
<esriterm Name="Summmer2024_Bathy_Lines">
<efeatyp Sync="TRUE">Simple</efeatyp>
<efeageom Sync="TRUE" code="1"/>
<esritopo Sync="TRUE">FALSE</esritopo>
<efeacnt Sync="TRUE">0</efeacnt>
<spindex Sync="TRUE">FALSE</spindex>
<linrefer Sync="TRUE">TRUE</linrefer>
</esriterm>
</ptvctinf>
</spdoinfo>
<mdDateSt Sync="TRUE">20250508</mdDateSt>
<mdChar>
<CharSetCd value="004"/>
</mdChar>
</metadata>
