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North American Profile of ISO19115 2003
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20240621
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Michael Lowiec
APTIM
Project Manager
6401 Congress Avenue
Boca Raton
FL
33487
michael.lowiec@aptim.com
US
561-361-3182
Michael Lowiec
Provide topographic and hydrographic beach survey services as part of the City’s annual beach monitoring program along Galveston Island. Horizontal topographic data was collected in NAD 83(2011) U.S. Survey Feet, and vertical data was collected in NAVD88 U.S. Survey Feet.
<DIV STYLE="text-align:Left;"><DIV><DIV><P STYLE="text-align:Justify;margin:0 0 0 0;"><SPAN>Aptim Environmental and Infrastructure, LLC (APTIM) was contracted by City of Galveston, Texas to provide topographic and hydrographic beach survey services as part of the City’s annual beach monitoring program along Galveston Island. The monitoring survey was conducted from reference stations 550+00 to 570+00, which includes 49 depth of closure and 28 wading depth profiles along Galveston Island. In addition, APTIM conducted a UAS/Drone proof of methodology study. APTIM surveyors conducted the beach profile survey and acquired UAS data August 17, 2021 to September 3, 2021. </SPAN></P><P /><P STYLE="text-align:Justify;margin:0 0 0 0;"><SPAN>The 2021 annual beach monitoring of Galveston Island includes topographic and hydrographic surveys of the beach and offshore areas. The survey data is used to satisfy the Department of the Army permit conditions associated with SWG-2014-00448, which requires beach surveys to provide sufficient data to locate the Tyical Jurisdictional Limit, approximate line of vegetation, high tide line and the low tide line. The survey data is also used to monitor the three (3) beach nourishment projects constructed by the City along Galveston Island, namely Historic Seawall Beach, Babe’s Beach, and Dellanera Beach. </SPAN></P><P /><P><SPAN>The scientific monitoring process employed by APTIM provides information necessary to plan, design, and optimize subsequent follow up projects, potentially reducing the need and cost of unnecessary work as well as potentially reducing any environmental impact that may have, or is to be expected to occur. </SPAN></P><P><SPAN>These data represent various coastal features. Coastal features were interpreted from field measurements.</SPAN></P><P><SPAN /></P><P><SPAN /></P><P><SPAN /></P></DIV></DIV></DIV>
These data were collected for the City of Galveston, Texas to satisfy the Department of the Army permit conditions associted with SWG-2014-00448.
2019-11-15T15:00:00
Michael Lowiec
APTIM
Project Manager
6401 Congress Avenue
Boca Raton
FL
33487
michael.lowiec@aptim.com
US
561-361-3182
Beach_Survey_2021
Bathymetric
Profiles
UAS
Drone
Topographic
Survey
<DIV STYLE="text-align:Left;"><DIV><DIV><P><SPAN><SPAN>These data represent the results of data collection/processing for a specific activity and indicates the general existing conditions at the time of collection. As such, it is only valid for its intended use, content, time, and accuracy specifications. The user is responsible for the results of an application of the data other than its intended purpose.</SPAN></SPAN></P><P><SPAN /></P></DIV></DIV></DIV>
The entirety of Galveston Island from the beach to 10,000 ft. offshore.
Michael Lowiec
APTIM
Project Manager
6401 Congress Avenue
Boca Raton
FL
33487
michael.lowiec@aptim.com
US
Michael Lowiec
Version 6.2 (Build 9200) ; Esri ArcGIS 10.7.1.11595
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29.076904
Prior to the start of the survey, reconnaissance of the monuments was conducted to confirm that survey control was in place and undisturbed. Real Time Kinematic Global Positioning System (RTK GPS) was used to locate and confirm survey control for this project. Upon completion of the control reconnaissance survey, beach/upland and nearshore operations were initiated. Cross-sections of the beach in the project area were surveyed using extended rod RTK GPS rovers, standard RTK GPS rovers, and differential leveling techniques (if/when needed). Extended rod RTK GPS rovers were used to augment RTK GPS survey capability into the nearshore. The current systems allow surveyors from APTIM to collect the entire beach profile with RTK GPS technology. The offshore survey was conducted using an ODOM Hydrotrac sounder with digitizer on APTIM's 28-foot Parker survey vessel with a centrally located hull-mounted transducer. Data was digitally stored using HYPACK 2021 Software. A Trimble R8 RTK GPS and a TSS DMS-25 dynamic motion sensor were used onboard the survey vessel to provide instantaneous tide corrections as well as heave, pitch, and roll corrections. Manual tide readings were taken while conducting the onshore portion of the profile to verify onboard tide readings. In order to maintain the vessel navigation along the profile lines, HYPACK navigation software was used. This software provided horizontal position to the sounding data which allowed real-time review of the data in plan view or cross-section format and minimized vessel deviation from the online azimuth. Horizontal and Vertical positioning checks were conducted at the beginning and end of each day using published NGS 2nd order monuments or temporary benchmarks established located in the project area. The sounder was calibrated via bar-checks and a sound velocity probe at the beginning and end of each day. The Valleport SWiFT SVP Sound Velocity Profiler offers a fast additional calibration for sound velocity as compared to the traditional bar-check. Bar-checks were performed from a depth of five (5) feet to a minimum depth of twenty (25) feet. Analog data showing the results of the bar-check calibration was displayed on the sounder charts at five (5) foot increments during descent of the bar.
Upon completion of the field work, data was edited and reduced with Trimble Business Center, HYPACK 2021, and APTIM’s internal software programs. The upland and nearshore portions of the beach profile were viewed and edited in Trimble Business Center and a comma delimited XYZ file was created. The offshore raw digital data was viewed and edited in HYPACK 2021’s Single Beam Editor. The offshore RTK GPS tide data that was collected was compared to the manually collected RTK GPS nearshore tide data, local observed and predicted tides for data verification purposes. Tide corrected offshore data was exported and a comma delimited XYZ file was created. All overlapping profile data was compared in cross sections to ensure system accuracy. The edited beach profile data and offshore profile data were merged and a representative cross-section was derived for each profile line. The cross sections were developed using internal APTIM plotting programs.
Beach_Survey_2021
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20240621