Morena N. Hammer Stephen B. DeLong Jessie L. Vermeer Rezagene A. Milani Tim J. Kuhn Melissa P. Steller Mark A. Bauer Matthew A. Burgess Victoria M. Scholl 20250908 1 spreadsheet ScienceBase U.S. Geological Survey https://doi.org/10.5066/P13YDQIZ Real-time kinematic (RTK) global navigation satellite system (GNSS) data of Central and South Ackerson Meadow, Yosemite National Park, California, June 2023. Data was used for spatially referencing terrestrial lidar scanning (TLS) surveys and investigating UAS lidar point return depth/penetration through vegetation, point classification methods, and alignment to control datasets. RTK GNSS survey data were collected to aid the National Park Service (NPS) in analyzing lidar data and assessing the pre- and post-restoration work of Central and South Ackerson Meadow. 20230626 20230627 ground condition Complete As needed -119.85518 -119.82050 37.84822 37.82918 ISO 19115 Topic Category elevation None erosion post-restoration pre-restoration montane meadow meadow degradation Sierra Nevada meadow meadow restoration restoration RTK RTK GNSS GPS GNSS USGS Metadata Identifier USGS:6814fed8d4be0252ee1664ff Places Ackerson Meadow Ackerson Meadow South Yosemite National Park California Sierra Nevada None. Please see 'Distribution Info' for details. None. Users are advised to read the dataset's metadata thoroughly to understand appropriate use and data limitations. Morena N. Hammer U.S. Geological Survey Geologist mailing address

1992 Folwell Ave

St. Paul Minnesota 55108 United States NA NA mhammer@usgs.gov Funding was supported by the National Park Service (NPS) and allied partners. File Name: AckersonMeadows_June2023_RTK_GNSS.zip File Size: <12 KB Operating System: Windows 11. Software utilized: Trimble Business Center Software 5.7, Leica Infinity Software v4.0.0.44003. Attribute accuracy values are not reported. Data falls within expected ranges. Data are complete. Horizontal vector accuracy was recorded for each point. See csv file. Vertical vector accuracy was recorded for each point. See csv file. RTK GNSS data were collected with Trimble R10 and Leica GS15 and CS15 antenna/controller kits on June 26-27th, 2023. Roving RTK controllers and RTK points taken on TLS targets were at a rod height of 2.053 meters. RTK points taken at TLS target locations were associated with RIEGL 100mm cylinder type reflectors. Collected data were post-processed using Online Positioning User Service (OPUS) corrections in Trimble Business Center Software (v 5.7) and Leica Infinity Software (v44.0.0.44003). 2024 Morena N. Hammer U.S. Geological Survey Geologist mailing and physical

1992 Folwell Ave

St. Paul Minnesota 55108 United States NA NA mhammer@usgs.gov Universal Transverse Mercator 11 0.9996 -117.0 0.0 500000.0 0.0 coordinate pair 0.5 0.5 meters NAD83_NATIONAL_SPATIAL_REFERENCE_SYSTEM_2011 GRS 1980 6378137.0 298.257222101 North American Vertical Datum of 1988 0.01 meters Explicit elevation coordinate included with horizontal coordinates 0_AckersonMeadows_June2023_all_RTK_GNSS_data_READ_ME.csv Comma Separated Value (CSV) file containing data. Producer Defined A File describes use of the 4 RTK GNSS data sheets in associated directory. Producer Defined File describes use of the 4 RTK GNSS data sheets in associated directory. 1_AckersonMeadows_June2023_TLS_ack_RTK_GNSS_data.csv Comma Separated Value (CSV) file containing data of RTK GNSS TLS reflector targets. TLS 'ack' project. Producer Defined PointID Point ID or Name. Producer Defined ack_base1 base control point Producer defined rebar1 control point 1 Producer defined target5 target control point 5 Producer defined target6 target control point 6 Producer defined target7 target control point 7 Producer defined Easting_m Easting (meters) in NAD83 2011 UTM Zone 11 N geoid 12b. Producer Defined 249534.945 249650.801 Northing_m Northing (meters) in NAD83 2011 UTM Zone 11 N geoid 12b. Producer Defined 4191465.984 4191525.722 Elevation_m Orthometric height in meters. Producer Defined 1407.927 1408.866 GNSS_Vector_Observation_H_Precision Horizontal vector precision. Producer Defined NA No Data Producer defined 0.008 0.01 GNSS_Vector_Observation_V_Precision Vertical vector precision. Producer Defined NA No Data Producer defined 0.013 0.017 RodHeight_m Height of rod used in roving or target RTK GNSS collection. Producer Defined NA No Data Producer defined 2.053 2.053 Reflector_Target_Type Type of reflector target. Producer Defined NA No Data Producer defined RIEGL cylindrical reflector 100 mm type of reflector target Producer defined 1_AckersonMeadows_June2023_TLS_ynp_RTK_GNSS_data.csv Comma Separated Value (CSV) file containing data of RTK GNSS TLS reflector targets. TLS 'ynp' project. Producer Defined PointID Point ID or Name. Producer Defined ack_base2 base control point Producer defined control_1 target control point 1 Producer defined control_2 target control point 2 Producer defined control_4 target control point 4 Producer defined control_5 target control point 5 Producer defined control_7 target control point 7 Producer defined Easting_m Easting (meters) in NAD83 2011 UTM Zone 11 N geoid 12b. Producer Defined 249497.936 250036.565 Northing_m Northing (meters) in NAD83 2011 UTM Zone 11 N geoid 12b. Producer Defined 4191372.449 4191610.18 Elevation_m Orthometric height in meters. Producer Defined 1407.343 1412.404 GNSS_Vector_Observation_H_Precision Horizontal vector precision. Producer Defined NA No Data Producer defined 0.013 0.02 GNSS_Vector_Observation_V_Precision Vertical vector precision. Producer Defined NA No Data Producer defined 0.022 0.047 RodHeight_m Height of rod used in roving or target RTK collection. Producer Defined NA No Data Producer defined 2.053 2.053 Reflector_Target_Type Type of target reflector. Producer Defined NA No Data Producer defined RIEGL cylindrical reflector 100 mm type of reflector target Producer defined 1_CentralAckerson_June2023_RTK_GNSS_survey_data.csv Comma Separated Value (CSV) file containing data of RTK GNSS survey points across Central Ackerson Meadow. Producer Defined Point_Id Point ID or name. Producer Defined point ID or name Point_Role Type of point. Producer Defined Control control point Producer defined GNSSPhaseMeasuredRTK Roving RTK GNSS collected point Producer defined Easting_m Easting (meters) in NAD83 2011 UTM Zone 11 N geoid 12b. Producer Defined 249490.7391 251049.9243 Northing_m Northing (meters) in NAD83 2011 UTM Zone 11 N geoid 12b. Producer Defined 4191336.206 4192287.412 Ortho__Height_m Orthometric height in meters. Producer Defined 1406.4116 1428.8055 CQ_3D Coordinate quality of combined vertical and horizontal vector. Producer Defined 0.0 0.0314 CQ_2D Coordinate quality of horizontal (plane) vector. Producer Defined 0.0 0.0194 CQ_1D Coordinate quality of vertical (height) vector. Producer Defined 0.0 0.026 SD_Easting Easting standard deviation. Producer Defined 0.0 0.014 SD_Northing Northing standard deviation. Producer Defined 0.0 0.0173 notes2 Field notes taken at point location. Producer Defined NA No Data Producer defined Notes of vegetation type and density taken at point location veg_density Vegetation density at point. Producer Defined NA No Data Producer defined Medium medium density vegetation Producer defined Low low density vegetation Producer defined None not applicable Producer defined High high density vegetation Producer defined Barren no vegetation, exposed Producer defined Water no vegetation, water Producer defined Rebar rebar point Producer defined RodHeight_m Height of rod used in roving RTK GNSS collection. Producer Defined NA No Data Producer defined 2.053 2.053 1_SouthAckerson_June2023_RTK_GNSS_survey_data.csv Comma Separated Value (CSV) file containing data of RTK GNSS survey points across South Ackerson Meadow. Producer Defined Point_ID Point ID or name. Producer Defined point ID or name Elevation_m Orthometric height in meters. Producer Defined 1402.359 1418.517 Northing_m Northing (meters) in NAD83 2011 UTM Zone 11 N geoid 12b. Producer Defined 4190824.693 4191525.905 Easting_m Easting (meters) in NAD83 2011 UTM Zone 11 N geoid 12b. Producer Defined 249417.592 250818.987 GNSS_Vector_Observation_RMS Combined vertical and horizontal vector precision. Producer Defined 0.0 0.035 GNSS_Vector_Observation_H_Precision Horizontal vector precision. Producer Defined 0.0 27.391 GNSS_Vector_Observation_V_Precision Vertical vector precision. Producer Defined 0.0 34.106 notes2 Field notes taken at point location. Producer Defined NA No Data Producer defined Field notes of vegetation type and density taken at the point location veg_density Vegetation density at point. Producer Defined NA No Data Producer defined None not applicable Producer defined Low low density vegetation Producer defined High high density vegetation Producer defined Medium medium density vegetation Producer defined RodHeight_m Height of rod used in roving RTK GNSS collection. Producer Defined NA No Data Producer defined 2.053 2.053 RTK GNSS data for Ackerson Meadows. A total of 100 height and vegetation survey points were collected for South and Central Ackerson Meadow each. These are represented in two different csv files. Additionally, RTK GNSS data of control targets used for two TLS LPC (lidar point cloud) processing are reported. The two TLS projects are differentiated by names 'ynp' and 'ack'. Two csv files are included for each TLS project. Hammer, M.N., DeLong, S.B., Vermeer, J.L., Bauer, M.A., Scholl, V.M., Burgess, M.A., Kuhn, T.J., Milani, R.A., and Steller, M.P., 2025. Lidar point clouds, rasters, and RTK GNSS survey data for pre- and post-restoration of Ackerson Meadows, Yosemite National Park, California, USA. U.S. Geological Survey data release. https://doi.org/10.5066/P13YDQIZ Morena N. Hammer U.S. Geological Survey Geologist mailing and physical

1992 Folwell Ave

St. Paul Minnesota 55108 United States NA NA mhammer@usgs.gov This database has been approved for release by the U.S. Geological Survey (USGS). Although this database has been subjected to rigorous review and is substantially complete, the USGS reserves the right to revise the data pursuant to further analysis and review. Furthermore, it is released on condition that neither the USGS nor the U.S. Government may be held liable for any damages resulting from its authorized or unauthorized use. Although these data have been processed successfully on a computer System at the USGS, no warranty, expressed or implied is made regarding the display or utility of the data for other purposes, nor on any other system, nor shall the act of distribution constitute any such warranty. The USGS or the U.S. Government shall not be held liable for improper or incorrect use of the data described and/or contained herein. Any use of trade, firm, or product names is for descriptive purposes only and does not imply endorsement by the U.S. Government. Any use of trade, firm, or product names is for descriptive purposes only and does not imply endorsement by the U.S. Government. Digital Data https://doi.org/10.5066/P13YDQIZ None 20260319 Morena N. Hammer U.S. Geological Survey Geologist mailing address

1992 Folwell Ave

St. Paul Minnesota 55108 US NA NA mhammer@usgs.gov FGDC Content Standard for Digital Geospatial Metadata FGDC-STD-001-1998