Morena N. Hammer Stephen B. DeLong Jessie L. Vermeer Rezagene A. Milani Tim J. Kuhn Melissa P. Steller Matthew A. Burgess Mark A. Bauer Victoria M. Scholl 20250908 1 lidar point cloud data ScienceBase U.S. Geological Survey https://doi.org/10.5066/P13YDQIZ Lidar point clouds (LPCs) were generated from lidar data collected during terrestrial laser scanning (TLS) surveys in June 2023 of western Central Ackerson Meadow. Data were collected between June 25-27th, 2023 as the first pre-restoration collection of the meadow complex. More information regarding the TLS processing methods can be found in the Data Quality section. LPCs were collected to aid the National Park Service (NPS) in monitoring and assessing the pre- and post-restoration work of Central and South Ackerson Meadow. 20230625 20230627 ground condition Complete As needed -119.85518 -119.82050 37.84822 37.82918 None Lidar TLS terrestrial laser scanning RiSCAN Point Cloud Bare Earth RIEGL pre-restoration erosion Meadow Wetland meadow restoration mid-elevation meadow Sierra Nevada Range post-restoration USGS Metadata Identifier USGS:6814fe92d4be0252ee1664fb 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_TLS_LPC.zip File Size: ~3.6 GB. Operating System: Windows 11. Software utilized: Terrascan ver 025.010, LAStools ver v2.0.3, ArcPro 3.4.3, Scripter Golden Software ver 5.0.92.488, RIEGL VZ-400i, RiSCAN Pro v2.21.3, CloudCompare Software v2.12.4, Trimble Business Center Software v5.7. Dataset values are accurate to true values. Data falls within expected ranges. Data are complete. The TLS LPCs were not assessed for horizontal accuracy. The TLS LPCs were not assessed for vertical accuracy. U.S. Geological Survey 20210528 lidar point cloud data https://rockyweb.usgs.gov/vdelivery/Datasets/Staged/Elevation/LPC/Projects/CA_YosemiteNP_2019_D19/CA_YosemiteNP_2019/ lidar point cloud data 20210528 ground condition USGS LPC's CA_YosemiteNP_2019_D19 Utilized as control data for analyses and alignments. Two TLS surveys were completed in June 2023 using a RIEGL VZ-400i scanner. LPCs were post processed for alignment and georeferencing in RiSCAN PRO software (v2.2.13). Trimble Business Center Software v5.7, with OPUS corrections applied to RTK GNSS data, was used to post process TLS reflector target locations for initial georeferencing in RiSCAN PRO software. The first survey is denoted in the directories as 'ynp' and encompasses a larger, continuous section of the meadow. The second survey is denoted as 'ack' in the file directories, and provides higher point density LPCs of two features (barn and large rock) contained within the AOI of 'ynp'. These two features appear as separate tiles in 'ack' and will not overlap each other. 2025 TLS LPCs were assigned respective coordinate system information using LAStools (ver v2.0.3). TLS LPCs were ICP (iterative closest point) aligned to flat, stable surfaces from a previous, geoid12b corrected control lidar dataset from 2019 (https://rockyweb.usgs.gov/vdelivery/Datasets/Staged/Elevation/LPC/Projects/CA_YosemiteNP_2019_D19/CA_YosemiteNP_2019/) with CloudCompare software (v2.12.4). Alignments were assessed by evaluating ICP RMS alignment values and by assessing differenced DTMs from 2019 lidar control dataset in ArcGIS Pro. DTMs were processed in Scripter Golden Software (ver 5.0.92.488). USGS LPC's CA_YosemiteNP_2019_D19 2025 TLS LPCs were classified in Terrascan Software (ver 025.010) using macro automation processing steps (see below). Classification was assessed by creating DTMs from Scripter Golden Software (ver 5.0.92.488) and evaluating in ArcPro (ver 3.4.3). Ground and vegetation classification macros steps: FnScanClassifyClass("Any",2,0) FnScanClassifySurface("2",31,0.150,0,0) FnScanClassifyGround("31",32,"31",1,6.0,99.00,9.00,4.00,0,5.0,0,2.0,0,0,0) FnScanClassifyClass("2,31",1,0) FnScanClassifyClass("32",2,0) FnScanClassifyClass("1",10,0) FnScanClassifyHgtGrd(2,100.0,10,4,0.700,3.000,0) FnScanClassifyHgtGrd(2,100.0,10,3,0.000,0.700,0) FnScanClassifyHgtGrd(2,100.0,10,5,3.000,900.000,0) Further manual classification was completed for reflected points. 2025 Point Point Universal Transverse Mercator 11 0.9996 -117.0 0.0 500000.0 0.0 coordinate pair 0.04757 0.04757 meters NAD83_NATIONAL_SPATIAL_REFERENCE_SYSTEM_2011 GRS 1980 6378137.0 298.257222101 North American Vertical Datum of 1988 0.01 meters Attribute values CentralAckerson_ack_TLS_allpoints_laz_tile_# laz tiles for ack TLS survey. '#' refers to the tile number. Producer Defined EASTING Easting coordinate in NAD83 (2011) UTM 11N, geoid12b. Producer Defined 249505.71 249791.45 NORTHING Northing coordinate in NAD83 (2011) UTM 11N, geoid12b. Producer Defined 4191454.83 4191609.69 ELEVATION Orthometric height (meters). Producer Defined 1407.18 1447.58 CLASSIFICATION Classification of points. Producer Defined 4 Medium vegetation class. Producer defined 3 Low vegetation class. Producer defined 2 Ground class. Producer defined 5 High vegetation class. Producer defined 1 Default/unclassified class. Producer defined 6 Building class. Producer defined INTENSITY Intensity value of points. Producer Defined 10922 65535 RETURN_NUMBER Return number. Producer Defined 1 1 RETURN_COUNTS Return counts of point. Producer Defined 0 1 SCAN_ANGLE Scan angle. Producer Defined 0 0 USER_DATA User ID. Producer Defined 0 0 POINT_SOURCE_ID Point source ID. Producer Defined 0 0 GPS_TIME GPS time. Producer Defined 37184.352931 49916.962195 RED Red value. Producer Defined 10752 65280 GREEN Green value. Producer Defined 10752 65280 BLUE Blue value. Producer Defined 10752 65280 CentralAckerson_TLS_tile_######_####### laz tiles from ynp TLS survey. '#' refers to tile number. Producer Defined EASTING Easting coordinate of NAD83 (2011) UTM 11N, geoid 12b. Meters. Producer Defined 249081.24 250523.83 NORTHING Northing coordinate of NAD83 (2011) UTM 11N, geoid 12b. Meters. Producer Defined 4191092.85 4191934.12 ELEVATION Orthometric height (meters). Producer Defined 1390.01 1497.40 CLASSIFICATION Point classification. Producer Defined 2 Ground class. Producer defined 3 Low vegetation class. Producer defined 5 High vegetation class. Producer defined 1 Default/unclassified class. Producer defined 4 Medium vegetation class. Producer defined 6 Building class. Producer defined 19 Car class. Producer defined INTENSITY Intensity value. Producer Defined 0 65535 RETURN_NUMBER Return number of point. Producer Defined 1 1 RETURN_NUMBER_COUNTS Counts of return number. Producer Defined 1 1 SCAN_ANGLE Scan angle of point. Producer Defined 0 0 USER_DATA User data of point. Producer Defined 0 0 POINT_SOURCE_ID Point sour ID. Producer Defined 0 0 GPS_TIME GPS time of point. Producer Defined 45609.693911 57263.093569 RED Red value. Producer Defined 0 65280 GREEN Green value. Producer Defined 0 65280 BLUE Blue value. Producer Defined 0 65280 TLS LPC data files are in .laz format. Detailed attribute information are reported for the two TLS surveys, denoted as 'ack' and 'ynp'. 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