Morena N. Hammer Stephen B. DeLong Jessie L. Vermeer Mark A. Bauer Matthew A. Burgess Rezagene A. Milani Tim J. Kuhn Melissa P. Steller Victoria M. Scholl 20250908 1 raster digital data ScienceBase U.S. Geological Survey https://doi.org/10.5066/P13YDQIZ Digital terrain models (DTMs) generated from lidar data collected during multiple field campaigns in Central and South Ackerson Meadow, Yosemite National Park, California, November 2023. Small, Uncrewed Aircraft Systems (sUAS) collected lidar data on November 5-6th, 2023, as the first post-restoration representation of the meadow complex. DTM data is the bare earth representation of the meadow (without vegetation or other features). DTMs were derived to aid the National Park Service (NPS) in monitoring and assessing the pre- and post-restoration work of Central and South Ackerson Meadow. 20231105 20231106 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 DTM digital terrain model USGS Metadata Identifier USGS:68150066d4be0252ee166505 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 U.S. Geological Survey - National Uncrewed Systems Office for the collection of LPCs. Funding was supported by the National Park Service (NPS) and allied partners. File Name: AckersonMeadows_Nov2023_DTM.zip File Size: <32 MB Operating System: Windows 11. Software utilized: Scripter Golden Software ver 5.0.92.488, ArcGIS Pro 3.4.3. DTMs were assessed by comparing the horizontal and vertical alignment to previously collected lidar data from 2019 (https://rockyweb.usgs.gov/vdelivery/Datasets/Staged/Elevation/LPC/Projects/CA_YosemiteNP_2019_D19/CA_YosemiteNP_2019/). Data falls within expected ranges. Data are complete. Horizontal accuracy of the Central and South Ackerson DTMs was not assessed. Vertical accuracy of the Central and South Ackerson DTMs are -0.0229 meters and 0.0158 meters, respectively. 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. DTM raster data were derived with Scripter (ver 5.0.92.488) kriging workflows from classified lidar point clouds (LPCs). The following settings were used for kriging: cell resolution step of 0.5 x 0.5 meters, search radius 20, search angle 0, search number of sectors 4, search maximum data 128, search minimum data 1, search data per sector 32, and search maximum empty sectors 1. Point cloud classification accuracy was compared to RTK GNSS and vegetation survey notes. Horizontal and vertical alignments were compared by subtracting DTMs on 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/). Central and South Ackerson Meadow LPCs were z translated by -0.0229 and 0.0158 meters, respectively, using LAStools (ver v2.0.3) to align with the control 2019 dataset. Horizontal alignment was not adjusted. USGS LPC's CA_YosemiteNP_2019_D19 2025 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 Raster Pixel 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 Ackerson DTM tile Raster geospatial tile. Attribute information are representative of one tile. Producer Defined Value Unique elevation values contained in each raster cell. Producer Defined 1403 1450 meter 0.5 DTM data are in raster .tif format. 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