HAWLEYC_2025-04-29_D54F Eva LouiseLoudermilkUSDA Forest Service, Southern Research Station, Athens GAResearch Ecologist

320 Green Street Athens GA 30602 United States

louise.loudermilk@usda.gov https://orcid.org/0000-0001-8191-8670 ChristieHawleyUSDA Forest Service, Southern Research Station, Athens GAForester

320 Green Street Athens GA 30602 United States

christie.m.hawley@usda.gov https://orcid.org/0000-0001-9105-2065 AndrewHudakUSDA Forest Service, Rocky Mountain Research Station, Moscow IDResearch Forester

1221 South Main Street Moscow ID 83843 United States

andrew.hudak@usda.gov https://orcid.org/0000-0001-7480-1458 ChadHoffmanColorado State University, Department of Forest and Rangeland StewardshipProfessor

472 Campus Delivery Fort Collins CO 80523-1472 United States

c.hoffman@colostate.edu https://orcid.org/0000-0001-8715-937X DerekWallaceUSDA Forest Service, Southern Research Station, Athens, GAderek.wallace@usda.gov https://orcid.org/0009-0001-2533-4838 contributor MelanieTaylorUSDA Forest Service, Southern Research Station, Athens, GAmelanie.k.taylor@usda.gov https://orcid.org/0000-0003-4611-5156 contributor To characterize fine-scale variations in vegetation structure, quantify heterogeneity, and capture fuel estimation and consumption, clip plot, macroplot, and hemispherical photographs were taken. This data set provides the photographs collected before (December 2021) and after (February 2022) the prescribed burns. longleaf pineprescribed firefuel heterogeneityfuel distributionvegetationOsceola National Forest 2022winter burn plotsNonephotoData Types and Measurement Variables This work is licensed under the Creative Commons Attribution 4.0 International License. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/. Winter Burn Plots, Osceola National Forest, Lake City, Florida, USA -82.413301-82.40853830.23921930.234965 2021-12-032022-02-07 https://schema.org/archivedAthttps://tier2.wfsi-data.org/HAWLEYC_2025-04-29_D54F/https://schema.org/archivedAthttps://app.globus.org/file-manager?origin_id=095b965e-aa6f-4774-83f8-bf49706d753c&origin_path=/HAWLEYC_2025-04-29_D54F/ ChristieHawleyUSDA Forest Service, Southern Research Station, Athens GAForester

320 Green Street Athens GA 30602 United States

christie.m.hawley@usda.gov https://orcid.org/0000-0001-9105-2065 Osceola National Forest is a 200,000-acre National Forest between Lake City, FL, and Jacksonville, FL, bisected by Interstate 10. The long-term winter burn plots were installed in the early 1960s for research and education. The winter burn plots are east of Ocean Pond off Forest Service Road 266. They are burned on 1-, 2-, and 4-year rotations. There are also unburned plots (check plots).In 2022, eighteen burn units (six 1-year, six 2-year, six 4-year) were available for prescribed burning. All 1-, 2-, and 4-year units were prescribed burns on February 3 and 4, 2022. See Burn_Unit_Layout_Osceola_2022.pdf for a schematic of the burn units.In 2021 and 2022, sampling occurred in nine randomly selected burn units—three 1-year, three 2-year, and three 4-year units.At each selected burn unit, an edge and interior transect were established where the edge transect was parallel to the burn unit edge and the interior transect was perpendicular to the edge transect. Four 5x5 meter macroplots were established at each burn unit, where two 5x5 meter macroplots were along the edge transect and two 5x5 meter macroplots were along the interior transect. Along each transect, one 5x5 was designated for pre-burn sampling and the other for post-burn sampling.In each edge 5x5 meter macroplot, two 3D fuels clip plots were established—one at the center and one randomly selected. In each of the interior 5x5 meter macroplots, three 3D fuel clip plots were established—one at the center and two randomly selected. In total, 45 pre-burn and 45 post-burn 3D clip plots were established, with five pre-burn and five post-burn 3D fuel clip plots sampled in each burn unit. Before the prescribed burn, nadir and oblique photographs were taken at the pre- and post-burn 3D fuels clip plots. After the prescribed burn, nadir and oblique photographs were taken at each 3D fuels post-burn clip plot.Before and after the prescribed burns, at the 5x5 meter macroplots, photographs were taken from outside the macroplot looking into it. Two to three photographs focused on the entire 5x5 meter macroplot or 3D fuels clip plots at each cardinal direction.At the 5x5 meter macroplot center, hemispherical photos were taken with the top of the camera facing north (the top of the photo captures the northern side of each plot). Hemispherical photos were taken before the prescribed burns. These photos were taken approximately 6 feet above ground level.Photographs were taken using an Olympus Stylus Tough TG-4 camera. The hemispherical photos were captured using a Nikon FC-E8 Fisheye Converter Lens attached to the camera. Camera specificationsCamera maker = OlympusCamera model = TG-4F-stop = f/2.8Exposure time = 1/125 secondsISO speed = ISO-100Focal length = 4 mmMax aperture = 3Metering mode = Pattern Image specificationsDimensions = 4608 x 3456Width = 4608 pixelsHeight = 3456 pixelsHorizontal resolution = 314 dpiVertical resolution = 314 dpiBit depth = 24Resolution Unit = 2Color representation = sRGB At these burn units, a range of data was collected, and instruments were deployed to characterize fine-scale variations in vegetation structure, quantify spatial heterogeneity, and measure fuel estimation and consumption. Datasets can be located by searching the portal using the keywords “Osceola National Forest 2022” and/or “winter burn plots.” Chad Hoffman Colorado State University C.Hoffman@colostate.edu https://orcid.org/0000-0001-8715-937X Principal Investigator Andrew Hudak USDA FS RMRS andrew.hudak@usda.gov https://orcid.org/0000-0001-7480-1458 Principal Investigator

Chad Hoffman

Andrew Hudak

U. S. Department of Defense (DoD), Strategic Environmental Research and Development Program (SERDP) http://dx.doi.org/10.13039/100013316 RC19-1119 U. S. Department of Defense (DoD), Strategic Environmental Research and Development Program (SERDP) http://dx.doi.org/10.13039/100013316 RC20-1346