Version history for U.S. Geological Survey data release:

Cramer, J.M., Brosnahan, S.M., Ackerman, S.D., Gazoorian, C.L., and Over, J.R., 2024, Elevation models, aerial imagery, LiDAR point clouds (LPCs), vegetation survey, and GPS data collected during uncrewed aircraft systems (UAS) operations at Lower Darby Creek, Darby Township, Pennsylvania, August 28 to September 1, 2023 (ver. 1.1, July 2025): U.S. Geological Survey data release, https://doi.org/10.5066/P1HRSCZH.

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Version 1 posted online December 5, 2024

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Version 1.1 revised and reposted online July 28, 2025

Changes in version 1.1

Dataset: True-color and Multispectral aerial imagery collected during uncrewed aircraft systems (UAS) operations - Lower Darby Creek, Darby Township, Pennsylvania, August 28 - September 1, 2023 (ver. 1.1, July 2025)

1. 2023020FA_AerialImagery_Metadata.xml was updated to document the following changes to the data and data dictionary files including including adding a lineage process step describing the transformation of image locations to UTM coordinates and the columns appended to the csv file:
	a. 2023020FA_AltumMS_ImageLocs.csv, 2023020FA_RicohRGB_ImageLocs.csv, 2023020FA_YSMP_ImageLocs.csv - Columns H, I, J (Map Datum for NAD83 (2011) /UTM zone 18N, Northing, Easting) were added and the files were converted from tab-delimited to comma delimited to be in agreement with the filename extension.
	b. 2023020FA_RicohRGB_ImageLocs.csv - Col C (spatial reference) was missing from version 1 files.
	c. 2023020FA_Aerial_ImageLocs_DataDictionary.csv - Three separate data dictionaries for the three image locations files were combined into this new file. The columns for the UTM datum and coordinates were added at rows 10,11,12,21,22,23,32,33,34.

Dataset: Ground reference vegetation data and photos collected during uncrewed aircraft systems (UAS) operations at Lower Darby Creek Superfund Site and John Heinz NWR, Darby Township, Pennsylvania, August 28 to September 1, 2023 (ver 1.1, July 2025)
	
2. 2023020FA_Vegetation_Metadata.xml was updated to document the following changes to the data and data dictionary files including adding a lineage process step describing the transformation of image locations to UTM coordinates and the columns appended to the csv file:
	a. 2023020FA_ClearviewVegSurvey_ImageLocs.csv - Columns H, I, J (Map Datum for NAD83 (2011) /UTM zone 18N, Northing, Easting) were added and the files were converted from tab-delimited to comma delimited to be in agreement with the filename extension.
	b. 2023020FA_Aerial_ImageLocs_DataDictionary.csv - The columns for the UTM datum and coordinates were added at rows 22,23,24.

Earlier versions are available by contacting WHSC_data_contact@usgs.gov