Travis J. Kropuenske Jeffrey R. Irwin Mahesh Shrestha Garrison Gross Joshua D Mann 20260224 tabular digital data Travis J. Kropuenske ORCID 0000-0002-3269-4225 Jeffrey R. Irwin ORCiD 0000-0001-5828-0787 Mahesh Shrestha ORCiD 0000-0002-8368-6399 Joshua D Mann ORCiD 0000-0002-4748-0836 Garrison Gross ORCiD 0009-0005-5427-7691 https://doi.org/10.5066/P13MCGPC Scientists and engineers from the U.S. Geological Survey (USGS) Earth Resources Observation and Science Center (EROS) Cal/Val Center of Excellence (ECCOE) collected in situ measurements using field spectrometers to support the validation of surface reflectance products derived from Earth observing remote sensing imagery. Data provided in this data release were collected during select Earth observing satellite overpasses. Additionally, multiple hourly collections were made on September 26, 2025, outside of satellite overpasses, for site characterization purposes. All of these collections occurred during the months of March through September 2025 at the USGS EROS facility in Minnehaha County, South Dakota. Each field collection file includes the calculated surface reflectance of each wavelength collected using a dual field spectrometer methodology. The dual field spectrometer methodology allows for the calculated surface reflectance of each wavelength to be computed using one or both of the spectrometers. The use of the dual field spectrometers system reduces uncertainty in the field measurements by accounting for changes in solar irradiance. Both single and dual spectrometer calculated surface reflectance are included with this dataset. The differing methodologies of the calculated surface reflectance data are denoted as "Single Spectrometer" and "Dual Spectrometer". Field spectrometer data are provided as Comma Separated Values (CSV) files and GeoPackage files. The U.S. Geological Survey (USGS) Earth Resources Observation and Science Center (EROS) Cal/Val Center of Excellence (ECCOE) surface reflectance validation team is committed to validation of Landsat derived surface reflectance products. The Landsat surface reflectance products are now an operational product after the release of Landsat Collection 2 in December 2020. As the number of users and applications relying upon the surface reflectance product continues to grow, the need for validation also increases. ECCOE is dedicated to expanding the validation effort by collecting radiance data over a target using field spectrometers. These in-situ measurements can be converted to surface reflectance values, which allows the field collected data to be used as a validation source for the Landsat surface reflectance product. The data provided in this release are intended for validation of Earth observing optical remote sensing surface reflectance products. While the primary focus of the ECCOE is validation of the Landsat surface reflectance product, the data can potentially be used for validation of other Earth observing optical satellites at the discretion of the user. The data obtained through ScienceBase at https://www.sciencebase.gov/catalog/item/6973ab65d4be0235ce7e947c are considered the "best available" data from the USGS. For questions on distribution, please refer to the Distribution Section, Contact Information. For processing, please refer to the Data Quality Section, Processing Step, Contact Information. 20250312 20250926 ground condition Complete None planned -96.63918 -96.60416 43.75213 43.72385 ISO 19115 Topic Category imageryBaseMapsEarthCover None Landsat Level 2 Field Spectrometer Landsat Landsat 8 Landsat 9 Surface Reflectance Surface Reflectance Validation Sentinel 2 EnMAP Environmental Mapping and Analysis Program USGS Metadata Identifier USGS:6973ab65d4be0235ce7e947c None South Dakota Minnehaha County USGS EROS Center Unless otherwise stated, all data, metadata and related materials are considered to satisfy the quality standards relative to the purpose for which the data were collected. Although these data and associated metadata have been reviewed for accuracy and completeness and approved for release by the U.S. Geological Survey (USGS), no warranty expressed or implied is made regarding the display or utility of the data for other purposes, nor on all computer systems, nor shall the act of distribution constitute any such warranty. Although these data have been processed successfully on a computer system at the U.S. Geological Survey (USGS), no warranty expressed or implied is made regarding the display or utility of the data for other purposes, nor on all computer systems, 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. Jeffrey R. Irwin U.S. Geological Survey Earth Resources Observation and Science Center Geographer mailing address

47914 252nd Street

Sioux Falls SD 57198 United States 605-594-2731 605-594-6529 jrirwin@usgs.gov Environment as of Metadata Creation: Microsoft Windows 11 Enterprise Version 23H2. Build 22631.6345 The Analytical Spectral Device FieldSpec 4 is calibrated by Analytical Spectral Devices, Inc. The device is identified as having a radiometric calibration accuracy of +/- 5% from 400 - 900 nm, increasing to +/- 8% at 2200 nm. A field laptop is used with the Fieldspec 4 for recording of radiometric data and integration of Coordinated Universal Time (UTC) from the laptop. The laptop establishment of UTC varies, with an estimated accuracy at +/- 30 seconds (clock drift between monthly synchronizing events). The Spectralon Panels used within the field collection have average uncertainties of 0.0064 (250-600nm), 0.0042 (601-1500nm), 0.0107 (1501-2200nm), and 0.0413 (2201-2500nm); (uncertainty listed is average of reflectance range from 0.00 to 0.99). The GlobalSat BU-353S4 USB GPS Receiver has a horizontal accuracy of about 12 m. Any use of trade, firm, or product names is for descriptive purposes only and does not imply endorsement by the U.S. Government. The dataset is considered complete for the information presented, as described in the abstract. Users are advised to read all metadata of the record carefully for additional details. The dataset is considered complete for the information presented, as described in the abstract. Users are advised to read all metadata of the record carefully for additional details. Single Spectrometer Data Processing Steps. Field spectral data were collected in Digital Numbers (DN) using the RS3 version 6.4.0 software from Malvern Panalytical and stored to a laptop connected to the spectrometer. During the field data collection, panels of known reflectance were measured with the spectrometer periodically. These panels were calibrated at the University of Arizona, College of Optical Sciences, Bidirectional Reflectance Distribution Function (BRDF) facility. Spectral measurements of the natural target were taken as transects between the measurements of the reference panels. Natural target spectral data was tagged for location with an autonomous grade Global Positioning System (GPS) device connected to the laptop during data collection. DNs were converted to radiance values with Malvern Panalytical’s ViewSpec Pro version 6.2.0 software. The reference panel data were interpolated between each panel measurement, creating an estimated reference panel measurement for each spectrometer measurement of the natural target. Surface reflectance values for each spectrum were calculated by taking the ratio of the radiance of the natural target and the radiance of the interpolated reference measurement of the target and multiplying the ratio by the calibration coefficient. 20260109 Dual Spectrometer Processing Steps. The dual spectrometer approach utilizes two field spectrometers, a mobile unit (MU) and a fixed base unit (FBU). Field spectral data were collected in DNs using the RS3 version 6.4.0 software from Malvern Panalytical and stored to a laptop connected to the spectrometer for both the MU and FBU. During the field data collection, panels of known reflectance were measured with the spectrometer periodically with the MU while the FBU continuously measured a panel of known reflectance. These panels were calibrated at the University of Arizona, College of Optical Sciences, BRDF facility. Spectral measurements of the natural target were taken as transects between the measurements of the reference panels. Spectral measurements of the natural target were taken as transects between the measurements of the reference panels with the MU. Natural target spectral data was tagged for location with an autonomous grade Global Positioning System (GPS) device connected to the MU laptop during data collection. DNs were converted to radiance values with Malvern Panalytical’s ViewSpec Pro version 6.2.0 software for both the MU and FBU. Data collected with the MU included measurements of the reference panel that the FBU was monitoring, as well as measurements of the MU reflectance panel and the natural target. The coincident measurements taken by the MU and FBU of the FBU reference panel were used to establish the initial reflectance calibration gain of both the MU and FBU. This was calculated by taking the ratio of the FBU panel reflectance and radiance measured by both the MU and FBU. The MU reflectance calibration gain was updated continuously for the measurements of the natural target using the FBU measurements. First the radiance collected by the MU was adjusted by multiplying the radiance by the ratio of the FBU radiance at a given time and the FBU radiance at the first coincident measurement of the FBU reference panel. The reflectance calibration gain of the MU was then calculated/updated by taking the ratio of the FBU reflectance and the adjusted MU radiance. The surface reflectance of the natural target was then determined by multiplying the radiance of the natural target by the updated reflectance calibration gain. 20260109 Vector Point 0.00000167 0.00000167 Decimal degrees WGS84 WGS84 6378137.0 298.257223563 WGS84 0.1 meters Explicit elevation coordinate included with horizontal coordinates 2025-03-12_ECCOE-EROS-GVR-Site_Single.csv Field collection data using the single spectroradiometer methodology. Please refer to the Data Dictionary for details on the formatting of the file. Producer Defined 2025-03-12_ECCOE-EROS-GVR-Site_Dual.csv Field collection data using the dual spectroradiometer methodology. Please refer to the Data Dictionary for details on the formatting of the file. Producer Defined 2025-04-08_ECCOE-EROS-GVR-Site_Single_1700.csv Field collection data using the single spectroradiometer methodology. Please refer to the Data Dictionary for details on the formatting of the file. Producer Defined 2025-04-08_ECCOE-EROS-GVR-Site_Dual_1700.csv Field collection data using the dual spectroradiometer methodology. Please refer to the Data Dictionary for details on the formatting of the file. Producer Defined 2025-04-08_ECCOE-EROS-GVR-Site_Single_1800.csv Field collection data using the single spectroradiometer methodology. Please refer to the Data Dictionary for details on the formatting of the file. Producer Defined 2025-04-08_ECCOE-EROS-GVR-Site_Dual_1800.csv Field collection data using the dual spectroradiometer methodology. Please refer to the Data Dictionary for details on the formatting of the file. Producer Defined 2025-04-16_ECCOE-EROS-GVR-Site_Single_1700.csv Field collection data using the single spectroradiometer methodology. Please refer to the Data Dictionary for details on the formatting of the file. Producer Defined 2025-04-16_ECCOE-EROS-GVR-Site_Dual_1700.csv Field collection data using the dual spectroradiometer methodology. Please refer to the Data Dictionary for details on the formatting of the file. Producer Defined 2025-04-16_ECCOE-EROS-GVR-Site_Single_1800.csv Field collection data using the single spectroradiometer methodology. Please refer to the Data Dictionary for details on the formatting of the file. Producer Defined 2025-04-16_ECCOE-EROS-GVR-Site_Dual_1800.csv Field collection data using the dual spectroradiometer methodology. Please refer to the Data Dictionary for details on the formatting of the file. Producer Defined 2025-04-21_ECCOE-EROS-GVR-Site_Single.csv Field collection data using the single spectroradiometer methodology. Please refer to the Data Dictionary for details on the formatting of the file. Producer Defined 2025-04-21_ECCOE-EROS-GVR-Site_Dual.csv Field collection data using the dual spectroradiometer methodology. Please refer to the Data Dictionary for details on the formatting of the file. Producer Defined 2025-05-06_ECCOE-EROS-GVR-Site_Single.csv Field collection data using the single spectroradiometer methodology. Please refer to the Data Dictionary for details on the formatting of the file. Producer Defined 2025-05-06_ECCOE-EROS-GVR-Site_Dual.csv Field collection data using the dual spectroradiometer methodology. Please refer to the Data Dictionary for details on the formatting of the file. Producer Defined 2025-05-10_ECCOE-EROS-GVR-Site_Single.csv Field collection data using the single spectroradiometer methodology. Please refer to the Data Dictionary for details on the formatting of the file. Producer Defined 2025-05-10_ECCOE-EROS-GVR-Site_Dual.csv Field collection data using the dual spectroradiometer methodology. Please refer to the Data Dictionary for details on the formatting of the file. Producer Defined 2025-06-10_ECCOE-EROS-GVR-Site_Single.csv Field collection data using the single spectroradiometer methodology. Please refer to the Data Dictionary for details on the formatting of the file. Producer Defined 2025-06-10_ECCOE-EROS-GVR-Site_Dual.csv Field collection data using the dual spectroradiometer methodology. Please refer to the Data Dictionary for details on the formatting of the file. Producer Defined 2025-06-20_ECCOE-EROS-GVR-Site_Single.csv Field collection data using the single spectroradiometer methodology. Please refer to the Data Dictionary for details on the formatting of the file. Producer Defined 2025-06-20_ECCOE-EROS-GVR-Site_Dual.csv Field collection data using the dual spectroradiometer methodology. Please refer to the Data Dictionary for details on the formatting of the file. Producer Defined 2025-06-27_ECCOE-EROS-GVR-Site_Single.csv Field collection data using the single spectroradiometer methodology. Please refer to the Data Dictionary for details on the formatting of the file. Producer Defined 2025-06-27_ECCOE-EROS-GVR-Site_Dual.csv Field collection data using the dual spectroradiometer methodology. Please refer to the Data Dictionary for details on the formatting of the file. Producer Defined 2025-06-30_ECCOE-EROS-GVR-Site_Single.csv Field collection data using the single spectroradiometer methodology. Please refer to the Data Dictionary for details on the formatting of the file. Producer Defined 2025-06-30_ECCOE-EROS-GVR-Site_Dual.csv Field collection data using the dual spectroradiometer methodology. Please refer to the Data Dictionary for details on the formatting of the file. Producer Defined 2025-07-10_ECCOE-EROS-GVR-Site_Single.csv Field collection data using the single spectroradiometer methodology. Please refer to the Data Dictionary for details on the formatting of the file. Producer Defined 2025-07-10_ECCOE-EROS-GVR-Site_Dual.csv Field collection data using the dual spectroradiometer methodology. Please refer to the Data Dictionary for details on the formatting of the file. Producer Defined 2025-07-13_ECCOE-EROS-GVR-Site_Single.csv Field collection data using the single spectroradiometer methodology. Please refer to the Data Dictionary for details on the formatting of the file. Producer Defined 2025-07-13_ECCOE-EROS-GVR-Site_Dual.csv Field collection data using the dual spectroradiometer methodology. Please refer to the Data Dictionary for details on the formatting of the file. Producer Defined 2025-08-21_ECCOE-EROS-GVR-Site_Single.csv Field collection data using the single spectroradiometer methodology. Please refer to the Data Dictionary for details on the formatting of the file. Producer Defined 2025-08-21_ECCOE-EROS-GVR-Site_Dual.csv Field collection data using the dual spectroradiometer methodology. Please refer to the Data Dictionary for details on the formatting of the file. Producer Defined 2025-09-15_ECCOE-EROS-GVR-Site_Single.csv Field collection data using the single spectroradiometer methodology. Please refer to the Data Dictionary for details on the formatting of the file. Producer Defined 2025-09-15_ECCOE-EROS-GVR-Site_Dual.csv Field collection data using the dual spectroradiometer methodology. Please refer to the Data Dictionary for details on the formatting of the file. Producer Defined 2025-09-26_ECCOE-EROS-GVR-Site_Single_1500.csv Field collection data using the single spectroradiometer methodology. Please refer to the Data Dictionary for details on the formatting of the file. Producer Defined 2025-09-26_ECCOE-EROS-GVR-Site_Dual_1500.csv Field collection data using the dual spectroradiometer methodology. Please refer to the Data Dictionary for details on the formatting of the file. Producer Defined 2025-09-26_ECCOE-EROS-GVR-Site_Single_1600.csv Field collection data using the single spectroradiometer methodology. Please refer to the Data Dictionary for details on the formatting of the file. Producer Defined 2025-09-26_ECCOE-EROS-GVR-Site_Dual_1600.csv Field collection data using the dual spectroradiometer methodology. Please refer to the Data Dictionary for details on the formatting of the file. Producer Defined 2025-09-26_ECCOE-EROS-GVR-Site_Single_1700.csv Field collection data using the single spectroradiometer methodology. Please refer to the Data Dictionary for details on the formatting of the file. Producer Defined 2025-09-26_ECCOE-EROS-GVR-Site_Dual_1700.csv Field collection data using the dual spectroradiometer methodology. Please refer to the Data Dictionary for details on the formatting of the file. Producer Defined 2025-09-26_ECCOE-EROS-GVR-Site_Single_1800.csv Field collection data using the single spectroradiometer methodology. Please refer to the Data Dictionary for details on the formatting of the file. Producer Defined 2025-09-26_ECCOE-EROS-GVR-Site_Dual_1800.csv Field collection data using the dual spectroradiometer methodology. Please refer to the Data Dictionary for details on the formatting of the file. Producer Defined 2025-09-26_ECCOE-EROS-GVR-Site_Single_1900.csv Field collection data using the single spectroradiometer methodology. Please refer to the Data Dictionary for details on the formatting of the file. Producer Defined 2025-09-26_ECCOE-EROS-GVR-Site_Dual_1900.csv Field collection data using the dual spectroradiometer methodology. Please refer to the Data Dictionary for details on the formatting of the file. Producer Defined 2025-03-12_ECCOE-EROS-GVR-Site_Single.gpkg Standardized GeoPackage database containing the field data in a vector format for the specified date and site. Please refer to the Data Dictionary for details on the formatting of the file. Producer Defined 2025-03-12_ECCOE-EROS-GVR-Site_Dual.gpkg Standardized GeoPackage database containing the field data in a vector format for the specified date and site. Please refer to the Data Dictionary for details on the formatting of the file. Producer Defined 2025-04-08_ECCOE-EROS-GVR-Site_Single_1700.gpkg Standardized GeoPackage database containing the field data in a vector format for the specified date and site. Please refer to the Data Dictionary for details on the formatting of the file. Producer Defined 2025-04-08_ECCOE-EROS-GVR-Site_Dual_1700.gpkg Standardized GeoPackage database containing the field data in a vector format for the specified date and site. Please refer to the Data Dictionary for details on the formatting of the file. Producer Defined 2025-04-08_ECCOE-EROS-GVR-Site_Single_1800.gpkg Standardized GeoPackage database containing the field data in a vector format for the specified date and site. Please refer to the Data Dictionary for details on the formatting of the file. Producer Defined 2025-04-08_ECCOE-EROS-GVR-Site_Dual_1800.gpkg Standardized GeoPackage database containing the field data in a vector format for the specified date and site. Please refer to the Data Dictionary for details on the formatting of the file. Producer Defined 2025-04-16_ECCOE-EROS-GVR-Site_Single_1700.gpkg Standardized GeoPackage database containing the field data in a vector format for the specified date and site. Please refer to the Data Dictionary for details on the formatting of the file. Producer Defined 2025-04-16_ECCOE-EROS-GVR-Site_Dual_1700.gpkg Standardized GeoPackage database containing the field data in a vector format for the specified date and site. Please refer to the Data Dictionary for details on the formatting of the file. Producer Defined 2025-04-16_ECCOE-EROS-GVR-Site_Single_1800.gpkg Standardized GeoPackage database containing the field data in a vector format for the specified date and site. Please refer to the Data Dictionary for details on the formatting of the file. Producer Defined 2025-04-16_ECCOE-EROS-GVR-Site_Dual_1800.gpkg Standardized GeoPackage database containing the field data in a vector format for the specified date and site. Please refer to the Data Dictionary for details on the formatting of the file. Producer Defined 2025-04-21_ECCOE-EROS-GVR-Site_Single.gpkg Standardized GeoPackage database containing the field data in a vector format for the specified date and site. Please refer to the Data Dictionary for details on the formatting of the file. Producer Defined 2025-04-21_ECCOE-EROS-GVR-Site_Dual.gpkg Standardized GeoPackage database containing the field data in a vector format for the specified date and site. Please refer to the Data Dictionary for details on the formatting of the file. Producer Defined 2025-05-06_ECCOE-EROS-GVR-Site_Single.gpkg Standardized GeoPackage database containing the field data in a vector format for the specified date and site. Please refer to the Data Dictionary for details on the formatting of the file. Producer Defined 2025-05-06_ECCOE-EROS-GVR-Site_Dual.gpkg Standardized GeoPackage database containing the field data in a vector format for the specified date and site. Please refer to the Data Dictionary for details on the formatting of the file. Producer Defined 2025-05-10_ECCOE-EROS-GVR-Site_Single.gpkg Standardized GeoPackage database containing the field data in a vector format for the specified date and site. Please refer to the Data Dictionary for details on the formatting of the file. Producer Defined 2025-05-10_ECCOE-EROS-GVR-Site_Dual.gpkg Standardized GeoPackage database containing the field data in a vector format for the specified date and site. Please refer to the Data Dictionary for details on the formatting of the file. Producer Defined 2025-06-10_ECCOE-EROS-GVR-Site_Single.gpkg Standardized GeoPackage database containing the field data in a vector format for the specified date and site. Please refer to the Data Dictionary for details on the formatting of the file. Producer Defined 2025-06-10_ECCOE-EROS-GVR-Site_Dual.gpkg Standardized GeoPackage database containing the field data in a vector format for the specified date and site. Please refer to the Data Dictionary for details on the formatting of the file. Producer Defined 2025-06-20_ECCOE-EROS-GVR-Site_Single.gpkg Standardized GeoPackage database containing the field data in a vector format for the specified date and site. Please refer to the Data Dictionary for details on the formatting of the file. Producer Defined 2025-06-20_ECCOE-EROS-GVR-Site_Dual.gpkg Standardized GeoPackage database containing the field data in a vector format for the specified date and site. Please refer to the Data Dictionary for details on the formatting of the file. Producer Defined 2025-06-27_ECCOE-EROS-GVR-Site_Single.gpkg Standardized GeoPackage database containing the field data in a vector format for the specified date and site. Please refer to the Data Dictionary for details on the formatting of the file. Producer Defined 2025-06-27_ECCOE-EROS-GVR-Site_Dual.gpkg Standardized GeoPackage database containing the field data in a vector format for the specified date and site. Please refer to the Data Dictionary for details on the formatting of the file. Producer Defined 2025-06-30_ECCOE-EROS-GVR-Site_Single.gpkg Standardized GeoPackage database containing the field data in a vector format for the specified date and site. Please refer to the Data Dictionary for details on the formatting of the file. Producer Defined 2025-06-30_ECCOE-EROS-GVR-Site_Dual.gpkg Standardized GeoPackage database containing the field data in a vector format for the specified date and site. Please refer to the Data Dictionary for details on the formatting of the file. Producer Defined 2025-07-10_ECCOE-EROS-GVR-Site_Single.gpkg Standardized GeoPackage database containing the field data in a vector format for the specified date and site. Please refer to the Data Dictionary for details on the formatting of the file. Producer Defined 2025-07-10_ECCOE-EROS-GVR-Site_Dual.gpkg Standardized GeoPackage database containing the field data in a vector format for the specified date and site. Please refer to the Data Dictionary for details on the formatting of the file. Producer Defined 2025-07-13_ECCOE-EROS-GVR-Site_Single.gpkg Standardized GeoPackage database containing the field data in a vector format for the specified date and site. Please refer to the Data Dictionary for details on the formatting of the file. Producer Defined 2025-07-13_ECCOE-EROS-GVR-Site_Dual.gpkg Standardized GeoPackage database containing the field data in a vector format for the specified date and site. Please refer to the Data Dictionary for details on the formatting of the file. Producer Defined 2025-08-21_ECCOE-EROS-GVR-Site_Single.gpkg Standardized GeoPackage database containing the field data in a vector format for the specified date and site. Please refer to the Data Dictionary for details on the formatting of the file. Producer Defined 2025-08-21_ECCOE-EROS-GVR-Site_Dual.gpkg Standardized GeoPackage database containing the field data in a vector format for the specified date and site. Please refer to the Data Dictionary for details on the formatting of the file. Producer Defined 2025-09-15_ECCOE-EROS-GVR-Site_Single.gpkg Standardized GeoPackage database containing the field data in a vector format for the specified date and site. Please refer to the Data Dictionary for details on the formatting of the file. Producer Defined 2025-09-15_ECCOE-EROS-GVR-Site_Dual.gpkg Standardized GeoPackage database containing the field data in a vector format for the specified date and site. Please refer to the Data Dictionary for details on the formatting of the file. Producer Defined 2025-09-26_ECCOE-EROS-GVR-Site_Single_1500.gpkg Standardized GeoPackage database containing the field data in a vector format for the specified date and site. Please refer to the Data Dictionary for details on the formatting of the file. Producer Defined 2025-09-26_ECCOE-EROS-GVR-Site_Dual_1500.gpkg Standardized GeoPackage database containing the field data in a vector format for the specified date and site. Please refer to the Data Dictionary for details on the formatting of the file. Producer Defined 2025-09-26_ECCOE-EROS-GVR-Site_Single_1600.gpkg Standardized GeoPackage database containing the field data in a vector format for the specified date and site. Please refer to the Data Dictionary for details on the formatting of the file. Producer Defined 2025-09-26_ECCOE-EROS-GVR-Site_Dual_1600.gpkg Standardized GeoPackage database containing the field data in a vector format for the specified date and site. Please refer to the Data Dictionary for details on the formatting of the file. Producer Defined 2025-09-26_ECCOE-EROS-GVR-Site_Single_1700.gpkg Standardized GeoPackage database containing the field data in a vector format for the specified date and site. Please refer to the Data Dictionary for details on the formatting of the file. Producer Defined 2025-09-26_ECCOE-EROS-GVR-Site_Dual_1700.gpkg Standardized GeoPackage database containing the field data in a vector format for the specified date and site. Please refer to the Data Dictionary for details on the formatting of the file. Producer Defined 2025-09-26_ECCOE-EROS-GVR-Site_Single_1800.gpkg Standardized GeoPackage database containing the field data in a vector format for the specified date and site. Please refer to the Data Dictionary for details on the formatting of the file. Producer Defined 2025-09-26_ECCOE-EROS-GVR-Site_Dual_1800.gpkg Standardized GeoPackage database containing the field data in a vector format for the specified date and site. Please refer to the Data Dictionary for details on the formatting of the file. Producer Defined 2025-09-26_ECCOE-EROS-GVR-Site_Single_1900.gpkg Standardized GeoPackage database containing the field data in a vector format for the specified date and site. Please refer to the Data Dictionary for details on the formatting of the file. Producer Defined 2025-09-26_ECCOE-EROS-GVR-Site_Dual_1900.gpkg Standardized GeoPackage database containing the field data in a vector format for the specified date and site. Please refer to the Data Dictionary for details on the formatting of the file. Producer Defined Each standard field campaign is associated with csv and GeoPackage files containing the time, latitude, longitude, elevation, and surface reflectance at each wavelength for each data point collected during a field campaign. Data points are separated by rows within the files. Column descriptions are provided in the Data Dictionary. Kropuenske, T.J., Irwin, J.R., Shrestha, M., Gross, G., and Mann, J.D., 2026, ECCOE 2025 Surface Reflectance Validation Dataset: U.S. Geological Survey data release, https://doi.org/10.5066/P13MCGPC U.S. Geological Survey GS ScienceBase mailing address

Denver Federal Center, Building 810, Mail Stop 302

Denver CO 80225 United States 1-888-275-8747 sciencebase@usgs.gov Unless otherwise stated, all data, metadata and related materials are considered to satisfy the quality standards relative to the purpose for which the data were collected. Although these data and associated metadata have been reviewed for accuracy and completeness and approved for release by the U.S. Geological Survey (USGS), no warranty expressed or implied is made regarding the display or utility of the data on any other system or for general or scientific purposes, nor shall the act of distribution constitute any such warranty. Digital Data https://doi.org/10.5066/P13MCGPC None 20260224 USGS EROS Center Customer Service Representative mailing and physical

47914 252nd St

Sioux Falls SD 57198-001 United States 1-800-252-4547 605-594-6589 custserv@usgs.gov FGDC Content Standard for Digital Geospatial Metadata FGDC-STD-001-1998