US-GL2: Granite Island

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Use the information below for citation of this site. See the Data Policy page for more details.

DOI(s) for citing US-GL2 data

Data Use Policy: AmeriFlux CC-BY-4.0 License

This site’s data can also be used under the more restrictive AmeriFlux Legacy Policy.
The AmeriFlux Legacy Policy must be followed if US-GL2 data are combined with data from sites that require the AmeriFlux Legacy Policy.

AmeriFlux BASE: https://doi.org/10.17190/AMF/2574377
Citation: John Lenters (2025), AmeriFlux BASE US-GL2 Granite Island, Ver. 1-5, AmeriFlux AMP, (Dataset). https://doi.org/10.17190/AMF/2574377

To cite BADM when downloaded on their own, use the publications below for citing site characterization. When using BADM that are downloaded with AmeriFlux BASE and AmeriFlux FLUXNET products, use the DOI citation for the associated data product.

Publication(s) for citing site characterization

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Acknowledgments

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US-GL2: Granite Island

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This page displays the list of downloads of data for the site {{siteId}}.

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US-GL2: Granite Island

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Search Images for this Site Images found : 3

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Flux station
Keywords: —
**Credit:** John Lenters
**Site ID:** US-GL2
**Location:** Michigan, United States
**Image Date:** 2024/09/27
**Journal:** —
**Article Title:** —
**Copyright Permissions:** Contact owner
**Right to Use:** As long as credit is given

View in Original Size
To download, right-click photo (Mac: control-click) and choose Save Image As

Granite Island Light Station
Keywords: —
**Credit:** John Lenters
**Site ID:** US-GL2
**Location:** Michigan, United States
**Image Date:** 2024/08/21
**Journal:** —
**Article Title:** —
**Copyright Permissions:** Contact owner
**Right to Use:** As long as credit is given

View in Original Size
To download, right-click photo (Mac: control-click) and choose Save Image As

Flux tower
Keywords: —
**Credit:** John Lenters
**Site ID:** US-GL2
**Location:** Michigan, United States
**Image Date:** 2024/09/27
**Journal:** —
**Article Title:** —
**Copyright Permissions:** Contact owner
**Right to Use:** As long as credit is given

View in Original Size
To download, right-click photo (Mac: control-click) and choose Save Image As

US-GL2: Granite Island

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MODIS NDVI

The time series shows the 16-day Normalized Difference Vegetation Index (NDVI) average from the MOD13Q1 data product.
Use the slider below the time series to zoom in and out.

Includes all pixels that have acceptable quality

To view / download these data and other MOD13Q1 products for this site, visit MODIS/Terra Vegetation Indices.

For other related products, visit MODIS/VIIRS Fixed Sites Subsets Tool.

Citation:

ORNL DAAC. 2018. Terrestrial Ecology Subsetting & Visualization Services (TESViS) Fixed Sites Subsets. ORNL DAAC, Oak Ridge, Tennessee, USA. https://doi.org/10.3334/ORNLDAAC/1567

Read more on how to cite these MODIS products. Data come from NASA’s MODIS instruments installed on satellites Terra and Aqua, which scan the entire Earth’s surface every one to two days.

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For a complete list of AmeriFlux sites, visit ORNL DAAC's MODIS/VIIRS Fixed Sites Subsets Tool.

PhenoCam Images and Derived Time Series Data

PhenoCams are high-resolution digital cameras that take repeated images of studied ecosystems and provide quantitative information about the canopy phenology. The PhenoCam Network coordinates the camera installation and data reporting/analyses across sites in the Americas, providing automated, near-surface remote sensing of canopy phenology across a range of ecosystems and climate zones. Use of PhenoCam images / data should follow the PhenoCam Data Use Policy .

No PhenoCam data for this site

GeoNEX Data Products

GeoNEX led by NASA Earth eXchange (NEX) is a collaborative effort for generating Earth monitoring products from the new generation of geostationary satellite sensors. GeoNEX has produced a suite of geostationary data products including surface reflectance, land surface temperature, surface solar radiation, and many others.

The GeoNEX Common Grid locates GeoNEX data in the geographic (latitude/longitude) projection. Pixels (grid cells) are created at regular 0.005°, 0.01°, and 0.02° resolutions.

GeoNEX pixels below cover the area 0.06° x 0.06° around and including site .

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NDVI: Normalized Difference Vegetation Index

Resolution: 0.01° x 0.01° & 10 minutes

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NIRv Near-Infrared Reflectance of vegetation

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DSR: Surface downward shortwave radiation

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LST: Land Surface Temperature

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Citation

This material can be used without obtaining permission from NASA. NASA should be acknowledged as the source of this material.

Subset Data Citation:

Hashimoto, H., Wang, W., Park, T., Khajehei, S., Ichii, K., Michaelis, A.R., Guzman, A., Nemani, R.R., Torn, M., Yi, K., Brosnan, I.G. (in preparation). Subsets of geostationary satellite data over international observing network sites for studying the diurnal dynamics of energy, carbon, and water cycles.

Relevant Science Publication Citation:

GeoNEX Surface Reflectance for Vegetation Indices (NDVI & NIRv)

Wang, W., Wang, Y., Lyapustin, A., Hashimoto, H., Park, T., Michaelis, A., & Nemani, R. (2022). A novel atmospheric correction algorithm to exploit the diurnal variability in hypertemporal geostationary observations. Remote Sensing, 14(4), 964.

GeoNEX Surface Downward Solar Radiation (DSR):

Li, R., Wang, D., Wang, W., & Nemani, R. (2023). A GeoNEX-based high-spatiotemporal-resolution product of land surface downward shortwave radiation and photosynthetically active radiation. Earth System Science Data, 15(3), 1419-1436.

GeoNEX Land Surface Temperature (LST):

Jia, A., Liang, S., & Wang, D. (2022). Generating a 2-km, all-sky, hourly land surface temperature product from Advanced Baseline Imager data. Remote Sensing of Environment, 278, 113105.

US-GL2: Granite Island

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Search Publications for this Site Publications Found: 0

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US-GL2: Granite Island

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BADM for This Site

Access the Biological, Ancillary, Disturbance and Metadata (BADM) information and data for this site.

BADM contain information for many uses, such as characterizing a site’s vegetation and soil, describing disturbance history, and defining instrumentation for flux processing. They complement the flux/met data.

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US-GL2: Granite Island

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Tower_team:
PI:	John Lenters jlenters@umich.edu - University of Michigan Biological Station
AncContact:	Chris Spence chris.spence@ec.gc.ca - Environment and Climate Change Canada
AncContact:	Peter Blanken Blanken@Colorado.EDU - University of Colorado-Boulder
Lat, Long:	46.7167, -87.4000
Elevation(m):	183
Network Affiliations:	AmeriFlux
Vegetation IGBP:	WAT (Water Bodies : Oceans, seas, lakes, reservoirs, and rivers. Can be either fresh or salt- water bodies.)
Climate Koeppen:	Dfb (Warm Summer Continental: significant precipitation in all seasons )
Mean Annual Temp (°C):	6.6
Mean Annual Precip. (mm):	762
Flux Species Measured:	H, H2O, CO2
Years Data Collected:	2010 - Present
Years Data Available:	AmeriFlux BASE 2024 - 2025 Data Citation
Data Use Policy:	AmeriFlux CC-BY-4.0 Policy¹
Description:	Granite Island is a small island on Lake Superior approximately 10 miles due north of Marquette, Michigan. It is roughly 6.5 miles from shore and is occupied ... Granite Island is a small island on Lake Superior approximately 10 miles due north of Marquette, Michigan. It is roughly 6.5 miles from shore and is occupied by a lighthouse, bell tower, Coast Guard light tower, and other small structures. A flux tower to measure H, LE, and meteorological data was installed atop the bell tower in July of 2009 and has been in continuous operation since then (aside from occasional power outages or other sources of data loss). CO2 measurements were added to the flux tower in October of 2010. See More Show Less
URL:	https://superiorwatersheds.org/GLEN/GraniteIsland.htm
Research Topics:	The primary goal of this and other flux sites on the Great Lakes is to quantify lake evaporation as part of the Great Lakes Evaporation Network (GLEN). ... The primary goal of this and other flux sites on the Great Lakes is to quantify lake evaporation as part of the Great Lakes Evaporation Network (GLEN). Granite Island is the second GLEN site to be added to the AmeriFlux network, with the first one being US-GL1 at Stannard Rock lighthouse (also on Lake Superior). See More Show Less
Acknowledgment:	Data collected at this site is the culmination of the hard work and contributions of numerous individuals, institutions, and funding sources. The principal investigator (John Lenters, University of Michigan) thanks Scott Holman (land owner) for the generous use of Granite Island, along with Mike Smith and Northern Michigan University for power and internet support, as well as student contributions. Funding sources include the Great Lakes Observing System (GLOS), Northern Michigan University, the University of Nebraska-Lincoln, and LimnoTech. Additional GLEN investigators include Peter Blanken, Chris Spence, Newell Hedstrom, and Erin Nicholls. Lenters also thanks Dan Chiconsky, the Michigan DNR, US Coast Guard, and Jon Billman for logistical support and boat access.

US-GL2: Granite Island

US-GL2: Granite Island

DOI(s) for citing US-GL2 data

Publication(s) for citing site characterization

Acknowledgments

Resources

US-GL2: Granite Island

Not Found

US-GL2: Granite Island

Flux station

Granite Island Light Station

Flux tower

US-GL2: Granite Island

US-GL2: Granite Island

BADM for This Site

US-GL2: Granite Island

No wind rose data is available at this time.