USGS EROS Archive – Land Cover – Annual NLCD Collection 1 Spectral Change Day of Year
The Spectral Change product provides the day-of-year (DOY) on which a significant deviation in surface reflectance was detected within the calendar year of the map product. Spectral changes represent abrupt non-phenological changes in the reflectance of the land surface that may or may not be related to land cover change.
Annual NLCD Spectral Change Day of Year in the h04v01tile in the Northwest United States.
The surface reflectance that are used to calculate the spectral changes product respond to changes in the physical properties of the land surface, as measured in different wavelengths by one or more Landsat spectral bands. For example, a high intensity wildfire in a forested area produces both a substantial change in surface reflectance and a thematic class change within the NLCD land cover legend. Other changes, such as those produced by drought or precipitation, may produce a significant change in vegetative greenness but still fall within the same land cover class. The value range 1-366 represents the day of year the spectral change occurred, with no change represented by 0.
Annual NLCD Collection 1 Product Suite products are processed to 30-meter resolution on an Albers Equal Area Conic (AEA) projection using the World Geodetic System 1984 (WGS84) datum. Annual NLCD products are created as raster images stored as GeoTIFFs with accompanying metadata. The products delivered via EarthExplorer (EE) are Tiled products processed to a common tiling scheme of uniform dimensions bounded by static corner points in a defined grid system. Each tile contains 5,000 x 5,000 30-meter pixels.
See the Science Product User Guide for a discussion about the underlying spectral change detection algorithm.
Additional Information
- Annual National Land Cover Database
- Annual NLCD Science Product User Guide
- Annual NLCD Reference and Validation
- Accuracy Assessment Publication
Access Data
EarthExplorer (EE) can be used to search, preview, and download Annual NLCD Land Cover dataset. The collection is available under the Land Cover > Annual NLCD Product Suite category. The data provided via EE are Tiled products.
Annual NLCD Collection 1 Product Suite are also distributed by the MRLC Web Viewer, the MRLC Mosaic Download website, ScienceBase, as Annual NLCD web services, and through USGS AWS S3 (Oregon us-west-2 region). Each distribution site provides its own unique options for the products and services they provide.
Product Digital Object Identifier (DOI)#
Citation
Annual NLCD Product Suite Citation Information
Annual NLCD has no restrictions on the use of science products. Annual NLCD does ask that if you use the data as part of a publication or presentation that use the following citation below; however, it is not a requirement to use the data.
U.S. Geological Survey (USGS), 2024, Annual NLCD Collection 1 Science Products: U.S. Geological Survey data release, https://doi.org/10.5066/P94UXNTS
The Spectral Change product provides the day-of-year (DOY) on which a significant deviation in surface reflectance was detected within the calendar year of the map product. Spectral changes represent abrupt non-phenological changes in the reflectance of the land surface that may or may not be related to land cover change.
Annual NLCD Spectral Change Day of Year in the h04v01tile in the Northwest United States.
The surface reflectance that are used to calculate the spectral changes product respond to changes in the physical properties of the land surface, as measured in different wavelengths by one or more Landsat spectral bands. For example, a high intensity wildfire in a forested area produces both a substantial change in surface reflectance and a thematic class change within the NLCD land cover legend. Other changes, such as those produced by drought or precipitation, may produce a significant change in vegetative greenness but still fall within the same land cover class. The value range 1-366 represents the day of year the spectral change occurred, with no change represented by 0.
Annual NLCD Collection 1 Product Suite products are processed to 30-meter resolution on an Albers Equal Area Conic (AEA) projection using the World Geodetic System 1984 (WGS84) datum. Annual NLCD products are created as raster images stored as GeoTIFFs with accompanying metadata. The products delivered via EarthExplorer (EE) are Tiled products processed to a common tiling scheme of uniform dimensions bounded by static corner points in a defined grid system. Each tile contains 5,000 x 5,000 30-meter pixels.
See the Science Product User Guide for a discussion about the underlying spectral change detection algorithm.
Additional Information
- Annual National Land Cover Database
- Annual NLCD Science Product User Guide
- Annual NLCD Reference and Validation
- Accuracy Assessment Publication
Access Data
EarthExplorer (EE) can be used to search, preview, and download Annual NLCD Land Cover dataset. The collection is available under the Land Cover > Annual NLCD Product Suite category. The data provided via EE are Tiled products.
Annual NLCD Collection 1 Product Suite are also distributed by the MRLC Web Viewer, the MRLC Mosaic Download website, ScienceBase, as Annual NLCD web services, and through USGS AWS S3 (Oregon us-west-2 region). Each distribution site provides its own unique options for the products and services they provide.
Product Digital Object Identifier (DOI)#
Citation
Annual NLCD Product Suite Citation Information
Annual NLCD has no restrictions on the use of science products. Annual NLCD does ask that if you use the data as part of a publication or presentation that use the following citation below; however, it is not a requirement to use the data.
U.S. Geological Survey (USGS), 2024, Annual NLCD Collection 1 Science Products: U.S. Geological Survey data release, https://doi.org/10.5066/P94UXNTS