NLCD: USGS National Land Cover Database (USGS/NLCD)
NLCD (the National Land Cover Database) is a 30-m Landsat-based land cover
database spanning 4 epochs (1992, 2001, 2006 and 2011). 1992 data are
primarily based on unsupervised classification of Landsat data, while the
rest of the images rely on the imperviousness data layer for the urban
classes and on a decision-tree classification for the rest.
This dataset has one image for the continental US for each of the
four epochs, plus a separate image for Alaska in 2011. (It could not be
merged in due to having a different projection from the continental US
images.)
Note that the impervious layers and tree cover layers for Alaska 2011
only have data for parts of Alaska. For the impervious layer, only the
parts of Kenai Peninsula Borough and Anchorage Municipality are available.
Tree cover is only available on a strip along the coast from the southern
tip of the Alaskan Panhandle up through the Kenai Peninsula, plus Kodiak
Island.
NLCD products are created by the Multi-Resolution Land Characteristics
(MRLC) Consortium, a partnership of federal agencies led by the
U.S. Geological Survey.
| Name | Description |
|---|---|
| landcover | All images include a landcover classification scheme. NLCD2001, NLCD2006, NLCD2011, and NLCD2011_AK share the same land cover classification scheme described in the [2011 Product Legend](https://www.mrlc.gov/nlcd11_leg.php). The classification scheme for NLCD1992 differs slightly and is available in the [1992 Product Legend](https://www.mrlc.gov/nlcd92_leg.php). The legends are also available as metadata on each image. The classes in the 2011 product legend are given below. |
| impervious | Percent of the pixel covered by developed impervious surface. Included in images NLCD2001, NLCD2006, and NLCD2011. |
| percent_tree_cover | Percent of the pixel that's covered by tree canopy. No masking of obvious non-tree areas is performed for this product. Included in images NLCD2001 and NLCD2011. |
| percent_tree_error | Standard error for the model as a percentage from 0 to 45. The higher the value, the greater the model uncertainty in estimating the canopy value for that cell. Included in NLCD2011. |
Providers | |
|---|---|
| USGS (producer, licensor) | |
| Google Earth Engine (host) | |
| STAC Version | 0.6.2 |
| Keywords | landcover, mrlc, nlcd, usgs |
| License | proprietary |
| Temporal Extent | 12/31/1991, 4:00:00 PM - 12/31/2011, 4:00:00 PM |
| Citation | Homer, C.G., Dewitz, J.A., Yang, L., Jin, S., Danielson, P., Xian, G., Coulston, J., Herold, N.D., Wickham, J.D., and Megown, K., 2015, [Completion of the 2011 National Land Cover Database for the conterminous United States-Representing a decade of land cover change information] (http://www.asprs.org/a/publications/pers/2015journals/PERS_May_2015/HTML/files/assets/basic-html/index.html#345/z#noFlash). Photogrammetric Engineering and Remote Sensing, v. 81, no. 5, p. 345-354 |
| Type | image_collection |
| GSD | metersm |
| cube:dimensions | {"x":{"type":"spatial","axis":"x","extent":[-130.24,-63.66]},"y":{"type":"spatial","axis":"y","extent":[21.75,57.68]},"temporal":{"type":"temporal","extent":["1992-01-01T00:00:00Z","2012-01-01T00:00:00Z"]},"bands":{"type":"bands","values":["landcover","impervious","percent_tree_cover","percent_tree_error"]}} |