Overall Method Design for NLCD 2016: 2001-2016 Land Cover and Land Cover Change
Abstract
National Land Cover Database (NLCD) 2016 is a sustained effort to develop and deliver an accurate and consistent land cover and land cover change database of the conterminous United States from 2001 to 2016 at a 2-3-year interval. To meet the growing demand for longer duration, more accurate, and consistent land cover and its change information, we have designed new strategies and developed comprehensive methods, models, and procedures for NLCD 2016 implementation. The developed procedures consist of data preparation, land cover change detection and classification, sophisticated theme-based postprocessing, and final integration to produce a suite of NLCD 2016 products. Data preparation includes not only Landsat imagery selection, cloud detection, and cloud filling, but also compilation and creation of more than 30 national scale ancillary datasets. Land cover change detection includes single-date water and snow/ice detection algorithms and models, two-date multi-index integrated change detection models, and long-term multi-date change algorithms and models. We also leveraged ancillary data to extend a disturbance change-date product back to 1986. Land cover classification process includes 7-date training data creation, 14-run classifications, and an initial integration prior to formal postprocessing. We innovatively created training data for change and no-change areas based on integrated information from ancillary data, change-detection results, Landsat spectral and temporal information, and knowledge-based trajectory analysis. For land cover classification, we creatively integrated temporal, spectral, object-based, topographic, and ancillary information to obtain an optimized land cover map for each-date. For postprocessing, we developed comprehensive models for each land cover theme in a hierarchical order to ensure the spatial and temporal coherence of land cover and land cover changes over 15 years. In total, over 120 models were developed for NLCD 2016 operation, which is scheduled to produce and release a suite of datasets related to land cover and land cover change for the nation by the end of 2018.
- Publication:
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AGU Fall Meeting Abstracts
- Pub Date:
- December 2018
- Bibcode:
- 2018AGUFM.B21C..05J
- Keywords:
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- 0439 Ecosystems;
- structure and dynamics;
- BIOGEOSCIENCESDE: 0480 Remote sensing;
- BIOGEOSCIENCESDE: 1632 Land cover change;
- GLOBAL CHANGEDE: 1807 Climate impacts;
- HYDROLOGY