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Sample Reference Data for Global Cropland Analysis 2000-2019

 

Sample map and reference data: https://glad.geog.umd.edu/Potapov/Global_Crop/reference_sample_data.csv

Map data provided for each sample and each four-year interval (2000-2003, 2004-2007, 2008-2011, 2012-2015, and 2016-2019) referred to by the last year of the interval (2003, ... ,2019). Map values: 1 - crop detected, 0 - no crop detection.

Reference data based on visual image interpretation. Reference categories:

  • SC - stable crop (crop observed in 2000-2003 and 2016-2019)
  • SNC - stable non-crop
  • CG - crop gain (crop established after year 2000)
  • CL - crop loss (crop observed in 2000-2003, and was converted to other land use by 2019)

Sample analysis was performed separately by seven regions selected as population of the 1×1° Landsat ARD tiles within continents and national boundaries. The to access sample data, use the link to a specific region:

Africa [AFR]: https://glad.geog.umd.edu/Potapov/Global_Crop/AFR/AFR_index.html

Middle East, Central Asia, and South Asia [ASIA]: https://glad.geog.umd.edu/Potapov/Global_Crop/ASIA/ASIA_index.html

Australia and New Zealand [AUS]: https://glad.geog.umd.edu/Potapov/Global_Crop/AUS/AUS_index.html

East and Southeast Asia [EASIA]: https://glad.geog.umd.edu/Potapov/Global_Crop/EASIA/EASIA_index.html

Europe and North Asia [EUR]: https://glad.geog.umd.edu/Potapov/Global_Crop/EUR/EUR_index.html

North and Central America [NAM]: https://glad.geog.umd.edu/Potapov/Global_Crop/NAM/NAM_index.html

South America [SAM]: https://glad.geog.umd.edu/Potapov/Global_Crop/SAM/SAM_index.html

Sample data interface description:

A - the sample Region and ID.

B - the link to Google Earth interface (provides sample outline).

C - Landsat ARD 16-day clear-sky NDVI and shortwave infrared band (1.6 µm) normalized surface reflectance for the sample pixel. NDVI value (-1 to 1) scaled to the range 0-2, and reflectance (0 to 1) scaled to range 1-3.

D - Landsat interquartile means for each time interval (2000-2003, 2004-2007, 2008-2011, 2012-2015, 2016-2019). Band combination SWIR (1.6 µm) / NIR/ Red.

E - Landsat maximum NDVI composite for each time interval, band combination NIR / SWIR SWIR (1.6 µm) / SWIR (2.2 µm).

F - Landsat snow-free season amplitude, band combination NIR / SWIR (2.2 µm) / NDVI. In each Landsat each composite, D-F, selected sample pixel outlined in red.