*************************************************************************************************************************************
A global open-source dataset of monthly irrigated and rainfed cropped areas (MIRCA-OS) for the 21st century version v0.1 June 2024
*************************************************************************************************************************************

************************************************************
CONTENTS

This dataset is an update of MIRCA2000. Utilizing a data library of subnational crop-specific irrigated and rainfed harvested area statistics combined with global gridded land cover products, we developed a global gridded (5-arcminute) irrigated and rainfed cropped area (MIRCA-OS) dataset for the years 2000 to 2015 for 23 crop classes.

Each annual and monthly gridded dataset is in standard raster format (GeoTIFF/NetCDF) with global coverage (180°E–180°W; 90°S–90°N) and a 5-arcminute (approximately 10km x 10km) spatial resolution using the WGS84 coordinate system. Additionally, we offer annual maps at a 0.5° (30-arcminutes) spatial resolution. The crop calendars for irrigated and rainfed crops from 2000 to 2015 are also available in CSV format.

This dataset, version 0.1, has been submitted for peer review in Nature Scientific Data and may be subject to change. 

************************************************************
CROP CALENDAR FOR 23 IRRIGATED AND RAINFED CROPS

Description: A crop calendar (CC) presents tabulated data compiled by combining agricultural statistics of various spatial units and their corresponding cropping calendars. Each entry in the CC includes the unit code, crop or sub-crop name, number of sub-crops, categorization (perennial, annual, fodder, or others), annual harvested area, and planting and maturity months. Separate crop calendars were prepared for irrigated and rainfed crops for 2000, 2005, 2010, and 2015.
File format: CSV
Period: 2000 to 2015
File name format: MIRCA-OS_year_system_version
Unit: harvested area (ha)
  - year: Signifies the data year (e.g., 2000, 2005, 2010, 2015)
  - system: Indicates whether the harvested area pertains to an irrigated ('ir') or rainfed ('rf') system
  - version: Represents the version of the dataset (e.g., v0.1)

************************************************************
MONTHLY GROWING AREA GRIDS (MHAG) FOR 23 IRRIGATED AND RAINFED CROPS

Description: This dataset presents monthly growing area grids for 23 irrigated and 23 rainfed crops, with a spatial resolution of 5 arcminutes, for the years 2000, 2005, 2010, and 2015. It depicts the growing area of each crop per spatial unit within a grid cell from planting to maturity month.
File format: NetCDF
File name format: MIRCA-OS_Crop_subcrop_year_system_version
  - crop: Denotes the crop name
  - subcrop: Indicates multiple cropping, with a numerical value assigned to each subcrop following the crop name (e.g., 'Rice1' signifies the rice crop growing in the first season)
  - year: Signifies the data year (e.g., 2000, 2005, 2010, 2015)
  - system: Indicates whether the growing area pertains to an irrigated ('ir') or rainfed ('rf') system
  - version: Represents the version of the dataset (e.g., v0.1)
Spatial Metadata:
  - Extent: X: −180° to +180°, Y: −90° to +90°, Z (month): Numeric values ranging from 1 to 12, each representing a monthly harvested area layer with 5 arcminutes spatial resolution
  - Resolution: 5-arcminutes (0.083333 decimal degrees)
  - Coordinate reference system: Longitude/latitude (WGS84 datum)
  - Units: growing area (ha)

************************************************************
MAXIMUM MONTHLY GROWING AREA GRIDS (MMHAG) FOR 23 IRRIGATED AND RAINFED CROPS

Description: This dataset presents the maximum monthly growing area grids for 23 irrigated and 23 rainfed crops, with a spatial resolution of 5 arcminutes, for the years 2000, 2005, 2010, and 2015. A maximum monthly grid was determined as the maximum pixel value within each monthly grid without taking multiple cropping into account. These datasets are crucial for users keen to know about non-seasonal crop-specific maximum irrigated and rainfed harvested areas.
File format: GeoTIFF
File name format: MIRCA-OS_crop_year_system_version
  - crop: Represents the crop name
  - year: Signifies the data year (e.g., 2000, 2005, 2010, 2015)
  - system: Indicates whether the growing area pertains to an irrigated ('ir') or rainfed ('rf') system
  - version: Represents the version of the dataset (e.g., v0.1)
Spatial Metadata:
  - Extent: X: −180° to +180°, Y: −90° to +90°
  - Resolution: 5-arcminutes and 30-arcminutes 
  - Coordinate reference system: Longitude/latitude (WGS84 datum)
  - Units: harvested area (ha)

************************************************************
MAXIMUM MONTHLY CROPPED AREA GRIDS (MMCAG) FOR IRRIGATED, RAINFED, OR TOTAL CROPS

Description: These datasets represent the maximum monthly cropped area grids for 23 irrigated and 23 rainfed crops, with a spatial resolution of 5 arcminutes, for the years 2000, 5 arcminutes, for the years 2000, 2005, 2010, and 2015. The maximum monthly cropped area grids of irrigated and rainfed crops were determined by summing the monthly growing area grids of all crops and then selecting the maximum grid cell value from those summed areas.
File format: GeoTIFF
File name format: MIRCA-OS_year_system_version
  - year: Signifies the data year (e.g., 2000, 2005, 2010, 2015)
  - system: Indicates whether the harvested area pertains to an irrigated ('ir'), rainfed ('rf'), or total ('tot') system
  - version: Represents the version of the dataset (e.g., v0.1)
Spatial Metadata:
  - Extent: X: −180° to +180°, Y: −90° to +90°
  - Resolution: 5-arcminutes and 30-arcminutes 
  - Coordinate reference system: Longitude/latitude (WGS84 datum)
  - Units: harvested area (ha)

************************************************************
ANNUAL CROP HARVESTED AREA GRIDS FOR 23 IRRIGATED AND RAINFED CROPS

Description: These data represent annual harvested area grids of 23 irrigated and 23 rainfed crops, with a spatial resolution of 5 arcminutes, for the years 2000, 2005, 2010, and 2015. For crops with a single cropping season, the annual crop harvested area was determined as the maximum pixel value of that specific crop's monthly harvested area grids. For those crops with multiple cropping, an annual harvested area was determined as the sum of each sub-crop's maximum monthly harvested area grids.
File format: GeoTIFF
File name format: MIRCA-OS_crop_year_system_version
Period: 2000 to 2015
  - crop: Represents the crop name
  - year: Signifies the data year (e.g., 2000, 2005, 2010, 2015)
  - system: Indicates whether the harvested area pertains to an irrigated ('ir') or rainfed ('rf') system
  - version: Represents the version of the dataset (e.g., v0.1)
Spatial Metadata:
  - Extent: X: −180° to +180°, Y: −90° to +90°
  - Resolution:5-arcminutes and 30-arcminutes 
  - Coordinate reference system: Longitude/latitude (WGS84 datum)
  - Units: harvested area (ha)

************************************************************
For data citation, please use:
Kebede, E., K. O. Oluoch, S. Siebert, P. Mehta, S. Hartman, J. Jägermeyr, D. Ray, T. Ali, K. A. Brauman, Q. Deng, W. Xie, K. F. Davis (2024). A global open-source dataset of monthly irrigated and rainfed cropped areas (MIRCA-OS) for the 21st century, HydroShare, http://www.hydroshare.org/resource/c6d6aec640de4b0881aa83132990d2b2

************************************************************
CONTACT INFORMATION

For further information, please contact:

- Endalkachew Abebe Kebede: e-mail: endiabe@udel.edu
- Kyle Frankel Davis: e-mail: kfdavis@udel.edu