Access Data on Google Earth Engine

The tables have the following attributes:

• • HYBAS_ID or txId (string): feature's unique identifier

    • HYBAS_ID is for basins. It is the same as the basin's identifier HYBAS_ID in the HydroBASINS dataset

    • txId is for transects. It is the '_' concatenated string derived from the longitude and latitude values, truncated to 4 decimals, of the transect's median point. Specifically, it is "xx.xxxx_yy.yyyy" where xx.xxxx and yy.yyyy are the median's longitude and latitude values truncated to 4 decimals.

  • season (string): Denotes the season. It is of the format "sss_mmm".

    • "sss" denotes the season 

      • "prm" for permanent 

      • "dry" for dry

      • "wet" for wet

    • "mmm" denotes the months the season spans (except for permanent, when this is "DnW" indicating dry and wet season)

      • "fma" for dry season of February-March-April

      • "ond" for wet season of October-November-December

  • sl_perYr (float): Regression slope of the surface water area vs. year Sen's slope regression analysis, and "_perYr" denotes its units, per year.

  • offset (float): Regression offset of the surface water area vs. year Sen's slope regression analysis.

  • tsPtCount (integer): Number of time-points included in the Sen's slope regression analysis.

  • system:index (string): GEE system-generated unique identifier.

The tables have the following attributes:

• HYBAS_ID or txId (string): feature's unique identifier

  • HYBAS_ID is for basins. It is the same as the basin's identifier HYBAS_ID in the HydroBASINS dataset

  • txId is for transects. It is the '_' concatenated string derived from the longitude and latitude values, truncated to 4 decimals, of the transect's median point. Specifically, it is "xx.xxxx_yy.yyyy" where xx.xxxx and yy.yyyy are the median's longitude and latitude values truncated to 4 decimals.

• season (string): Denotes the season. It is of the format "sss_mmm".

  • "sss" denotes the season 

    • "prm" for permanent 

    • "dry" for dry

    • "wet" for wet

  • "mmm" denotes the months the season spans (except for permanent, when this is "DnW" indicating dry and wet season)

    • "fma" for dry season of February-March-April

    • "ond" for wet season of October-November-December

• year (float): Year

• water_ha (float): Area of water pixels in the feature, in hectares.

• notwater_ha (float): Area of notwater pixels in the feature, in hectares.

• nodata_ha (float): Area of nodata pixels in the feature, in hectares.

• nodataFrac (float): Proportion of the feature's area with nodata pixels.

• system:index (string): GEE system-generated unique identifier.

Each image is at a spatial resolution of 30m/pixel, with 3 bands and 6 properties as follows:

• • • Bands

      • drySeasCompos_fma (8-bit unsigned integer)

      • wetSeasCompos_ond (8-bit unsigned integer)

      • prmSeasCompos_DnW (8-bit unsigned integer)

Each pixel in these bands have one of 3 integer values (following the convention in JRC water dataset, Pekel et al. 2016):

• • • • • 2: a pixel with valid data and containing water (denoting "water" pixel)

        • 1: a pixel with valid data and not containing water (denoting "notwater" pixel)

        • 0: a pixel with no valid data (denoting "nodata" pixel)

    • Properties

      • year: year of the image

      • monsoonYearStartMonth: Number (between 1-12) of the month when monsoon (or, hydrological) year starts. It is 6, indicating June, and is the same for all images. A year is taken to be June to May in this analysis.

      • drySeasMonthsOffset: Number of months after monsoonYearStartMonth when dry season starts. It is 8, indicating February.

      • drySeasMonthsTag: Suffix tag, in names of image bands, table columns, etc., indicating the 3 months of the dry season.

      • wetSeasMonthsOffset: Number of months after monsoonYearStartMonth when wet season starts. It is 4, indicating October.

      • wetSeasMonthsTag: Suffix tag, in names of image bands, table columns, etc., indicating the 3 months of the wet season.