class Trend:
    STABLE = "stable"
    ACCRETING = "accreting"
    ERODING = "eroding"


class Statistic:
    SCE = "SCE"
    EPR = "EPR"
    NSM = "NSM"
    LRR = "LRR"
    LR2 = "LR2"
    LSE = "LSE"
    LCI = "LCI"
    WLR = "WLR"
    WR2 = "WR2"
    WSE = "WSE"
    WCI = "WCI"


class AreaChangeField:
    TREND = "area_trend"
