def encodeValue(self, value):
        if value is True:
            return "T"
        if value == -1:
            return "?"
        return "F"
Returns a new RasterQuerySet with subsetted/summarized ndarrays.
dataset/ETHPy150Open kennethreitz/tablib/tablib/packages/dbfpy3/fields.py/DbfLogicalFieldDef.encodeValue--crossover with--dataset/ETHPy150Open bkg/django-spillway/spillway/query.py/RasterQuerySet.summarize