int GeohashDecodeToLongLatType(GeoHashBits hash, double[] xy)
{
GeoHashArea area = new GeoHashArea();
if (GeohashDecodeType(hash, area) == 0)
{
return(0);
}
return(GeohashDecodeAreaToLongLat(area, xy));
}
int GeohashDecodeAreaToLongLat(GeoHashArea area, double[] xy)
{
xy[0] = (area.Longitude.Min + area.Longitude.Max) / 2;
xy[1] = (area.Latitude.Min + area.Latitude.Max) / 2;
return(1);
}
int GeohashDecodeType(GeoHashBits hash, GeoHashArea area)
{
GeoHashRange[] r = new GeoHashRange[2];
GeohashGetCoordRange(ref r[0], ref r[1]);
return(GeohashDecode(r[0], r[1], hash, area));
}
int GeohashDecodeWgs84(GeoHashBits hash, GeoHashArea area)
{
return(GeohashDecodeType(hash, area));
}
int GeohashDecode(GeoHashRange longRange, GeoHashRange latRange, GeoHashBits hash, GeoHashArea area)
{
if (Hashiszero(hash) || Rangeiszero(latRange) ||
Rangeiszero(longRange))
{
return(0);
}
area.Hash = hash;
ushort step = hash.Step;
ulong hashSep = Deinterleave64(hash.Bits); /* hash = [LAT][LONG] */
double latScale = latRange.Max - latRange.Min;
double longScale = longRange.Max - longRange.Min;
ulong ilato = hashSep; /* get lat part of deinterleaved hash */
ulong ilono = hashSep >> 32; /* shift over to get long part of hash */
/* divide by 2**step.
* Then, for 0-1 coordinate, multiply times scale and add
* to the min to get the absolute coordinate. */
area.Latitude.Min =
latRange.Min + (ilato * 1.0 / (1ul << step)) * latScale;
area.Latitude.Max =
latRange.Min + ((ilato + 1) * 1.0 / (1ul << step)) * latScale;
area.Longitude.Min =
longRange.Min + (ilono * 1.0 / (1ul << step)) * longScale;
area.Longitude.Max =
longRange.Min + ((ilono + 1) * 1.0 / (1ul << step)) * longScale;
return(1);
}
