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https://github.com/fleetdm/fleet
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70524b6e3a
* Initial work on sandbox data pipeline * Update python code to have preliminary code * Added in final code for sandbox-data. Huge delay because I needed to double check licensing
87 lines
2.1 KiB
Python
87 lines
2.1 KiB
Python
# coding: UTF-8
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# Coder for Japanese iarea grid code.
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# NTT DoCoMo's Open iArea in Japan use a gridcode which is very similar to
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# JIS X 0410, but absolutely different in detail.
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def _encode_i2c(lat,lon,basebits):
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t=[]
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for i in range(basebits-3):
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t.append((lat&1)*2 + (lon&1))
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lat = lat>>1
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lon = lon>>1
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if basebits>=3:
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t.append(lon&7)
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t.append(lat&7)
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lat = lat>>3
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lon = lon>>3
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t.append(lon)
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t.append(lat)
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t.reverse()
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return ''.join([str(i) for i in t])
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def encode(lat, lon):
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if lat<7 or lon<100:
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raise Exception('Unsupported location')
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basebits = 8
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return _encode_i2c(int(lat * (1<<basebits) * 1.5), int((lon-100.0)*(1<<basebits)), basebits)
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def _decode_c2i(gridcode):
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lat = lon = 0
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base = 1
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basebits = 0
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if len(gridcode)>6:
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for i in gridcode[6:]:
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lat = (lat<<1) + int(int(i)/2)
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lon = (lon<<1) + int(i)%2
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base = base<<1
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basebits += 1
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if len(gridcode)>4:
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lat = int(gridcode[4:5])*base + lat
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lon = int(gridcode[5:6])*base + lon
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base = base<<3
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basebits += 3
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lat = int(gridcode[0:2])*base + lat
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lon = int(gridcode[2:4])*base + lon
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return (lat, lon, basebits)
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def decode_sw(gridcode, delta=False):
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lat, lon, basebits = _decode_c2i(gridcode)
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if delta:
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return (float(lat)/(1.5*(1<<basebits)), float(lon)/(1<<basebits)+100.0, 1.0/(1.5*(1<<basebits)), 1.0/(1<<basebits))
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else:
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return (float(lat)/(1.5*(1<<basebits)), float(lon)/(1<<basebits)+100.0)
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def decode(gridcode):
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lat, lon, basebits = _decode_c2i(gridcode)
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return ((lat<<1)+1)/float(3<<basebits), 100.0+((lon<<1)+1)/float(2<<basebits)
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def bbox(gridcode):
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(a,b,c,d) = decode_sw(gridcode, True)
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return {'w':a, 's':b, 'n':b+d, 'e':a+c}
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def neighbors(gridcode):
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(lat,lon,basebits)=_decode_c2i(gridcode)
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ret = []
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for i in ((0,-1),(0,1),(1,-1),(1,0),(1,1),(-1,-1),(-1,0),(-1,1)):
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tlat=lat+i[0]
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tlon=lon+i[1]
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if tlat<0 or tlat>(90<<basebits):
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continue
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if tlon<0 or tlon>(100<<basebits):
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continue
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ret.append(_encode_i2c(tlat,tlon,basebits))
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return ret
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def expand(gridcode):
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ret = neighbors(gridcode)
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ret.append(gridcode)
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return ret
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