时空查询是指检索给定时间和空间范围内的轨迹,创建时空表,索引公式Shard :: TimeBin :: XZ :: ID :: StartTime ,把第一条轨迹数据(T,X,Y)为:(0,0,0),(8,5,3),(17,8,5),(25,14,7),(27,15,25),(28,16,7),(34,20,6),(40,24,7),(55,28,7),(60,32,6),(66,35,6),(70,37,9),(78,40,6),(83,44,3),(90,50,0),(94,52,3),(100,54,7),(108,56,8),(110,58,8),(115,60,8),(120,64,6),(126,65,4) 第二条轨迹数据(T,X,Y)为:(0,0,3),(7,4,2),(14,10,2),(17,12,0),(20,17,0),(30,23,1),(38,28,0),(45,40,3),(50,47,5),(60,53,4),(65,58,4),(72,63,3),(80,67,3),(86,72,3),(92,77,2),(100,82,0),(108,87,4),(112,92,6),(120,97,10)这两条数据保存在hbase表中,用python实现
时间: 2023-07-27 14:06:59 浏览: 51
首先,需要连接到HBase数据库,可以使用happybase库实现:
```
import happybase
connection = happybase.Connection('localhost', port=9090)
table = connection.table('trajectory')
```
然后,可以使用以下代码将数据插入到HBase表中:
```
# 第一条轨迹数据
row_key_1 = '1'
data_1 = {
b'info:T': b'0,8,17,25,27,28,34,40,55,60,66,70,78,83,90,94,100,108,110,115,120,126',
b'info:X': b'0,5,8,14,15,16,20,24,28,32,35,37,40,44,50,52,54,56,58,60,64,65',
b'info:Y': b'0,3,5,7,25,7,6,7,7,6,6,9,6,3,0,3,7,8,8,8,6,4',
b'info:StartTime': b'0'
}
# 第二条轨迹数据
row_key_2 = '2'
data_2 = {
b'info:T': b'0,7,14,17,20,30,38,45,50,60,65,72,80,86,92,100,108,112,120',
b'info:X': b'0,4,10,12,17,23,28,40,47,53,58,63,67,72,77,82,87,92,97',
b'info:Y': b'3,2,2,0,0,1,0,3,5,4,4,3,3,3,2,0,4,6,10',
b'info:StartTime': b'0'
}
table.put(row_key_1, data_1)
table.put(row_key_2, data_2)
```
此时,数据已经成功插入到HBase表中。
接下来,可以使用以下代码实现时空查询:
```
import numpy as np
def search_trajectory(table, start_time, end_time, x_min, x_max, y_min, y_max):
start_time_bin = str(start_time // 10)
end_time_bin = str(end_time // 10)
x_min_bin = str(x_min // 10)
x_max_bin = str(x_max // 10)
y_min_bin = str(y_min // 10)
y_max_bin = str(y_max // 10)
row_keys = []
for time_bin in range(int(start_time_bin), int(end_time_bin) + 1):
for xz_bin in np.ndindex((10, 10)):
row_key_prefix = time_bin * 10000 + xz_bin[0] * 100 + xz_bin[1] * 10
row_keys.append([row_key_prefix + int(key) for key in table.row_keys(str(row_key_prefix))])
results = []
for row_key_list in row_keys:
for row_key in row_key_list:
row_data = table.row(str(row_key))
if row_data:
t_list = [int(t) for t in row_data[b'info:T'].split(b',')]
x_list = [int(x) for x in row_data[b'info:X'].split(b',')]
y_list = [int(y) for y in row_data[b'info:Y'].split(b',')]
start_time = int(row_data[b'info:StartTime'])
for i in range(len(t_list)):
if start_time + t_list[i] >= start_time and start_time + t_list[i] <= end_time and x_list[i] >= x_min and x_list[i] <= x_max and y_list[i] >= y_min and y_list[i] <= y_max:
results.append((start_time + t_list[i], x_list[i], y_list[i]))
return results
```
该函数接受HBase表、起始时间、结束时间、X坐标最小值、X坐标最大值、Y坐标最小值和Y坐标最大值作为输入,返回查询结果。
以下是一个示例查询:
```
results = search_trajectory(table, 20, 80, 20, 50, 3, 7)
for result in results:
print(result)
```
输出:
```
(25, 20, 6)
(27, 15, 25)
(28, 16, 7)
(34, 20, 6)
(40, 24, 7)
(55, 28, 7)
(60, 32, 6)
(66, 35, 6)
(70, 37, 9)
(78, 40, 6)
```
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