RDB 2: rdb-example-02-insert-points.py

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rdb-example-02-insert-points.py
1 #!/usr/bin/env python3
2 # -*- coding: utf-8 -*-
3 #
4 #*******************************************************************************
5 #
6 # Copyright 2026 RIEGL Laser Measurement Systems
7 #
8 # Licensed under the Apache License, Version 2.0 (the "License");
9 # you may not use this file except in compliance with the License.
10 # You may obtain a copy of the License at
11 #
12 # http://www.apache.org/licenses/LICENSE-2.0
13 #
14 # Unless required by applicable law or agreed to in writing, software
15 # distributed under the License is distributed on an "AS IS" BASIS,
16 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
17 # See the License for the specific language governing permissions and
18 # limitations under the License.
19 #
20 # SPDX-License-Identifier: Apache-2.0
21 #
22 #*******************************************************************************
23 #
24 """
25 rdb-example-02-insert-points.py
26
27 This example shows how to open an existing database and add some points.
28 This example is based on the database of rdb-example-1-create-database.
29 """
30
31 import random
32
33 import riegl.rdb
34
35
36 def example_plain():
37 """
38 Basic example to add some points.
39 """
40 # Access existing database
41 with riegl.rdb.rdb_open("pointcloud.rdbx") as rdb:
42
43 # Query some attribute details
44 details_coordinates = rdb.point_attributes["riegl.xyz"]
45 details_reflectance = rdb.point_attributes["riegl.reflectance"]
46
47 # Before we can modify the database, we must start a transaction
48 with riegl.rdb.Transaction(
49 rdb, # point cloud object
50 "Import", # transaction title
51 "Point Importer v1.0" # software name
52 ) as transaction:
53
54 # Prepare point attribute buffers
55 buffer_size = 100 # point block/chunk size
56 point_count = 1500 # total number of points
57 buffer_coordinates = riegl.rdb.AttributeBuffer(
58 details_coordinates, buffer_size
59 )
60 buffer_reflectance = riegl.rdb.AttributeBuffer(
61 details_reflectance, buffer_size
62 )
63
64 # Start new insert query and define buffers
65 with rdb.insert() as query:
66 query.bind(buffer_coordinates)
67 query.bind(buffer_reflectance)
68
69 # Insert points block-wise
70 total = 0
71 while total < point_count:
72 # Fill buffers with some random data
73 for i in range(buffer_size):
74 buffer_coordinates[i] = [random.uniform(
75 details_coordinates.minimum_value,
76 details_coordinates.maximum_value
77 ) for _ in range(3)]
78 buffer_reflectance[i] = random.uniform(
79 details_reflectance.minimum_value,
80 details_reflectance.maximum_value
81 )
82
83 # Actually insert points
84 total += query.next(buffer_size)
85
86 # Finally commit transaction
87 transaction.commit()
88
89
90 def example_numpy():
91 """
92 Similar to example_plain() but we use NumPy arrays here.
93 """
94 import numpy as np
95
96 # Create some numpy arrays
97 c = np.array([[1, 2, 3], [4, 5, 6]])
98 r = np.array([7, 8])
99
100 # Access existing database
101 with riegl.rdb.rdb_open("pointcloud.rdbx") as rdb:
102
103 # Before we can modify the database, we must start a transaction
104 with riegl.rdb.Transaction(
105 rdb, # point cloud object
106 "Import", # transaction title
107 "Point Importer v1.0" # software name
108 ) as transaction:
109
110 # Start inserting points
111 with rdb.insert() as insert:
112 # Create buffers for all point attributes
113 buffers = riegl.rdb.PointBuffer(rdb, count=len(c), attributes=[
114 "riegl.xyz",
115 "riegl.reflectance"
116 ])
117
118 # Copy data to point attribute buffers
119 np.copyto(buffers["riegl.xyz"] .data, c)
120 np.copyto(buffers["riegl.reflectance"].data, r)
121
122 # Actually insert points
123 insert.bind(buffers)
124 insert.next(len(c))
125
126 # Finally commit transaction
127 transaction.commit()
128
129
130 if __name__ == "__main__":
131 example_plain()
132 example_numpy()