RDB 2: rdb-example-06-database-stat.py

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rdb-example-06-database-stat.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-06-database-stat.py
26
27 This example shows how to open an existing database and output some
28 information about the database like the list of point attributes,
29 number of points and point cloud extents.
30 """
31
32 import riegl.rdb
33
34 # Open existing database using default settings
35 with riegl.rdb.rdb_open("pointcloud.rdbx") as rdb:
36 print("META DATA:")
37 for key in rdb.meta_data:
38 print(f" Name: {key}")
39 print(f" Value: {rdb.meta_data[key]}")
40 print("-" * 80)
41 # to write text: rdb.meta_data["my_text"] = "Example"
42 # to write JSON: rdb.meta_data["my_json"] = json.dumps({"name": "value"})
43
44 print("POINT ATTRIBUTES:")
45 for attribute in rdb.point_attributes.values():
46 print(f" Name: {attribute.name}")
47 print(f" Title: {attribute.title}")
48 print(f" Description: {attribute.description}")
49 print(f" Unit: {attribute.unit_symbol}")
50 print(f" Length: {attribute.length}")
51 print(f" Resolution: {attribute.resolution}")
52 print(f" MinimumValue: {attribute.minimum_value}")
53 print(f" MaximumValue: {attribute.maximum_value}")
54 print(f" DefaultValue: {attribute.default_value}")
55 print("-" * 80)
56
57 with rdb.stat as stat:
58 print("POINT CLOUD STATISTICS:")
59 print(f" Total point count: {stat.point_count_total}")
60 print(f" Minimum X, Y, Z: {stat.minimum('riegl.xyz')}")
61 print(f" Maximum X, Y, Z: {stat.maximum('riegl.xyz')}")
62
63 print("PRIMARY INDEX STATISTICS:")
64 leaves = [
65 (
66 leaf.point_count_node,
67 leaf.minimum("riegl.xyz"),
68 leaf.maximum("riegl.xyz")
69 )
70 for leaf in stat.leaves
71 ]
72 print(f" Number of leaf nodes: {len(leaves)}")
73 print(" Point count, minimum and maximum coordinates for all leaves:")
74 for leaf in leaves:
75 print(f" {leaf[0]}, {leaf[1]} - {leaf[2]}")