RDB 2: riegl/rdb/pointcloud/pointAttribute.hpp Source File

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pointAttribute.hpp
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1 /*
2 *******************************************************************************
3 *
4 * Copyright 2026 RIEGL Laser Measurement Systems
5 *
6 * Licensed under the Apache License, Version 2.0 (the "License");
7 * you may not use this file except in compliance with the License.
8 * You may obtain a copy of the License at
9 *
10 * http://www.apache.org/licenses/LICENSE-2.0
11 *
12 * Unless required by applicable law or agreed to in writing, software
13 * distributed under the License is distributed on an "AS IS" BASIS,
14 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
15 * See the License for the specific language governing permissions and
16 * limitations under the License.
17 *
18 * SPDX-License-Identifier: Apache-2.0
19 *
20 *******************************************************************************
21 */
22 /*!
23 *******************************************************************************
24 *
25 * \file pointAttribute.hpp
26 * \author RIEGL LMS GmbH, Austria
27 * \brief Point attribute description
28 * \version 2015-10-14/AW: Initial version
29 * \version 2016-11-28/AW: Compression options added (#2423)
30 * \version 2016-12-20/AW: New functions to load/save settings from/to JSON
31 * \version 2017-03-22/AW: Point attribute scale factor added (#2552)
32 * \version 2017-03-28/AW: Documentation of JSON load/save functions updated
33 * \version 2017-11-09/AW: New function to suggest buffer data type (#2587)
34 * \version 2017-11-24/AW: Constructors declared as "explicit" (#2825)
35 * \version 2018-03-09/AW: New attribute property "invalid value" added (#3047)
36 * \version 2018-06-22/AW: Attribute length type changed to uint32 (#3117)
37 * \version 2018-07-05/AW: Add string conversion operator function
38 * \version 2019-01-21/AW: New attribute property "lod settings" added
39 * \version 2019-02-15/AW: Fix C++ API wrapper of PointAttribute class
40 * \version 2020-02-21/AW: Class 'PointAttribute' is now context-free (#3544)
41 * \version 2022-01-26/AW: Add optional point attribute tags (#4128)
42 * \version 2022-03-18/AW: Add optional list of named values (#4128)
43 * \version 2023-10-04/AW: Add attribute definition string size limits (#4790)
44 *
45 *******************************************************************************
46 */
47
48 #ifndef RIEGL_RDB_POINTCLOUD_POINTATTRIBUTE_HPP
49 #define RIEGL_RDB_POINTCLOUD_POINTATTRIBUTE_HPP
50
51 //---< INCLUDES >---------------------------------------------------------------
52
53 #include <map>
54 #include <limits>
55 #include <string>
56 #include <cstdlib>
57 #include <cstdint>
58
59 #include "riegl/rdb/context.hpp"
60 #include "riegl/rdb/pointcloud/dataTypes.hpp"
61
62 //---< NAMESPACE >--------------------------------------------------------------
63
64 namespace riegl {
65 namespace rdb {
66 namespace pointcloud {
67
68 //---< CLASS PointAttribute >---------------------------------------------------
69 /*!
70 * \brief Point attribute description
71 *
72 * This class describes a point attribute. The database uses this
73 * information for internal attribute representation and compression.
74 *
75 * While the name is a unique identifier, the description holds some
76 * text that client programs might display the user in some way. Also
77 * the physical unit is not used by the database but can be presented
78 * to the user (see PointAttribute::unitSymbol).
79 *
80 * To avoid point attribute name conflicts, the names (not the titles)
81 * shall contain a namespace prefix. Namespace and attribute name are
82 * separated by a dot (".", e.g. "riegl.xyz"). The default namespace
83 * "riegl" is used if no namespace is given.
84 *
85 * \remarks
86 *
87 * If the attribute is a vector (i.e. length > 1), then you might append
88 * a zero-based vector element index to the attribute name when inserting,
89 * updating or selecting points. Example: use "rgb[0]" to access the red
90 * color component (0), the green (1) and blue (2) components are not read
91 * or modified in this case.
92 *
93 * Furthermore, the minimum, maximum and default values are applied to all
94 * elements of vectors and the vector length must be in the range [1..100000].
95 *
96 * PointAttribute::defaultValue is returned when reading a point attribute
97 * that has never been written before. The value must be between minimum and
98 * maximum (both inclusive).
99 *
100 * PointAttribute::invalidValue may be used to define a value that represents
101 * an invalid/undefined/unknown value. The value must be between minimum and
102 * maximum (both inclusive) and must be a multiple of the resolution value.
103 * The value may be equal to the default value and you may use "NaN" (not a
104 * number) to signal that there is no "invalid value".
105 *
106 * \note
107 *
108 * Attribute names may only contain following ASCII characters:
109 *
110 * - a-z
111 * - A-Z
112 * - 0-9
113 * - .
114 * - _
115 *
116 * Attribute title, description and unit symbol may contain any UTF-8 character.
117 *
118 * \see riegl::rdb::pointcloud::PointAttributes
119 */
120 class PointAttribute
121 {
122 public:
123 /*!
124 * \brief Data Storage Class
125 *
126 * The storage class gives a hint about how often a point attribute
127 * is expected to change. This might be helpful for the database to
128 * optimize data structures for speed or file size.
129 */
130 enum StorageClass
131 {
132 CONSTANT = 1, //!< value cannot be changed
133 VARIABLE = 2, //!< value can change from time to time
134 DYNAMIC = 3 //!< value is likely to be changed often
135 };
136
137 /*!
138 * \brief Data Compression Options
139 *
140 * The data of all point attributes is compressed with the settings defined
141 * during the database creation (see class CreateSettings). Additionally,
142 * the data may be pre-processed using one or more of the following methods:
143 */
144 enum CompressionOptions
145 {
146 DEFAULT = 0, //!< nothing special, just use default compression algorithm
147 DELTA = 1, //!< calculate differences between two consecutive values
148 SHUFFLE = 2, //!< shuffle bytes of point attribute values
149 DELTA_SHUFFLE = 3 //!< calculate differences and shuffle bytes
150 };
151
152 std::string name; //!< unique attribute name (for queries) \see details of class PointAttribute, string size limits: [1, 100]
153 std::string title; //!< attribute title (for display), string size limits: [1, 100]
154 std::string tags; //!< attribute tags (comma separated, e.g. "position, transform"), string size limits: [0, 5000]
155 std::string description; //!< attribute description (for display), string size limits: [0, 5000]
156 std::string unitSymbol; //!< physical unit symbol (e.g. "m", "rad", "K"), string size limits: [0, 100]
157 std::uint32_t length; //!< number of dimensions/elements (1: scalar, >1: vector, e.g. 3 for point coordinates)
158 double resolution; //!< expected value resolution
159 double minimumValue; //!< theoretical minimum value
160 double maximumValue; //!< theoretical maximum value
161 double defaultValue; //!< default value (minimum <= default <= maximum)
162 double invalidValue; //!< invalid value (minimum <= invalid <= maximum, use "not-a-number" if there is no invalid value)
163 std::string namedValues; //!< list of VALUE=NAME pairs separated by a single line feed character (LF, ASCII 0x0A), string size limits: [0, 1000000]
164 std::uint8_t storageClass; //!< storage class \see enum StorageClass
165 std::uint8_t compressionOptions; //!< options additional to default compression
166
167 /*!
168 * \brief Level of detail settings
169 *
170 * This field defines the method to be used to generate level of detail
171 * data (LOD) for this point attribute. Depending on the LOD mode defined
172 * during database creation (see CreateSettings::LodMode), several LOD
173 * methods are available. A list of all methods and their settings can
174 * be found in file "/manual/riegl_rdb_lod_methods.json" in the RDB SDK.
175 *
176 * String size limits: [0, 50000]
177 */
178 std::string lodSettings;
179
180 /*!
181 * \brief optional scale factor applied to real numbers (i.e. resolution not equal to 1.0)
182 *
183 * - reading points: resultValue = originalValue * scaleFactor
184 * - writing points: storedValue = givenValue / scaleFactor
185 */
186 double scaleFactor;
187
188 /*!
189 * \brief Map of VALUE=NAME pairs
190 *
191 * \see namedValues
192 * \see getNamedValues()
193 * \see setNamedValues()
194 */
195 typedef std::map<long long int, std::string> NamedValuesMap;
196
197 public:
198 ~PointAttribute();
199
200 /*!
201 * \brief Default constructor
202 *
203 * All properties are set to default values.
204 */
205 explicit PointAttribute(
206 const std::string &name = "none",
207 const std::string &title = "none",
208 const std::string &description = "",
209 const std::string &unitSymbol = "",
210 const std::uint32_t &length = 0,
211 const double &resolution = 1.0,
212 const double &minimumValue = 0.0,
213 const double &maximumValue = 0.0,
214 const double &defaultValue = 0.0,
215 const std::uint8_t &storageClass = CONSTANT,
216 const std::uint8_t &compressionOptions = DEFAULT,
217 const double &scaleFactor = 1.0,
218 const double &invalidValue = std::numeric_limits<double>::quiet_NaN(),
219 const std::string &lodSettings = "default",
220 const std::string &tags = "",
221 const std::string &namedValues = ""
222 );
223
224 /// \deprecated since 2.2.3 - use the context-free constructors instead
225 explicit PointAttribute(riegl::rdb::Context &context);
226
227 /*!
228 * \brief Copy constructor
229 *
230 * All properties are copied from the given attribute object.
231 */
232 PointAttribute(const PointAttribute &attribute);
233
234 /*!
235 * \brief Assignment operator
236 *
237 * All properties are copied from the given attribute object.
238 */
239 PointAttribute& operator=(const PointAttribute &attribute);
240
241 //__________________________________________________________________________
242 /*!
243 * \brief Copy assignment
244 *
245 * This function is mainly for backward compatibility reasons. You may
246 * also use the copy constructor or copy assignment operator instead.
247 */
248 void assign(PointAttribute &target) const
249 {
250 target = *this;
251 }
252
253 //__________________________________________________________________________
254 /*!
255 * \brief Get attribute name and vector index from attribute descriptor
256 *
257 * This function decodes the given attribute descriptor into attribute name and attribute
258 * vector index. The optional vector index is enclosed in square brackets and follows the
259 * point attribute name. If no vector index is given, then index -1 is returned. If the
260 * vector index cannot be interpreted as a single positive integer value, then an empty
261 * name and index -2 is returned.
262 *
263 * Examples:
264 * descriptor | name | index
265 * ------------|-------|-------
266 * "xyz" | "xyz" | -1
267 * "xyz[0]" | "xyz" | 0
268 * "rgb[1]" | "rgb" | 1
269 */
270 static void decodeDescriptor(
271 const std::string &descriptor, //!< [in] attribute descriptor, e.g. "xyz", "rgb[1]"
272 std::string &name, //!< [out] attribute name, e.g. "xyz", "rgb"
273 std::int32_t &index //!< [out] attribute vector index, e.g. -1, 1
274 );
275
276 //__________________________________________________________________________
277 /*!
278 * \brief Get map from named values string
279 *
280 * This function decodes the `namedValues` string into a map.
281 *
282 * \see namedValues
283 * \see NamedValuesMap
284 * \see setNamedValues()
285 */
286 NamedValuesMap getNamedValues() const;
287
288 //__________________________________________________________________________
289 /*!
290 * \brief Set named values string from map
291 *
292 * This function generates the `namedValues` string from a map.
293 *
294 * \see namedValues
295 * \see NamedValuesMap
296 * \see getNamedValues()
297 */
298 void setNamedValues(const NamedValuesMap &map);
299
300 /*!
301 * \brief Load settings from JSON string
302 *
303 * This function parses the given JSON string and applies all available
304 * properties - missing properties are silently ignored (i.e. the value
305 * remains unchanged). When parsing the JSON string fails, an exception
306 * is thrown.
307 *
308 * Example JSON string:
309 *
310 * {
311 * "name": "riegl.reflectance",
312 * "title": "Reflectance",
313 * "tags": "",
314 * "description": "Target surface reflectance",
315 * "unit_symbol": "dB",
316 * "length": 1,
317 * "resolution": 0.01,
318 * "minimum_value": -327.68,
319 * "maximum_value": 327.67,
320 * "default_value": 0.0,
321 * "invalid_value": null,
322 * "named_values": {},
323 * "storage_class": "variable",
324 * "compression_options": "shuffle",
325 * "lod_settings": "default",
326 * "scale_factor": 1.0
327 * }
328 */
329 void load(const std::string &json);
330
331 /*!
332 * \brief Save settings to JSON string
333 * \see load()
334 */
335 std::string save() const;
336
337 /*!
338 * \brief Get buffer data type
339 *
340 * This function suggests a data type that is suitable to
341 * construct a buffer for storing values of this attribute.
342 *
343 * The suggestion is based on the resolution, minimumValue
344 * and maximumValue properties, all others are ignored.
345 */
346 riegl::rdb::pointcloud::DataType dataType() const;
347
348 //! \brief Get attribute name
349 operator const std::string&() const { return name; }
350
351 private:
352 friend class PointAttributeWrapper;
353 void *data;
354 };
355
356 }}} // namespace riegl::rdb::pointcloud
357
358 #endif // RIEGL_RDB_POINTCLOUD_POINTATTRIBUTE_HPP
riegl::rdb::pointcloud::PointAttribute::NamedValuesMap
std::map< long long int, std::string > NamedValuesMap
Map of VALUE=NAME pairs.
Definition: pointAttribute.hpp:195
riegl::rdb::pointcloud::PointAttribute::DEFAULT
nothing special, just use default compression algorithm
Definition: pointAttribute.hpp:146
riegl::rdb::pointcloud::PointAttribute::CONSTANT
value cannot be changed
Definition: pointAttribute.hpp:132
riegl::rdb::pointcloud::PointAttribute::StorageClass
StorageClass
Data Storage Class.
Definition: pointAttribute.hpp:130
riegl::rdb::pointcloud::PointAttribute::decodeDescriptor
static void decodeDescriptor(const std::string &descriptor, std::string &name, std::int32_t &index)
Get attribute name and vector index from attribute descriptor.
riegl::rdb::pointcloud::DataType
DataType
Point attribute access data type.
Definition: dataTypes.hpp:56
riegl::rdb::Context
Library context.
Definition: context.hpp:75
riegl::rdb::pointcloud::PointAttribute::SHUFFLE
shuffle bytes of point attribute values
Definition: pointAttribute.hpp:148
riegl::rdb::pointcloud::PointAttribute::compressionOptions
std::uint8_t compressionOptions
options additional to default compression
Definition: pointAttribute.hpp:165
riegl::rdb::pointcloud::PointAttribute::name
std::string name
unique attribute name (for queries)
Definition: pointAttribute.hpp:152
riegl::rdb::pointcloud::PointAttribute::minimumValue
double minimumValue
theoretical minimum value
Definition: pointAttribute.hpp:159
riegl::rdb::pointcloud::PointAttribute::DELTA_SHUFFLE
calculate differences and shuffle bytes
Definition: pointAttribute.hpp:149
riegl::rdb::pointcloud::PointAttribute::scaleFactor
double scaleFactor
optional scale factor applied to real numbers (i.e. resolution not equal to 1.0)
Definition: pointAttribute.hpp:186
riegl::rdb::pointcloud::PointAttribute::defaultValue
double defaultValue
default value (minimum <= default <= maximum)
Definition: pointAttribute.hpp:161
riegl::rdb::pointcloud::PointAttribute::~PointAttribute
~PointAttribute()
riegl::rdb::pointcloud::PointAttribute::lodSettings
std::string lodSettings
Level of detail settings.
Definition: pointAttribute.hpp:178
context.hpp
RDB library context.
riegl::rdb::pointcloud::PointAttribute::description
std::string description
attribute description (for display), string size limits: [0, 5000]
Definition: pointAttribute.hpp:155
riegl::rdb::pointcloud::PointAttribute::load
void load(const std::string &json)
Load settings from JSON string.
riegl::rdb::pointcloud::PointAttribute::assign
void assign(PointAttribute &target) const
Copy assignment.
Definition: pointAttribute.hpp:248
riegl::rdb::pointcloud::PointAttribute::tags
std::string tags
attribute tags (comma separated, e.g. "position, transform"), string size limits: [0...
Definition: pointAttribute.hpp:154
riegl::rdb::pointcloud::PointAttribute::save
std::string save() const
Save settings to JSON string.
riegl::rdb::pointcloud::PointAttribute::VARIABLE
value can change from time to time
Definition: pointAttribute.hpp:133
riegl::rdb::pointcloud::PointAttribute::dataType
riegl::rdb::pointcloud::DataType dataType() const
Get buffer data type.
riegl::rdb::pointcloud::PointAttribute
Point attribute description.
Definition: pointAttribute.hpp:120
riegl::rdb::pointcloud::PointAttribute::namedValues
std::string namedValues
list of VALUE=NAME pairs separated by a single line feed character (LF, ASCII 0x0A), string size limits: [0, 1000000]
Definition: pointAttribute.hpp:163
riegl::rdb::pointcloud::PointAttribute::invalidValue
double invalidValue
invalid value (minimum <= invalid <= maximum, use "not-a-number" if there is no invalid value) ...
Definition: pointAttribute.hpp:162
riegl::rdb::pointcloud::PointAttribute::DELTA
calculate differences between two consecutive values
Definition: pointAttribute.hpp:147
riegl::rdb::pointcloud::PointAttribute::storageClass
std::uint8_t storageClass
storage class
Definition: pointAttribute.hpp:164
riegl::rdb::pointcloud::PointAttribute::length
std::uint32_t length
number of dimensions/elements (1: scalar, >1: vector, e.g. 3 for point coordinates) ...
Definition: pointAttribute.hpp:157
riegl::rdb::pointcloud::PointAttribute::DYNAMIC
value is likely to be changed often
Definition: pointAttribute.hpp:134
riegl::rdb::pointcloud::PointAttribute::unitSymbol
std::string unitSymbol
physical unit symbol (e.g. "m", "rad", "K"), string size limits: [0, 100]
Definition: pointAttribute.hpp:156
riegl::rdb::pointcloud::PointAttribute::title
std::string title
attribute title (for display), string size limits: [1, 100]
Definition: pointAttribute.hpp:153
riegl::rdb::pointcloud::PointAttribute::CompressionOptions
CompressionOptions
Data Compression Options.
Definition: pointAttribute.hpp:144
riegl::rdb::pointcloud::PointAttribute::PointAttributeWrapper
friend class PointAttributeWrapper
Definition: pointAttribute.hpp:352
dataTypes.hpp
Point attribute access data types.
riegl::rdb::pointcloud::PointAttribute::setNamedValues
void setNamedValues(const NamedValuesMap &map)
Set named values string from map.
riegl::rdb::pointcloud::PointAttribute::operator=
PointAttribute & operator=(const PointAttribute &attribute)
Assignment operator.
riegl::rdb::pointcloud::PointAttribute::getNamedValues
NamedValuesMap getNamedValues() const
Get map from named values string.
riegl::rdb::pointcloud::PointAttribute::maximumValue
double maximumValue
theoretical maximum value
Definition: pointAttribute.hpp:160
riegl::rdb::pointcloud::PointAttribute::resolution
double resolution
expected value resolution
Definition: pointAttribute.hpp:158
riegl::rdb::pointcloud::PointAttribute::PointAttribute
PointAttribute(const std::string &name="none", const std::string &title="none", const std::string &description="", const std::string &unitSymbol="", const std::uint32_t &length=0, const double &resolution=1.0, const double &minimumValue=0.0, const double &maximumValue=0.0, const double &defaultValue=0.0, const std::uint8_t &storageClass=CONSTANT, const std::uint8_t &compressionOptions=DEFAULT, const double &scaleFactor=1.0, const double &invalidValue=std::numeric_limits< double >::quiet_NaN(), const std::string &lodSettings="default", const std::string &tags="", const std::string &namedValues="")
Default constructor.