Strabon

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author Dimitris Bilidas <d.bilidas@di.uoa.gr>
date Mon Nov 09 18:09:06 2020 +0200 (2020-11-09)
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charnik@211 1 Strabon
charnik@211 2 -----------
charnik@211 3
charnik@211 4 Introduction
charnik@211 5 ============
charnik@211 6 Strabon is a fully implemented semantic geospatial database system that can be
charnik@211 7 used to store linked geospatial data expressed in RDF and query them using an
charnik@211 8 extension of SPARQL. Strabon supports spatial selections, spatial joins, a rich
charnik@211 9 set of spatial functions similar to those offered by geospatial relational
charnik@211 10 database systems, support for multiple Coordinate Reference Systems and widely
charnik@211 11 used serializations for geometric objects such as WKT and GML. Strabon is built
charnik@211 12 on top of the well-known RDF store Sesame and extends Sesame’s components to be
charnik@211 13 able to manage thematic and spatial data that are stored in PostGIS.
charnik@211 14
charnik@211 15 The development of Strabon started in the context of European FP7 project
charnik@211 16 SemsorGrid4Env (Semantic Sensor Grids for Rapid Application Development for
charnik@211 17 Environmental Management) [http://www.semsorgrid4env.eu/]. Starting September
charnik@211 18 2011, Strabon is being utilized and extended with new functionalities in the
charnik@211 19 FP7 project TELEIOS (Virtual Observatory Infrastructure for Earth Observation
charnik@211 20 Data) [http://www.earthobservatory.eu/] which our group leads.
charnik@211 21
charnik@211 22 The query language of Strabon is called stSPARQL. stSPARQL can be used to query
charnik@211 23 data represented in an extension of RDF called stRDF. stRDF and stSPARQL have
charnik@211 24 been designed for representing and querying geospatial data that changes over
charnik@211 25 time (e.g., the growth of a city over the years due to new developments).
charnik@211 26
charnik@211 27 Currently, only the geospatial features of stSPARQL have been implemented fully.
charnik@211 28 The temporal features are the subject of current work.
charnik@211 29
kkyzir@639 30 Given the very close relationship between stSPARQL and GeoSPARQL which is a
kkyzir@639 31 recent OGC standard for an extension of SPARQL for querying geospatial metadata,
kkyzir@639 32 we recently provided support for the Core, Geometry and Geometry Topology
kkyzir@639 33 extension of GeoSPARQL.
kkyzir@639 34
charnik@211 35
charnik@1006 36 Conformance to GeoSPARQL
charnik@1006 37 ========================
charnik@1006 38 Strabon implements the `Core', the `Topology Vocabulary Extension', the
charnik@1006 39 `Geometry Extension', the `Geometry Topology Extension', and the `RDFS Entailment
charnik@1006 40 Extension' except for Req. 25
charnik@1006 41 (http://www.opengis.net/spec/geosparql/1.0/req/rdfs-entailment-extension/bgp-rdfs-ent).
charnik@1006 42
charnik@1006 43 With respect to GML, Strabon supports the GML Profile corresponding to Simple
charnik@1009 44 Features, that is, GML Simple Features Profile 2.0.
charnik@1006 45
charnik@1006 46
charnik@212 47 Strabon Homepage
charnik@212 48 ================
charnik@212 49 The homepage of Strabon is at http://www.strabon.di.uoa.gr/.
charnik@212 50
charnik@212 51
charnik@211 52 Demo
charnik@211 53 ====
charnik@211 54 You can find a demo of the system Strabon at http://test.strabon.di.uoa.gr/NOA/.
charnik@211 55
charnik@212 56
charnik@1022 57 How to build and run Strabon from command line
charnik@1022 58 ==============================================
charnik@1022 59 Assuming you have already downloaded Strabon and you are in the top-level
charnik@1022 60 directory of Strabon, issue the following command to build it from command line:
charnik@1022 61
kkyzir@1118 62 $ mvn clean package
charnik@1022 63
psmeros@1205 64 In order to run automatically the JUnit tests, pass the option `-DskipTests=false'
kkyzir@1118 65 to the above command. The complete command is the following:
charnik@1022 66
kkyzir@1118 67 $ mvn -DskipTests=false clean package
charnik@1022 68
charnik@1365 69 Alternatively, it is possible to run a specific test. Supposing that the name of
charnik@1365 70 the corresponding class is `TestName', then you can run only this
charnik@1365 71 test using the following command:
charnik@1365 72
charnik@1365 73 $ mvn test -DfailIfNoTests=false -DskipTests=false -Dtest=TestName
charnik@1365 74
charnik@1022 75 In case of an error during building of Strabon and assuming that the error does
charnik@1022 76 not come from the JUnit tests, please have a look at the `Known Issues' section
charnik@1022 77 below. If none of the known issues of that section applies, please contact the
charnik@1022 78 developers through the Strabon mailing-list or submit a corresponding bug
charnik@1022 79 (see `Bugs' section below).
charnik@1022 80
charnik@1022 81 After you have successfully built Strabon, you have access to the following
charnik@1022 82 components:
charnik@1022 83
charnik@1022 84 * Strabon Endpoint
charnik@1022 85
charnik@1022 86 This is a SPARQL endpoint for Strabon. It is distributed as a war file so
charnik@1022 87 you may deploy it in a Tomcat container. You may find the war file under
charnik@1022 88 directory `endpoint/target'.
charnik@1022 89
charnik@1022 90 * Strabon Endpoint (standalone)
charnik@1022 91
charnik@1022 92 This is a SPARQL endpoint for Strabon like the above one, but it differs
charnik@1022 93 only in that it does not require the user to have already set up a Tomcat
charnik@1022 94 container. The standalone Strabon Endpoint may be run by issuing the
charnik@1022 95 following command:
charnik@1022 96
charnik@1022 97 $ java -jar endpoint-exec/target/strabon-endpoint-executable-${version}.jar
charnik@1022 98
charnik@1022 99 After issuing the above command, you may access the Strabon Endpoint at
charnik@1022 100 the following URL: <http://localhost:8080/>.
charnik@1022 101
charnik@1022 102 Please see the page at <http://hg.strabon.di.uoa.gr/Strabon/rev/674f8f91162b>
charnik@1022 103 to find out other options that you may pass to the Tomcat container that
charnik@1022 104 will run by the above command.
charnik@1022 105
charnik@1022 106 SPECIAL NOTE: if you need to configure the connection details to the
charnik@1022 107 underlying database, you may do so in two ways:
charnik@1022 108 1. By modifying file `endpoint/WebContent/WEB-INF/connection.properties'
charnik@1022 109 before building Strabon and executing the above command.
charnik@1022 110 2. After executing the above command, by visiting the following page by a
charnik@1022 111 browser: <http://localhost:8080/ChangeConnection>
charnik@1022 112
charnik@1022 113 * Strabon Endpoint Client
charnik@1022 114
charnik@1022 115 This is a Java client for interacting with Strabon Endpoint or any other
charnik@1022 116 SPARQL endpoint. It is packaged as a jar file and may be found under
charnik@1022 117 directory `endpoint-client/target/' with name
charnik@1022 118 `strabon-endpoint-client-${version}.jar'. This jar contains any dependencies
charnik@1022 119 to other code, so may copy and paste it to your project and start playing
charnik@1022 120 with the code immediately.
charnik@1022 121
charnik@1022 122 * Strabon script
charnik@1022 123
charnik@1022 124 The `strabon' script is located under the `scripts/' directory and it is the
charnik@1022 125 main command-line tool for interacting with Strabon. You may use it to store
charnik@1022 126 RDF data with geospatial information or query/update it using one of
charnik@1022 127 stSPARQL or GeoSPARQL query languages.
charnik@1022 128
charnik@1022 129 * Endpoint script
charnik@1022 130
charnik@1022 131 The `endpoint' script is located under the `scripts' directory and it is the
charnik@1022 132 main command-line tool for interacting with a `Strabon Endpoint'. You may
charnik@1022 133 use it to do any operation you would like to do with the `strabon' script
charnik@1022 134 above, but in contrast to the `strabon' script you need to have access to a
charnik@1022 135 Strabon endpoint. Of course, the `Strabon Endpoint Client' component above
charnik@1022 136 can be used as well as a command-line tool. At the time of writing, the
charnik@1022 137 `Strabon Endpoint Client' component supports only querying of RDF data with
charnik@1022 138 geospatial information.
charnik@1022 139
charnik@1022 140
charnik@211 141 Getting Started
charnik@211 142 ===============
charnik@211 143 To get started with Strabon please have a look at the tutorial for the stRDF
charnik@211 144 data model and stSPARQL query language, the User Guide, and the Developer Guide.
charnik@211 145
charnik@211 146 stRDF and stSPARQL tutorial
charnik@211 147 http://www.strabon.di.uoa.gr/files/stSPARQL_tutorial.pdf
charnik@211 148
kkyzir@800 149
kkyzir@800 150 stSPARQL Reference
kkyzir@800 151 ~~~~~~~~~~~~~~~~~~
kkyzir@800 152 The reference for the spatial and temporal extension functions defined in
kkyzir@800 153 stSPARQL can be found at http://www.strabon.di.uoa.gr/stSPARQL#spatial and
kkyzir@800 154 http://www.strabon.di.uoa.gr/stSPARQL#temporals respectively.
kkyzir@800 155
kkyzir@800 156
charnik@211 157 User Guide
charnik@211 158 ~~~~~~~~~~
charnik@211 159 Assuming that you are familiar with Maven, the following steps need to be
charnik@211 160 followed in order to use Strabon using Eclipse:
charnik@211 161
charnik@211 162 1. Install PostgreSQL from http://www.postgresql.org/download/. At the time of
charnik@211 163 this writing the latest PostgreSQL version is 9.1.
charnik@211 164 2. Install PostGIS from http://postgis.refractions.net/download/. At the time of
charnik@211 165 this writing we have tested Strabon with PostGIS 1.5.3.
charnik@211 166 3. Install Maven from http://maven.apache.org/download.html. At the time of this
charnik@211 167 writing the latest Maven version is 3.0.4.
charnik@211 168 4. Install Eclipse from http://www.eclipse.org/downloads/. At the time of this
charnik@211 169 writing the latest Eclipse version is 3.7.2.
charnik@211 170 5. Install the m2e plugin for Eclipse from http://www.eclipse.org/m2e/.
charnik@211 171 6. Install the MercurialEclipse plugin for Eclipse from
charnik@211 172 http://javaforge.com/project/HGE .
charnik@211 173 7. From Eclipse, go to File --> Import --> Mercurial --> Clone Existing
charnik@211 174 Mercurial Repository --> Next. In the URL textarea paste the following
charnik@211 175 URL: http://hg.strabon.di.uoa.gr/StrabonUser and then press Next --> Next -->
charnik@211 176 Finish. If you used the default settings, you should have a new project named
charnik@211 177 StrabonMain. Right click on the project and select Configure --> Convert to
charnik@211 178 Maven project. Eclipse will enable Maven dependency management for the
charnik@211 179 project, download any dependencies and build the project.
charnik@211 180
charnik@211 181
charnik@211 182 Storing stRDF graphs and evaluating stSPARQL queries
charnik@211 183 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
charnik@211 184 You can see some examples in the classes gr.uoa.di.strabon.example.PostgisExample
charnik@211 185 and gr.uoa.di.strabon.example.PostgisExample2.
charnik@211 186
kkyzir@954 187 Tuning PostgreSQL
kkyzir@954 188 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
kkyzir@954 189 The default settings of Postgres are rather conservative. As a result, parameter
kkyzir@954 190 tuning is neccessary for speeding up Postgres, therefore Strabon. If you are
kkyzir@954 191 using Strabon to compare its performance against your implementation of
kkyzir@954 192 stSPARQL/GeoSPARQL, you are *strongly* encouraged to contact us using the Strabon
kkyzir@954 193 Users mailing list for assistance on tuning Postgres.
kkyzir@954 194
kkyzir@954 195 You can follow the instructions below for tuning a Postgres server running on an
kkyzir@954 196 Ubuntu machine that is dedicated to PostgreSQL and Strabon.
kkyzir@954 197
kkyzir@954 198 1. Append the following text at the end of postgresql.conf.
kkyzir@954 199 *Uncomment* the appropriate lines.
kkyzir@954 200
kkyzir@954 201 ### RAM
kkyzir@954 202 ## 4 GB of RAM
kkyzir@954 203 #shared_buffers = 3GB
kkyzir@954 204 #effective_cache_size = 3GB
kkyzir@954 205 #maintenance_work_mem = 1GB
kkyzir@954 206 #work_mem = 2GB
kkyzir@954 207 ## 8 GB of RAM
kkyzir@954 208 #shared_buffers = 5GB
kkyzir@954 209 #effective_cache_size = 6GB
kkyzir@954 210 #maintenance_work_mem = 2GB
kkyzir@954 211 #work_mem = 5GB
kkyzir@954 212 ## 16 GB of RAM
kkyzir@954 213 #shared_buffers = 10GB
kkyzir@954 214 #effective_cache_size = 14GB
kkyzir@954 215 #maintenance_work_mem = 4GB
kkyzir@954 216 #work_mem = 10GB
kkyzir@954 217 ## 24 GB of RAM
kkyzir@954 218 #shared_buffers = 16GB
kkyzir@954 219 #effective_cache_size = 22GB
kkyzir@954 220 #maintenance_work_mem = 6GB
kkyzir@954 221 #work_mem = 15GB
kkyzir@954 222 ## 48 GB of RAM
kkyzir@954 223 #shared_buffers = 32GB
kkyzir@954 224 #effective_cache_size = 46GB
kkyzir@954 225 #maintenance_work_mem = 8GB
kkyzir@954 226 #work_mem = 30GB
kkyzir@954 227 ## 64 GB of RAM
kkyzir@954 228 # contact us to find out!
kkyzir@954 229 ### HD
kkyzir@954 230 ## RAID with ordinary 7.200 disks
kkyzir@954 231 #random_page_cost = 3.5 #3.0-3.5
kkyzir@954 232 ## High-End NAS/SAN
kkyzir@954 233 #random_page_cost = 2 #1.5-2.5
kkyzir@954 234 ## Amazon EBS/Heroku
kkyzir@954 235 #random_page_cost = 1.3 #1.1-2.0
kkyzir@954 236 ## SSD array
kkyzir@954 237 #random_page_cost = 2.0 #1.5-2.5
kkyzir@1147 238 ### Planner options
kkyzir@1147 239 # Increase the following values in order to avoid using the GEQO planner.
kkyzir@1147 240 # Small values (<8) reduce planning time but may produce inferior query plans
kkyzir@1147 241 #
kkyzir@1147 242 geqo_threshold = 15 # keep this value larger that the following two parameters
kkyzir@1147 243 from_collapse_limit = 14
kkyzir@1147 244 join_collapse_limit = 14
kkyzir@954 245 ### Misc
kkyzir@954 246 default_statistics_target = 10000
kkyzir@954 247 constraint_exclusion = on
kkyzir@954 248 checkpoint_completion_target = 0.9
kkyzir@954 249 wal_buffers = 32MB
kkyzir@954 250 checkpoint_segments = 64
kkyzir@954 251 ### Connections
kkyzir@954 252 max_connections = 10
kkyzir@954 253
kkyzir@954 254 2. Append the following lines at the end of /etc/sysctl.conf
kkyzir@954 255 *Uncomment* the appropriate lines.
kkyzir@954 256
kkyzir@954 257 ## 4 GB of RAM
kkyzir@954 258 #kernel.shmmax = 3758096384
kkyzir@954 259 #kernel.shmall = 3758096384
kkyzir@954 260 #kernel.shmmni = 4096
kkyzir@954 261 ## 8 GB of RAM
kkyzir@954 262 #kernel.shmmax = 5905580032
kkyzir@954 263 #kernel.shmall = 5905580032
kkyzir@954 264 #kernel.shmmni = 4096
kkyzir@954 265 ## 16 GB of RAM
kkyzir@954 266 #kernel.shmmax = 11274289152
kkyzir@954 267 #kernel.shmall = 11274289152
kkyzir@954 268 #kernel.shmmni = 4096
kkyzir@954 269 ## 24 GB of RAM
kkyzir@954 270 #kernel.shmmax = 17716740096
kkyzir@954 271 #kernel.shmall = 17716740096
kkyzir@954 272 #kernel.shmmni = 4096
kkyzir@954 273 ## 48 GB of RAM
kkyzir@954 274 #kernel.shmmax = 35433480192
kkyzir@954 275 #kernel.shmall = 35433480192
kkyzir@954 276 #kernel.shmmni = 4224
kkyzir@954 277 ## 64 GB of RAM
kkyzir@954 278 # contact us to find out!
kkyzir@954 279
charnik@969 280 3. Apply all changes by executing
kkyzir@954 281
kkyzir@954 282 $ sudo sysctl -p
kkyzir@954 283 $ sudo /etc/init.d/postgresql restart
kkyzir@954 284
kkyzir@954 285 4. Prepare for the next run by issuing the command
kkyzir@954 286
kkyzir@954 287 $ sudo -u postgres psql -c 'VACUUM ANALYZE;' db
kkyzir@954 288
kkyzir@954 289 or
kkyzir@954 290
kkyzir@954 291 $ psql -c 'VACUUM ANALYZE;' db
kkyzir@954 292
kkyzir@954 293 where db is the name of the Postgres database that Strabon will use.
kkyzir@954 294
charnik@211 295
charnik@211 296 Developer Guide
charnik@211 297 ~~~~~~~~~~~~~~~
charnik@211 298 Assuming that you are familiar with Maven, the following steps need to be
charnik@211 299 followed in order to use Strabon using Eclipse:
charnik@211 300
charnik@211 301 1. Install PostgreSQL from http://www.postgresql.org/download/. At the time of
charnik@211 302 this writing the latest PostgreSQL version is 9.1.
charnik@211 303 2. Install PostGIS from http://postgis.refractions.net/download/. At the time of
charnik@211 304 this writing we have tested Strabon with PostGIS 1.5.3.
charnik@211 305 3. Install Maven from http://maven.apache.org/download.html. At the time of this
charnik@211 306 writing the latest Maven version is 3.0.4.
charnik@211 307 4. Install Eclipse from http://www.eclipse.org/downloads/. At the time of this
charnik@211 308 writing the latest Eclipse version is 3.7.2.
charnik@211 309 5. Install the m2e plugin for Eclipse from http://www.eclipse.org/m2e/.
charnik@211 310 6. Install the MercurialEclipse plugin for Eclipse from
charnik@211 311 http://javaforge.com/project/HGE.
charnik@211 312 7. From Eclipse, go to File --> Import --> Mercurial --> Clone Existing
charnik@211 313 Mercurial Repository --> Next. In the URL textarea paste the following
charnik@211 314 URL: http://hg.strabon.di.uoa.gr/Strabon and then press Next --> Next -->
charnik@211 315 Finish. If you used the default settings, you should have a new project named
charnik@211 316 StrabonMain. Right click on the project and select Configure --> Convert to
charnik@211 317 Maven project. Eclipse will enable Maven dependency management for the
charnik@211 318 project, download any dependencies and build the project.
charnik@211 319
charnik@211 320
psmeros@993 321 Tester Guide
psmeros@993 322 ~~~~~~~~~~~~
psmeros@993 323 Assuming again that you are familiar with Maven and Junit these are the steps
psmeros@993 324 you need to follow to test the functionality of Strabon:
psmeros@993 325
psmeros@1031 326
psmeros@993 327 * Using Eclipse
psmeros@993 328
psmeros@993 329 If you want to create a new test:
psmeros@993 330
psmeros@993 331 1. Import Strabon into Eclipse as explained in the Developer Guide.
psmeros@1031 332 2. Go to strabon-testsuite project.
psmeros@1031 333 3. Create a new folder (Recommended folder name: <test's name>) and place inside the following files:
psmeros@1051 334 3.1. An ntriples or nquads file with the test dataset (with .nt or .nq extension).
psmeros@1051 335 3.2. Pairs of files with sparql test queries and expected test results in xml format.
psmeros@1051 336 Notice that each pair must have the same name and .rq extension for the queryFile and .srx extension for the resultsFile.
psmeros@1031 337 4. Create a test class that extends TemplateTest class.
psmeros@1079 338 5. If you have followed the recommendations the test is ready. If you have different names or location for your
psmeros@1079 339 files, insert them explicitly in the constructor of the class. WARNING: All prefixes must be placed in file "prefixes" so that
psmeros@1079 340 every time a namespace changes, we have to change it just once.
psmeros@1031 341
psmeros@1031 342 If you want to run a test:
psmeros@1031 343
psmeros@1031 344 1. Right-click on the test class.
psmeros@1031 345 2. Select "Run as JUnit Test".
psmeros@1031 346 3. Database properties are retrieved from database.properties file. If you want, you can change a property
psmeros@1051 347 "on the fly" with an environment variable.
psmeros@1031 348
psmeros@1031 349
psmeros@1031 350 * Command Line
psmeros@1031 351
psmeros@1031 352 If you want to run all the tests:
psmeros@1031 353
psmeros@1031 354 1. Go to Strabon directory (root directory of all the subprojects).
psmeros@1130 355 2. Run "mvn test -DskipTests=false".
psmeros@1031 356 3. Optionally you can pass an environment variable with "-DvariableName=variableValue".
psmeros@993 357
psmeros@993 358
psmeros@993 359 Storing stRDF graphs and evaluating stSPARQL queries
psmeros@993 360 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
charnik@211 361 You can see some examples in the classes
charnik@211 362 eu.earthobservatory.runtime.postgis.StoreOp and
charnik@211 363 eu.earthobservatory.runtime.postgis.QueryOp.
charnik@211 364
charnik@211 365
charnik@211 366 Download
charnik@211 367 ========
charnik@211 368 You can download the source code of the latest version of Strabon by accessing
charnik@211 369 our public mercurial repository located at http://hg.strabon.di.uoa.gr/Strabon.
charnik@211 370 You can find more information on how to use and extend Strabon at the Getting
charnik@211 371 Started section.
charnik@211 372
charnik@211 373
charnik@211 374 Publications
charnik@211 375 ============
charnik@211 376 You can learn about stRDF data model and stSPARQL query language employed in
charnik@211 377 Strabon by reading our tutorial under the Getting Started section and/or the
charnik@211 378 publications given on this page.
charnik@211 379
charnik@211 380 The current versions of stRDF and stSPARQL which are based on OGC standards are
charnik@211 381 presented in the following document:
charnik@554 382 * K. Kyzirakos, M. Karpathiotakis, and M. Koubarakis. Strabon: A Semantic
charnik@554 383 Geospatial DBMS. In Internatioanl Semantic Web Conference (ISWC'12). Boston,
charnik@554 384 USA, November 11-15, 2012.
charnik@554 385 [pdf: http://strabon.di.uoa.gr/files/strabon-iswc.pdf]
charnik@554 386
charnik@211 387 * Manolis Koubarakis, Kostis Kyzirakos, Babis Nikolaou, Michael Sioutis, and
charnik@211 388 Stavros Vassos. A data model and query language for an extension of RDF with
charnik@211 389 time and space. Deliverable D2.1, European ICT project TELEIOS, 2011.
charnik@211 390 [pdf: http://strabon.di.uoa.gr/files/deliv2-1-re-revised.pdf]
charnik@211 391
charnik@211 392 The initial versions of stRDF and stSPARQL that are based on constraint
charnik@211 393 databases are presented in the following publications:
charnik@211 394 * Manolis Koubarakis and Kostis Kyzirakos. Modeling and Querying Metadata in
charnik@211 395 the Semantic Sensor Web: the Model stRDF and the Query Language stSPARQL.
charnik@211 396 In 7th Extended Semantic Web Conference (ESWC 2010). Heraklion, Crete,
charnik@211 397 30 May - 03 June, 2010.
charnik@211 398 [pdf: http://strabon.di.uoa.gr/files/stSPARQL.pdf]
charnik@211 399
charnik@211 400 * Kostis Kyzirakos, Manos Karpathiotakis and Manolis Koubarakis. Developing
charnik@211 401 Registries for the Semantic Sensor Web using stRDF and stSPARQL (short
charnik@211 402 paper).
charnik@211 403 In Proceedings of 3rd International workshop on Semantic Sensor Networks
charnik@211 404 2010, in conjunction with ISWC 2010, November 2010, Shanghai, China.
charnik@211 405 [pdf: http://strabon.di.uoa.gr/files/strabon.pdf]
charnik@211 406
charnik@211 407 Applications of stRDF, stSPARQL, and the system Strabon are described here:
charnik@211 408 * Alasdair J. G. Gray, Raúl García-Castro, Kostis Kyzirakos, Manos
charnik@211 409 Karpathiotakis, Jean-Paul Calbimonte, Kevin Page, Jason Sadler, Alex
charnik@211 410 Frazer, Ixent Galpin, Alvaro A. A. Fernandes, Norman W. Paton, Oscar
charnik@211 411 Corcho, Manolis Koubarakis, David De Roure, Kirk Martinez and Asunción
charnik@211 412 Gómez-Pérez. A Semantically Enabled Service Architecture for Mashups over
charnik@211 413 Streaming and Stored Data. In 8th Extended Semantic Web Conference (ESWC
charnik@211 414 2011). Heraklion, Crete, May 20 - June 2, 2011.
charnik@211 415 [pdf: http://strabon.di.uoa.gr/files/Gray2011Architecture.pdf]
charnik@211 416
charnik@211 417 * A.J.G. Gray, J. Sadler, O. Kit, K. Kyzirakos, M. Karpathiotakis, J.-P.
charnik@211 418 Calbimonte, K. Page, R. García-Castro, A. Frazer, I. Galpin, A.A.A.
charnik@211 419 Fernandes, N.W. Paton, O. Corcho, M. Koubarakis, D.D. Roure, K. Martinez,
charnik@211 420 A. Gómez-Pérez. A Semantic Sensor Web for Environmental Decision Support
charnik@211 421 Applications. Sensors. 11, 8855-8887.
charnik@211 422 [pdf: http://strabon.di.uoa.gr/files/sensors-11-08855.pdf]
charnik@211 423
charnik@211 424 Coming up soon:
charnik@211 425 Strabon will soon support an extension of RDF for incomplete geospatial
charnik@211 426 information. The following publication gives a preview of the relevant research
charnik@211 427 problems:
charnik@211 428 * M. Koubarakis, K. Kyzirakos, M. Karpathiotakis, C. Nikolaou, M. Sioutis,
charnik@211 429 S. Vassos, D. Michail, T. Herekakis, C. Kontoes and I. Papoutsis. Challenges
charnik@211 430 for Qualitative Spatial Reasoning in Linked Geospatial Data. In Proceedings
charnik@211 431 of IJCAI 2011 Workshop on Benchmarks and Applications of Spatial Reasoning,
charnik@211 432 Barcelona, Spain.
charnik@212 433 [pdf: http://www.earthobservatory.eu/publications/SciQL_ADASS2011.pdf]
charnik@211 434
charnik@812 435 * C. Nikolaou and M. Koubarakis: "Querying Linked Geospatial Data with
charnik@812 436 Incomplete Information". In 5th International Terra Cognita Workshop -
charnik@812 437 Foundations, Technologies and Applications of the Geospatial Web. In
charnik@812 438 conjunction with the 11th International Semantic Web Conference, Boston,
charnik@812 439 USA, November, 2012.
charnik@812 440 [http://www.earthobservatory.eu/publications/iswc-workshop.pdf]
charnik@812 441
charnik@211 442
charnik@211 443 Contributors
charnik@211 444 ============
charnik@211 445 The system Strabon has been developed by the following members of our team:
charnik@211 446
charnik@211 447 * Manos Karpathiotakis <mk@di.uoa.gr>
kostis@1319 448 * Kostis Kyzirakos <Kostis.Kyzirakos@cwi.nl>
charnik@211 449 * Manolis Koubarakis <koubarak@di.uoa.gr>
charnik@211 450 * Giorgos Garbis <ggarbis@di.uoa.gr>
charnik@211 451 * Konstantina Bereta <konstantina.bereta@di.uoa.gr>
kkyzir@639 452 * Charalampos Nikolaou <charnik@di.uoa.gr>
kkyzir@639 453 * Stella Gianakopoulou <sgian@di.uoa.gr>
psmeros@1322 454 * Panayiotis Smeros <psmeros@di.uoa.gr>
kallirroi@902 455 * Kallirroi Dogani <kallirroi@di.uoa.gr>
charnik@211 456
charnik@211 457
charnik@211 458 Mailing-list
charnik@211 459 ============
kkyzir@954 460 Currently, we maintain the following mailing lists:
kkyzir@954 461
kkyzir@954 462 * Strabon-users, is used as a communication channel for Strabon users.
kkyzir@954 463 To subscribe to the mailing-list, please visit page
kkyzir@954 464 http://cgi.di.uoa.gr/~mailman/listinfo/strabon-users. To post e-mails
kkyzir@954 465 to Strabon-users mailing-list, write to strabon-users@di.uoa.gr.
kkyzir@954 466
kkyzir@954 467 * Strabon-devel, is used as a communication channel with the developers
kkyzir@954 468 of Strabon. To subscribe to the mailing-list, please visit page
kkyzir@954 469 http://cgi.di.uoa.gr/~mailman/listinfo/strabon-devel. To post e-mails
kkyzir@954 470 to Strabon-devel mailing-list, write to strabon-devel@di.uoa.gr.
charnik@211 471
charnik@211 472
charnik@211 473 Bugs
charnik@211 474 ====
charnik@211 475 Please report bugs to http://bug.strabon.di.uoa.gr/report or
charnik@211 476 the Strabon-devel mailing-list Strabon-devel@di.uoa.gr.
charnik@212 477
charnik@212 478
sgian@627 479 Known Issues
sgian@627 480 ============
charnik@846 481 * By default, Tomcat uses ISO-8859-1 character encoding when decoding URLs received
charnik@846 482 from a browser. This can cause problems when encoding is UTF-8, and you are using
charnik@846 483 international characters. In order to fix this, edit conf/server.xml and find the
charnik@846 484 line where the Connector is defined. Add the parameter URIEncoding and set it to
charnik@846 485 UTF-8. For example:
sgian@627 486
charnik@846 487 <Connector port="8080" protocol="HTTP/1.1"
charnik@846 488 connectionTimeout="20000"
charnik@846 489 URIEncoding="UTF-8"
charnik@846 490 redirectPort="8443" />
charnik@846 491
charnik@846 492 * Building and executing any maven goals fails for maven versions <3.0 due to a
charnik@846 493 dependency to the `shade' plugin that is available only for maven version 3.0
charnik@846 494 (http://maven.apache.org/plugins/maven-shade-plugin/). In such systems, you may
charnik@846 495 disable execution of this plugin by setting the environmental variable
charnik@846 496 `shade.skip'. For example, to build Strabon using maven version 2.0 you may
charnik@846 497 execute the following command:
charnik@846 498
charnik@846 499 $ mvn clean package -Dshade.skip
sgian@627 500
sgian@967 501 * When using MonetDB as a backend, the following source code of MonetDB must be
sgian@967 502 used:
sgian@967 503 https://hg.strabon.di.uoa.gr/MonetDB/
sgian@967 504
sgian@627 505
charnik@212 506 License
charnik@212 507 =======
charnik@553 508 This Source Code Form is subject to the terms of the Mozilla Public
charnik@553 509 License, v. 2.0. If a copy of the MPL was not distributed with this
charnik@553 510 file, You can obtain one at http://mozilla.org/MPL/2.0/.
charnik@553 511
charnik@553 512 Copyright (C) 2010, 2011, 2012, Pyravlos Team
charnik@553 513
charnik@553 514 http://www.strabon.di.uoa.gr/
charnik@553 515
charnik@553 516
charnik@553 517 How to apply the license
charnik@553 518 ========================
charnik@866 519 * In the beginning of script files (after the shell directive) paste the
charnik@866 520 following statement:
charnik@553 521 #
charnik@553 522 # This Source Code Form is subject to the terms of the Mozilla Public
charnik@553 523 # License, v. 2.0. If a copy of the MPL was not distributed with this
charnik@553 524 # file, You can obtain one at http://mozilla.org/MPL/2.0/.
charnik@553 525 #
charnik@553 526 # Copyright (C) 2010, 2011, 2012, Pyravlos Team
charnik@553 527 #
charnik@553 528 # http://www.strabon.di.uoa.gr/
charnik@553 529 #
charnik@553 530
charnik@866 531 * In the beginning of Java source code files paste the following statement:
charnik@553 532 /**
charnik@553 533 * This Source Code Form is subject to the terms of the Mozilla Public
charnik@553 534 * License, v. 2.0. If a copy of the MPL was not distributed with this
charnik@553 535 * file, You can obtain one at http://mozilla.org/MPL/2.0/.
charnik@553 536 *
charnik@553 537 * Copyright (C) 2010, 2011, 2012, Pyravlos Team
charnik@553 538 *
charnik@553 539 * http://www.strabon.di.uoa.gr/
charnik@553 540 */
charnik@553 541
charnik@866 542 * In the beginning of HTML/XML files paste the following statement:
charnik@553 543 <!-- This Source Code Form is subject to the terms of the Mozilla Public
charnik@553 544 - License, v. 2.0. If a copy of the MPL was not distributed with this
charnik@553 545 - file, You can obtain one at http://mozilla.org/MPL/2.0/.
charnik@553 546 -
charnik@553 547 - Copyright (C) 2010, 2011, 2012, Pyravlos Team
charnik@553 548 -
charnik@553 549 - http://www.strabon.di.uoa.gr/
charnik@553 550 -->