Strabon

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author Kostis Kyzirakos <kostis@cwi.nl>
date Fri May 02 12:55:22 2014 +0200 (2014-05-02)
parents 079711dfc125
children 4b64f101eb0f
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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@1022 69 In case of an error during building of Strabon and assuming that the error does
charnik@1022 70 not come from the JUnit tests, please have a look at the `Known Issues' section
charnik@1022 71 below. If none of the known issues of that section applies, please contact the
charnik@1022 72 developers through the Strabon mailing-list or submit a corresponding bug
charnik@1022 73 (see `Bugs' section below).
charnik@1022 74
charnik@1022 75 After you have successfully built Strabon, you have access to the following
charnik@1022 76 components:
charnik@1022 77
charnik@1022 78 * Strabon Endpoint
charnik@1022 79
charnik@1022 80 This is a SPARQL endpoint for Strabon. It is distributed as a war file so
charnik@1022 81 you may deploy it in a Tomcat container. You may find the war file under
charnik@1022 82 directory `endpoint/target'.
charnik@1022 83
charnik@1022 84 * Strabon Endpoint (standalone)
charnik@1022 85
charnik@1022 86 This is a SPARQL endpoint for Strabon like the above one, but it differs
charnik@1022 87 only in that it does not require the user to have already set up a Tomcat
charnik@1022 88 container. The standalone Strabon Endpoint may be run by issuing the
charnik@1022 89 following command:
charnik@1022 90
charnik@1022 91 $ java -jar endpoint-exec/target/strabon-endpoint-executable-${version}.jar
charnik@1022 92
charnik@1022 93 After issuing the above command, you may access the Strabon Endpoint at
charnik@1022 94 the following URL: <http://localhost:8080/>.
charnik@1022 95
charnik@1022 96 Please see the page at <http://hg.strabon.di.uoa.gr/Strabon/rev/674f8f91162b>
charnik@1022 97 to find out other options that you may pass to the Tomcat container that
charnik@1022 98 will run by the above command.
charnik@1022 99
charnik@1022 100 SPECIAL NOTE: if you need to configure the connection details to the
charnik@1022 101 underlying database, you may do so in two ways:
charnik@1022 102 1. By modifying file `endpoint/WebContent/WEB-INF/connection.properties'
charnik@1022 103 before building Strabon and executing the above command.
charnik@1022 104 2. After executing the above command, by visiting the following page by a
charnik@1022 105 browser: <http://localhost:8080/ChangeConnection>
charnik@1022 106
charnik@1022 107 * Strabon Endpoint Client
charnik@1022 108
charnik@1022 109 This is a Java client for interacting with Strabon Endpoint or any other
charnik@1022 110 SPARQL endpoint. It is packaged as a jar file and may be found under
charnik@1022 111 directory `endpoint-client/target/' with name
charnik@1022 112 `strabon-endpoint-client-${version}.jar'. This jar contains any dependencies
charnik@1022 113 to other code, so may copy and paste it to your project and start playing
charnik@1022 114 with the code immediately.
charnik@1022 115
charnik@1022 116 * Strabon script
charnik@1022 117
charnik@1022 118 The `strabon' script is located under the `scripts/' directory and it is the
charnik@1022 119 main command-line tool for interacting with Strabon. You may use it to store
charnik@1022 120 RDF data with geospatial information or query/update it using one of
charnik@1022 121 stSPARQL or GeoSPARQL query languages.
charnik@1022 122
charnik@1022 123 * Endpoint script
charnik@1022 124
charnik@1022 125 The `endpoint' script is located under the `scripts' directory and it is the
charnik@1022 126 main command-line tool for interacting with a `Strabon Endpoint'. You may
charnik@1022 127 use it to do any operation you would like to do with the `strabon' script
charnik@1022 128 above, but in contrast to the `strabon' script you need to have access to a
charnik@1022 129 Strabon endpoint. Of course, the `Strabon Endpoint Client' component above
charnik@1022 130 can be used as well as a command-line tool. At the time of writing, the
charnik@1022 131 `Strabon Endpoint Client' component supports only querying of RDF data with
charnik@1022 132 geospatial information.
charnik@1022 133
charnik@1022 134
charnik@211 135 Getting Started
charnik@211 136 ===============
charnik@211 137 To get started with Strabon please have a look at the tutorial for the stRDF
charnik@211 138 data model and stSPARQL query language, the User Guide, and the Developer Guide.
charnik@211 139
charnik@211 140 stRDF and stSPARQL tutorial
charnik@211 141 http://www.strabon.di.uoa.gr/files/stSPARQL_tutorial.pdf
charnik@211 142
kkyzir@800 143
kkyzir@800 144 stSPARQL Reference
kkyzir@800 145 ~~~~~~~~~~~~~~~~~~
kkyzir@800 146 The reference for the spatial and temporal extension functions defined in
kkyzir@800 147 stSPARQL can be found at http://www.strabon.di.uoa.gr/stSPARQL#spatial and
kkyzir@800 148 http://www.strabon.di.uoa.gr/stSPARQL#temporals respectively.
kkyzir@800 149
kkyzir@800 150
charnik@211 151 User Guide
charnik@211 152 ~~~~~~~~~~
charnik@211 153 Assuming that you are familiar with Maven, the following steps need to be
charnik@211 154 followed in order to use Strabon using Eclipse:
charnik@211 155
charnik@211 156 1. Install PostgreSQL from http://www.postgresql.org/download/. At the time of
charnik@211 157 this writing the latest PostgreSQL version is 9.1.
charnik@211 158 2. Install PostGIS from http://postgis.refractions.net/download/. At the time of
charnik@211 159 this writing we have tested Strabon with PostGIS 1.5.3.
charnik@211 160 3. Install Maven from http://maven.apache.org/download.html. At the time of this
charnik@211 161 writing the latest Maven version is 3.0.4.
charnik@211 162 4. Install Eclipse from http://www.eclipse.org/downloads/. At the time of this
charnik@211 163 writing the latest Eclipse version is 3.7.2.
charnik@211 164 5. Install the m2e plugin for Eclipse from http://www.eclipse.org/m2e/.
charnik@211 165 6. Install the MercurialEclipse plugin for Eclipse from
charnik@211 166 http://javaforge.com/project/HGE .
charnik@211 167 7. From Eclipse, go to File --> Import --> Mercurial --> Clone Existing
charnik@211 168 Mercurial Repository --> Next. In the URL textarea paste the following
charnik@211 169 URL: http://hg.strabon.di.uoa.gr/StrabonUser and then press Next --> Next -->
charnik@211 170 Finish. If you used the default settings, you should have a new project named
charnik@211 171 StrabonMain. Right click on the project and select Configure --> Convert to
charnik@211 172 Maven project. Eclipse will enable Maven dependency management for the
charnik@211 173 project, download any dependencies and build the project.
charnik@211 174
charnik@211 175
charnik@211 176 Storing stRDF graphs and evaluating stSPARQL queries
charnik@211 177 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
charnik@211 178 You can see some examples in the classes gr.uoa.di.strabon.example.PostgisExample
charnik@211 179 and gr.uoa.di.strabon.example.PostgisExample2.
charnik@211 180
kkyzir@954 181 Tuning PostgreSQL
kkyzir@954 182 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
kkyzir@954 183 The default settings of Postgres are rather conservative. As a result, parameter
kkyzir@954 184 tuning is neccessary for speeding up Postgres, therefore Strabon. If you are
kkyzir@954 185 using Strabon to compare its performance against your implementation of
kkyzir@954 186 stSPARQL/GeoSPARQL, you are *strongly* encouraged to contact us using the Strabon
kkyzir@954 187 Users mailing list for assistance on tuning Postgres.
kkyzir@954 188
kkyzir@954 189 You can follow the instructions below for tuning a Postgres server running on an
kkyzir@954 190 Ubuntu machine that is dedicated to PostgreSQL and Strabon.
kkyzir@954 191
kkyzir@954 192 1. Append the following text at the end of postgresql.conf.
kkyzir@954 193 *Uncomment* the appropriate lines.
kkyzir@954 194
kkyzir@954 195 ### RAM
kkyzir@954 196 ## 4 GB of RAM
kkyzir@954 197 #shared_buffers = 3GB
kkyzir@954 198 #effective_cache_size = 3GB
kkyzir@954 199 #maintenance_work_mem = 1GB
kkyzir@954 200 #work_mem = 2GB
kkyzir@954 201 ## 8 GB of RAM
kkyzir@954 202 #shared_buffers = 5GB
kkyzir@954 203 #effective_cache_size = 6GB
kkyzir@954 204 #maintenance_work_mem = 2GB
kkyzir@954 205 #work_mem = 5GB
kkyzir@954 206 ## 16 GB of RAM
kkyzir@954 207 #shared_buffers = 10GB
kkyzir@954 208 #effective_cache_size = 14GB
kkyzir@954 209 #maintenance_work_mem = 4GB
kkyzir@954 210 #work_mem = 10GB
kkyzir@954 211 ## 24 GB of RAM
kkyzir@954 212 #shared_buffers = 16GB
kkyzir@954 213 #effective_cache_size = 22GB
kkyzir@954 214 #maintenance_work_mem = 6GB
kkyzir@954 215 #work_mem = 15GB
kkyzir@954 216 ## 48 GB of RAM
kkyzir@954 217 #shared_buffers = 32GB
kkyzir@954 218 #effective_cache_size = 46GB
kkyzir@954 219 #maintenance_work_mem = 8GB
kkyzir@954 220 #work_mem = 30GB
kkyzir@954 221 ## 64 GB of RAM
kkyzir@954 222 # contact us to find out!
kkyzir@954 223 ### HD
kkyzir@954 224 ## RAID with ordinary 7.200 disks
kkyzir@954 225 #random_page_cost = 3.5 #3.0-3.5
kkyzir@954 226 ## High-End NAS/SAN
kkyzir@954 227 #random_page_cost = 2 #1.5-2.5
kkyzir@954 228 ## Amazon EBS/Heroku
kkyzir@954 229 #random_page_cost = 1.3 #1.1-2.0
kkyzir@954 230 ## SSD array
kkyzir@954 231 #random_page_cost = 2.0 #1.5-2.5
kkyzir@1147 232 ### Planner options
kkyzir@1147 233 # Increase the following values in order to avoid using the GEQO planner.
kkyzir@1147 234 # Small values (<8) reduce planning time but may produce inferior query plans
kkyzir@1147 235 #
kkyzir@1147 236 geqo_threshold = 15 # keep this value larger that the following two parameters
kkyzir@1147 237 from_collapse_limit = 14
kkyzir@1147 238 join_collapse_limit = 14
kkyzir@954 239 ### Misc
kkyzir@954 240 default_statistics_target = 10000
kkyzir@954 241 constraint_exclusion = on
kkyzir@954 242 checkpoint_completion_target = 0.9
kkyzir@954 243 wal_buffers = 32MB
kkyzir@954 244 checkpoint_segments = 64
kkyzir@954 245 ### Connections
kkyzir@954 246 max_connections = 10
kkyzir@954 247
kkyzir@954 248 2. Append the following lines at the end of /etc/sysctl.conf
kkyzir@954 249 *Uncomment* the appropriate lines.
kkyzir@954 250
kkyzir@954 251 ## 4 GB of RAM
kkyzir@954 252 #kernel.shmmax = 3758096384
kkyzir@954 253 #kernel.shmall = 3758096384
kkyzir@954 254 #kernel.shmmni = 4096
kkyzir@954 255 ## 8 GB of RAM
kkyzir@954 256 #kernel.shmmax = 5905580032
kkyzir@954 257 #kernel.shmall = 5905580032
kkyzir@954 258 #kernel.shmmni = 4096
kkyzir@954 259 ## 16 GB of RAM
kkyzir@954 260 #kernel.shmmax = 11274289152
kkyzir@954 261 #kernel.shmall = 11274289152
kkyzir@954 262 #kernel.shmmni = 4096
kkyzir@954 263 ## 24 GB of RAM
kkyzir@954 264 #kernel.shmmax = 17716740096
kkyzir@954 265 #kernel.shmall = 17716740096
kkyzir@954 266 #kernel.shmmni = 4096
kkyzir@954 267 ## 48 GB of RAM
kkyzir@954 268 #kernel.shmmax = 35433480192
kkyzir@954 269 #kernel.shmall = 35433480192
kkyzir@954 270 #kernel.shmmni = 4224
kkyzir@954 271 ## 64 GB of RAM
kkyzir@954 272 # contact us to find out!
kkyzir@954 273
charnik@969 274 3. Apply all changes by executing
kkyzir@954 275
kkyzir@954 276 $ sudo sysctl -p
kkyzir@954 277 $ sudo /etc/init.d/postgresql restart
kkyzir@954 278
kkyzir@954 279 4. Prepare for the next run by issuing the command
kkyzir@954 280
kkyzir@954 281 $ sudo -u postgres psql -c 'VACUUM ANALYZE;' db
kkyzir@954 282
kkyzir@954 283 or
kkyzir@954 284
kkyzir@954 285 $ psql -c 'VACUUM ANALYZE;' db
kkyzir@954 286
kkyzir@954 287 where db is the name of the Postgres database that Strabon will use.
kkyzir@954 288
charnik@211 289
charnik@211 290 Developer Guide
charnik@211 291 ~~~~~~~~~~~~~~~
charnik@211 292 Assuming that you are familiar with Maven, the following steps need to be
charnik@211 293 followed in order to use Strabon using Eclipse:
charnik@211 294
charnik@211 295 1. Install PostgreSQL from http://www.postgresql.org/download/. At the time of
charnik@211 296 this writing the latest PostgreSQL version is 9.1.
charnik@211 297 2. Install PostGIS from http://postgis.refractions.net/download/. At the time of
charnik@211 298 this writing we have tested Strabon with PostGIS 1.5.3.
charnik@211 299 3. Install Maven from http://maven.apache.org/download.html. At the time of this
charnik@211 300 writing the latest Maven version is 3.0.4.
charnik@211 301 4. Install Eclipse from http://www.eclipse.org/downloads/. At the time of this
charnik@211 302 writing the latest Eclipse version is 3.7.2.
charnik@211 303 5. Install the m2e plugin for Eclipse from http://www.eclipse.org/m2e/.
charnik@211 304 6. Install the MercurialEclipse plugin for Eclipse from
charnik@211 305 http://javaforge.com/project/HGE.
charnik@211 306 7. From Eclipse, go to File --> Import --> Mercurial --> Clone Existing
charnik@211 307 Mercurial Repository --> Next. In the URL textarea paste the following
charnik@211 308 URL: http://hg.strabon.di.uoa.gr/Strabon and then press Next --> Next -->
charnik@211 309 Finish. If you used the default settings, you should have a new project named
charnik@211 310 StrabonMain. Right click on the project and select Configure --> Convert to
charnik@211 311 Maven project. Eclipse will enable Maven dependency management for the
charnik@211 312 project, download any dependencies and build the project.
charnik@211 313
charnik@211 314
psmeros@993 315 Tester Guide
psmeros@993 316 ~~~~~~~~~~~~
psmeros@993 317 Assuming again that you are familiar with Maven and Junit these are the steps
psmeros@993 318 you need to follow to test the functionality of Strabon:
psmeros@993 319
psmeros@1031 320
psmeros@993 321 * Using Eclipse
psmeros@993 322
psmeros@993 323 If you want to create a new test:
psmeros@993 324
psmeros@993 325 1. Import Strabon into Eclipse as explained in the Developer Guide.
psmeros@1031 326 2. Go to strabon-testsuite project.
psmeros@1031 327 3. Create a new folder (Recommended folder name: <test's name>) and place inside the following files:
psmeros@1051 328 3.1. An ntriples or nquads file with the test dataset (with .nt or .nq extension).
psmeros@1051 329 3.2. Pairs of files with sparql test queries and expected test results in xml format.
psmeros@1051 330 Notice that each pair must have the same name and .rq extension for the queryFile and .srx extension for the resultsFile.
psmeros@1031 331 4. Create a test class that extends TemplateTest class.
psmeros@1079 332 5. If you have followed the recommendations the test is ready. If you have different names or location for your
psmeros@1079 333 files, insert them explicitly in the constructor of the class. WARNING: All prefixes must be placed in file "prefixes" so that
psmeros@1079 334 every time a namespace changes, we have to change it just once.
psmeros@1031 335
psmeros@1031 336 If you want to run a test:
psmeros@1031 337
psmeros@1031 338 1. Right-click on the test class.
psmeros@1031 339 2. Select "Run as JUnit Test".
psmeros@1031 340 3. Database properties are retrieved from database.properties file. If you want, you can change a property
psmeros@1051 341 "on the fly" with an environment variable.
psmeros@1031 342
psmeros@1031 343
psmeros@1031 344 * Command Line
psmeros@1031 345
psmeros@1031 346 If you want to run all the tests:
psmeros@1031 347
psmeros@1031 348 1. Go to Strabon directory (root directory of all the subprojects).
psmeros@1130 349 2. Run "mvn test -DskipTests=false".
psmeros@1031 350 3. Optionally you can pass an environment variable with "-DvariableName=variableValue".
psmeros@993 351
psmeros@993 352
psmeros@993 353 Storing stRDF graphs and evaluating stSPARQL queries
psmeros@993 354 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
charnik@211 355 You can see some examples in the classes
charnik@211 356 eu.earthobservatory.runtime.postgis.StoreOp and
charnik@211 357 eu.earthobservatory.runtime.postgis.QueryOp.
charnik@211 358
charnik@211 359
charnik@211 360 Download
charnik@211 361 ========
charnik@211 362 You can download the source code of the latest version of Strabon by accessing
charnik@211 363 our public mercurial repository located at http://hg.strabon.di.uoa.gr/Strabon.
charnik@211 364 You can find more information on how to use and extend Strabon at the Getting
charnik@211 365 Started section.
charnik@211 366
charnik@211 367
charnik@211 368 Publications
charnik@211 369 ============
charnik@211 370 You can learn about stRDF data model and stSPARQL query language employed in
charnik@211 371 Strabon by reading our tutorial under the Getting Started section and/or the
charnik@211 372 publications given on this page.
charnik@211 373
charnik@211 374 The current versions of stRDF and stSPARQL which are based on OGC standards are
charnik@211 375 presented in the following document:
charnik@554 376 * K. Kyzirakos, M. Karpathiotakis, and M. Koubarakis. Strabon: A Semantic
charnik@554 377 Geospatial DBMS. In Internatioanl Semantic Web Conference (ISWC'12). Boston,
charnik@554 378 USA, November 11-15, 2012.
charnik@554 379 [pdf: http://strabon.di.uoa.gr/files/strabon-iswc.pdf]
charnik@554 380
charnik@211 381 * Manolis Koubarakis, Kostis Kyzirakos, Babis Nikolaou, Michael Sioutis, and
charnik@211 382 Stavros Vassos. A data model and query language for an extension of RDF with
charnik@211 383 time and space. Deliverable D2.1, European ICT project TELEIOS, 2011.
charnik@211 384 [pdf: http://strabon.di.uoa.gr/files/deliv2-1-re-revised.pdf]
charnik@211 385
charnik@211 386 The initial versions of stRDF and stSPARQL that are based on constraint
charnik@211 387 databases are presented in the following publications:
charnik@211 388 * Manolis Koubarakis and Kostis Kyzirakos. Modeling and Querying Metadata in
charnik@211 389 the Semantic Sensor Web: the Model stRDF and the Query Language stSPARQL.
charnik@211 390 In 7th Extended Semantic Web Conference (ESWC 2010). Heraklion, Crete,
charnik@211 391 30 May - 03 June, 2010.
charnik@211 392 [pdf: http://strabon.di.uoa.gr/files/stSPARQL.pdf]
charnik@211 393
charnik@211 394 * Kostis Kyzirakos, Manos Karpathiotakis and Manolis Koubarakis. Developing
charnik@211 395 Registries for the Semantic Sensor Web using stRDF and stSPARQL (short
charnik@211 396 paper).
charnik@211 397 In Proceedings of 3rd International workshop on Semantic Sensor Networks
charnik@211 398 2010, in conjunction with ISWC 2010, November 2010, Shanghai, China.
charnik@211 399 [pdf: http://strabon.di.uoa.gr/files/strabon.pdf]
charnik@211 400
charnik@211 401 Applications of stRDF, stSPARQL, and the system Strabon are described here:
charnik@211 402 * Alasdair J. G. Gray, Raúl García-Castro, Kostis Kyzirakos, Manos
charnik@211 403 Karpathiotakis, Jean-Paul Calbimonte, Kevin Page, Jason Sadler, Alex
charnik@211 404 Frazer, Ixent Galpin, Alvaro A. A. Fernandes, Norman W. Paton, Oscar
charnik@211 405 Corcho, Manolis Koubarakis, David De Roure, Kirk Martinez and Asunción
charnik@211 406 Gómez-Pérez. A Semantically Enabled Service Architecture for Mashups over
charnik@211 407 Streaming and Stored Data. In 8th Extended Semantic Web Conference (ESWC
charnik@211 408 2011). Heraklion, Crete, May 20 - June 2, 2011.
charnik@211 409 [pdf: http://strabon.di.uoa.gr/files/Gray2011Architecture.pdf]
charnik@211 410
charnik@211 411 * A.J.G. Gray, J. Sadler, O. Kit, K. Kyzirakos, M. Karpathiotakis, J.-P.
charnik@211 412 Calbimonte, K. Page, R. García-Castro, A. Frazer, I. Galpin, A.A.A.
charnik@211 413 Fernandes, N.W. Paton, O. Corcho, M. Koubarakis, D.D. Roure, K. Martinez,
charnik@211 414 A. Gómez-Pérez. A Semantic Sensor Web for Environmental Decision Support
charnik@211 415 Applications. Sensors. 11, 8855-8887.
charnik@211 416 [pdf: http://strabon.di.uoa.gr/files/sensors-11-08855.pdf]
charnik@211 417
charnik@211 418 Coming up soon:
charnik@211 419 Strabon will soon support an extension of RDF for incomplete geospatial
charnik@211 420 information. The following publication gives a preview of the relevant research
charnik@211 421 problems:
charnik@211 422 * M. Koubarakis, K. Kyzirakos, M. Karpathiotakis, C. Nikolaou, M. Sioutis,
charnik@211 423 S. Vassos, D. Michail, T. Herekakis, C. Kontoes and I. Papoutsis. Challenges
charnik@211 424 for Qualitative Spatial Reasoning in Linked Geospatial Data. In Proceedings
charnik@211 425 of IJCAI 2011 Workshop on Benchmarks and Applications of Spatial Reasoning,
charnik@211 426 Barcelona, Spain.
charnik@212 427 [pdf: http://www.earthobservatory.eu/publications/SciQL_ADASS2011.pdf]
charnik@211 428
charnik@812 429 * C. Nikolaou and M. Koubarakis: "Querying Linked Geospatial Data with
charnik@812 430 Incomplete Information". In 5th International Terra Cognita Workshop -
charnik@812 431 Foundations, Technologies and Applications of the Geospatial Web. In
charnik@812 432 conjunction with the 11th International Semantic Web Conference, Boston,
charnik@812 433 USA, November, 2012.
charnik@812 434 [http://www.earthobservatory.eu/publications/iswc-workshop.pdf]
charnik@812 435
charnik@211 436
charnik@211 437 Contributors
charnik@211 438 ============
charnik@211 439 The system Strabon has been developed by the following members of our team:
charnik@211 440
charnik@211 441 * Manos Karpathiotakis <mk@di.uoa.gr>
kostis@1319 442 * Kostis Kyzirakos <Kostis.Kyzirakos@cwi.nl>
charnik@211 443 * Manolis Koubarakis <koubarak@di.uoa.gr>
charnik@211 444 * Giorgos Garbis <ggarbis@di.uoa.gr>
charnik@211 445 * Konstantina Bereta <konstantina.bereta@di.uoa.gr>
kkyzir@639 446 * Charalampos Nikolaou <charnik@di.uoa.gr>
kkyzir@639 447 * Stella Gianakopoulou <sgian@di.uoa.gr>
kkyzir@639 448 * Panagiotis Smeros <psmeros@di.uoa.gr>
kallirroi@902 449 * Kallirroi Dogani <kallirroi@di.uoa.gr>
charnik@211 450
charnik@211 451
charnik@211 452 Mailing-list
charnik@211 453 ============
kkyzir@954 454 Currently, we maintain the following mailing lists:
kkyzir@954 455
kkyzir@954 456 * Strabon-users, is used as a communication channel for Strabon users.
kkyzir@954 457 To subscribe to the mailing-list, please visit page
kkyzir@954 458 http://cgi.di.uoa.gr/~mailman/listinfo/strabon-users. To post e-mails
kkyzir@954 459 to Strabon-users mailing-list, write to strabon-users@di.uoa.gr.
kkyzir@954 460
kkyzir@954 461 * Strabon-devel, is used as a communication channel with the developers
kkyzir@954 462 of Strabon. To subscribe to the mailing-list, please visit page
kkyzir@954 463 http://cgi.di.uoa.gr/~mailman/listinfo/strabon-devel. To post e-mails
kkyzir@954 464 to Strabon-devel mailing-list, write to strabon-devel@di.uoa.gr.
charnik@211 465
charnik@211 466
charnik@211 467 Bugs
charnik@211 468 ====
charnik@211 469 Please report bugs to http://bug.strabon.di.uoa.gr/report or
charnik@211 470 the Strabon-devel mailing-list Strabon-devel@di.uoa.gr.
charnik@212 471
charnik@212 472
sgian@627 473 Known Issues
sgian@627 474 ============
charnik@846 475 * By default, Tomcat uses ISO-8859-1 character encoding when decoding URLs received
charnik@846 476 from a browser. This can cause problems when encoding is UTF-8, and you are using
charnik@846 477 international characters. In order to fix this, edit conf/server.xml and find the
charnik@846 478 line where the Connector is defined. Add the parameter URIEncoding and set it to
charnik@846 479 UTF-8. For example:
sgian@627 480
charnik@846 481 <Connector port="8080" protocol="HTTP/1.1"
charnik@846 482 connectionTimeout="20000"
charnik@846 483 URIEncoding="UTF-8"
charnik@846 484 redirectPort="8443" />
charnik@846 485
charnik@846 486 * Building and executing any maven goals fails for maven versions <3.0 due to a
charnik@846 487 dependency to the `shade' plugin that is available only for maven version 3.0
charnik@846 488 (http://maven.apache.org/plugins/maven-shade-plugin/). In such systems, you may
charnik@846 489 disable execution of this plugin by setting the environmental variable
charnik@846 490 `shade.skip'. For example, to build Strabon using maven version 2.0 you may
charnik@846 491 execute the following command:
charnik@846 492
charnik@846 493 $ mvn clean package -Dshade.skip
sgian@627 494
sgian@967 495 * When using MonetDB as a backend, the following source code of MonetDB must be
sgian@967 496 used:
sgian@967 497 https://hg.strabon.di.uoa.gr/MonetDB/
sgian@967 498
sgian@627 499
charnik@212 500 License
charnik@212 501 =======
charnik@553 502 This Source Code Form is subject to the terms of the Mozilla Public
charnik@553 503 License, v. 2.0. If a copy of the MPL was not distributed with this
charnik@553 504 file, You can obtain one at http://mozilla.org/MPL/2.0/.
charnik@553 505
charnik@553 506 Copyright (C) 2010, 2011, 2012, Pyravlos Team
charnik@553 507
charnik@553 508 http://www.strabon.di.uoa.gr/
charnik@553 509
charnik@553 510
charnik@553 511 How to apply the license
charnik@553 512 ========================
charnik@866 513 * In the beginning of script files (after the shell directive) paste the
charnik@866 514 following statement:
charnik@553 515 #
charnik@553 516 # This Source Code Form is subject to the terms of the Mozilla Public
charnik@553 517 # License, v. 2.0. If a copy of the MPL was not distributed with this
charnik@553 518 # file, You can obtain one at http://mozilla.org/MPL/2.0/.
charnik@553 519 #
charnik@553 520 # Copyright (C) 2010, 2011, 2012, Pyravlos Team
charnik@553 521 #
charnik@553 522 # http://www.strabon.di.uoa.gr/
charnik@553 523 #
charnik@553 524
charnik@866 525 * In the beginning of Java source code files paste the following statement:
charnik@553 526 /**
charnik@553 527 * This Source Code Form is subject to the terms of the Mozilla Public
charnik@553 528 * License, v. 2.0. If a copy of the MPL was not distributed with this
charnik@553 529 * file, You can obtain one at http://mozilla.org/MPL/2.0/.
charnik@553 530 *
charnik@553 531 * Copyright (C) 2010, 2011, 2012, Pyravlos Team
charnik@553 532 *
charnik@553 533 * http://www.strabon.di.uoa.gr/
charnik@553 534 */
charnik@553 535
charnik@866 536 * In the beginning of HTML/XML files paste the following statement:
charnik@553 537 <!-- This Source Code Form is subject to the terms of the Mozilla Public
charnik@553 538 - License, v. 2.0. If a copy of the MPL was not distributed with this
charnik@553 539 - file, You can obtain one at http://mozilla.org/MPL/2.0/.
charnik@553 540 -
charnik@553 541 - Copyright (C) 2010, 2011, 2012, Pyravlos Team
charnik@553 542 -
charnik@553 543 - http://www.strabon.di.uoa.gr/
charnik@553 544 -->