diff --git a/lib/libcommon/src/common.h b/lib/libcommon/src/common.h
index 1f81ec3..74a72cc 100644
--- a/lib/libcommon/src/common.h
+++ b/lib/libcommon/src/common.h
@@ -30,62 +30,62 @@
      *
      *  The _eratosthene-suite_ offers a front-end to the eratosthene indexation
      *  server implemented in the _liberatosthene_ library. It consists in a
-     *  softwares suite offering front-end solutions to the functionalities of
+     *  software suite offering front-end solutions to the functionalities of
      *  the eratosthene library.
      *
-     *  The principal software implements the server itself allowing to simply
-     *  create server instances and to maintain services. The suite also offers
-     *  a front-end software for the data injection in the available servers. It
-     *  also offers a graphical 4D solution allowing to browse the 4D earth
-     *  model offered by the available servers.
-     *  
-     *  In addition to the server, client data injection and the 4D graphical
-     *  client softwares, the suite also provides a tools allowing to massively
-     *  query 4D earth cells, following the _liberatosthene_ indexation
-     *  formalism, to build large 3D-raster datasets. Such datasets can be used
-     *  to train and validate machine learning algorithms working on 3D/4D
-     *  geographic information.
+     *  The principal software implements the server itself, allowing to simply
+     *  create server instances and to maintain network services. The suite also
+     *  offers a front-end software for the data injection in server instances.
+     *  It also offers a graphical 4D solution allowing to browse the 4D model
+     *  of Earth offered by servers.
      *
      *  \section project Eratosthene Project
      *
-     *  The Eratosthene Project was initially imagined to answer the question of
-     *  very large point-based models of cities and environments. Indeed,
-     *  mapping a whole city at the level of the centimetre induces very large
+     *  The Eratosthene Project was initially designed to address the challenge
+     *  of very large point-based models of cities and environments. Indeed,
+     *  mapping a whole city at the level of the centimeter induces very large
      *  and heavy models that are difficult to manipulate, explore and exploit.
      *  Moreover, considering the time dimension implies a quick increase of the
      *  size of the models, making them impossible to handle as a single and
      *  monolithic object.
      *
-     *  The Eratosthene Project is designed to answer this question by
-     *  implementing an space-time indexation formalism able to handle, store
-     *  and access very large 4D models of cities and environments. The
-     *  indexation formalism is used to implement a server able to manage, store
-     *  and broadcast very large 4D models distributed all over the earth
-     *  surface and covering large period of time. In addition to the server,
-     *  the Eratosthene Project also implements a graphical client able to
-     *  communicate with the server and to offer a convenient way of browsing
-     *  the models in both space and time.
-
+     *  The Eratosthene Project is designed to provide a solution by considering
+     *  a space-time indexation formalism. This indexation formalism is used to
+     *  implement a server able to manage, store and broadcast over the network
+     *  very large 4D models distributed all over the earth surface and covering
+     *  large periods of time. In addition to the server, the Eratosthene
+     *  Project also implements a graphical client able to communicate with the
+     *  remote servers to offer a convenient way to browse the models in both
+     *  space and time.
+     *
      *  The space-time indexation formalism is designed to efficiently manage
-     *  the storage of the incoming 4D models and to offer and simple and
-     *  efficient ways of addressing queries to the server allowing models
+     *  the storage of the incoming 4D models and to offer a simple and
+     *  efficient way of addressing queries to the server to allow models
      *  broadcasting. The space-time indexation also allows to perform queries
-     *  to the server in a intuitive way giving the possibility to both address
-     *  the questions of the earth structures level of detail and time
+     *  to the server in an intuitive way giving the possibility to both address
+     *  the challenge of the earth structures level of details and time
      *  management. This allows to explore the entire earth surface in terms of
      *  4D structures from large mountain chains in 2000 to very small details
      *  of cities in 1850.
      *
      *  The subsequent indexation formalism used to drive the storage and access
      *  of the data also naturally brings a standardised discretisation of space
-     *  and time. Models injected in the information system are then
-     *  standardised from both spatial and temporal point of view. This allows
-     *  the implementation of binary and logical operators when considering a
-     *  model at two different times. The operators allows to deduce a third
-     *  model providing a differential point of view of the two models separated
-     *  in time. The evolution of cities and environments can be enhanced and
-     *  analysed in an efficient way, opening the way to more advanced
-     *  geographic services.
+     *  and time. Point-based models injected in the Eratosthene information
+     *  system are then standardised from both spatial and temporal point of
+     *  views. This allows the implementation of binary and logical operators
+     *  when considering a model at two different times. The operators allow to
+     *  deduce a third model on the fly providing a differential point of view
+     *  of the two models separated in time. The evolution of cities and
+     *  environments can be enhanced and analysed in an efficient way, opening
+     *  the way to more advanced geographic services.
+     *
+     *  The ability of indexation formalism to consider polygonal models in
+     *  addition to large scale point-based models allows to enhance the
+     *  possibilities in terms of 4D geographic services. More than the
+     *  possibility to automatically manage the polygonal models level of
+     *  details and large scale display, the indexation formalism also allows
+     *  compositions on the fly of mixed models allowing to compare different
+     *  type of models, from lidar point-based models to land registers.
      *
      *  \section license Copyright and License
      *
@@ -94,7 +94,6 @@
      *
      *  This program is licensed under the terms of the GNU GPLv3.
      */
-
 /*
     header - inclusion guard
  */
diff --git a/src/eratosthene-address/src/eratosthene-address.h b/src/eratosthene-address/src/eratosthene-address.h
index 58f25b6..f5692e0 100644
--- a/src/eratosthene-address/src/eratosthene-address.h
+++ b/src/eratosthene-address/src/eratosthene-address.h
@@ -30,62 +30,62 @@
      *
      *  The _eratosthene-suite_ offers a front-end to the eratosthene indexation
      *  server implemented in the _liberatosthene_ library. It consists in a
-     *  softwares suite offering front-end solutions to the functionalities of
+     *  software suite offering front-end solutions to the functionalities of
      *  the eratosthene library.
      *
-     *  The principal software implements the server itself allowing to simply
-     *  create server instances and to maintain services. The suite also offers
-     *  a front-end software for the data injection in the available servers. It
-     *  also offers a graphical 4D solution allowing to browse the 4D earth
-     *  model offered by the available servers.
-     *
-     *  In addition to the server, client data injection and the 4D graphical
-     *  client softwares, the suite also provides a tools allowing to massively
-     *  query 4D earth cells, following the _liberatosthene_ indexation
-     *  formalism, to build large 3D-raster datasets. Such datasets can be used
-     *  to train and validate machine learning algorithms working on 3D/4D
-     *  geographic information.
+     *  The principal software implements the server itself, allowing to simply
+     *  create server instances and to maintain network services. The suite also
+     *  offers a front-end software for the data injection in server instances.
+     *  It also offers a graphical 4D solution allowing to browse the 4D model
+     *  of Earth offered by servers.
      *
      *  \section project Eratosthene Project
      *
-     *  The Eratosthene Project was initially imagined to answer the question of
-     *  very large point-based models of cities and environments. Indeed,
-     *  mapping a whole city at the level of the centimetre induces very large
+     *  The Eratosthene Project was initially designed to address the challenge
+     *  of very large point-based models of cities and environments. Indeed,
+     *  mapping a whole city at the level of the centimeter induces very large
      *  and heavy models that are difficult to manipulate, explore and exploit.
      *  Moreover, considering the time dimension implies a quick increase of the
      *  size of the models, making them impossible to handle as a single and
      *  monolithic object.
      *
-     *  The Eratosthene Project is designed to answer this question by
-     *  implementing an space-time indexation formalism able to handle, store
-     *  and access very large 4D models of cities and environments. The
-     *  indexation formalism is used to implement a server able to manage, store
-     *  and broadcast very large 4D models distributed all over the earth
-     *  surface and covering large period of time. In addition to the server,
-     *  the Eratosthene Project also implements a graphical client able to
-     *  communicate with the server and to offer a convenient way of browsing
-     *  the models in both space and time.
-
+     *  The Eratosthene Project is designed to provide a solution by considering
+     *  a space-time indexation formalism. This indexation formalism is used to
+     *  implement a server able to manage, store and broadcast over the network
+     *  very large 4D models distributed all over the earth surface and covering
+     *  large periods of time. In addition to the server, the Eratosthene
+     *  Project also implements a graphical client able to communicate with the
+     *  remote servers to offer a convenient way to browse the models in both
+     *  space and time.
+     *
      *  The space-time indexation formalism is designed to efficiently manage
-     *  the storage of the incoming 4D models and to offer and simple and
-     *  efficient ways of addressing queries to the server allowing models
+     *  the storage of the incoming 4D models and to offer a simple and
+     *  efficient way of addressing queries to the server to allow models
      *  broadcasting. The space-time indexation also allows to perform queries
-     *  to the server in a intuitive way giving the possibility to both address
-     *  the questions of the earth structures level of detail and time
+     *  to the server in an intuitive way giving the possibility to both address
+     *  the challenge of the earth structures level of details and time
      *  management. This allows to explore the entire earth surface in terms of
      *  4D structures from large mountain chains in 2000 to very small details
      *  of cities in 1850.
      *
      *  The subsequent indexation formalism used to drive the storage and access
      *  of the data also naturally brings a standardised discretisation of space
-     *  and time. Models injected in the information system are then
-     *  standardised from both spatial and temporal point of view. This allows
-     *  the implementation of binary and logical operators when considering a
-     *  model at two different times. The operators allows to deduce a third
-     *  model providing a differential point of view of the two models separated
-     *  in time. The evolution of cities and environments can be enhanced and
-     *  analysed in an efficient way, opening the way to more advanced
-     *  geographic services.
+     *  and time. Point-based models injected in the Eratosthene information
+     *  system are then standardised from both spatial and temporal point of
+     *  views. This allows the implementation of binary and logical operators
+     *  when considering a model at two different times. The operators allow to
+     *  deduce a third model on the fly providing a differential point of view
+     *  of the two models separated in time. The evolution of cities and
+     *  environments can be enhanced and analysed in an efficient way, opening
+     *  the way to more advanced geographic services.
+     *
+     *  The ability of indexation formalism to consider polygonal models in
+     *  addition to large scale point-based models allows to enhance the
+     *  possibilities in terms of 4D geographic services. More than the
+     *  possibility to automatically manage the polygonal models level of
+     *  details and large scale display, the indexation formalism also allows
+     *  compositions on the fly of mixed models allowing to compare different
+     *  type of models, from lidar point-based models to land registers.
      *
      *  \section license Copyright and License
      *
@@ -95,7 +95,6 @@
      *  This program is licensed under the terms of the GNU GPLv3.
      */
 
-
 /*
     header - inclusion guard
  */
diff --git a/src/eratosthene-client/src/eratosthene-client.h b/src/eratosthene-client/src/eratosthene-client.h
index 0eebf91..d9fab8d 100644
--- a/src/eratosthene-client/src/eratosthene-client.h
+++ b/src/eratosthene-client/src/eratosthene-client.h
@@ -30,62 +30,62 @@
      *
      *  The _eratosthene-suite_ offers a front-end to the eratosthene indexation
      *  server implemented in the _liberatosthene_ library. It consists in a
-     *  softwares suite offering front-end solutions to the functionalities of
+     *  software suite offering front-end solutions to the functionalities of
      *  the eratosthene library.
      *
-     *  The principal software implements the server itself allowing to simply
-     *  create server instances and to maintain services. The suite also offers
-     *  a front-end software for the data injection in the available servers. It
-     *  also offers a graphical 4D solution allowing to browse the 4D Earth
-     *  model offered by the available servers.
-     *
-     *  In addition to the server, client data injection and the 4D graphical
-     *  client softwares, the suite also provides a tools allowing to massively
-     *  query 4D Earth cells, following the _liberatosthene_ indexation
-     *  formalism, to build large 3D-raster datasets. Such datasets can be used
-     *  to train and validate machine learning algorithms working on 3D/4D
-     *  geographic information.
+     *  The principal software implements the server itself, allowing to simply
+     *  create server instances and to maintain network services. The suite also
+     *  offers a front-end software for the data injection in server instances.
+     *  It also offers a graphical 4D solution allowing to browse the 4D model
+     *  of Earth offered by servers.
      *
      *  \section project Eratosthene Project
      *
-     *  The Eratosthene Project was initially imagined to answer the question of
-     *  very large point-based models of cities and environments. Indeed,
-     *  mapping a whole city at the level of the centimetre induces very large
+     *  The Eratosthene Project was initially designed to address the challenge
+     *  of very large point-based models of cities and environments. Indeed,
+     *  mapping a whole city at the level of the centimeter induces very large
      *  and heavy models that are difficult to manipulate, explore and exploit.
      *  Moreover, considering the time dimension implies a quick increase of the
      *  size of the models, making them impossible to handle as a single and
      *  monolithic object.
      *
-     *  The Eratosthene Project is designed to answer this question by
-     *  implementing an space-time indexation formalism able to handle, store
-     *  and access very large 4D models of cities and environments. The
-     *  indexation formalism is used to implement a server able to manage, store
-     *  and broadcast very large 4D models distributed all over the Earth
-     *  surface and covering large period of time. In addition to the server,
-     *  the Eratosthene Project also implements a graphical client able to
-     *  communicate with the server and to offer a convenient way of browsing
-     *  the models in both space and time.
-
+     *  The Eratosthene Project is designed to provide a solution by considering
+     *  a space-time indexation formalism. This indexation formalism is used to
+     *  implement a server able to manage, store and broadcast over the network
+     *  very large 4D models distributed all over the earth surface and covering
+     *  large periods of time. In addition to the server, the Eratosthene
+     *  Project also implements a graphical client able to communicate with the
+     *  remote servers to offer a convenient way to browse the models in both
+     *  space and time.
+     *
      *  The space-time indexation formalism is designed to efficiently manage
-     *  the storage of the incoming 4D models and to offer and simple and
-     *  efficient ways of addressing queries to the server allowing models
+     *  the storage of the incoming 4D models and to offer a simple and
+     *  efficient way of addressing queries to the server to allow models
      *  broadcasting. The space-time indexation also allows to perform queries
-     *  to the server in a intuitive way giving the possibility to both address
-     *  the questions of the Earth structures level of detail and time
-     *  management. This allows to explore the entire Earth surface in terms of
+     *  to the server in an intuitive way giving the possibility to both address
+     *  the challenge of the earth structures level of details and time
+     *  management. This allows to explore the entire earth surface in terms of
      *  4D structures from large mountain chains in 2000 to very small details
      *  of cities in 1850.
      *
      *  The subsequent indexation formalism used to drive the storage and access
      *  of the data also naturally brings a standardised discretisation of space
-     *  and time. Models injected in the information system are then
-     *  standardised from both spatial and temporal point of view. This allows
-     *  the implementation of binary and logical operators when considering a
-     *  model at two different times. The operators allows to deduce a third
-     *  model providing a differential point of view of the two models separated
-     *  in time. The evolution of cities and environments can be enhanced and
-     *  analysed in an efficient way, opening the way to more advanced
-     *  geographic services.
+     *  and time. Point-based models injected in the Eratosthene information
+     *  system are then standardised from both spatial and temporal point of
+     *  views. This allows the implementation of binary and logical operators
+     *  when considering a model at two different times. The operators allow to
+     *  deduce a third model on the fly providing a differential point of view
+     *  of the two models separated in time. The evolution of cities and
+     *  environments can be enhanced and analysed in an efficient way, opening
+     *  the way to more advanced geographic services.
+     *
+     *  The ability of indexation formalism to consider polygonal models in
+     *  addition to large scale point-based models allows to enhance the
+     *  possibilities in terms of 4D geographic services. More than the
+     *  possibility to automatically manage the polygonal models level of
+     *  details and large scale display, the indexation formalism also allows
+     *  compositions on the fly of mixed models allowing to compare different
+     *  type of models, from lidar point-based models to land registers.
      *
      *  \section license Copyright and License
      *
diff --git a/src/eratosthene-inject/src/eratosthene-inject.h b/src/eratosthene-inject/src/eratosthene-inject.h
index 7a5c7df..3075057 100644
--- a/src/eratosthene-inject/src/eratosthene-inject.h
+++ b/src/eratosthene-inject/src/eratosthene-inject.h
@@ -30,62 +30,62 @@
      *
      *  The _eratosthene-suite_ offers a front-end to the eratosthene indexation
      *  server implemented in the _liberatosthene_ library. It consists in a
-     *  softwares suite offering front-end solutions to the functionalities of
+     *  software suite offering front-end solutions to the functionalities of
      *  the eratosthene library.
      *
-     *  The principal software implements the server itself allowing to simply
-     *  create server instances and to maintain services. The suite also offers
-     *  a front-end software for the data injection in the available servers. It
-     *  also offers a graphical 4D solution allowing to browse the 4D earth
-     *  model offered by the available servers.
-     *
-     *  In addition to the server, client data injection and the 4D graphical
-     *  client softwares, the suite also provides a tools allowing to massively
-     *  query 4D earth cells, following the _liberatosthene_ indexation
-     *  formalism, to build large 3D-raster datasets. Such datasets can be used
-     *  to train and validate machine learning algorithms working on 3D/4D
-     *  geographic information.
+     *  The principal software implements the server itself, allowing to simply
+     *  create server instances and to maintain network services. The suite also
+     *  offers a front-end software for the data injection in server instances.
+     *  It also offers a graphical 4D solution allowing to browse the 4D model
+     *  of Earth offered by servers.
      *
      *  \section project Eratosthene Project
      *
-     *  The Eratosthene Project was initially imagined to answer the question of
-     *  very large point-based models of cities and environments. Indeed,
-     *  mapping a whole city at the level of the centimetre induces very large
+     *  The Eratosthene Project was initially designed to address the challenge
+     *  of very large point-based models of cities and environments. Indeed,
+     *  mapping a whole city at the level of the centimeter induces very large
      *  and heavy models that are difficult to manipulate, explore and exploit.
      *  Moreover, considering the time dimension implies a quick increase of the
      *  size of the models, making them impossible to handle as a single and
      *  monolithic object.
      *
-     *  The Eratosthene Project is designed to answer this question by
-     *  implementing an space-time indexation formalism able to handle, store
-     *  and access very large 4D models of cities and environments. The
-     *  indexation formalism is used to implement a server able to manage, store
-     *  and broadcast very large 4D models distributed all over the earth
-     *  surface and covering large period of time. In addition to the server,
-     *  the Eratosthene Project also implements a graphical client able to
-     *  communicate with the server and to offer a convenient way of browsing
-     *  the models in both space and time.
-
+     *  The Eratosthene Project is designed to provide a solution by considering
+     *  a space-time indexation formalism. This indexation formalism is used to
+     *  implement a server able to manage, store and broadcast over the network
+     *  very large 4D models distributed all over the earth surface and covering
+     *  large periods of time. In addition to the server, the Eratosthene
+     *  Project also implements a graphical client able to communicate with the
+     *  remote servers to offer a convenient way to browse the models in both
+     *  space and time.
+     *
      *  The space-time indexation formalism is designed to efficiently manage
-     *  the storage of the incoming 4D models and to offer and simple and
-     *  efficient ways of addressing queries to the server allowing models
+     *  the storage of the incoming 4D models and to offer a simple and
+     *  efficient way of addressing queries to the server to allow models
      *  broadcasting. The space-time indexation also allows to perform queries
-     *  to the server in a intuitive way giving the possibility to both address
-     *  the questions of the earth structures level of detail and time
+     *  to the server in an intuitive way giving the possibility to both address
+     *  the challenge of the earth structures level of details and time
      *  management. This allows to explore the entire earth surface in terms of
      *  4D structures from large mountain chains in 2000 to very small details
      *  of cities in 1850.
      *
      *  The subsequent indexation formalism used to drive the storage and access
      *  of the data also naturally brings a standardised discretisation of space
-     *  and time. Models injected in the information system are then
-     *  standardised from both spatial and temporal point of view. This allows
-     *  the implementation of binary and logical operators when considering a
-     *  model at two different times. The operators allows to deduce a third
-     *  model providing a differential point of view of the two models separated
-     *  in time. The evolution of cities and environments can be enhanced and
-     *  analysed in an efficient way, opening the way to more advanced
-     *  geographic services.
+     *  and time. Point-based models injected in the Eratosthene information
+     *  system are then standardised from both spatial and temporal point of
+     *  views. This allows the implementation of binary and logical operators
+     *  when considering a model at two different times. The operators allow to
+     *  deduce a third model on the fly providing a differential point of view
+     *  of the two models separated in time. The evolution of cities and
+     *  environments can be enhanced and analysed in an efficient way, opening
+     *  the way to more advanced geographic services.
+     *
+     *  The ability of indexation formalism to consider polygonal models in
+     *  addition to large scale point-based models allows to enhance the
+     *  possibilities in terms of 4D geographic services. More than the
+     *  possibility to automatically manage the polygonal models level of
+     *  details and large scale display, the indexation formalism also allows
+     *  compositions on the fly of mixed models allowing to compare different
+     *  type of models, from lidar point-based models to land registers.
      *
      *  \section license Copyright and License
      *
diff --git a/src/eratosthene-server/src/eratosthene-server.h b/src/eratosthene-server/src/eratosthene-server.h
index 4ace2b6..173c4e6 100644
--- a/src/eratosthene-server/src/eratosthene-server.h
+++ b/src/eratosthene-server/src/eratosthene-server.h
@@ -30,62 +30,62 @@
      *
      *  The _eratosthene-suite_ offers a front-end to the eratosthene indexation
      *  server implemented in the _liberatosthene_ library. It consists in a
-     *  softwares suite offering front-end solutions to the functionalities of
+     *  software suite offering front-end solutions to the functionalities of
      *  the eratosthene library.
      *
-     *  The principal software implements the server itself allowing to simply
-     *  create server instances and to maintain services. The suite also offers
-     *  a front-end software for the data injection in the available servers. It
-     *  also offers a graphical 4D solution allowing to browse the 4D earth
-     *  model offered by the available servers.
-     *
-     *  In addition to the server, client data injection and the 4D graphical
-     *  client softwares, the suite also provides a tools allowing to massively
-     *  query 4D earth cells, following the _liberatosthene_ indexation
-     *  formalism, to build large 3D-raster datasets. Such datasets can be used
-     *  to train and validate machine learning algorithms working on 3D/4D
-     *  geographic information.
+     *  The principal software implements the server itself, allowing to simply
+     *  create server instances and to maintain network services. The suite also
+     *  offers a front-end software for the data injection in server instances.
+     *  It also offers a graphical 4D solution allowing to browse the 4D model
+     *  of Earth offered by servers.
      *
      *  \section project Eratosthene Project
      *
-     *  The Eratosthene Project was initially imagined to answer the question of
-     *  very large point-based models of cities and environments. Indeed,
-     *  mapping a whole city at the level of the centimetre induces very large
+     *  The Eratosthene Project was initially designed to address the challenge
+     *  of very large point-based models of cities and environments. Indeed,
+     *  mapping a whole city at the level of the centimeter induces very large
      *  and heavy models that are difficult to manipulate, explore and exploit.
      *  Moreover, considering the time dimension implies a quick increase of the
      *  size of the models, making them impossible to handle as a single and
      *  monolithic object.
      *
-     *  The Eratosthene Project is designed to answer this question by
-     *  implementing an space-time indexation formalism able to handle, store
-     *  and access very large 4D models of cities and environments. The
-     *  indexation formalism is used to implement a server able to manage, store
-     *  and broadcast very large 4D models distributed all over the earth
-     *  surface and covering large period of time. In addition to the server,
-     *  the Eratosthene Project also implements a graphical client able to
-     *  communicate with the server and to offer a convenient way of browsing
-     *  the models in both space and time.
-
+     *  The Eratosthene Project is designed to provide a solution by considering
+     *  a space-time indexation formalism. This indexation formalism is used to
+     *  implement a server able to manage, store and broadcast over the network
+     *  very large 4D models distributed all over the earth surface and covering
+     *  large periods of time. In addition to the server, the Eratosthene
+     *  Project also implements a graphical client able to communicate with the
+     *  remote servers to offer a convenient way to browse the models in both
+     *  space and time.
+     *
      *  The space-time indexation formalism is designed to efficiently manage
-     *  the storage of the incoming 4D models and to offer and simple and
-     *  efficient ways of addressing queries to the server allowing models
+     *  the storage of the incoming 4D models and to offer a simple and
+     *  efficient way of addressing queries to the server to allow models
      *  broadcasting. The space-time indexation also allows to perform queries
-     *  to the server in a intuitive way giving the possibility to both address
-     *  the questions of the earth structures level of detail and time
+     *  to the server in an intuitive way giving the possibility to both address
+     *  the challenge of the earth structures level of details and time
      *  management. This allows to explore the entire earth surface in terms of
      *  4D structures from large mountain chains in 2000 to very small details
      *  of cities in 1850.
      *
      *  The subsequent indexation formalism used to drive the storage and access
      *  of the data also naturally brings a standardised discretisation of space
-     *  and time. Models injected in the information system are then
-     *  standardised from both spatial and temporal point of view. This allows
-     *  the implementation of binary and logical operators when considering a
-     *  model at two different times. The operators allows to deduce a third
-     *  model providing a differential point of view of the two models separated
-     *  in time. The evolution of cities and environments can be enhanced and
-     *  analysed in an efficient way, opening the way to more advanced
-     *  geographic services.
+     *  and time. Point-based models injected in the Eratosthene information
+     *  system are then standardised from both spatial and temporal point of
+     *  views. This allows the implementation of binary and logical operators
+     *  when considering a model at two different times. The operators allow to
+     *  deduce a third model on the fly providing a differential point of view
+     *  of the two models separated in time. The evolution of cities and
+     *  environments can be enhanced and analysed in an efficient way, opening
+     *  the way to more advanced geographic services.
+     *
+     *  The ability of indexation formalism to consider polygonal models in
+     *  addition to large scale point-based models allows to enhance the
+     *  possibilities in terms of 4D geographic services. More than the
+     *  possibility to automatically manage the polygonal models level of
+     *  details and large scale display, the indexation formalism also allows
+     *  compositions on the fly of mixed models allowing to compare different
+     *  type of models, from lidar point-based models to land registers.
      *
      *  \section license Copyright and License
      *