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30 | 30 | *
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31 | 31 | * The _eratosthene-suite_ offers a front-end to the eratosthene indexation
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32 | 32 | * server implemented in the _liberatosthene_ library. It consists in a
|
33 |
| - * softwares suite offering front-end solutions to the functionalities of |
| 33 | + * software suite offering front-end solutions to the functionalities of |
34 | 34 | * the eratosthene library.
|
35 | 35 | *
|
36 |
| - * The principal software implements the server itself allowing to simply |
37 |
| - * create server instances and to maintain services. The suite also offers |
38 |
| - * a front-end software for the data injection in the available servers. It |
39 |
| - * also offers a graphical 4D solution allowing to browse the 4D Earth |
40 |
| - * model offered by the available servers. |
41 |
| - * |
42 |
| - * In addition to the server, client data injection and the 4D graphical |
43 |
| - * client softwares, the suite also provides a tools allowing to massively |
44 |
| - * query 4D Earth cells, following the _liberatosthene_ indexation |
45 |
| - * formalism, to build large 3D-raster datasets. Such datasets can be used |
46 |
| - * to train and validate machine learning algorithms working on 3D/4D |
47 |
| - * geographic information. |
| 36 | + * The principal software implements the server itself, allowing to simply |
| 37 | + * create server instances and to maintain network services. The suite also |
| 38 | + * offers a front-end software for the data injection in server instances. |
| 39 | + * It also offers a graphical 4D solution allowing to browse the 4D model |
| 40 | + * of Earth offered by servers. |
48 | 41 | *
|
49 | 42 | * \section project Eratosthene Project
|
50 | 43 | *
|
51 |
| - * The Eratosthene Project was initially imagined to answer the question of |
52 |
| - * very large point-based models of cities and environments. Indeed, |
53 |
| - * mapping a whole city at the level of the centimetre induces very large |
| 44 | + * The Eratosthene Project was initially designed to address the challenge |
| 45 | + * of very large point-based models of cities and environments. Indeed, |
| 46 | + * mapping a whole city at the level of the centimeter induces very large |
54 | 47 | * and heavy models that are difficult to manipulate, explore and exploit.
|
55 | 48 | * Moreover, considering the time dimension implies a quick increase of the
|
56 | 49 | * size of the models, making them impossible to handle as a single and
|
57 | 50 | * monolithic object.
|
58 | 51 | *
|
59 |
| - * The Eratosthene Project is designed to answer this question by |
60 |
| - * implementing an space-time indexation formalism able to handle, store |
61 |
| - * and access very large 4D models of cities and environments. The |
62 |
| - * indexation formalism is used to implement a server able to manage, store |
63 |
| - * and broadcast very large 4D models distributed all over the Earth |
64 |
| - * surface and covering large period of time. In addition to the server, |
65 |
| - * the Eratosthene Project also implements a graphical client able to |
66 |
| - * communicate with the server and to offer a convenient way of browsing |
67 |
| - * the models in both space and time. |
68 |
| -
|
| 52 | + * The Eratosthene Project is designed to provide a solution by considering |
| 53 | + * a space-time indexation formalism. This indexation formalism is used to |
| 54 | + * implement a server able to manage, store and broadcast over the network |
| 55 | + * very large 4D models distributed all over the earth surface and covering |
| 56 | + * large periods of time. In addition to the server, the Eratosthene |
| 57 | + * Project also implements a graphical client able to communicate with the |
| 58 | + * remote servers to offer a convenient way to browse the models in both |
| 59 | + * space and time. |
| 60 | + * |
69 | 61 | * The space-time indexation formalism is designed to efficiently manage
|
70 |
| - * the storage of the incoming 4D models and to offer and simple and |
71 |
| - * efficient ways of addressing queries to the server allowing models |
| 62 | + * the storage of the incoming 4D models and to offer a simple and |
| 63 | + * efficient way of addressing queries to the server to allow models |
72 | 64 | * broadcasting. The space-time indexation also allows to perform queries
|
73 |
| - * to the server in a intuitive way giving the possibility to both address |
74 |
| - * the questions of the Earth structures level of detail and time |
75 |
| - * management. This allows to explore the entire Earth surface in terms of |
| 65 | + * to the server in an intuitive way giving the possibility to both address |
| 66 | + * the challenge of the earth structures level of details and time |
| 67 | + * management. This allows to explore the entire earth surface in terms of |
76 | 68 | * 4D structures from large mountain chains in 2000 to very small details
|
77 | 69 | * of cities in 1850.
|
78 | 70 | *
|
79 | 71 | * The subsequent indexation formalism used to drive the storage and access
|
80 | 72 | * of the data also naturally brings a standardised discretisation of space
|
81 |
| - * and time. Models injected in the information system are then |
82 |
| - * standardised from both spatial and temporal point of view. This allows |
83 |
| - * the implementation of binary and logical operators when considering a |
84 |
| - * model at two different times. The operators allows to deduce a third |
85 |
| - * model providing a differential point of view of the two models separated |
86 |
| - * in time. The evolution of cities and environments can be enhanced and |
87 |
| - * analysed in an efficient way, opening the way to more advanced |
88 |
| - * geographic services. |
| 73 | + * and time. Point-based models injected in the Eratosthene information |
| 74 | + * system are then standardised from both spatial and temporal point of |
| 75 | + * views. This allows the implementation of binary and logical operators |
| 76 | + * when considering a model at two different times. The operators allow to |
| 77 | + * deduce a third model on the fly providing a differential point of view |
| 78 | + * of the two models separated in time. The evolution of cities and |
| 79 | + * environments can be enhanced and analysed in an efficient way, opening |
| 80 | + * the way to more advanced geographic services. |
| 81 | + * |
| 82 | + * The ability of indexation formalism to consider polygonal models in |
| 83 | + * addition to large scale point-based models allows to enhance the |
| 84 | + * possibilities in terms of 4D geographic services. More than the |
| 85 | + * possibility to automatically manage the polygonal models level of |
| 86 | + * details and large scale display, the indexation formalism also allows |
| 87 | + * compositions on the fly of mixed models allowing to compare different |
| 88 | + * type of models, from lidar point-based models to land registers. |
89 | 89 | *
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90 | 90 | * \section license Copyright and License
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91 | 91 | *
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