EP2181306A1 - Procede de simplification de l'affichage d'elements stationnaires d'une base de donnees embarquee - Google Patents
Procede de simplification de l'affichage d'elements stationnaires d'une base de donnees embarqueeInfo
- Publication number
- EP2181306A1 EP2181306A1 EP08803373A EP08803373A EP2181306A1 EP 2181306 A1 EP2181306 A1 EP 2181306A1 EP 08803373 A EP08803373 A EP 08803373A EP 08803373 A EP08803373 A EP 08803373A EP 2181306 A1 EP2181306 A1 EP 2181306A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- display
- grid
- database
- attributes
- relevant
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Ceased
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
- G01C23/00—Combined instruments indicating more than one navigational value, e.g. for aircraft; Combined measuring devices for measuring two or more variables of movement, e.g. distance, speed or acceleration
Definitions
- the present invention relates to a method for simplifying the display of stationary elements of an onboard database.
- the invention is in the field of the display on board an aircraft of the geostationary elements coming from a database on a screen having different display resolutions.
- the subject of the present invention is a method for simplifying the display of stationary elements of an on-board terrestrial database on an aircraft screen having different display resolutions with a view to this data display, which method can be implemented by requiring computing power that is the lowest possible.
- the method according to the invention is a method for simplifying the display on an aircraft screen of stationary elements of an on-board database relating to the terrestrial topography and having several different display resolutions, and it is characterized in that it consists in pre-calculating the elements necessary for a simplification of the display during the production process of the on-board database by associating with each fixed data item attributes indicating the display characteristics corresponding to each mode or range of display modes available, and to display when using the database only the stationary elements corresponding to the display mode used taking into account the corresponding attributes.
- the simplification of the display is a "clutter cleaning" consisting of displaying on the screen, for each display resolution, only the most relevant element distinguishable from the display. screen among a group of elements in a basic surface representative of the earth's surface.
- the criterion of relevance for each element and for each resolution is calculated by dividing the terrestrial globe into locally assumed flat rectangles, by applying to each rectangle a Cartesian grid oriented according to the terrestrial latitudes and longitudes, and by leaving in each rectangle of this grid only the most relevant obstacle.
- an isotropic cleaning step is carried out by marking as non-visible around each element the elements less relevant than it, thereby erasing the edge effects due to the cutting of the globe into rectangles.
- the most relevant element is marked as grouped.
- the calculation of the criterion of relevance comprises a step of associating other attributes with each fixed data item, these attributes being at least one of the following parameters relating to the fixed data item considered, when it is a fixed obstacle: altitude of its summit, height, volume, illumination.
- FIG. 1 is a simplified diagram showing how to establish a display density grid for the implementation of the method of the invention
- FIG. 2 is a simplified diagram showing the results of a first display simplification phase; according to the process according to the present invention
- Figure 3 is a simplified diagram showing the overall isotropic result of the implementation of the method of the invention.
- the method of the invention relates to the display on a display device having different display modes (different scales and resolutions) of data from an on-board database, which can be both natural obstacles such as mountains, as human constructions or fixed data such as text or graphics, for example navigation tags or "waypoints", names of cities or airports. To simplify the description below, all these kinds of data will be referred to as the single term fixed data.
- the method of the invention is implemented during the production of the on-board terrestrial database, and consists first of all in pre-calculating the elements necessary for "clutter cleaning".
- the method of the invention consists in associating with each fixed data a pair of attributes (visible yes / no, grouped yes / no), and this for each resolution of planned display. These attributes result in a bit field indicating the type of display (type of symbol, presence or absence of symbol) corresponding to each display mode chosen by the user in flight.
- the pre-calculation step of the method of the invention consists, before the use on board of the terrestrial database, to complete its data as follows.
- it is necessary first to reference them with respect to the terrestrial surface.
- SB Small piece
- Each small piece (here referred to as SB for "Secondary Block”) can then be assumed to be flat, if it is small enough.
- the twelve pairs of attributes relating to each fixed data are called here
- the base also includes the type of obstacle (illuminated or not, what color of lighting, etc.). If the obstacle is marked “not visible”, it is not displayed. If marked as “visible”, the attributes include a "grouped or ungrouped” bit to decide whether to display the "illuminated isolated obstacle” or "most relevant obstacle groups” symbol. between two separately viewable obstacles is the result of the two clutter cleaning phases. This minimum distance depends on the values of the GRrD_xx_STEP and GRrD_xx_RADIUS_FILTER parameters explained below.
- the process of the invention essentially comprises two phases, as set forth below.
- the first phase consists in reducing the occupancy density of the grid by filling in the "visible / nonvisible” and "grouped / ungrouped" fields for each obstacle of the Earth before moving on to the second phase.
- this first phase consists in dividing the Earth according to a regular grid, such as that represented in dashed lines in FIG. 1.
- a regular grid such as that represented in dashed lines in FIG. 1.
- each rectangle of this grid or box only one obstacle (or other fixed element) is visualized ), namely the most relevant. If there are other obstacles (or fixed elements) in this box, assign the most significant obstacle the designation "grouped", and the other obstacles the designation "not visible”.
- the method of the invention treats the obstacles of each box one after the other.
- Lat_Offset_xx Dec (SBLat / ⁇ Lat_Grid_xx_Step) * ⁇ Lat_Grid_xx_Step lfSBLon> 0
- the "visible / not visible” bit of the formula "GRIDxx Display Type” is forced to: • 1 if the obstacle is the most relevant in the box defined by the intersection between the current SB and the rectangle : ( ⁇ Latitude_Grid_xx_Step, ⁇ Longitude_Grid_xx_Step)
- This second phase consists of performing an overall isotropic post-cleaning.
- this process is implemented as follows. - For each obstacle A of the database, such as:
Landscapes
- Engineering & Computer Science (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Aviation & Aerospace Engineering (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Processing Or Creating Images (AREA)
- Navigation (AREA)
- Controls And Circuits For Display Device (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR0706131A FR2920580B1 (fr) | 2007-08-31 | 2007-08-31 | Procede de simplification de l'affichage d'elements stationnaires d'une base de donnees embarquee |
| PCT/EP2008/061375 WO2009027498A1 (fr) | 2007-08-31 | 2008-08-29 | Procede de simplification de l'affichage d'elements stationnaires d'une base de donnees embarquee |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP2181306A1 true EP2181306A1 (fr) | 2010-05-05 |
Family
ID=39294116
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP08803373A Ceased EP2181306A1 (fr) | 2007-08-31 | 2008-08-29 | Procede de simplification de l'affichage d'elements stationnaires d'une base de donnees embarquee |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US8984416B2 (fr) |
| EP (1) | EP2181306A1 (fr) |
| CA (1) | CA2696322C (fr) |
| FR (1) | FR2920580B1 (fr) |
| WO (1) | WO2009027498A1 (fr) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2944130A1 (fr) | 2009-04-03 | 2010-10-08 | Thales Sa | Procede de determination des points caracteristiques d'un pont sur une carte d'aeroport |
| FR3086450B1 (fr) | 2018-09-25 | 2021-05-21 | Thales Sa | Procede et dispositif electronique de gestion de l'affichage d'une cartographie aeronautique, programme d'ordinateur et systeme d'affichage associes |
| CN109597415B (zh) * | 2018-12-06 | 2020-03-10 | 山东大学 | 基于月球表面安全着陆区的巡视器路径规划方法及系统 |
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2007
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-
2008
- 2008-08-29 US US12/674,812 patent/US8984416B2/en active Active
- 2008-08-29 EP EP08803373A patent/EP2181306A1/fr not_active Ceased
- 2008-08-29 CA CA2696322A patent/CA2696322C/fr not_active Expired - Fee Related
- 2008-08-29 WO PCT/EP2008/061375 patent/WO2009027498A1/fr not_active Ceased
Non-Patent Citations (2)
| Title |
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| None * |
| See also references of WO2009027498A1 * |
Also Published As
| Publication number | Publication date |
|---|---|
| US20100218114A1 (en) | 2010-08-26 |
| CA2696322A1 (fr) | 2009-03-05 |
| US8984416B2 (en) | 2015-03-17 |
| CA2696322C (fr) | 2016-11-01 |
| FR2920580A1 (fr) | 2009-03-06 |
| WO2009027498A1 (fr) | 2009-03-05 |
| FR2920580B1 (fr) | 2010-09-03 |
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