62 results about "Geographic coordinate conversion" patented technology

The invention discloses a design method of a ground station three-dimensional navigation map of a small unmanned air vehicle. The method comprises the steps of Google Earth application program interface (API)-based map data acquisition, geographical coordinate conversion and navigation function implementation. Network map data of a flight area can be stored into a local two-dimensional array by a Google Earth API; map data is drawn into a ground station navigation map area by a three-dimensional drawing interface, so that a three-dimensional map can be formed; flight destinations of the unmanned air vehicle are inquired in local map data and are drawn in the three-dimensional map, so that the three-dimensional map navigation function can be realized. By virtue of the method, the three-dimensional navigation map with low cost can be provided for a ground station of the small unmanned air vehicle, the map display intuition is improved, and the flight safety of the unmanned air vehicle can be improved under complex terrain conditions.

The invention relates to comprehensive geographical spatial data coordinate conversion method and system. The method comprises the following steps: setting a source coordinate format and a target coordinate format; setting a source coordinate system and a target coordinate system; selecting a conversion mode and a conversion model of coordinate conversion, and setting a conversion parameter of the coordinate conversion; inputting coordinate data of a known control point in the source coordinate system and the target coordinate system; calculating coordinate conversion parameters according to the coordinate data of the known control point; and converting the coordinate data of a to-be-converted point in the source coordinate system into the coordinate data of the target coordinate system according to the coordinate conversion parameters. The comprehensive geographical spatial data coordinate conversion method and system can be used for achieving space coordinate conversion between geographical spatial data with different formats and different coordinate forms, proportional scales and coordinate systems, achieving conversion and calculations such as projection and band change of geographical spatial data achievements between different coordinate systems, and achieving conversion parameter calculation and accuracy assessment; meanwhile, the input process of the coordinate data of the control point is simple; and the coordinate conversion efficiency is high.

The present invention provides a coastline area remote sensing map-based satellite borne spectrograph pointing registration method. According to the method, under a nadir observation mode, pointing registration is performed through using the characteristic that large-area uniform landforms exist in a special ground feature-coastline area in a high-and-middle-resolution remote sensing image and the characteristic that surface reflectance changes abruptly; the longitudes and latitudes of measurement points of a satellite borne spectrograph in an observation area are in one-to-one correspondence with the longitudes and latitudes of the pixels of a remote sensing image outputted by a remote sensing camera in a corresponding area; and the errors of the longitudes and latitudes of the measurement points and the longitudes and latitudes of the pixels are corrected, and are put into statistics and are monitored in real time. Arithmetic processing such as spectral data fitting and comparison and pixel grid geometric coordinate transformation is adopted; and a reference base map required by the pointing registration of the satellite borne spectrograph can come from other satellite loads, that is, the satellite borne spectrograph can be in non-rigid coaxial connection with the remote sensing camera, or the reference base map required by the pointing registration of the satellite borne spectrograph can come from different satellites, and thus the application range of the registration method of pointing between the non-imaging satellite spectrograph and the imaging remote sensing camera can be extended.

A method for customizing a local map with a grid that can be rotated and zoomed includes the steps of (a) defining a grid on a map; (b) generating a grid set-up data as a function the defined grid; and (c) employing a computer based device in a manner to receive the grid set-up data and convert a geographical coordinate to a local coordinate on the map. A device for such use includes a computer based device having a processor, a memory operably association with the processor, a power source, means for receiving a geographical coordinate; and geographical coordinate conversion software operably disposed in the memory and operably associated with the processor in a manner to in a manner to receive grid set-up data and convert the received geographical coordinate to a local coordinate on the map.

The invention relates to the Internet information processing field, and more particularly, to a map information display system based on asynchronous loading. The system comprises a customer end and a service end wherein the customer end is communicated and connected with the service end. The customer end realizes the display of target map information based on asynchronous loading. When the customer enters a target map information display page through the customer end, the default map information is displayed firstly, and then through threads, the geographic coordinate information, text information and picture information stored in a service end target are read. And on the basis of the already displayed map page, according to the coordinate position of the target, the position of the target is drawn together with words and picture information corresponding to the target. The system of the invention solves the problems that for synchronous display, too much memory has to be occupied, that the page refreshing efficiency is low, and that pictures are not smooth and continuous. Therefore, when pictures have to be switched, it can be done in a smooth and continuous manner. And the user's use experience is increased.

A method for editing composite geographical images, including importing a raster geographical map file, the raster file including geographical information identifying raster image data, global positioning reference data and a first projection that transforms geographical coordinates to linear coordinates, importing a vector geographical map file, the vector file including geographical information identifying vector objects, rendering a two-dimensional raster image including transforming linear coordinates to geographical coordinates according to the inverse of a prescribed second projection that transforms geographical coordinates to linear coordinates, and re-projecting the geographical coordinates to linear coordinates according to the first projection, rendering a two-dimensional vector image including projecting the vector objects according to the prescribed second projection, compositing the two-dimensional image raster image and the two-dimensional vector image as layers of a composite image, and editing the composite image. A system and a computer readable storage medium are also described and claimed.

The invention discloses a self-adaptive threshold compression ship track compression method which comprises the following specific steps: (1) data preprocessing: decoding a ship AIS (Automatic Identification System) of a water area and cleaning abnormal track points; (2) track point coordinate conversion: converting original geographic coordinates into Mercator projection; (3) calculating a point-to-line distance; (4) calculating an optimal threshold change rate; (5) calculating the threshold change rate of each track point; (6) compressing a single track; and (7) compressing all tracks. The method solves the problems that a traditional compression method is low in compression efficiency, poor in compression effect and even failed in compression, is only suitable for simultaneous compression of a single water area and is not suitable for simultaneous compression of multiple water areas, and has the advantages of being high in operation efficiency, stable in compression effect, free ofthreshold setting and the like.

A method for converting geographical space includes utilizing preposition process to device space information to be multiple geographic positions and converting its top point coordinate value for setting up a data table of geographic position containing code name and coordinate value of geographic position, substituting a point and judging geographic position range dropped in by the point and using voice or writing mode to replace drawing for presenting geographic position corresponded by the point correctly .

A device which converts geographic coordinates such as track logs to navigational routes matched to known road networks includes a GPS receiver; a display; and a processing system. The GPS receiver determines a series of geographic coordinates corresponding to points along a path traveled by a user of the device. The processing system accesses the series of geographic coordinates; compares them toa database of known paths to find a match; and displays at least a portion of the matching path along with navigational information which permits the user to generally follow the series of geographiccoordinates while traveling on the path.

The invention provides a twelve-phase permanent magnetic synchronous motor fault tolerance control method based on output maximum torque. The amplitude of each phase of current is severely unbalancedunder the fault tolerance control method where the copper loss of a stator is smallest, so output of the maximum torque is not ensured when the copper loss of the stator is smallest. The method comprises steps of (1) regarding n phases of motors into a whole, and dividing variables in the motor into two parts, wherein one part is arranged in the alpha-beta plane to participate in the electromechanical energy conversion and another part is in other planes to be irrelevant to the electromechanical energy conversion so as to establish a model of a twelve-phase permanent magnetic synchronous motor; (2) according to the rule that the total magnetic potential is unchanged, keeping the system decoupling conversion array to be unchanged so as to obtain an expression of rest each phase of the current under the maximum torque output mode during phase deficient operation of the twelve-phase motor; and (3) carrying out static coordinate conversion on the expression of each phase of the current, and calculating the volume of to-be-injected current of the corresponding harmonic wave sub-plane.

The invention discloses a method for accurately measuring the cross-span distance of an overhead power transmission line under complex conditions, which is characterized in that: method one includes the following steps: S01, two observation reference points are respectively selected vertically directly below the cross-cross line and the cross-over object, The two observation reference points of the intersecting line are numbered A and B from left to right, and the two observation reference points of the crossed object are numbered C and D from right to left. Let the theodolite position number be O point, A and B The crossing point between the connecting line and the connecting line C and D is point M; S02, establish a two-dimensional Cartesian coordinate system X0Y. The present invention provides a method for accurately measuring cross-span distances of overhead transmission lines under complex conditions. Through the principle of conversion from polar coordinates to rectangular coordinate systems and the principle of mutual conversion between different rectangular coordinate systems in the same plane, the cross-span orientation can be found and observed. To the cross-span point, realize the accurate measurement of the cross-span distance.

The invention discloses a design method of a ground station three-dimensional navigation map of a small unmanned air vehicle. The method comprises the steps of Google Earth application program interface (API)-based map data acquisition, geographical coordinate conversion and navigation function implementation. Network map data of a flight area can be stored into a local two-dimensional array by a Google Earth API; map data is drawn into a ground station navigation map area by a three-dimensional drawing interface, so that a three-dimensional map can be formed; flight destinations of the unmanned air vehicle are inquired in local map data and are drawn in the three-dimensional map, so that the three-dimensional map navigation function can be realized. By virtue of the method, the three-dimensional navigation map with low cost can be provided for a ground station of the small unmanned air vehicle, the map display intuition is improved, and the flight safety of the unmanned air vehicle can be improved under complex terrain conditions.

The invention relates to a recorder management platform-based acceleration coordinate conversion method and apparatus, and belongs to the field of electronic map vehicle position information processing. In order to overcome the shortcoming that the operation performance of a platform is seriously influenced when a quantity of received coordinate data is relatively large because the existing recorder management platform does not have a deviation value caching function, the recorder management platform-based acceleration coordinate conversion method and apparatus is proposed. The method comprises the steps of converting to-be-processed geographic coordinates into two-dimensional rectangular coordinates; according to given precision, performing grid division on a coordinate system; solving southwest point coordinates of a grid where the coordinates are located; and combining horizontal coordinates and longitudinal coordinates of the southwest point coordinates to form a character string, which serves as a KEY value, wherein the KEY value is used for representing the coordinates of the grid where the to-be-processed geographic coordinates are located. The method and the apparatus are suitable for electronic map positioning of the recorder management platform.