39 results about "Mercator projection" patented technology

The invention discloses a method for preventing boats from colliding, comprising the following steps: performing program initialization; reading information of any two boats, predicting the track of the boats; judging whether the predicted tracks of two boats intersect, if not, returning to step 2 to continue reading the information of any other two boats to predict the tracks of other boats, if yes, calculating the intersection point, and entering the next step; calculating the intersection point, and using a Mercator projection transformation formula to calculate the distance between the intersection boats and the intersection point and a time zone from the boats to the intersection point; judging whether the time zones of two boats have intersection, if not, returning to step 2 to continue reading the information of any other two boats to predict the tracks of other boats; if yes, entering the next step; and giving alarms. The invention uses the Mercator projection transformation, which ensures that the distance between any two points is more accurate and prediction results are more correct; in addition, the invention adopts the judging method of the time zone, which can comprehensively predict time for boats to travel to a designated site, so that the reliability of the prediction result can be improved.

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.

The invention discloses a power grid geographical wiring diagram automatic generation method and device, and the method comprises the steps of carrying out the initial layout and local offset of all A-class along distribution units and B-class along distribution units, and obtaining all node equipment layout diagrams of the A-class along distribution units and the B-class along distribution units under a rectangular coordinate system; for the layout of the line equipment in all the A-type along cloth units and the B-type along cloth units under the rectangular coordinate system, obtaining all line equipment layout diagrams; combining the line equipment layout diagram with the node equipment layout diagram to form a power grid layout diagram; converting rectangular coordinates of the node devices and the line devices in the power grid layout diagram into geographic coordinates through Mercator projection, marking the node devices and the line devices on a geographic map according to the converted geographic coordinates, and finishing automatic generation of the power grid geographic wiring diagram. According to the a power grid geographical wiring diagram automatic generation method and device, the mapping efficiency and the equipment identification degree in the diagram are remarkably improved, and the method and device can be used for businesses such as power grid equipment management, operation and maintenance and the like.

The invention discloses a virtual parcel block chain data management method based on Mercator projection. The method comprises the steps of projecting an earth surface to a plane-coordinate system asrequired through a Mercator projection law, and dividing the projection into a plurality of rectangular small virtual parcels, and positioning the earth surface projection to the belonged small virtual parcel through any real latitude / longitude coordinate; the projection of the earth surface is managed by using the block chain, so that the centralization feature of the transaction data managementof the virtual parcel of the earth surface project is removed, and all nodes can possess effective accurate data and reach a consensus; even if the center server is subjected to the attack, the tampering and like devastating blow, the transaction data can be quickly retrieved; and the problem that the various data concurrency is increased since each node is connected with the server is greatly reduced.

A navigational plotter for use with a selected navigational chart and its method for production include providing a generally transparent elongated planar straight edge member having each of a first and a second straight edges parallelly disposed opposite one another bounding a generally rectangular interior surface. A printed central axis bisecting the rectangular interior surface and at least one compass rose arranged to have its North / South ordinal points to lie upon the printed central axis thus to allow the user to maintain orientation of the plotter on the chart. A first distance scale is calibrated in accord with the scale of the selected chart along a selected line of latitude. The first distance scale is printed to span the East / West ordinal points on the compass rose and along the first straight edge. A second distance scale is calibrated in accord with longitude according to a Mercator projection.

The invention discloses a method for calculating the risk degree of a ship hitting a bridge considering the scale of the ship. By establishing a plane rectangular coordinate system and using the Mercator projection method to convert the geographical position of the bridge and the ship according to the warning range of the bridge area, the rectangular coordinates are designed. The method of projecting the ship on the bridge axis along the channel direction uses the distance between the projected point and the center point of the pier to construct the risk algorithm of ship collision with the bridge. This algorithm fully considers the influence of ship size on the risk of ship collision with bridge, and uses the geometric analysis method to obtain the risk interval of ship collision with bridge from the horizontal direction, so that the algorithm is more in line with the actual situation. , and further proposed an active early warning and prediction strategy for ship collision with bridges. Through the above early warning strategy, the accuracy of early warning can be improved, the reliability and practicability of the system can be improved, and the common safety of bridges and ships can be guaranteed.

The present application discloses a method and device for drawing a delivery area, wherein the method includes: using the Mercator projection method to convert the latitude and longitude coordinates of the delivery site into plane coordinates S 0 (x 0 ,y 0 ); According to the plane coordinate S 0 (x 0 ,y 0 ), the radius r of the preset delivery area and the preset boundary drop point number N, determine the plane coordinates of each drop point evenly distributed on the delivery area boundary of the delivery site; the plane coordinates of all the drop points The coordinates are converted into corresponding latitude and longitude coordinates; and the delivery area is identified on the map according to the latitude and longitude coordinates of all landing points. By adopting the present invention, the drawing efficiency of the distribution area can be effectively improved and the accuracy is high.

The invention provides a global map data storage and organization method and a calling method. The global map data storage and organization method includes the steps of projecting a global map to a global coordinate frame, establishing a global geographic grid frame according to the global coordinate frame, slicing the global map to obtain tile data corresponding to the global map, and packaging and storing the tile data according to the geographic grid frame. The calling method includes the steps of receiving a map displaying request carrying longitude and latitude coordinates and displayinggrades, determining tile packets corresponding to the longitude and latitude coordinates according to the longitude and latitude coordinates and the displaying grades, and obtaining the tile data corresponding to the longitude and latitude coordinates from the tile packets. The complete global map is established by means of the Mercator projection in low-latitude areas and the ortho-axis azimuth projection in high-longitude areas; when the packaged and stored tiles are called, the target tile packets are retrieved from a relatively small number of tile packets, then the target tile data is retrieved from the target tile packets, the time consumed for retrieval is short, and the calling speed and efficiency of mass tiles are improved.

The present invention proposes a large data analysis method for farmland areas based on satellite remote sensing images, which analyzes point and polygon overlay, line and polygon overlay, and layer overlay analysis through overlay analysis to form a map database; The spatial data in the data files, including point layer files, line layer files, and surface layer files, are released uniformly according to the Mercator projection to form a planar map database; the aggregation function is used to realize dynamic vector slicing of spatial data, and the planar map database Data information is encoded into vector slices, saved as vector block data of various scales, forming a vector slice map; the front end displays the vector slice map, and provides catalog and metadata services, map services, feature services, image services, and 3D maps Service, place name address service and spatial data service to support the application of big data in farmland areas.

The present invention disclose a trajectory similarity calculation method. The steps are as follows: 1. Collect user time and space data through the user handheld GPS device, and take two trajectory R and SThe coordinate system, and use the Karman filtering algorithm to filter the trajectory data; 3. Bind the distance between the point and the distance between the point of the point of the two trajectory R and SEach point of each point in R and S is predicted;Follow; 7. Bybonize the results of step 6.The beneficial effect of the present invention is that it can reduce the effect of the trajectory sampling frequency on the accuracy of the algorithm and improve the accuracy of the simultaneous measurement algorithm of the trajectory.