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42 results about "Mobile mapping" patented technology

Mobile mapping is the process of collecting geospatial data from a mobile vehicle, typically fitted with a range of photographic, radar, laser, LiDAR or any number of remote sensing systems. Such systems are composed of an integrated array of time synchronised navigation sensors and imaging sensors mounted on a mobile platform. The primary output from such systems include GIS data, digital maps, and georeferenced images and video.

Method and apparatus for detecting objects from terrestrial based mobile mapping data

A method of detecting objects from terrestrial based mobile mapping data is disclosed, wherein the terrestrial based mobile mapping data has been captured by way of a terrestrial based mobile mapping vehicle driving on a road having a driving direction, the mobile mapping data including laser scanner data, source images obtained by at least one camera and position and orientation data of the vehicle, wherein the laser scanner data includes laser points, each laser point having associated position and orientation data, and each source image comprises associated position and orientation data. In at least one embodiment, the method includes: retrieving a position and orientation of the vehicle; filtering the laser scanner data in dependence of the position and orientation of the vehicle to obtain laser points corresponding to regions of interest; retrieving a source image associated with the position and orientation of the vehicle; mapping the laser points corresponding to regions of interest to image coordinates of the source image to generate a recognition mask; combining the recognition mask and the source image to obtain candidate 3D images representative of possible objects within the regions of interest; and, detecting a group of objects from the candidate 3D images. By combining image recognition and laser scanner recognition the detection rate can be increased to a very high percentage, thereby substantially reducing human effort. Furthermore, the generating of regions of interest in the laser data, enables a significant reduction of the processing power and / or the processing time needed to detect the objects in the images.
Owner:TOMTOM GLOBAL CONTENT

Method and apparatus for detecting objects from terrestrial based mobile mapping data

A method of detecting objects from terrestrial based mobile mapping data is disclosed, wherein the terrestrial based mobile mapping data has been captured by way of a terrestrial based mobile mapping vehicle driving on a road having a driving direction, the mobile mapping data including laser scanner data, source images obtained by at least one camera and position and orientation data of the vehicle, wherein the laser scanner data includes laser points, each laser point having associated position and orientation data, and each source image comprises associated position and orientation data. In at least one embodiment, the method includes: retrieving a position and orientation of the vehicle; filtering the laser scanner data in dependence of the position and orientation of the vehicle to obtain laser points corresponding to regions of interest; retrieving a source image associated with the position and orientation of the vehicle; mapping the laser points corresponding to regions of interest to image coordinates of the source image to generate a recognition mask; combining the recognition mask and the source image to obtain candidate 3D images representative of possible objects within the regions of interest; and, detecting a group of objects from the candidate 3D images. By combining image recognition and laser scanner recognition the detection rate can be increased to a very high percentage, thereby substantially reducing human effort. Furthermore, the generating of regions of interest in the laser data, enables a significant reduction of the processing power and / or the processing time needed to detect the objects in the images.
Owner:TOMTOM GLOBAL CONTENT

Multi-dimensional information synchronous acquiring, positioning and position service device as well as system and method

The invention belongs to the fields of navigational positioning and position service, and discloses a multi-dimensional information synchronous acquiring, positioning and position service device as well as system and method. Multi-dimensional information data which comprises a navigational and position service map, indoor space environment information and geographic position reference thereof needed for indoor navigation and position service as well as ubiquitous positioning signal data and geographic position marking thereof needed for indoor positioning are synchronously acquired and generated, geographical distribution of ubiquitous positioning signal feature is reconstructed or a spatial position of a signal source is calculated, so that an indoor ubiquitous positioning base information database is constructed, and therefore, a complete technical scheme for indoor navigation and position service application construction, deployment, maintenance and updating for a mobile phone or other mobile equipment is provided. The mobile mapping technology and method improves operation efficiency of a navigation and position service data acquisition site, has high usability, and remarkablyreduces data acquisition, application maintenance and updating cost.
Owner:WUHAN UNIV

Vehicle-mounted mobile mapping device

The invention discloses a vehicle-mounted mobile mapping device which comprises a transport platform system, a driving system, an inertial navigation system, a three-dimensional data acquisition system, a communication system and an upper computer, wherein the three-dimensional data acquisition system is utilized for acquiring polar radius information of the surface of a scene, and the transport platform system is applied to carrying the whole device; the device is controlled by the driving system to move in the scene; the inertial navigation system is used for getting spatial six-degree-of-freedom position and attitude parameters of the device; the communication system is applied to transmit the position and attitude parameters of the device, which are obtained by the inertial navigationsystem and the polar radius information of the scene, which is acquired by the three-dimensional data acquisition system to the upper computer in a real-time manner; and a three-dimensional point cloud image of the scene is reconstructed by processing polar radius of the scene and the information of the spatial six-degree-of-freedom position and attitude parameters of the device through software of the upper computer. The vehicle-mounted mobile mapping device disclosed by the invention can overcome the shortcomings of long production cycle of data, high production cost of the data, great difficulty in getting the effective data in places which can not be reached by staff and the like of a traditional measurement method and realize indoor and outdoor fast and accurate mapping, and further has broad application prospects in the fields of urban planning, reconstruction of accident scenes, archeology and the like.
Owner:BEIHANG UNIV

Method for identifying well lid part in streetscape image of mobile mapping system

The invention discloses a method for identifying a well lid part in a streetscape image of a mobile mapping system. The method comprises the steps of reading image data and obtaining image parameters; preprocessing an image and enhancing edge features in the image; performing edge detection on the preprocessed image by utilizing a weighted vector edge detection method, and obtaining an edge feature image; obtaining edge point sets based on the vector edge feature image, and extracting a vector contour link table corresponding to each edge point set; calculating all vector contour link tables one by one according to a determining criterion, resolving a suspected well lid elliptic equation coefficient by adopting a least square method, and controlling detection precision by utilizing a coefficient similarity threshold and a coefficient counter; and performing false ellipse removal according to geometric characteristics and/or position characteristics of the well lid in the streetscape image of the mobile mapping system. The invention aims to provide the method for identifying the well lid part in the streetscape image of the mobile mapping system, and the method is accurate in positioning and high in identification rate.
Owner:BEIJING UNIV OF CIVIL ENG & ARCHITECTURE

Method and device for obtaining conversion parameters, and mobile mapping system

ActiveCN107796370AImprove the efficiency of external calibrationSimple processPhotogrammetry/videogrammetryMobile mappingInertial navigation system
The embodiment of the invention provides a method and device for obtaining conversion parameters of a scanning measurement system coordinate system to an inertial navigation system coordinate system,and a mobile mapping system; the method comprises the steps: firstly, according to forecasted conversion parameters of the scanning measurement system coordinate system to the inertial navigation system coordinate system, and conversion parameters of the inertial navigation system coordinate system to a ground coordinate system, generating a pretreatment point cloud under the ground coordinate system; followed by obtaining coordinates of at least three selected calibration characteristic points in the ground coordinate system and corresponding coordinates in the pretreatment point cloud; and finally, according to the forecasted conversion parameters, the conversion parameters of the inertial navigation system coordinate system to the ground coordinate system and the coordinates of at leastthree selected calibration characteristic points in the ground coordinate system and the corresponding coordinates in the pretreatment point cloud, obtaining the conversion parameters of the scanningmeasurement system coordinate system to the inertial navigation system coordinate system. Accurate initial conversion parameters are not needed to obtain and the external calibration efficiency is improved.
Owner:NAVINFO

Adaptive correction method of vibration displacement errors of mobile mapping system

ActiveCN105588599AAccurate analysisCorrect vibration displacement errorInstrumentsTime domainMobile mapping
The invention relates to an adaptive correction method of vibration displacement errors of a mobile mapping system, and belongs to the technical field of spatial data collection and treatment. The adaptive correction method includes the following steps of: a) enhancing original vibration displacement data as a continuous time domain vibration displacement signal dependent on multiple variable mobile mapping environmental parameters; b) classifying and analyzing characteristic relations of each measurement environmental parameter variation and signal frequency domain distribution, the relations including the mapping relation of a measurement environmental parameter variation threshold and a signal frequency domain distribution scope, and the relation of a measurement environmental parameter variation trend and the frequency domain distribution width; c) using the parameter variation threshold mapping relation to dynamically and adaptively divide the continuous time domain vibration displacement signal into signal time domain intervals with specific frequency domain distribution complexity; and d) using variation trend consistent relation to restrain a value range of internal detail level parameters, and executing vibration displacement error correction treatment in every time domain interval. The adaptive correction method of the vibration displacement errors of the mobile mapping system can solve the problem that the present signal treatment method cannot suit accurate error correction of the vibration displacement of the mobile mapping system under the complex mapping environment, and contributes to supporting the high precision mobile mapping data analysis.
Owner:SHENYANG INST OF APPL ECOLOGY CHINESE ACAD OF SCI
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