This proposed system is based on the following considerations:Ⅰ.Suitable projectionⅡ.Systematic indexⅢ.Facility of combiningⅣ.Easy referenceⅤ.Economic reproduction.Ⅰ.Suitable Projection.The Lambert Projection is...This proposed system is based on the following considerations:Ⅰ.Suitable projectionⅡ.Systematic indexⅢ.Facility of combiningⅣ.Easy referenceⅤ.Economic reproduction.Ⅰ.Suitable Projection.The Lambert Projection is selected because that:1.it is an orthomorphic projection and therefore in any small portion of a map,the shape of the topographic detail is preserved.展开更多
为了解决森林火灾、盗伐树木和伤害野生动物等林业管理方面的问题,设计了基于ROS的智能林业巡逻机器人。该机器人采用Raspberry Pi 4B作为主控、STM32F103RCT6拓展板作为辅控,主要硬件采用深度相机、激光雷达等,多种传感器协同对各种复...为了解决森林火灾、盗伐树木和伤害野生动物等林业管理方面的问题,设计了基于ROS的智能林业巡逻机器人。该机器人采用Raspberry Pi 4B作为主控、STM32F103RCT6拓展板作为辅控,主要硬件采用深度相机、激光雷达等,多种传感器协同对各种复杂环境进行环境感知。系统使用Ubuntu18.04,在电脑终端利用VNC远程控制平台对机器人进行操控。机器人具备自主巡逻、实时监控和物体识别等功能,并选用Cartographer建图算法进行自主导航,利用深度学习算法YOLOv4-tiny进行物体识别。实验测试结果表明,智能林业巡逻机器人运行稳定,可有效解决林业管理的问题,具有很高的实际应用价值。展开更多
The rapid development of Artificial Intelligence(AI)has profoundly reshaped numerous scientific and technological domains,including cartography and geographic information science[1].AI techniques—particularly deep le...The rapid development of Artificial Intelligence(AI)has profoundly reshaped numerous scientific and technological domains,including cartography and geographic information science[1].AI techniques—particularly deep learning and generative models—have exhibited significant potential in automating diverse cartographic processes,including design,visualization,generation,and application.Despite these advancements,challenges remain concerning AI’s interpretability and transparency,which are fundamental to the usability of maps.展开更多
This paper puts forword 11 cartographic generalization operator models and introduces their mathematical definitions,and thus a precise mathematical form and quantitative description has been given to these formerly l...This paper puts forword 11 cartographic generalization operator models and introduces their mathematical definitions,and thus a precise mathematical form and quantitative description has been given to these formerly limited qualitative concepts.The meaning of mathematical definition of operators for cartographic generalization and the application prospect in computer_aided cartography (CAC) is stated.ract The Jurassic strata in Jingyan of Sichuan containing the Mamenchinsaurus fauna are dealt with and divided in this paper. The Mamenchisaurus fossils contained there are compared in morphological features and stratigraphically with other types of the genus on by one. The comprehensive analysis show that the Mamenchisaurus fauna of Jingyan appeared in the early Late Jurassic and is primitive in morphology. The results of the morphological identification and stratigraphical study agree with each other. Their evolutionary processes in different apoches of the Late Jurassic also made clear. Key words Jingyan, Sichuan, Mamenchisaurus Fauna, stratigraphy, evolution展开更多
针对Cartographer算法在激光雷达的数据处理中存在的点云特征丢失的问题和低帧率激光雷达导致的运动畸变问题,提出一种改进激光同步定位与地图构建(simultaneous localization and mapping, SLAM)算法。采用k邻域搜索邻近点降采样的体...针对Cartographer算法在激光雷达的数据处理中存在的点云特征丢失的问题和低帧率激光雷达导致的运动畸变问题,提出一种改进激光同步定位与地图构建(simultaneous localization and mapping, SLAM)算法。采用k邻域搜索邻近点降采样的体素滤波方法代替Cartographer算法中的传统体素滤波方法,在不丢失点云特征的情况下提升计算速率;嵌入轮式里程计辅助模块去除激光雷达运动畸变,减少机器人的位姿累积误差,从而改善建图效果;最后,增加了边约束条件改善回环检测效果。通过在机器人操作系统中的gazebo搭建仿真环境进行模拟实验,对比两种算法,实验结果显示改进算法的建图轨迹误差更小。展开更多
文摘This proposed system is based on the following considerations:Ⅰ.Suitable projectionⅡ.Systematic indexⅢ.Facility of combiningⅣ.Easy referenceⅤ.Economic reproduction.Ⅰ.Suitable Projection.The Lambert Projection is selected because that:1.it is an orthomorphic projection and therefore in any small portion of a map,the shape of the topographic detail is preserved.
文摘为了解决森林火灾、盗伐树木和伤害野生动物等林业管理方面的问题,设计了基于ROS的智能林业巡逻机器人。该机器人采用Raspberry Pi 4B作为主控、STM32F103RCT6拓展板作为辅控,主要硬件采用深度相机、激光雷达等,多种传感器协同对各种复杂环境进行环境感知。系统使用Ubuntu18.04,在电脑终端利用VNC远程控制平台对机器人进行操控。机器人具备自主巡逻、实时监控和物体识别等功能,并选用Cartographer建图算法进行自主导航,利用深度学习算法YOLOv4-tiny进行物体识别。实验测试结果表明,智能林业巡逻机器人运行稳定,可有效解决林业管理的问题,具有很高的实际应用价值。
文摘The rapid development of Artificial Intelligence(AI)has profoundly reshaped numerous scientific and technological domains,including cartography and geographic information science[1].AI techniques—particularly deep learning and generative models—have exhibited significant potential in automating diverse cartographic processes,including design,visualization,generation,and application.Despite these advancements,challenges remain concerning AI’s interpretability and transparency,which are fundamental to the usability of maps.
文摘This paper puts forword 11 cartographic generalization operator models and introduces their mathematical definitions,and thus a precise mathematical form and quantitative description has been given to these formerly limited qualitative concepts.The meaning of mathematical definition of operators for cartographic generalization and the application prospect in computer_aided cartography (CAC) is stated.ract The Jurassic strata in Jingyan of Sichuan containing the Mamenchinsaurus fauna are dealt with and divided in this paper. The Mamenchisaurus fossils contained there are compared in morphological features and stratigraphically with other types of the genus on by one. The comprehensive analysis show that the Mamenchisaurus fauna of Jingyan appeared in the early Late Jurassic and is primitive in morphology. The results of the morphological identification and stratigraphical study agree with each other. Their evolutionary processes in different apoches of the Late Jurassic also made clear. Key words Jingyan, Sichuan, Mamenchisaurus Fauna, stratigraphy, evolution
文摘针对Cartographer算法在激光雷达的数据处理中存在的点云特征丢失的问题和低帧率激光雷达导致的运动畸变问题,提出一种改进激光同步定位与地图构建(simultaneous localization and mapping, SLAM)算法。采用k邻域搜索邻近点降采样的体素滤波方法代替Cartographer算法中的传统体素滤波方法,在不丢失点云特征的情况下提升计算速率;嵌入轮式里程计辅助模块去除激光雷达运动畸变,减少机器人的位姿累积误差,从而改善建图效果;最后,增加了边约束条件改善回环检测效果。通过在机器人操作系统中的gazebo搭建仿真环境进行模拟实验,对比两种算法,实验结果显示改进算法的建图轨迹误差更小。
