Trimble MX7移动测量系统精度影响因素分析

车载移动测量系统的测图精度受测量环境影响较大,而城市测量的环境一般较复杂,且环境对测量精度的影响程度并未明确,因此本文主要针对车辆在建筑物遮挡和拐弯两种情况下做了实验,同时对同一目标点的二维坐标和三维坐标进行了平面精度的对比,综合分析评价了Trimble MX7移动测量系统在实际应用中行驶轨迹精度和目标点位精度的变化情况。实验证明,轨迹拐弯处的点位精度比车辆直行时的点位精度差,但满足1∶1 000数字测图精度要求,在建筑遮挡最密集时点位精度最差但仍可应用于1∶1 000野外数字测图,直接对目标点的三维坐标进行提取的精度优于二维坐标提取方式,该测量系统可应用于1∶2 000野外数字测图的高程测量。     

线性MX链上的Peierls二聚化

从Ｂａｅｒｉｓｗｙｌ－Ｂｉｓｈｏｐ模型出发，研究了Ｍ离子（过渡金属离子）或Ｘ离子（卤素离子）的晶格位移对ＭＸ链的Ｐｅｉｅｒｌｓ二聚化的物理效应。结果表明，Ｘ离子较之于Ｍ离子更易于发生二聚化     

FLASH MX 在海洋预报网站的应用研究

通过MACROMEDIA STUDIO MX的FLASH MX工具软件的分析和研究,针对海洋领域的相关信息数据的特性,根据相关的海洋监测预报业务的专业需求,在搭建网站平台的同时,探讨了如何深层次地对FLASH MX开发功能的挖掘,在海洋信息应用领域率先提出了在海洋相关业务网站中建立RIA的理念和FLASHWEB的应用案例,继而在对FLASH应用前景的分析研究中也充分表述FLASHWEB在海洋领域的商业利用价值。     

RESOURCESAT-1 LISS-4 MX bands onground co-registration by in-flight calibration and attitude refinement

RESOURCESAT-1 satellite was launched in October of 2003. Since then it has been consistently providing high quality 5 m monochromatic and multispectral images of same resolution. LISS-4 MX sensor has complex acquisition geometry. It operates in three spectral bands imaged by 3 CCD arrays, which are separated by a finite time in imaging along the satellite track direction. Individual band data is acquired at different times while the satellite is driven by a pre-determined yaw profile. In addition, the odd–even pixels are too shifted by a small fixed delay in time. A unique challenge in LISS-4 MX Level-2 data processing sub-system is to autonomously rectify and additionally co-register the three bands data because of the influence of orbit and attitude in the time gap in the imaging sequence. In this paper, authors bring out details of in-flight calibration arrived for LISS-4 MX sensor. It addresses parameterization of co-registration problem by doing sensitivity analysis of the geometric model parameters to achieve co-registration among all bands. This approach can also be used for other sensor system having similar imaging geometry to achieve improved image co-registration among bands.     

线性MX络合物链的连续模型

从Ｂａｅｒｉｓｗｙｌ－Ｂｉｓｈｏｐ模型出发，导出了严格的ＭＸ络合物链的连续哈密顿量，得到一组电子波函数满足的方程。进一步严格地求出这组方程的解析解。在零级近似下，该解回到ＢＢ的简单扭折孤子解。文中采用的方法可推广到其他类似的系统     

Observations of the X-ray burster MX 0836-42 by the INTEGRAL and RXTE orbiting observatories

We present the results of our study of the emission from the transient burster MX 0836-42 using its observations by the INTEGRAL and RXTE X-ray and gamma-ray observatories in the period 2003–2004. The source’s broadband X-ray spectrum in the energy range 3–120 keV has been obtained and investigated for the first time. We have detected 39 X-ray bursts from this source. Their analysis shows that the maximum 3–20-keV flux varies significantly from burst to burst, F ～ (0.5–1.5) × 10^?8 erg cm^?2 s^?1. Using the flux at the maximum of the brightest detected burst, we determined an upper limit for the distance to the source, D ? 8 kpc.     

电视天气预报节目中常见天气示意图的动画制作

结合日常电视天气预报节目的情况,阐述动画在天气预报节目中的重要性,介绍如何用多媒体动画软件实现常见天气示意图,为天气预报节目制作人员日常动画制作提供参考。     

Assessment of digital camera-derived vegetation indices in quantitative monitoring of seasonal rice growth

A commercially available digital camera can be used in a low-cost automatic observation system for monitoring crop growth change in open-air fields. We developed a prototype Crop Phenology Recording System (CPRS) for monitoring rice growth, but the ready-made waterproof cases that we used produced shadows on the images. After modifying the waterproof cases, we repeated the fixed-point camera observations to clarify questions regarding digital camera-derived vegetation indices (VIs), namely, the visible atmospherically resistant index (VARI) based on daytime normal color images (RGB image) and the nighttime relative brightness index (NRBI_NIR) based on nighttime near infrared (NIR) images. We also took frequent measurements of agronomic data such as plant length, leaf area index (LAI), and aboveground dry matter weight to gain a detailed understanding of the temporal relationship between the VIs and the biophysical parameters of rice. In addition, we conducted another nighttime outdoor experiment to establish the link between NRBI_NIR and camera-to-object distance. The study produced the following findings. (1) The customized waterproof cases succeeded in preventing large shadows from being cast, especially on nighttime images, and it was confirmed that the brightness of the nighttime NIR images had spatial heterogeneity when a point light source (flashlight) was used, in contrast to the daytime RGB images. (2) The additional experiment using a forklift showed that both the ISO sensitivity and the calibrated digital number of the NIR (cDN_NIR) had significant effects on the sensitivity of NRBI_NIR to the camera-to-object distance. (3) Detailed measurements of a reproductive stem were collected to investigate the connection between the morphological feature change caused by the panicle sagging process and the downtrend in NRBI_NIR during the reproductive stages. However, these agronomic data were not completely in accord with NRBI_NIR in terms of the temporal pattern. (4) The time-series data for the LAI, plant length, and aboveground dry matter weight could be well approximated by a sigmoid curve based on NRBI_NIR and VARI. The results confirmed that NRBI_NIR was more sensitive to all of the agronomic data for overall season, including the early reproductive stages. VARI had an especially high correlation with LAI, unless yellow panicles appeared in the field of view.