查询词典 dem

The new method is composed of two algorithms for processing the depressions and plain areas in DEM.

针对传统的DEM洼地和平坦区处理方法存在的速度慢等问题，提出了新的DEM处理方法。

The high vision fraudulence is obtained for disguised DEM data.

针对DEM数据提出了直方图的概念，通过修改直方图，在伪装的DEM数据中可逆地嵌入水印。

The elevations add a Z value to the grounds X and Y horizontal coordinates. However, it is always more difficult to get DEM and normally needs more computing time to generate DEM since its complicated algorithm and huge data.

研究中 ，分别从数据并行和算法并行的角度，对 DEM生成算法并行化进行了分析，并在网络分布式机群下进行了数据处理实验，取得了较好的并行处理效果。

The reference crop evapotranspiration(ET0) in Guanzhong region was calculated with the Penman-Monteith equation. The change characteristics of meteorological factors and ET0 over year were analyzed. The regressing relation between ET0 and geography factors was established. Space distribution of ET0 based digital elevation model was obtained. The water consumption model of main cropes was established using the crop cofficient method. The irrigation water requirement of main crop and it's space distribution based DEM under the different precipitation probability was obtained, which advanced the calculation precision of ET0 from spot scal to regional scal. The concept of water consumption under the irrigational scal was proposed. The water consumption model of different water user and model of groundwater balance based on the water consumption of Baojixia irrigation district was established. Which can refects the relation between water utilization, water consumption and change amount of groundwater resouces.

深入分析了关中地区气象要素的变化趋势，用Penman-Montainth 公式计算了参考作物蒸发蒸腾量（ET0），建立了ET0与地理要素的多元回归关系，获得了基于数字高程模型DEM的关中地区ET0的空间分布图；用作物系数法建立了关中主要作物生育期耗水模型，获得了主要作物在不同降雨条件下的灌溉需水，以及基于DEM的主要作物灌溉需水空间分布图，提高了作物蒸发蒸腾量由点到面尺度转换过程中的估算精度；界定了灌区尺度的耗水量的概念，包括用水耗水和非用水耗水，建立了灌区耗水量计算模型及基于耗水量变化的浅层地下水均衡模型，能较好地反映灌区引水量、耗水量及地下水蓄变量之间的内在关系。

The authors begin with reducing personal error, conclude personal errors during digitize and point out corresponding correct methods. At the same time, a new method is advanced to check out DEM errors quickly. To some degree, the article can conduct the production.

从如何减少DEM构建过程中的人为误差入手，对数字化过程中容易出现的人为误差进行了总结，指出相应的改进方法，并提出一种简便易行的快速检查DEM中错误的办法，对于指导生产实践有一定意义。

An information disguising and hiding technique is used to protect DEM data for store and transformation in this paper.

提出了一种结合信息伪装和隐藏技术来保护数字高程模型(digital elevation model，简称DEM)数据的方法，保证了DEM数据的安全传输和存储。

In this paper an efficient approach via wavelet for digital watermark in DEM data is developed, which effectly protects the copyright of DEM data and avoids the unauthoritative user.

提出了一种高效、安全的数字高程模型(digital elevation mode，简称DEM)数据小波水印算法，以解决DEM数据版权保护和限制非法使用的问题。

Based on summarizing the definition, characters, application and development trend of GIS and DEM, the thought and method of calculating channel volumes and channel evolution analyses with GIS and DEM technique are brought forward. Withthis technique, silt-deposit amounts of several regions for over one hundred years are calculated, which separately are South Branch, South and North Channel, mouth bar area, offshore and Hangzhou Bay, etc.

在总结GIS和DEM的定义、特点、应用及发展趋势的基础上，提出应用GIS和DEM技术计算河槽冲淤量和进行河床演变分析的思路和方法，基于这一手段，首次将整个长江口和杭州湾作为研究对象，对其各组成区域在同一时间背景下的冲淤量进行了全面系统的分析，力求提供有关长江口及杭州湾百余年来平均冲淤状况全貌的认识。

Moreover, the conclusion was farther validated by ERS-1/DEM gridded 5 kilometers and RADARSAT Antarctic Mapping Project 1km-gridded DEM, tidal noise detected by in situ GPS measurements, and horizontal velocity vector map from RADARSAT SAR images deduced by interferometry method of the whole ice stream.

同时对该地区所在的整个冰流系统用5km分辨率的ERS-1/DEM数据和1km分辨率的RAMP/DEM数据、GPS实地测量数据，以及RADARSAT InSAR速度矢量图等对这一结论进行了深入的验证。

Three-pass differential interferometry, ultrashort baseline and external DEM based repeat-pass SAR interferometry are employed to assess the seismic displacement.The final results show that the external DEM based repeat-pass InSAR is better than three-pass differential method in such area.

本研究分别进行了三路差分干涉、超短基线重轨干涉和基于外部DEM的重轨干涉处理方法的实验，对于结果的对比分析表明，基于外部DEM的重轨干涉方法在该类地区应用效果优于三路差分方法。

On the other hand, the more important thing is because the urban housing is a kind of heterogeneity products.

另一方面，更重要的是由于城市住房是一种异质性产品。

Climate histogram is the fall that collects place measure calm value, cent serves as cross axle for a few equal interval, the area that the frequency that the value appears according to place is accumulated and becomes will be determined inside each interval, discharge the graph that rise with post, also be called histogram.

气候直方图是将所收集的降水量测定值，分为几个相等的区间作为横轴，并将各区间内所测定值依所出现的次数累积而成的面积，用柱子排起来的图形，也叫做柱状图。