Construction of Forestry Map Symbol Library and Symbolization Execution Based on MapGIS K9

In order to improve the cartography efficiency and the intelligent level of forestry map,we put forward the symbolization scheme of forestry map based on MapGIS K9 platform.Firstly,the symbol library of forestry map was constructed according to The Graphic Representation of Forestry Map which was issued by the National Forestry Bureau in October,2010.Then,the symbol configuration rule database was established to realize the expression of symbol configuration rule in the digital environment.Finally,the symbolization module was realized with the support of MapGIS Objects component development technology,and the thematic data of forestry were visualized according to the symbol configuration rule.The practice proved that the scheme could basically satisfy the cartography requirements of common forestry maps which included the forest management inventory map.

An Anti-aliasing Algorithm Suitable to Map Publishing Symbol

On the basis of analysis of various algorithms, an anti-aliasing algorithm called brush method was presented, which is suitable to map publishing symbol. After introducing the basic principle and implementation of brush method in detail, the result and efficiency were evaluated through experiments.

Studies of phase return map and symbolic dynamics in a periodically driven Hodgkin–Huxley neuron

How neuronal spike trains encode external information is a hot topic in neurodynamics studies. In this paper, we investigate the dynamical states of the Hodgkin-Huxley neuron under periodic forcing. Depending on the parameters of the stimulus, the neuron exhibits periodic, quasiperiodic and chaotic spike trains. In order to analyze these spike trains quantitatively, we use the phase return map to describe the dynamical behavior on a one-dimensional （1D） map. According to the monotonicity or discontinuous point of the 1D map, the spike trains are transformed into symbolic sequences by implementing a coarse-grained algorithm -- symbolic dynamics. Based on the ordering rules of symbolic dynamics, the parameters of the external stimulus can be measured in high resolution with finite length symbolic sequences. A reasonable explanation for why the nervous system can discriminate or cognize the small change of the external signals in a short time is also presented.

Algorithm of symbol generation and configuration of land polygons in present land-use map

The symbolization of land polygon is an important part of cartography. In the mapping of traditional present land-use maps, the symbol of land polygons was usually filled by the method of filling or plotting, but these methods can't solve the spatial conflicts of the symbol. According to the principle of cartography, the rule of how to symbolize the land polygon was summarized, and a new method that can generate and deploy the land symbols was presented. By making use of C# programming language and Arc Engine developing components, the algorithm can generate land symbols presenting triangle and adjust the coordinate of the symbol. Through mapping the present land-use map of Honghe county, this algorithm can reduce 88.84% of the spatial conflicts error rate compared with the traditional methods. It improves the accuracy and efficiency of the map symbolic.

Symbolic dynamics of Belykh-type maps

The symbolic dynamics of a Belykh-type map （a two-dimensional discon- tinuous piecewise linear map） is investigated. The admissibility condition for symbol sequences named the pruning front conjecture is proved under a hyperbolicity condition. Using this result, a symbolic dynamics model of the map is constructed according to its pruning front and primary pruned region. Moreover, the boundary of the parameter region in which the map is chaotic of a horseshoe type is given.

Enhanced cooperative packet retransmission employing joint cooperative diversity and symbol mapping diversity

A joint cooperation diversity and symbol mapping diversity (SMD) strategy is proposed for cooperative packet retransmission system with high-order modulation such as 16QAM. Substantial SER/BER (symbol error rate/bit error rate) gains result from multiple packet transmissions over independent paths and distinct bit-to-symbol mappings for each packet transmis-sion. The SER/BER performance of relay assisted retransmission system is analyzed. Simulation results show that the joint-diversity strategy can provide more BER gains than other relaying strategies (i.e., decode-and-forward and constellation rearrangement relaying strategies) when no relay makes a decision error; but if some relays make decision errors, the joint-di-versity strategy outperforms other relaying strategies only when the relays are closer to the source than to the destination.

A method of estimating initial conditions of coupled map lattices based on time-varying symbolic dynamics

A novel computationally efficient algorithm in terms of the time-varying symbolic dynamic method is proposed to estimate the unknown initial conditions of coupled map lattices （CMLs）. The presented method combines symbolic dynamics with time-varying control parameters to develop a time-varying scheme for estimating the initial condition of multi-dimensional spatiotemporal chaotic signals. The performances of the presented time-varying estimator in both noiseless and noisy environments are analysed and compared with the common time-invariant estimator. Simulations are carried out and the obtained results show that the proposed method provides an efficient estimation of the initial condition of each lattice in the coupled system. The algorithm cannot yield an asymptotically unbiased estimation due to the effect of the coupling term, but the estimation with the time-varying algorithm is closer to the Cramer-Rao lower bound （CRLB） than that with the time-invariant estimation method, especially at high signal-to-noise ratios （SNRs）.

A method of recovering the initial vectors of globally coupled map lattices based on symbolic dynamics

Based on symbolic dynamics, a novel computationally efficient algorithm is proposed to estimate the unknown initial vectors of globally coupled map lattices （CMLs）. It is proved that not all inverse chaotic mapping functions are satisfied for contraction mapping. It is found that the values in phase space do not always converge on their initial values with respect to sufficient backward iteration of the symbolic vectors in terms of global convergence or divergence （CD）. Both CD property and the coupling strength are directly related to the mapping function of the existing CML. Furthermore, the CD properties of Logistic, Bernoulli, and Tent chaotic mapping functions are investigated and compared. Various simulation results and the performances of the initial vector estimation with different signal-to- noise ratios （SNRs） are also provided to confirm the proposed algorithm. Finally, based on the spatiotemporal chaotic characteristics of the CML, the conditions of estimating the initial vectors usiug symbolic dynamics are discussed. The presented method provides both theoretical and experimental results for better understanding and characterizing the behaviours of spatiotemporal chaotic systems.

On new chaotic mappings in symbol space

A well known chaotic mapping in symbol space is a shift mapping.However,other chaotic mappings in symbol space exist too.The basic change is to consider the process not only at a set of times which are equally spaced,say at unit time apart（a shift mapping）,but at a set of times which are not equally spaced,say if the unit time can not be fixed.The increasing mapping as a generalization of the shift mapping and the k-switch mapping are introduced.The increasing and k-switch mappings are chaotic.

采用FME和ArcMap实现地形图制作服务

为了实现数字地形图DLG快速制作地图服务,解决数据格式转换和数字地形图DLG符号自动匹配的问题,采用FME空间数据转换系统实现CASS DWG至GIS GDB数据格式的无缝转换,且保留所需的属性信息,如图层名、要素编码、角度等;采用ArcMap相关功能模块,将要素编码与ArcMap符号库关联起来,实现要素与符号的自动匹配,从而实现数字地形图DLG快速制作地图服务及其衍生的各类专题图制作服务。

基于MAPGIS的全国地质工作程度数据库应用系统设计与实现

二十世纪在全国开展了大量地质调查工作,并且建立起“全国地质工作程度空间数据库”,急需研发应用系统保障该数据库作用的充分发挥。这里运用GIS软件工程原理,对应用系统进行了需求分析和系统分析,特别是对各重要模块进行了详细设计。该应用系统已基于MAPGIS 6.x实现,几项特色功能被重点展示,它们为保障整个系统功能起到了关键性的作用。

基于Autodesk Map地图符号库的设计与开发

在地图数字化过程中,经常需要使用一些专门的点、线、面符号来表示特定的地物,而在AutodeskMap的标准符号库中没有这类地图符号.为避免重复繁琐地绘制这些符号实体,在AutodeskMap环境下,依据地图符号的一般特点和编码原则,根据点、线和面符号复杂程度和结构形状的不同,采用定制法、PDB开发方法和ObjectARX二次开发方法,设计并创建了特定地物的地图符号库.

基于MapInfo的土地利用现状图符号库的设计与实现

MapInfo系统自带的符号库不能满足我国各种比例尺土地利用现状图的需要,通过分析MapInfo符号的建库原理和方法,同时结合土地利用现状图符号的特点,采用实验的方法解决符号制作的尺寸规律问题,设计、开发了满足国标要求的土地利用现状图符号库,并用实例对符号库的应用做了分析与探讨。

基于MapObjects的特殊点符号制作和旋转

结合研究项目"河南省内河航道基础地理信息系统",利用Visual Basic和MapObjects开发了航道系统专门的符号库,使用FontCreator字体软件制作所需符号,然后根据点符号旋转算法,利用渲染方法实现了有向点符号不同角度的旋转。

MapInfo下地图符号库的制作

分析了MapInfo符号制作技术原理,结合地形图点、线、面符号的特点,给出了一组符号制作的具体实例。

基于ArcMap的地图符号设计与研究

地图符号是地图的语言,地图符号的绘制是地理信息系统开发中的一个重要组成部分。主要讨论了ArcMap中地图符号的绘制方法,对几种ArcMap中不能实现的符号简要阐述了绘制方案。

SUMS OF DUAL TOEPLITZ PRODUCTS ON THE ORTHOGONAL COMPLEMENTS OF FOCK-SOBOLEV SPACES

We consider dual Toeplitz operators on the orthogonal complements of the FockSobolev spaces of all nonnegative real orders.First,for symbols in a certain class containing all bounded functions,we study the problem of when an operator which is finite sums of the dual Toeplitz products is compact or zero.Next,for bounded symbols,we construct a symbol map and exhibit a short exact sequence associated with the C^(*)-algebra generated by all dual Toeplitz operators with bounded symbols.

文化基因图谱建构的南丰傩面具图式再设计研究

目的以文化基因理论为基础,解读南丰傩面具所蕴含的文化基因中符合文化识别的因子,根据受众对因子的感知重要度,提出以符号为单位识别的文化基因表达方式。方法为量化评价傩面具的文化,通过提取南丰傩面具文化基因,运用AHP将定性和定量研究法相结合,构建文化基因谱系图——评价模型树。结果根据南丰傩面具文化基因图谱得出符号权重,通过拟态环境理论进行客观环境、信息选择、媒介加工、拟态环境四个层次分析具备品牌识别的符号,得出实质性的文化基因表达方式。结论从文化基因角度出发,以定性与定量研究相结合,有利于促进信息环境的形成,为南丰傩文化的传播增强文化认同感。

国家公园导览地图表达要素及其启示——以美国、加拿大为例

【目的】当今国内外国家公园管理与建设日益成熟,有关地图理论研究也较为丰富,但有关国家公园导览地图绘制研究仍较少,旨在从表达要素层面完善国家公园导览地图的绘制理论体系。【方法】研究数据来源于美国国家公园管理局和加拿大公园管理局共73个国家公园导览地图,通过总结地图符号学理论,将表达要素分为文字要素、图像要素、地图图形要素3大类与8小类,并运用频率统计与二元Logistic回归法进行数据分析。【结果】研究结果显示,美国国家公园导览地图中“文字注记”“具象符号”“线状符号”和“面状符号”出现的频率为100%,加拿大国家公园导览地图中“文字注记”和“面状符号”频率同样为100%,“线状图形”和“具象图像”也显示出相对较高的频率。同时,“文字注记”与“具象图像”对于国家公园导览地图具有显著相关性。【结论】通过对美国与加拿大国家公园导览地图分析,提出了表达要素的分类方法,为我国国家公园导览地图绘制提供了理论依据与应用方法,有助于提高国家公园导览地图的信息传达效率和准确性,对于国家公园的管理、保护和游憩活动规划提供了重要参考。

城市三维地图综合表达研究——以深圳市为例

三维地图综合表达是当前时空信息可视化的重要工作之一。现有相关研究缺乏适用于各类型应用场景的通用设计方法;且相较于二维,三维地图表达结构更为复杂,需要表达的空间信息与属性信息更加丰富,导致信息载负量增大,从而在一定程度上制约了三维地图的应用广度与深度。本文首先分析城市三维场景中的信息载负,对城市场景进行解构,引出三维地图的概念并分析其场景—类型—内容的关系,归纳场景中的城市地理要素;其次,从视觉变量、地图符号和设计框架三方面对三维地图常用表达方法进行分析,基于三维视觉变量理论设计三维符号,构建从视觉变量输入到三维符号输出全过程的综合表达方法;最后,以深圳市为例进行比较分析。结果表明:与已有成果相比,在数据体量大大增加的情况下,三维地图量减少了87%,渲染速度提高了约90%。本文方法在同等信息负载的情况下有效减少了符号的复杂程度,优化了三维符号的抽象程度,提高了三维地图的表达效果,这说明具有可行性。