Focus on the principles of raster data storage and applications.
重点讨论存储栅格数据的原理及应用。
Several data formats fit the raster model well.
有些数据格式可以很好地适用于栅格模型。
Vector data require far less storage than raster data because arc node lists simplify and reduce the data required to make sense of the features contained in the map.
矢量数据要求的存储要比栅格数据少得多，因为弧节点列表简化并减少了表示地图中包含的特征所需的数据。
Applications store GIS data using two distinct data structures: raster data and vector data.
应用程序使用两种不同的数据结构存储GIS数据：栅格数据和矢量数据。
See the link to the GDAL raster format information page in Resources for more information on other raster data formats.
见参考资料中gdal光栅格式信息页，了解更多关于其他光栅数据格式的信息。
Raster is one of the most intuitionistic and simplest spacial data structure.
栅格结构是最简单最直观的空间数据结构。
An index model of soil erosion estimation was put forward based on raster data after analyzing the main influence factors in Weifenhe watershed.
在分析土壤侵蚀形成的主要影响因子基础上，提出了基于栅格数据的流域土壤侵蚀量估算的指标模型。
There are two major choices of data model: raster and vector.
有两种主要的数据模型可选择：栅格和矢量。
Combines the color data for the source and destination bitmaps using the specified mask and raster operation.
使用指定的掩码和栅格操作混合源位图和目标位图的颜色数据。
Vector and raster are two basic formats of geospatial data used in GIS.
矢量和栅格是GIS应用中两种基本的地学数据格式。
Utilizing the extended library provided by ERDAS IMAGINE, and by using the self-defined spheroid IAG75 the projection transform of raster data is achieved successfully.
此方法利用ERDASIMAGINE的扩展库自定义新的投影椭球，用自定义的投影椭球对栅格数据成功地进行了投影变换。
Import and export vector and raster data, convert between different GIS data formats.
导入和导出矢量数据及栅格数据，实现多种GIS数据格式之间的转换。
Map projection transformation of vector data is becoming mature presently, but research and application of raster data projection transformation in GIS needs further efforts.
当前GIS中矢量数据的投影变换已日趋成熟，而栅格数据的投影变换的研究与应用还需要进一步的深入。
Based on summarizing the existing algorithms of transferring vector data to raster data, an optimization algorithm is proposed.
在总结现有的矢量数据向栅格数据转换算法的基础上，提出一种面积误差最小约束下的优化算法。
Digital raster graphic(DRG) and digital line graphic(DLG) are two digital maps that can be taken cheaply, and DLG is a commonest data format now, it is the main data source of GIS.
数字栅格图和数字线划图是可以低成本获取的两种数字地图，而DLG是目前最普遍的矢量数据格式，是GIS的主要数据来源。
As a basal part of the whole project, this study is demanded to provide necessary data for other systems. One of the tasks is to extract vector data from raster images.
作为项目的基础性部分，本课题需要为其它相关的课题提供所需的数据，其中很重要的一项任务就是从栅格影像中获取矢量数据。
Putting forward the change statistic method based on acreage, and counting the varieties of vector map data by using polygon intersection of vector data and changed pixel of raster data.
提出基于面积的变化统计方法，分别利用矢量数据的多边形交集和栅格数据的变化像素来统计地图矢量数据的变化。
It includes some basic points such as scanning precision, format description of scanned data, conversion from the scanned data to generalized raster data, geometric correction and photograph merging.
阐述了扫描精度、扫描数据格式说明、转换成通用的栅格数据方法、几何纠正、像片拼接等基本问题。
It is essential to the spatial raster data structure of GIS; in fact, all spatial analysis about raster data is based on the digital topology.
数字拓扑主要研究栅格空间中离散几何对象的拓扑性质，这些性质在GIS空间分析和栅格数据处理中非常重要。
The algorithm of transferring vector polygon to raster data is one of the basic algorithms of GIS.
矢量多边形的栅格化算法是地理信息系统的基础算法之一。
The subdivision and identifying direction problem of raster data display instrument is proposed by studying the principle of raster measuring.
通过研究光栅检测的工作原理，提出了光栅数显表的细分和辨向问题。
The developing procedure of this system gives a good example for application of HDF data format processing and management of huge amounts of raster image data and attribute data.
该系统的开发过程对于利用HDF数据格式处理和管理海量图像数据和属性数据具有一定的借鉴作用。
In the raster data model, the map's accuracy also depends on the map's scale.
在栅格数据模型中，地图的准确性还依赖于地图的比例。
Specifies raster font enumeration data.
指定点阵字体枚举数据。
The key problems when designing a raster ruler data acquisition card were pulses frequency multiplication and counting.
设计光栅计数卡的关键问题是对光栅脉冲进行倍频以及对倍频后的脉冲进行计数。
Its capabilities include: data input, geographical analysis (raster, vector and site), manipulate multi-spectral images and map display.
其功能包括：数据输入、地理分析(栅格、矢量、点)、多光谱图像处理、地图显示。
Then, a new table structure to store the raster data is put forward, so that the methods for the erosion-deposition prediction are discussed initially to improve the work efficiency.
然后提出一种新的存储栅格数据的表结构，对河道的冲淤预测方法进行了初步地探讨，为快速有效地分析河道冲淤规律奠定了基础。
Raster data is non-geometric data defined by a grid of values covering a spatial area.
光栅数据是由覆盖空间区域的网格值所定义的非几何数据。
The library gives programmers a common data model covering all raster data formats and -- through OGR -- vector data formats.
该库为编程人员提供了通用的数据模型，包括所有栅格数据格式和矢量数据格式（通过OGR）。
By having your map consume MapServer-driven Web map service (WMS) services, you can also include your own datasets, such as shapefiles and raster data.
通过让地图使用MapServer驱动的WebMapService (WMS)服务，还可以将您自己的数据集包括进来，比如shapefile和raster数据。
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