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。
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。
By analyzing the raster data to do the calculation of the spread of the signal.
通过分析栅格数据对信号的传播进行计算。
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。
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。
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。
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。
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。
When accessed to the whole raster data, the records remain in the stack are the re- quired bintree encoding results.
当对整个栅格数据遍历一次后，栈中剩下的记录便是所需的线性二又树编码结果。
Layers of raster data are more often called bands, although the term layer still applies to raster as well as vector data.
光栅数据的层通常称为段，而术语层仍然用于光栅和矢量数据。
Elevation data is a good example of a single-band raster dataset, often visualized with a color ramp, as shown in Figure 2.
高程数据就是很好的单级光栅数据的例子，它经常用颜色坡度，如图2所示。
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）。
GDAL also enables programmers to project raster data onto worldwide geographical coordinates, known as georeferenced coordinates.
GDAL还可让编程人员在世界地理坐标（即地理参考坐标）上设计栅格数据。
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。
However, storage might not be quite as important for raster data, whose spatial component likely contains fairly simple numerical data.
然而，存储可能不像栅格数据那样重要，其空间构成可能包含相当简单的数字数据。
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 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。
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。
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。
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。
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。
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。
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。
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。
QGIS handles all three — raster, vector, and database — a state of affairs that took considerable effort for programmers writing GIS data programming libraries.
QGIS处理所有三种数据——栅格数据、矢量数据和数据库，这也是编写GIS数据编程库的程序员的重要努力方向。
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。
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。
QGIS handles all three - raster, vector, and database - a state of affairs that took considerable effort for programmers writing GIS data programming libraries.
QGIS处理所有三种数据栅格数据、矢量数据和数据库，这也是编写GIS数据编程库的程序员的重要努力方向。
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