景观分析工具：arcgis中patch analysis模块(2)

pixel. If a pixel with the same value is found on any of the four sides of pixel, the two pixels will be clumped together. In the example below there are two distinct patches when the 4N - Use Orthogonals method is used (Patch A and Patch B). In contrast, if 8N - Use Diagonals is selected the searches will include the four sides of each pixel and the diagonals of each pixel, or each surrounding pixel, hence eight neighbours. In the example, only one discrete patch would be defined using the 8N - Use Diagonals method, and it would include all the white pixels

解散栅格的步骤：

To dissolve a raster (grid):

Select the desired raster (grid) to dissolve from the ArcMap table of contents.

1. Choose Create Patch Theme from Grid from the Patch Grid menu . 2. Choose the field to clump by and then click OK.

1. Select the Clumping Method (4N - Use orthogonals or 8N - Use Diagonals) and then clickOK and the tool will execute. For more information on Clumping Method refer to Create Patch Theme from Grid.

叠加（合并）栅格

Intersect (Combine) Grids

相交（合并）栅格允许用户对栅格图层进行叠加，尤其适用于叠加六边形图层（在斑块图层被转换为栅格格式后）。

Intersect (Combine) Grids allows users to intersect raster (grid) layers (themes), and is especially useful to intersect the hexagon layer (theme) (once its been converted to raster (grid) format) with a specified patch layer (theme).

叠加（合并）栅格教程

Intersect (Combine) Grids Tutorial

1. Intersecting grids is often the first step for Analysis by

Regions. To combine to raster (grid) layers (themes) into one layer (theme) select Intersect (Combine) Grids from the Patch Grid Menu.

2. Choose the first raster (grid) from the pull down menu of

available layers (themes) and click OK.

3. Choose the second raster (grid) from the pull down menu of

remaining available layers (themes) and click OK.

4. The user will then be prompted for a name and location of the

new layer (theme) that will be created. Once that is done and the user clicks Save the rasters (grids) will be combined.

将栅格剪辑为多边形主题 Clip Grids to Polygon Theme

此功能将栅格（网格）剪辑为一个多边形图层（主题）。它不同于其他arcgis中你可以找到的类似程序，将新栅格的大小 以剪辑的多边形图层大小来定义。其结果是栅格文件占用的空间被大幅度减小，尤其是是由Fragstats导出的栅格文件。使用此功能可能会解决遇到 Fragstats引擎输入栅格数据文件的大小限制发生的诸如\输出文件未找到\或其他Fragstats错误。

This function will clip a raster (grid) to a polygon layer (theme). It differs from other similar procedures you might find in ArcGIS in that the extents of the new grid is defined by the extents of the clip polygon theme. This results in a considerable reduction

in the size of the grid, and especially the exported grid file that is used by Fragstats. Using this function may resolve many of of the \encountered, as the Fragstats engine is limited by the size of the input raster data file.

剪辑栅格为多边形教程

Clip Grids to Polygon Theme Tutorial

5. To clip a raster (grid) to a polygon layer (theme) select Clip

Grids to Polygon Themefrom the Patch Grid Menu. A dialog box with a pull-down menu containing all available raster (grid) layers (themes) (i.e. on the current map) will open.

6. Choose the raster (grid) layer (theme) that is to be clipped

and click OK. The next dialog box to appear will contain a list of all possible polygon layers (themes) that can be used to clip the raster (grid). Choose one and click OK.

7. The user will then be prompted for a name and a location (drive

path) for the new layer (theme) to be saved. Once the file name is entered and the user clicks Save, the tool will execute and clip the raster (grid) to the polygon layer (theme)。 空间分析（fragstats界面）

Spatial Statistics (FragStats Interface)

从patch grid 菜单选择Spatial Statistics (FragStats Interface)菜单项打开界面。

Selecting Spatial Statistics (FragStats Interface) from

the Patch Grid menu brings up the \Statistics\dialog box.

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