GIS Lab8 课程笔记 重分类，DEM，栅格计算器

jpg 是图像文件

jpgx是arcgis用的图像文件

kmz 谷歌map用的多，保存地标的文件

mxd 是一种包含操作空间的文件，是arcgis的文档文件，包含当前图层的名称，符号，颜色和几何属性特征

shapefile 属于一种矢量图形格式，他能够保存几何图形的位置和相关属性；

dbf是数据库文件

csv 逗号分隔符，字符分隔值

prj 投影文件，储存投影方式的文件

LULC 土地利用和土地覆盖

DEM 数字高程模型

GDD growing degree days 生长度日

IDW 反距离权重法

OK  普通克里金插值方法

Feature & its area calculation 要素的属性，tool里面

raster & its area calculation 栅格的面积计算，计算属性，个数乘以面积

datum 是基准信息（从哪个位置投射光），projection是投影方式

 

四维物体

选最适合种植的区域

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结合如下两个图层

来生成Agro-ecological Zones

Now, we will Reclassify the soil drainage data (TCsoil_sdc10) into two drainage classes. : “1” (to include only “somewhat poorly drained”) and “2” (to include three groups of “somewhat excessively drained,” “well drained,” and “moderately well drained”).  This will be done in the Reclassify table itself where you indicate what the “new values” are.  Save the Output raster as “TC_drain_2cls” in your Tompkins County geodatabase.

AEZ definitions:

AEZ 1: GDD = le 2200 (Value = 1), drainage = somewhat poor (Value = 1)

AEZ 2: GDD = gt 2200 (Value = 2), drainage = somewhat poor (Value = 1)

AEZ 3: GDD = le 2200 (Value = 1), drainage = well, moderately well, somewhat excessively (Value = 2)

AEZ 4: GDD = gt 2200 (Value = 2), drainage = well, moderately well, somewhat excessively (Value = 2)

 

 

之前生成0，1

现在生1，2，3，4

The “con” command works like an “if…then…otherwise” statement on each raster. Each “con” statement presents a choice between two options: if something is true, output a value; otherwise, follow other directions.

 

Con("AEZ1_gd1sd1" == 1,1,Con("AEZ2_gd2sd1" == 1,2,Con("AEZ3_gd1sd2" == 1,3,0)))

Con("AEZ1_gd1sd1" == 1,1,Con("AEZ2_gd2sd1" == 1,2,Con("AEZ3_gd1sd2" == 1,3,Con("AEZ4_gd2sd2" == 1,4,0))))

 

接下来处理DEM，利用dem来计算地形，坡度和坡向，山丘的阴影

 

Create new raster data sets from the Tompkins County digital elevation model (DEM)

Now that the two “global” properties of climate and soil have been combined into the AEZs, we can begin to work with the data that might constrain site selection on a very local basis.

 

Insert a new Data Frame into your map document and change its name to “Constraints” and add the digital elevation model (DEM) for Tompkins County that you created in an earlier lab (TC_elev_utm83)

 

aspect 表示坡向

Azimuth  太阳方位角

Altitude   太阳高度角