GIS Lab8 課程筆記重分類，DEM，柵格計算器

原創

BR_Chen

2020-04-16 15:23

jpg 是圖像文件

jpgx是arcgis用的圖像文件

kmz 谷歌map用的多，保存地標的文件

mxd 是一種包含操作空間的文件，是arcgis的文檔文件，包含當前圖層的名稱，符號，顏色和幾何屬性特徵

shapefile 屬於一種矢量圖形格式，他能夠保存幾何圖形的位置和相關屬性；

dbf是數據庫文件

csv 逗號分隔符，字符分隔值

prj 投影文件，儲存投影方式的文件

LULC 土地利用和土地覆蓋

DEM 數字高程模型

GDD growing degree days 生長度日

IDW 反距離權重法

OK 普通克里金插值方法

Feature & its area calculation 要素的屬性，tool裏面

raster & its area calculation 柵格的面積計算，計算屬性，個數乘以面積

datum 是基準信息（從哪個位置投射光），projection是投影方式

四維物體

選最適合種植的區域

結合如下兩個圖層

來生成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

現在生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))))

接下來處理DEM，利用dem來計算地形，坡度和坡向，山丘的陰影

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)