海面下の面積を計算する

Question

<\/HEAD>皆さん、おはようございます。<\/SPAN><\/P>DEMとコミューンのポリゴンを含むshapefileから、各コミューンの海面下の総面積を計算する最適な方法は何でしょうか？<\/SPAN><\/P>ご助力いただけると幸いです。よろしくお願いいたします。<\/SPAN><\/P><\/BODY><\/HTML>

BrunoDI_GIUSTO · Answer

1- raster calculator (in Spatial Analyst Tools/Map Algebra) with [original DEM] <= 0 which produce a new raster with two categories, one above sea level and another below sea level

2- Tabulate area (in Spatial Analyst Tools/Surface/Zonal/) which calculate the surface of each previous categories within the polygons of the shapefile.

3- in the table created, create a new field for the total surface of the two categories.

4- in the same table, create a new field for the percentage of submerged land with surface of submerged land / total surface. Click on properties on the percent field, then click percentage, then Numeric, then all frequencies are percentage, adjust the number of decimals.

5-Spatial join the table to the original table of the shapefiles of the communes. End