QGIS- Grid processing -DEM Data reclassification

Introduce

Reclassification is the reclassification of all pixel values of the original grid data through a set of functions , The process of obtaining a new set of classified data .

QGIS Two reclassification tools are provided ：

• Reclassify by table
• Reclassify by layer

Use here Reclassify by layer Tools , Jiangsu Province 30m Resolution DEM The data is ten times higher

The process

Tool use

Create classification EXCEL form

Mediate the original classification to the minimum （min） And maximum （max） Set the pixels between to the new pixel value （newvalue）

Use the classification table to reclassify

result

The batch

All over Jiangsu Province DEM The data are 20 picture , It's too troublesome to deal with each one alone ,QGIS Provides batch processing methods , The specific operation is as follows ：