การคำนวณเนื้อที่ไร่ งาน และตารางวา ในโปรแกรม QGIS

1. create field rai ngan and sqrwa in QGIS

* rai type integer length 5
* ngan type integer length 5
* sqrwa type double length 10,2

2. calculate field rai in QGIS

floor($area/1600)

3. calculate field ngan in QGIS

floor((($area/1600)-“rai”)*4)

4. calculate field sqrwa in QGIS

(((($area/1600)-“rai”)*4)-“ngan”)*100

rai

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