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chingchai/QGIS-calculate-field-rai-ngan-and-square.md

Last active October 15, 2016 02:47
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การคำนวณเนื้อที่ไร่ งาน และตารางวา ในโปรแกรม QGIS
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QGIS-calculate-field-rai-ngan-and-square.md

Author: Chingchai Humhong (chingchai.h@gmail.com)

Date: 2016/10/15

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
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