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Land cover change
1.
Land cover change เปิดข้อมูลภาพโดยไปที่
Add Raster Layer เลือก Folder RS2 เลือกภาพ2ภาพใน Folder LCC ได้รูปตามนี้
2.
ดับเบิ้ลคลิกที่รูป2006เพื่อเปลี่ยนสีตาม band 2
3 1 ผลลัพธ์ภาพผสมตาม band 23 1
3.
ดับเบิ้ลคลิกที่รูป2014เพื่อเปลี่ยนสีตาม band 21
3 ผลลัพธ์ภาพผสมตาม band 21 3
4.
เริ่มทาการ training area
โดยคลิกที่ Refresh list เลือกภาพ RGB 2006
5.
สร้าง shpfile
New shp. ตั้งชื่อ ROI2006
6.
จำแนกเป็น 4ประเภท 1.water
2.Veg 3.Build-up 4.Salt field คลิกที่ปุ่ม Create a ROI เริ่มtrainingareaพื้นที่ทั้งหมดแบ่งตาม1.water 2.Veg 3.Build-up 4.Salt field
7.
เมื่อแปลภาพถ่ายครบหมดแล้วเริ่มประมวลผลโดยไปที่ classification algorithmเลือก
Maximum Likehood แปลภาพออกมาโดยไปที่ Preform classification เลือกที่save ตั้งชื่อ Class_2006
8.
ผลที่ได้จากการแปลภาพปี 2006 ลบClassด้านข้างออกเพื่อที่จะเริ่มแปลภาพถ่ายอีก1ช่วงปี โดยคลิกที่Delete
Yes
9.
Class ด้านข้างก็จะหายไป ภาพปี 2014
10.
เริ่ม training area
พื้นที่ทั้งหมดแบ่งตาม 1.water 2.Veg 3.Build-up 4.Salt field โดยทาเหมือนเดิมเหมือนตอนทาปี 2006 ผลที่ได้จากการแปลภาพปี 2014
11.
ไปที่เครื่องมือ Semi-Automatic ClassificationPost
processingAccuracyคลิก Refresh list (Class_2014)คลิก Refresh list(ROI2014)Calculate error matrix หน้าต่างแสดงค่าความถูกต้องของการแปลภาพจะแสดงขึ้นมา
12.
Post processingLand cover
changeคลิก Refresh list (Class_2006)คลิก Refresh list(Class_2014)Calculate land cover change ผลที่ได้คือค่าที่แสดงค่าการเปลี่ยนแปลงระหว่าง 2 ปี ดับเบิ้ลคลิก LCC_2006_2014 ช่อง Mode= Equal interval Classes Classify เพื่อเปลี่ยนสีตามต้องการ
13.
ผลลัพธ์
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