ANALISIS PENGARUH JUMLAH GCP (GROUND CONTROL POINT) TERHADAP AKURASI PETA ORTHOFOTO PADA JALAN YANG BERKARAKTER CURAM DENGAN TIKUNGAN TAJAM HASIL PEMOTRETAN UDARA METODE UAV-FOTOGRAMETRI
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Abstract
Studi tentang pengaruh konfigurasi Ground Control Point (GCP) terhadap akurasi peta orthofoto hasil pemotretan metode UAV-Fotogrametri telah banyak dilakukan. Akan tetapi penelitian-penelitian tersebut dilaksanakan dengan kondisi objek berupa area atau jalan yang relatif datar. Penelitian ini bertujuan untuk mengetahui pengaruh dari pola dan jumlah GCP terhadap akurasi peta orthofoto yang dihasilkan dengan kondisi objek jalan yang berkarakter curam dengan tikungan tajam. Digunakan 4 skenario pola dan jumlah GCP pada area jalan sepanjang ± 500 meter, 4 skenario divalidasi menggunakan RMSEr untuk ketelitian posisi horizontalnya dan RMSEz untuk ketelitian posisi vertikalnya. Dari skenario percobaan yang dilakukan didapatkan hasil yaitu pada skenario pertama dengan GCP 3 buah menghasilkan nilai RMSEr = 0,193 m dan RMSEz = 0,262 m, kedua dengan GCP 4 buah menghasilkan nilai RMSEr = 0,200 m dan RMSEz = 0,608 m, ketiga dengan GCP 4 buah yang diletakan pada setiap tikungan menghasilkan nilai RMSEr = 0,164 m dan RMSEz = 0,429 m, keempat dengan GCP 5 buah menghasilkan nilai RMSEr = 0,134 m dan RMSEz = 0,401 m. Ketelitian geometri dari empat skenario peta orthofoto yang dihasikan mampu mencapai skala peta 1:2500 dengan interval kontur 1,25 m berdasarkan pedoman teknis ketelitian peta dasar.
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