Sen2Cor adalah plug-in untuk ESA SNAP yang digunakan untuk melakukan koreksi atmosfir, terrain, dan awan cirrus pada citra Sentinel-2 Level 1C yang masih dalam reflektansi TOA yang dibuat dan dipublikasikan secara gratis oleh agensi antariksa Uni Eropa (European Space Agency). Perlu diperhatikan disini bahwa Sen2Cor saat ini hanya tersedia bagi Sistem Operasi ber-arsitektur 64 bit saja.
Untuk anda yang belum mengetahui mengenai processing level pada Citra Sentinel-2 yang didistribusikan oleh ESA, maka akan saya jelaskan sedikit:
- Level-1C, citra ini sudah dilakukan proses koreksi radiometrik dan geometrik dan masih dalam reflektansi atas atmosfer (Top of Atmosphere / TOA)
- Level-2A, citra ini sudah dilakukan proses koreksi atmosferik atau sudah dalam reflektansi bawah atmosfer (Bottom of Atmosphere / BOA)
Dalam tulisan kali ini saya akan menjelaskan langkah-langkah detail untuk proses instalasi Sen2Cor yang merupakan salah satu Plug-in pada SNAP yang digunakan untuk memproses citra Sentinel-2 Level-1C menjadi Level-2A, dengan tahapan sebagai berikut:
1. Menghapus seluruh plug-in Sen2Cor (jika ada)
Tahapan ini dilakukan jika sebelumnya pernah dilakukan instalasi Sen2Cor dengan versi yang sama atau lebih rendah dari versi 2.8. Jika ini adalah pertama kalinya instalasi dilakukan maka tahapan ini bisa dilewati dan langsung saja ke tahap nomor 3.
- Pada menu bar SNAP pilih Tools > Plugins
- Pada jendela Plugins pilih tab Installed dan kemudian pilih Sen2Cor dari list yang ada kemudian pilih Uninstall yang ada di bawah.
- Tunggu proses hingga selesai, kemudian restart SNAP
2. Menghapus seluruh folder Sen2Cor
Tahapan ini dilakukan untuk menghapus sisa-sisa file dari Sen2Cor versi sebelumnya dari sistem, agar instalasi barunya benar-benar clean.
- Buka Windows Explorer dan aktifkan Hidden Items.
- Buka path berikut ini: C:\users\[NAMA ANDA]\.snap\auxdata\
- Hapus folder \Sen2Cor-[versi Sen2Cor].
3. Melakukan instalasi Sen2Cor baru
- Pada menu bar SNAP pilih Tools > Plugins.
- Buka Tab Available Plugins kemudian pilih Sentinel-2 SEN2COR280 Processor dari list Plugins kemudian pilih Install.
- Instalasi membutuhkan waktu kurang dari 1 menit, jika sudah selesai keluarkan jendel Plugins tersebut.
4. Mengunduh Sen2Cor
- Buka situs berikut ini: http://step.esa.int/main/third-party-plugins-2/sen2cor/sen2cor_v2-8/
- Scoll down hingga pada bagian Latest release > Standalone installer, dan pilih Windows installer: Sen2Cor-02.08.xx-win64.zip (xx adalah versi dari Sen2Cor).
- Tunggu proses pengunduhan berlangsung hingga selesai, adapun ukuran file tersebut sekitar 200 Megabytes.
- Ekstraksi file hasil unduhan dari tahap sebelumnya ke path berikut: C:\users\[NAMA ANDA]\.snap\auxdata\, sehingga susunan direktorinya menjadi seperti ini:
5. Menjalankan Sen2Cor
Pada tahap ini dilakukan proses ujicoba apakah Sen2Cor sudah terintegrasi dengan baik dengan SNAP atau belum, adapun tahapannya adalah sebagai berikut:
- Buka citra Sentinel-2 Level-1C yang akan dilakukan koreksi, dengan cara pilih menu File > Open Product… dan pilih file MTD_MSIL1C.xml dari direktori Sentinel-2 dan kemudian pilih Open.
- Ketika citra sudah termuat di SNAP (muncul di Product Explorer sebelah kiri) kemudian pilih menu Optical > Thematic Land Processing > Sen2Cor Processor > Sen2Cor280.
- Jendela Sen2Cor akan muncul dan pada Tab I/O Parameters pilih citra yang telah termuat sebelumnya.
- Pada Tab Processing Parameter bisa dilakukan konfigurasi sesuai dengan output yang diinginkan, adapun petunjuk/referensi dari setiap parameter pada bagian ini bisa dilihat di sini.
- Jangan lupa checklist pada bagian Display execution output, kemudian pilih Run.
- Hasil outputnya akan termuat otomatis dalam lembar kerja SNAP dan juga akan ter-generate otomatis di direktor di mana kita menyimpan citra Sentinel-2 yang sebelumnya kita proses. Naming convention dari foldernya berubah dari S2N_MSIL1C_XXX menjadi S2N_MSIL2A_XXX (dengan N: kode satelit dan XXX: tanggal akuisisi dan beberapa kodefikasi lainnya).
- Jika muncul pesan “Before executing the tool, please correct the error below” pastikan path hasil ekstraksi pada tahap 4 sudah benar dan versinya sesuai.
Menggunakan Sen2Cor untuk koreksi citra Sentinel-2
Sen2Cor bekerja cukup baik dalam proses menghilangkan gangguan atmosfir dalam citra Sentinel-2, sehingga efek haze (kabut tipis) bisa diminimalisir dan juga menghasilkan spektrum yang lebih natural seperti yang ditunjukkan pada gambar berikut ini yang merupakan kenampakan dari Bandar Udara Internasional Yogyakarta (YIA) pada Bulan Juli 2020.
Sumber: https://sentinel.esa.int/web/sentinel/user-guides/sentinel-2-msi http://step.esa.int/main/third-party-plugins-2/sen2cor/ https://step.esa.int/thirdparties/sen2cor/2.4.0/Sen2Cor_240_Documenation_PDF/S2-PDGS-MPC-L2A-SUM-V2.4.0.pdf https://forum.step.esa.int/t/sen2cor-detailled-instructions/8659
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