Analisis Perubahan Vegetasi dan Lahan Terbangun Kota Manado Tahun 2017–2025 Menggunakan Citra Landsat
DOI:
https://doi.org/10.59563/djtech.v7i1.434Keywords:
Lahan Terbangun, Kota Manado, Landsat, Perubahan Tutupan Lahan, VegetasiAbstract
Dinamika kawasan perkotaan dapat ditinjau melalui perubahan komposisi tutupan lahan, terutama pada keberadaan vegetasi dan perkembangan lahan terbangun. Penelitian ini mengkaji perubahan kedua kelas tersebut di Kota Manado antara tahun 2017 dan 2025 dengan memanfaatkan data penginderaan jauh Landsat. Citra Landsat 8 OLI tahun 2017 dan Landsat 9 OLI-2 tahun 2025 diolah melalui tahapan prapemrosesan dan ekstraksi informasi spektral. Identifikasi karakteristik tutupan lahan dilakukan dengan mengintegrasikan band spektral dan empat indeks, yaitu NDVI, NDBI, MNDWI, dan BSI, ke dalam model klasifikasi Random Forest. Evaluasi model dilakukan menggunakan data pengujian dengan proporsi pembagian sampel 70:30. Hasil menunjukkan bahwa klasifikasi menghasilkan Overall Accuracy sebesar 94,25% pada 2017 dan 98,85% pada 2025. Perbandingan hasil klasifikasi memperlihatkan luas vegetasi bertambah dari 9.646,65 ha menjadi 9.764,10 ha, atau mengalami peningkatan 117,45 ha. Pada periode yang sama, luas lahan terbangun berubah dari 4.438,53 ha menjadi 4.126,14 ha, atau mengalami penurunan 312,39 ha. Temuan ini memperlihatkan adanya perubahan komposisi tutupan lahan Kota Manado selama periode pengamatan. Hasil penelitian dapat menjadi informasi spasial dalam pemantauan perubahan vegetasi dan kawasan terbangun serta mendukung penyediaan data untuk evaluasi perkembangan wilayah perkotaan.
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