Pergi ke code editor https://code.earthengine.google.com/
Dengan menggunakan code editor Anda akan melakukan berbagai langkah selanjutnya.
Langkah pertama adalah dengan berlatih dengan script di bawah ini :
// cari citra yang akan anda tampilkan dari catalog, dalam kasus ini kita menggunakan SRTM 90 m
var elevtumpang7 = ee.Image('CGIAR/SRTM90_V4');
// diperbesar ke lokasi yang kita inginkan
Map.setCenter(114.0312857, -8.618189, 10); // pusatkan kepada gunung tumpangpitu di banyuwangi
// menampilkan dalam peta
Map.addLayer(image);
Klik tombol Run di bagian atas code editor. Apa yang Anda temukan? Apakah peta Anda hanya berwarna abu saja? Hal ini disebabkan karena Anda menggunakan batas bawah simbolisasi terlalu rendah dan batas atas simbolisasi yang terlalu tinggi sehingga elevasi hanya ditampilkan dalam abu untuk mayoritas ketinggian.
Anda dapat mengubah simbolisasi ini melalui icon gear yang akan muncul setelah Anda meletakkan cursor di atas window layer berikut.
Sehngga akan muncul window di kirinya seperti berikut :
Anda dapat membatasi langsung pada window ini dengan membuat range ketinggian minimum sampai maksimum untuk simbologi dengan mengisikan pada range, atau dapat juga melalui tombol custom. Dalam tombol dropdown custom Anda akan menemukan beberapa pilihan simbologi untuk range data Anda mulai dari 1 tao hingga 100% stretch. 100% stretch berarti Anda memilih elevasi minimal dan maksimal sebagai batas. Klik Apply.
Anda akan mendapatkan hasil tampilan DEM yang familier dengan yang seperti Anda biasa temui. Tombol import dalam window visualisasi berfungsi untuk mengimpor visualisasi yang telah kita buat sebagai referensi data.
Selain dengan menggunakan window visualisasi interaktif Anda juga dapat menggunakan script yang langsung membuat simbologi Anda terkontrol sesuai dengan yang Anda inginkan. Caranya adalah dengan membuat code Map.addLayer menjadi berikut :
Map.addLayer(elevtumpang7 , {min: 0, max: 1000}, 'Tumpang Pitu');
Dengan code ini Anda telah membatasi simbologi minimal menjadi 0 m dan maksimal menjadi 1000 m. Hasilnya akan terlihat seperti di bawah ini :
Jika Anda berniat untuk memberikan palet warna, Anda dapat menambahkannya di belakang code sebelumnya menjadi :
Map.addLayer(elevtumpang7 , {min: 0, max: 1000, palette: ['blue', 'green', 'red']},
'Tumpang Pitu RGB');
Hasilnya akan terlihat seperti di bawah ini :
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