LANGKAH KERJA GAMBAR TEKNIK GEOLOGI 2023 ACARA 3: ANALISIS HIDROLOGI DAN GEOSTATISTIKA
Nama : Syifa Qolbi Rizqiana Kelas/ NIM : A / 21100120140118
Asisten acara : Lutfia Yasmin & Arief Achmad Akbar
Video 1 Analisis Hidrologi : 1. Masukin DEM
2. Project raster → input raster DEM → output coordinate masukin → Ok 3. Drag batas kavling → extract by mask → input project raster → feature mask
batas kavling → output save di file → Ok 4. Set kavling hollow → DEM uncheck
5. Search hydrology → fill → input surface extract by mask → output namain → Ok
6. Flow Direction → input hasil fill → output namain → Ok (north arrow) 7. Masukin RBI sungai yang udah di clip buat permudah pembacaan arah aliran
sungai
8. Flow accumulation → input flow direction → output namain → Ok (Akumulasi banyaknya air)
9. Watershed → input flow direction → input raster flow accumulation → output namain → Ok (Tangkapan air hujan)
10. Stream Order → input stream watershed → input flow flow direction → method Strahler → Ok (1 = sungai hasil percabangan, 2 hasil cabang dari 1.
Semakin kecil order sungai brrti sungainya di daerah hulu)
11. Basin → input flow flow direction → output namain → Ok (Nentuin DAS) 12. Ganti warna basin rainbow
13. Stream order taro atas basin buat tau per DAS punya order berapa
Video 2 Geostatistika :
1. Drag data kavling → hollow → properties sesuaiin koordinat
2. Drag tabel MAT → klik kanan sheet → display XY data → Z field ganti MAT → sesuaiin coordinate system → Ok
3. Search kriging (spatial analyst) → input point sheet1S events → Z value field MAT → output namain save .tif → environment → processing extent same as layer kavling → Ok
4. Sederhanakan nilai → properties kriging → symbology → classified → classify → method equal interval → classes 7 → break values ganti 1 angka di belakang koma → Ok → sederhanakan label 1 angka dibelakang koma → color ramp hijau pink → Ok
5. Ganti simbol sheet bulet jadi merah 6. Lakuin IDW sama spline cara sama
7. Search extract values to point (spatial) → input point data MAT → input raster kriging → output EVP_Kriging save → Ok
8. Table to excel (conversion) → input table EVP kriging → output RMS_Kriging → Ok
9. Buka excel di folder yang di save → hapus FID – Nama sumur kalo angka ngacak → copy data MAT awal lalu paste
10. Cari RMS → hitung selisih (raster values – data MAT) → kuadrat (selisih^2)
→ Average kuadrat → RMS ( =SQRT(average) )
11. Lanjut arc map → search contour (spatial) → input raster metode kriging → output contour_krig → contour interval 1 → environment → processing extent same as layer → Ok → ganti warna hitam → prop label → placement on the line → symbol halo → Ok
12. Layout → titik merah legendanya sumur MAT → masukin panah tegak lurus sm contour buat nunjukin arah aliran dari contour tinggi ke rendah.
