KEMENTERIAN PENDIDIKAN DAN KEBUDAYAAN

UNIVERSITAS GADJAH MADA

FAKULTAS TEKNIK JURUSAN TEKNIK GEOLOGI

LABORATORIUM SUMBERDAYA MINERAL

LAPORAN PRAKTIKUM GEOINFORMASI

ACARA: SURFACE HYDROLOGY TOOL

DISUSUN OLEH :

RIZAL ASHARI

12/330207/TK/39391

ASISTEN ACARA :

DEVY RIZKY PANJI WIJAYA

ALOYSIUS DEARGA PURBO WASKITA

YOGYAKARTA

MEI

2014

Resume Pembuatan Peta Pola Penyaluran

1. Membuka Arcmap. Add data kontur kavling dan batas kavling pemetaan.

2. Buka Spatial Analyst Tools > Interpolation > Topo to Raster.

Input feaature data = pilih kontur

Output surface raster = Rasterkont

Klik Ok

Tampilan :

3. Jalankan Spatial Analyst Tool > Hidrology > Fill

Input surface raster = pilih Rasterkont

Output raster = pilih elevfill

Klik Ok

Tampilan :

4. Buka Spatial Analyst Tool > Hidrology > Flow Direction

Input surface raster = pilih elevfill

Output flow direction raster = elevflow

Klik Ok

Tampilan :

5. Buka Spatial Analyst Tool > Hidrology > Flow Accumulation

Input surface raster = pilih elevflow

Output flow direction raster = elevvacum

Klik Ok

Tampilan :

6. Buka layer elevvacum > symbology > Classified. Ubah input :

Classification = Manual

Classes = 5

Klik Classify

Masukkan 4 nilai pertama Break Value = 10, 70, 200, 500

Klik Ok

7. Buka Spatial Analyst Tool > Conditional > Set Null

Input Conditional Raster = pilih elevvacum

Input false raster or constant value = 1

Output raster = tulis strmnet

Expression = tulis Value LT 70

Klik Ok

Tampilan :

8. Buka Spatial Analyst Tool > Hidrology > Stream Link

Input stream raster = pilih strmnet

Input flow direction raster = pilih elevflow

Output Raster = tulis strmlink

Klik Ok

Tampilan :

9. Buka Spatial Analyst Tool > Hidrology > Stream Order

Input stream raster = pilih strmlink

Input stream direction = pilih elevflow

Output raster = tulis strmorder

Method of stream ordering = pilih STRAHLER

Tampilan :

10. Buka Spatial Analyst Tool > Map Algebra > Single Output Map Algebra

Map Algebra Expression = SETNULL (strmorder EQ 1 AND

strmlink.Count LE 5, strmlink)

Output raster = tulis strmedit3

Tampilan :

11. Buka Spatial Analyst Tool > Hidrology > Stream to Feature

Input stream raster = pilih strmedit

Input stream direction = pilih elevflow

Output raster = tulis streams3

Simplify polylines = default of checked

Klik Ok

Tampilan :

12. Buka Spatial Analyst Tool > Hidrology > Basin

Input stream raster = pilih elevflow

Output raster = tulis basins

Klik Ok

Ubah symbology menjadi unique value

Set Transparancy menjadi 35 %

Tampilan :

13. Buka Spatial Analyst Tool > Surface > Hillshade

Input Raster = pilih Rasterkont

Output Raster = tuliskan hillshede

Klik Ok

Buka properties hillshede, pada tab symbology ganti menjadi standard

deviation dan n = 2. Lalu klik Ok

Tampilan :

14. Buka Spatial Analyst Tool > Generalization > Region Group

Input raster = pilih strmnet

Output raster = strmgroup

Number of neighbors to use = EIGHT

Klik Ok

Tampilan :

15. Buka Spatial Analyst Tool > Zonal > Zonal Statistics

Input Raster = pilih strmgroup

Zone field = pilih Value

Input Value Raster = pilih elevvacum

Output raster = flowmax

Statistics type = Maximum

Ignore NoData in Calculations = Defaults of Checked

Klik Ok

Tampilan :

16. Buka Spatial Analyst Tool > Map Algebra > Single Output Map Algebra

Map Algebra Expression =CON (elevvacum EQ flowmax, strmgroup)

Output Raster = pourpoint1

Klik Ok

17. Buka Spatial Analyst Tool > Local > Combine

Input Raster = pilih pourpoint1

Input Raster = pilih elevvacum

Output Raster = pourpoint2

Klik Ok

18. Buka attribute table pourpoint2, sort descending pada kolom elevvacum.

Lalu pilih 2 data teratas.

19. Buka Spatial Analyst Tool > Hidrology > Watershed

Input flow direction = pilih elevflow

Input raster = pilih pourpoint2

Pour point field = pilih pourpoint1

Output raster = tulis watershed

20. Buka Spatial Analyst Tool > Hidrology > Flow Length

Input flow direction raster = pilih elevflow

Output raster = flowlength

Direction of measurement = pilih DOWNSTREAM

Input weight raster = default of nothing

Klik Ok

Tampilan :

21. Atur tampilan dengan menampalkan layer streams3, flowlength

(transparency 50 %) dan paling bawah berupa later hillshede.

Tampilan :

22. Atur layout sesuai keinginan agar terlihat menarik.

Tampilan layout akhir :