Advanced GIS Assignment

8/13/2019 Advanced GIS Assignment

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Master of Science in Information Technology

for Natural Resources Management

Advanced GIS:

Ci Mandiri Watershed Characteristic

Jarot Mulyo Semedi

G051080111


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ITM 542 Advanced GIS

Outline

Ci Mandiri Watershed

Data Used for Application

Data Preparation

Watershed Characteristic:Flow Direction

Watershed Characteristic:Flow Accumulation

Watershed Characteristic:Stream Network

Watershed Characteristic:Stream Link

Watershed Characteristic:Sub-WatershedDeliniaton

Watershed 3D Perspective


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Ci Mandiri Watershed (1)

Located in Sukabumi Regent, southern West

Java.

This watershed has two upstream; Mount

Gede-Pangrango Complex in the north east

and Mount Salak in the north, and flowing

south to Palabuhanratu gulf.

Very famous because of its river rafting

activity and mystical Palabuhanratu area.

This watershed is formed by the famous Ci

Mandiri fault which stretching 100km from

Palabuhanratu to Padalarang


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Ci Mandiri Watershed (2)

Has the total area of 194.735,5 Ha, consist of:

Water = 987,30 Ha

Bushes = 29.556,70 Ha

Buildings = 274,29 Ha

Forests = 30.379,24 Ha

Plantations = 52.432,67 Ha

Settlement = 17.681,26 Ha

Grass/Open Area = 1.284,03 Ha

Irrigated Rice = 14.905,12 Ha

Non-Irrigated Rice = 14.290,02 Ha

Rocky Soil = 2,95 HaMoor/Field = 32.942,15 Ha

It is affected by the tropical climate with thetemperature ranging from 26oC - 28oC, and meanannual rainfall of 2500mm.


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Data Used for Application (1)

ASTER GDEM 30m resolution data

downloaded from NASA Warehouse Inventory

Search Tool (WIST).

(https://wist.echo.nasa.gov/~wist/api/imswelc

ome/)
https://wist.echo.nasa.gov/~wist/api/imswelcome/https://wist.echo.nasa.gov/~wist/api/imswelcome/https://wist.echo.nasa.gov/~wist/api/imswelcome/https://wist.echo.nasa.gov/~wist/api/imswelcome/


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1 : 25.000 Landuse data from BAKOSURTANAL


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Java Island watershed boundary from

http://banyudata.blogspot.com/search/label/

Hidrologi
http://banyudata.blogspot.com/search/label/Hidrologihttp://banyudata.blogspot.com/search/label/Hidrologihttp://banyudata.blogspot.com/search/label/Hidrologihttp://banyudata.blogspot.com/search/label/Hidrologi


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Data Preparation:Clipping data to Ci Mandiri Watershed

Ci Mandiri Watershed mask created from Java

Island Watershed Boundary.

30m GDEM extracted using Ci Mandiri

Watershed boundary as mask

select

Extract by

Mask Ci Mandiri DEM

Ci Mandiri

Watershed


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Data Preparation:Clipping data to Ci Mandiri Watershed

Java Island landuse data clipped using Ci

Mandiri Watershed boundary

Clip

Ci Mandiri

Landuse


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Data Preparation:Creating Depressionless DEM

Removing Sink and Peak caused by DEM

inconsistent value

Fill Sink

Ci Mandiri DEM Ci Mandiri Filled DEM


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Data Preparation:Creating Hillshade Perspective

Computes hillshade values for a raster surfaceby considering the illumination angle andshadows using filled DEM. It does this bysetting a position for a hypothetical lightsource and calculating the illumination values

of each cell in relation to neighboring cells. Itcan greatly enhance the visualization of asurface for analysis or graphical display,especially when using transparency.

Compute

Hillshade

Ci Mandiri Filled DEM Ci Mandiri Hillshade


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Watershed Characteristic:Flow Direction

The direction of flow is determined by the

direction of steepest descent from each cell.

This is calculated as:

[change in z-value / distance * 100]

Compute Flow

Direction

Ci Mandiri Filled DEM Ci Mandiri Flow

Direction


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Watershed Characteristic:Flow Accumulation

The Flow Accumulation function calculates

accumulated flow as the accumulated weight

of all cells flowing into each downslope cell in

the output raster.

Compute Flow

Accumulation

Ci Mandiri Flow

Direction

Ci Mandiri Flow

Accumulation

d d


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Watershed Characteristic:Stream Network

Stream networks can be delineated from a

digital elevation model (DEM) using the output

from the Flow Accumulation function. Flow

accumulation in its simplest form is the

number of upslope cells that flow into eachcell. By applying a threshold value to the

results of the Flow Accumulation function

using Map Algebra, a stream network can be

delineated.

Ci Mandiri Flow

Accumulation

Map Algebra

Formula

Ci Mandiri Stream

Network

ITM 542 Ad d GIS


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Watershed Characteristic:Stream Link

Links are the sections of a stream channel

connecting two successive junctions, a

junction and the outlet, or a junction and the

drainage divide.

Ci Mandiri Stream

Network

Ci Mandiri Flow

Direction

Ci Mandiri

Stream Link

ITM 542 Ad d GIS


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Watershed Characteristic:Sub-Watershed Delineation

A watershed is an area that drains water and

other substances to a common outlet as

concentrated drainage. Other common terms

for a watershed are basin, catchment, or

contributing area. This area is normallydefined as the total area flowing to a given

outlet or pour point.

Ci Mandiri Flow

Direction

Ci Mandiri

Stream LinkCi Mandiri

Sub-

Watershed

ITM 542 Ad d GIS


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Watershed 3D Perspective:Landuse (1)

Ci Mandiri HillshadeCi Mandiri Landuse

Ci Mandiri Landuse With

Hllshade perspective

Combination between

Transparent Landuse

layer overlayed with

Hillshade can give

good perspective inlooking the location of

landuse with their

slope.



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Watershed 3D Perspective:Landuse (2)

NS

WE

View to the north View to the south

View to the west View to the east



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Watershed 3D Perspective:Sub-Watershed (1)

Combination between

Transparent Landuse

layer overlayed with

Hillshade can give

good perspective inlooking the location of

landuse with their

slope.

Ci Mandiri HillshadeCi Mandiri Sub-Watershed

Ci Mandiri Sub-Watershed With

Hllshade perspective



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Watershed 3D Perspective:Sub-Watershed (2)

NS

WE

View to the north View to the south

View to the westView to the east



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Advanced GIS Assignment

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