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Introduction to : ArcGIS

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Outline

Introduction Tabular Data

Spatial Data

Warming Up (1-3)

Delineating Basin Use of Hydrology Feature in ArcGIS

Need of Elevation Data for input

Knowing Basic Components of DEM

Analyzing Data Based on Spatial Zonal Statistics

Thiessen

Kriging

Field Calculator

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Introduction

Tabular Data and Spatial Data : ArcGIS

ArcGIS and supporting program :

Global Mapper

Google Earth

etc

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Tabular Data and Spatial Data

Tabular Data

Table (Excel)

Database (Access)

etc.

Spatial Data:

Coordinate (x, y, and z)

Projection (Lat.-Lon. , UTM, etc)

Merge between Tabular and Spatial : ArcGIS

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View of Arc GIS

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View of Global Mapper

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View of Google Earth

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Catalog

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New > Shapefile

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Name, Feature Type, Spatial Ref.

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New Layer : St_Cemara

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Editor > Start Editing

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Create Features > .. > XY

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Open Attribute Table > Fields

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Warming Up (2)

Input Tabular Data to Spatial

Add Data : St_list_yearly_rf.xlsx

Display XY data

Data > Export Data

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Add Data

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Choose Tabular Data

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New Layer : St_list_yearly_rf.xlsx

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Open > Table

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Display XY Data

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X Field, Y Field, Coordinate Sys.

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Spatial Data Displayed

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Data > Export Data

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Export Data to SHP

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Warming Up (3)

Join Spatial Data with Tabular Data

Add SHP data

Add Tabular Data

Join and Relates > Join

Choose the field in layer SHP, Choose the Tabular

Data, choose the field in tabular data

Join Options

Open Attribute Table > Data was joined

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Join and Relates

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Delineating Basin

Use of Hydrology Feature in ArcGIS

Arc Toolbox > Spatial Analyst Tools > Hydrology

Need of Elevation Data for input

Hydro-1K

SRTM

Knowing Basic Components of Digital

Elevation Modeling (DEM)

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Elevation Data

Hydro 1K

Cellsize : 1 km x 1 km

.

.

SRTM

Cellsize : 90 m x 90 m

.

.

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Basic Components of DEM

Aspect The direction of maximum rate of change in the elevations

between each cell and its eight neighbors (vary from 0 to360).

Flow Directions The direction of flow from each cell in the DEM to its

steepest down-slope neighbor (vary from 1 to 255).

Flow Accumulations

The amount of upstream area draining into each cell. Slope

The maximum change in the elevations between each celland its eight neighbors.

Compound Topographic Index (CTI)

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Delineating Basin

Add Data : Elevation (SRTM, Hydro-1K, etc)

Define Projection

Fill

Flow Direction

Flow Accumulation

Reclassify

Snap Pour Point

Generate Watershed

Extract by Mask

Generate Sub-Watershed

Raster to Polygon

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Add Data

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SRTM Data

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Data Management Tools > Projections and Transformations >

Define Projection

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Spatial Analyst Tools > Hydrology > Fill

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Fill

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Flow Direction

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Spatial Analyst Tools > Hydrology > Flow Accumulation

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Flow Accumulation

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Spatial Analyst Tools > Reclass > Reclassify

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Reclassified Flow Accumulation

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Spatial Analyst Tools > Hydrology > Snap Pour Point

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Pour Point Snapped

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Spatial Analyst Tools > Hydrology > Watershed

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Watershed

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Spatial Analyst Tools > Extraction > Extract by mask

(to Reclassified Flow Accumulation)

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Watershed with Reclass. Flow Acc.

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Generate Sub Watershed : Stream Link as Pour Point

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Analyzing Data Based on Spatial

Zonal Statistics (ex. : Land-cover)

Thiessen (ex. : Daily Rainfall Data)

Kriging (ex. : Yearly Rainfall Data)

Field Calculator (ex. : Calc. Flood Discharge)

Raster Calculator (ex. : USLE-Sedimentation)

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Zonal Statistics

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Create Thiessen Polygons

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Kriging

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Field Calculator

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Raster Calculator