Training ArcGIS

Introduction to : ArcGIS

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

Introduction • Tabular Data and Spatial Data : ArcGIS • ArcGIS and supporting program : – Global Mapper – Google Earth – etc

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

View of Arc GIS

View of Global Mapper

View of Google Earth

Warming Up (1) • Make a SHP data – Catalog > Home > New Shapefile – Name, Feature Type, Spatial Reference – Editor > Start Editing – Create Feature > Construction Tools > Point – Absolute X, Y > Input Coordinate – Stop Editing > Save Edits – Open Attribute Table – Fill in the Fields, Join, or Relates

Catalog

New > Shapefile

Name, Feature Type, Spatial Ref.

New Layer : St_Cemara

Editor > Start Editing

Create Features > .. > XY

Open Attribute Table > Fields

Warming Up (2) • Input Tabular Data to Spatial – Add Data : St_list_yearly_rf.xlsx – Display XY data – Data > Export Data

Add Data

Choose Tabular Data

New Layer : St_list_yearly_rf.xlsx

Open > Table

Display XY Data

X Field, Y Field, Coordinate Sys.

Spatial Data Displayed

Data > Export Data

Export Data to SHP

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

Join and Relates

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)

Arc Toolbox > Spatial Analyst Tools > Hydrology

Elevation Data • Hydro 1K – Cellsize : 1 km x 1 km – …. – ….

• SRTM – Cellsize : 90 m x 90 m – …. – ….

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 to 360).

• 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 cell and its eight neighbors.

• Compound Topographic Index (CTI)

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

Add Data

SRTM Data

Data Management Tools > Projections and Transformations > Define Projection

Spatial Analyst Tools > Hydrology > Fill

Fill

Spatial Analyst Tools > Hydrology > Flow Direction

Flow Direction

Spatial Analyst Tools > Hydrology > Flow Accumulation

Flow Accumulation

Spatial Analyst Tools > Reclass > Reclassify

Reclassified Flow Accumulation

Spatial Analyst Tools > Hydrology > Snap Pour Point

Pour Point Snapped

Spatial Analyst Tools > Hydrology > Watershed

Watershed

Spatial Analyst Tools > Extraction > Extract by mask (to Reclassified Flow Accumulation)

Watershed with Reclass. Flow Acc.

Generate Sub Watershed : Stream Link as Pour Point

Analyzing Data Based on Spatial • • • • •

Zonal Statistics Thiessen Kriging Field Calculator Raster Calculator

(ex. : Land-cover) (ex. : Daily Rainfall Data) (ex. : Yearly Rainfall Data) (ex. : Calc. Flood Discharge) (ex. : USLE-Sedimentation)

Zonal Statistics

Create Thiessen Polygons

Kriging

Field Calculator

Raster Calculator