1. Hazards Planning and Risk Management
Lecture No. 07
GIS Lab 2
Fall 2016
US – Pakistan Center for Advanced Studies in Water

2. Learning Objectives
Using arcgis How to Digitize create a gis layer from tabular data geo-reference an image

3. Digitizing - Buildings - Roads
Digitize on rectified image

4. Creating and Adding New Layers
Create New feature layers through ArcCatalog
Polygon – for Buildings
Feature class name = Buildings
Add Field ‘Building_Type
Line – for roads
Feature class name = Roads
Add Field ‘Road_Type’
Add New feature layers in ArcMap

5. Digitizing Roads

6. Creating Templates
Right click Roads layer, go to properties > symbology > categories > unique values
Value Field = Road_Type
Add Values
Highways
Roads
Local Roads
OK, OK (symbology window)

7. Organizing Template
Editor > Editing Window > Organize Feature Template (Create Feature window)
Select ‘Roads’
Click ‘New Template’
Check Layer ‘Road’
Next
Check Template Names
√ Highways, √ Roads, √ Local Roads
Finish
Close ‘Organize Feature Template’

8. Start Digitizing
Select type of Road (Highway, Roads, or Local Roads) from ‘Create Feature’ window
Click the starting point (snapping is on as a default)
Keep clicking along the road by adding vertices
At finish point either
Double click
Click F2
Right click > Finish Sketch
Select another template and create sketch

9. Digitizing Buildings

10. Class Assignment
Digitize buildings in the image

11. processing tabular data

12. Look at Google Earth Image

13. Look at Google Earth Image

14. Converting XY Table into Point Feature Class
Get longitude (X) and Latitude (Y) from Google Earth

15. longitude (X) and Latitude (Y) from Google Earth
Save in Excel
Convert in Decimal Degree format
Add Excel worksheet in ArcMap
Add Data > Add XY Data (geographic coordinate system, WGS 1984)
Select a coordinate system for the data
Points will be drawn as an event theme in ArcMap

16. Convert the event theme to a shapefile or geodatabase feature class
Right-click the file name, select Data > Export Data
Points can be exported to a geodatabase feature class or to a shapefile
Re-project to the UTM coordinate system

17. georeferencing

18. Georeferencing Save Google Earth Image (jpeg)
Select Ground Control Points (GCP)
At least 3 points are required for Affine (1st Order polynomial transformation)
Add Georeferencing tool bar
Apply ‘Fit to Display’ on the image
Add GCPs
Update Georeferencing when satisfied
Rectify for permanent transformation