The document discusses digitization using ERDAS software. It explains how to open ERDAS, import a raster image, and create new vector layers as shapefiles to digitize polygon, line, and point features from the raster image. For each feature type, the user selects the shapefile type, uses the vector toolbox to draw the features, and generates an output file depicting only that feature type. It concludes by mentioning the ability to combine all digitized layers.

1. DIGITIZATION USING ERDAS
By
SWETHA.A
5WD12CGI15

2. Run ERDAS software
 Open a new viewer i.e. viewer1


3. 
Open a Raster image(JIFF Format)

4. 
Open a new vector layer

5. POLYGON FEATURE DIGITIZATION

6. 
Make sure to open the new vector layer in
.shp (shapefile) format and name it.

7. 
Select shapefile type as polygon.

8. 
Vector tool box appears as shown below..

9. 
Use
symbol to draw polygon features which are
present on satellite image.

10. 
Output file only with polygon features are depicted.

11. LINE FEATURE
DIGITIZATION

12. 
Make sure to open the new vector layer in
.shp (shapefile) format and name it.

13. 
Select shapefile type as “Arc Shape(Line)”.

14. 
Vector tool box appears as shown below..

15. 
Use
symbol to draw line features which are
present on satellite image.

16. 
Output file only with Line features are depicted.

17. POINT FEATURE
DIGITIZATION

18. 
Make sure to open the new vector layer in
.shp (shapefile) format and name it.

19. 
Select shapefile type as “Arc Shape(Line)”.

20. 
Vector tool box appears as shown below..

21. 
Use
symbol to draw line features which are
present on satellite image.

22. 
Output file only with „Point‟ features are depicted.

23. COMBINATION OF ALL LAYERS

24. THANKS