GIS Survey Class
Summer Intensive
Assignment 4: Screen Digitizing to create a new feature map from an image theme
I realize that for some of you this seems like a lot of materials being presented. However, do your best. If you have problems turn-in whatever you managed to complete.
Assignment Requirements:
Part 1: Activities
1. Digitize at least 2 polygons, 2 lines, and 2 point features and convert them to shapefiles. These features can be anything within the bounds of the aerial photos (data location is J:\Echo\saldata\data_bham\data_airphoto\1997_color\ ) – make sure in ArcView that the "data source types" are set to "image data source" – this tells ArcView to look for raster based images not features.
2. Make a complete map showing all six shapefiles (2 points, 2 lines, 2 polygons) by using the Layout command. Make sure that all shape files stand out (i.e. the lines are thick enough and point symbols large enough to see in the printed copy of the layout). Also, be sure under View/Properties to set the Map Units to feet and also the Distance Units to feet.
Part 2: Write Up
1. Objective:
- What is the purpose of your map?
- What features did you digitize? Why these?
2. Definitions (provide definitions and discussion for each of the following):
- On screen digitizing - What is it and what is it used for?
- Shape files – What are they? How are they used?
- Image files -- What are they? How do they differ from shape files?
3. Raw Map Work: Print a "screen dump" of you View frame once you have completed your digitizing
4. Final Map: From your Layout, create a very neat, concise, complete and clear final map.
5. Discussion: What is contained in your final map and how does this meet your objectives. In a couple of sentences discuss this.
6. Critique: In a couple of sentences critique your final work addressing issues such as:
- Did you have any problems?
- Are the results what you expected?
- How could you improve your map?
7. ProcLib: Write a short ProcLib for creating and adjusting the Scale Bar on your final map.