Project 3. Topology in Geodatabase (15 points)
1. Objectives
The goal of this project is to design and create a topologically consistent geodatabase over the Purdue campus area, with the following objectives
· Digitize and edit point, line and polygon features
· Create a topologic consistent geodatabase
2. Data provided or to be used
· Tutorial for ArcGIS Editing and related data for an easy start.
· A shapefile (named as Assignment) with a number of polygons, each of which defines the working area of a classmate. Note: One classmate may be assigned to more than one polygon area.
· Indiana Stata ortho-rectified images over Purdue campus and its vicinity
· Note – you may also use the base map service provide by ArcGIS.
3. Tasks
· Build the geodatabase
· Clean/correct the provided assignment shapefile so that it is geometrically ‘accurate’ and topologically consistent
· Digitize all polygon (the land cover layer) features and linear (the street/road layer) features within your assignment area(s).
· Check/correct the topology within the landcover layer, within the street layer, and between the two layers.
4. Suggested procedure
1) Create the personal geodatabase with domain properties setup
· Define land cover types: Buildings, Water, Pavement (for Road), Parks (including large areas of lawns and trees ), Bare land (including parking and small trees and lawns etc.), Others (all as one type)
· Define Road types: Street, County Road, State Road, InterState, Others.
2) Create a feature dataset (e.g. Digitization) with spatial reference NAD 83 UTM 16N. Setup metric in meters.
3) Add relevant Esri Base Map services to ArcMap if needed
· In ArcMap, choose Add Data > Add BaseMap. You may search and choose the following service layers when needed
· County Ortho
· OpenStreetMap
· Streets_Centerlines_IDHS
4) Clean the provided Assignment shapefile by using the County Ortho as bkgrd
Project 3. Topology in geodatabase
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1
· Import the provided Assignment shapefile as a feature class. Create a Topology for the Assignment feature class under appropriate rules.
Evaluate the topological inconsistence, if any.
· Import other data into the Digitization feature dataset as needed.
· Use Editor and Topology (under the Standard Menu bar of ArcMap) to clean the Assignment feature class
· Save the edited Assignment feature class (version 1) and re-generate its Topology (version 1).
· Repeat the above two steps (editing and topology check) until satisfactory results are reached.
5) Digitization of your assigned working area
· Under the Digitization feature dataset, create a polygon feature class (e.g.
Land Cover). Associate its attributes to the domain properties of the database.
· Digitize the land cover and assign its type by using the domain properties o Repeat the topology check in 4) for your digitized land cover feature class o Apply topology check between your assigned working area and the land
cover
· Repeat the above steps for digitizing the roads in your working area. Note: roads may be digitized as central line
· Check the topology of all three layers: your working area, land use, and roads.
5. Bonus tasks (max 2 additional points)
· Find an assignment area(s) that is next to yours and merge its digitization to yours to form a correct and consistent dataset.
6. Report and submission
· A lab report of max 2 pages that
· Presents your database design, topology rules and their effects, examples of your digitization
· Discuss issues and your solutions
· Other submissions
· Your geodatabase and your mxd file (please save it with ‘relative path’).
· For each digitized feature class (land use and street layers), submit the original digitization results (version 0), the final cleaned results, and the Topology of the final results (version n).
· All submissions in one zipped file.