Creating a Personal Geodatabase

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Download base image

 

  1. Open ArcCatalog
  2. Create a new workspace folder
  3. Right-click on the new folder and select new Personal Geodatabase – name it Geology
    1. Right-click the new Personal Geodatabase and choose new Feature Dataset – name it GeoFeatures
    2. Select Import and use the base image for the coordinate system
    3. Select the defaults until finished

                                                    i.     Right-click on the new Feature Dataset and choose new FeatureClass – name it Lithology use Polygon geometry

                                                  ii.     Add two new text fields called “Description” and “Abbrev”

                                                iii.     Finish

 

Finish the Personal Geodatabase by adding a “Faults” Feature Class (line geometry) with one new field named “FaultType”

 

  1. Right-click the Feature Dataset and create new Topology (enter a cluster tolerance of 1 when prompted and add “Must Not Overlap” and “Must Not Have Gaps” when prompted to add rules.

 

Geology Map

 

  1. Open ArcGIS and add the base image (flv_geo.tif) first followed by the Lithology and Faults feature classes.
  2. Digitize polygons as shown in class – add the abbreviation for each polygon to the “Abbrev” field as you digitize – the abbreviations can be used after polygon digitizing is completed to calculate the “Description” field values. Use the following descriptions:

 

Qa = Quaternary alluvium

Qoa = Quaternary alluvium, older

QTc = Quaternary and Tertiary alluvium

Ts = Tertiary densely welded tuff

Trat = Tertiary non-welded tuff

 

  1. Now digitize the faults using the varying symbology on the base image as a guide to segmentation
  2. Add attributes as follows for each fault segment:

 

Solid lines = Normal fault – definitely located

Dashed lines = Normal fault - approximately located

Dotted Lines = Normal fault = concealed

 

Now make a map that is cartographically correct. Use the lithologic abbreviations in the Lithology feature class table to annotate the polygons and then give each rock type a color fill. Give faults an appropriate symbol and finally add a grid (labels only), a north arrow, a scale bar, and a legend.