This brings the largest polygons to the top of the table. Notice that the largest areas are for uplands, and area outside the mapping jurisdiction for these data, coded “U”, “Out”, in this case, in Wisconsin. We will be classifying the polygons by their size, which is contained in the “Area” attribute. Left click on the dropdown in the upper left corner, below the word Table. You may need to expand the window to the right to view the button. Then left click on in the dropdown menu Select By Attributes This opens a query builder. You select a Method at the top (for this Lab use a “Create new selection”). You use the items listed in the second pane with the operation buttons listed below it to build an expression in the bottom pane. This expression is applied to the data table to select features. In the Select by Attributes box, 1) double click on the “Wet_type” field, 2) single click on the = button, 3) double click on the button, “Get unique Values” 4) scroll to and double click on the “Out” value. Your selection expression should appear as shown to the right. Remember to use the buttons on the menu to compose the selection expression, e.g., the = in a selection via the keyboard is possible, “Wet_type” Out”. Typing but it is easy to make mistakes which cause syntax errors. Click Apply. This selects all the records in the file that have the code. “Out”
This brings the largest polygons to the top of the table. Notice that the largest areas are coded “U”, for uplands, and “Out”, area outside the mapping jurisdiction for these data, in this case, in Wisconsin. We will be classifying the polygons by their size, which is contained in the “Area” attribute. Left click on the dropdown in the upper left corner, below the word Table. You may need to expand the window to the right to view the button. Then left click on Select By Attributes in the dropdown menu This opens a query builder. You select a Method at the top (for this Lab use “Create a new selection”). You use the items listed in the second pane with the operation buttons listed below it to build an expression in the bottom pane. This expression is applied to the data table to select features. In the Select by Attributes box, 1) double click on the “Wet_type” field, 2) single click on the = button, 3) double click on the “Get unique Values” button, 4) scroll to and double click on the “Out” value. Your selection expression should appear as shown to the right. Remember to use the buttons on the menu to compose the selection expression, e.g., the “Wet_type” = Out”. Typing in a selection via the keyboard is possible, but it is easy to make mistakes which cause syntax errors. Click Apply. This selects all the records in the file that have the “Out” code.