26 Work with Attribute Table (1): Calculate statistics &

Our next step is to analyze the overall land use/land cover status in the study area. We have been inspecting the spatial data using visual aids, such as changing symbology and creating maps. In addition, we will now utilize tools for the attribute table of the spatial data to get statistics and calculate fields in percentages.

1. Right-click the NLCD2021_polygon_Dissolve, open Symbology, choose Unique Values in Primary symbology, and click Add all values: (figure)
2. Choose the Color scheme that fits your preference.

   Stop and inspect: Explore the dissolved NLCD2021 polygon and compare it with the original raster format NLCD image file. Find the difference between the raster and vector formats of LULC. Here is an example: (figure)

   Next, we will calculate the percentage of each NLCD category in Monroe County using the Calculate Field tool in the attribute table.

3. Open the NLCD2021_polygon_Dissolve attribute table (right-click NLCD2021_polygon_Dissolve and click Attribute Table)
4. First, find the total area of Monroe County. Right-click Shape_Area, and click Statistics: (figure)
5. Write down the Sum value in the Chart Properties.
6. Back to the NLCD2021_polygon_Dissolve attribute table, right-click Shape_Area, click Calculate Field, and fill in the parameters like the figure below: figure)

   Question 3 (1 pt.)

   What are the top FOUR land uses/land cover in Monroe County, and what percentages?