Slope & GAT & How to Save

Slope is calculated in ArcMap using elevation data. It is calculated using the Spatial Analyst Extension.

• First, ensure you have elevation data for your region. The higher your elevation precision, the higher your resulting slope precision will be.
• Here is a direct link to TNRIS' Arlington NED (30 meter)
• Second, ensure the Spatial Analyst extension is turned on. (Customize/Extensions)
  
• Third, ensure your XY coordinates are in the same units as your Z units. (We are fine for this example, just want to point it out
  
• Fourth, ArcToolbox/Spatial Analyst/Surface/Slope

• Download from TNRIS
• Use the collarless version for displaying purposes. Use the collared version for the legend information.

• File/Map Document Properties and you will see the checkbox for relative path names.

• Simple Site Selection Logic (intersects, union, merge, erase)
• Maps for Presentations (pretty maps)
• Georeferencing & Digitizing
• ArcGIS Online