Run Analysis & Update Metadata

Calculate Geometry 

As of Pro 2.9, the Calculate Geometry tool provides both Geodesic and Planar options. Geodesic calculations may differ slightly from planar calculations for very large fires. Discuss with the incident SITL if there is any doubt in which to use, consistency is key when reporting.

Acres

1. From the attribute table, select the features to update geometry and right-click the Acres column header and select Calculate Geometry.
   
2. The Calculate Geometry window will open.
   Select Acres as the Field and International Acres as the Area Unit.
   Select Area for a planar calculation or Area (geodesic) for a geodesic calculation.
   Populate the Coordinate System to the local Projected Coordinate System.
   

Length

1. From the attribute table, select the features to update geometry and right-click the Acres column header and select Calculate Geometry.
   
2. The Calculate Geometry window will open.
   Select LengthFeet as the Field and Feet as the Area Unit.
   Select Area for a planar calculation or Area (geodesic) for a geodesic calculation.
   Populate the Coordinate System to the local Projected Coordinate System.
   

Calculate Geometry with Python

In earlier version of Pro, it was sometimes necessary to use a Python expression to calculate feature geometry. Geodesic calculations may differ slightly from planar calculations for very large fires. Discuss with the incident SITL if there is any doubt in which to use, consistency is key when reporting.

Calculate Area and Length with Python

These calculations will use the spatial reference of the feature class, not the map frame.

1. Open the layer attribute table, select the features to update geometry, right-click the Acres or LengthFeet field, and select Calculate Field. Alternatively, click Calculate, and select Acres as the field name in the Geoprocessing pane.
   
   
2. Enter !shape.geodesicArea@acres! into the expression field and click Run to calculate the geodesic are of the feature(s) in acres.
   Enter !shape.geodesicLength@FeetInt! into the expression field and click Run to calculate the geodesic length of the feature(s) in feet.

​
​

Calculate Latitude and Longitude in WGS84DDM with Python

These calculations are independent of the spatial reference of the feature class and the map frame. The resulting coordinates will be WGS84 Degrees Decimal Minutes rounded to 3 places.

1. Open the layer attribute table, select the features to update geometry, right-click the Acres or LengthFeet field, and select Calculate Field. Alternatively, click Calculate, and select Acres as the field name in the Geoprocessing pane.
   
   
2. In the Calculate Field pane, click the Import button below the Code Block box.
   
3. Navigate to and select the calculate_Lat.cal expression file (located in the tools folder).
   
4. This will populate the expression and code block with the necessary script to calculate Latitude in WGS84 DDM. Click Run. If the error “Parameter is missing or invalid” is returned, click within the Code Block window and try again.
   
   
   
5. Repeat the same steps for the Longitude field but select the calculate_Long.cal expression file instead.
6. The Latitude and Longitude fields will now be populated.
   

Acreage Burned by Ownership

Prior to calculating the acreage by ownership, a polygon dataset of land ownership will need to be acquired. County level parcel data is often the most accurate; however, national datasets can be used as well. Most common is the “Surface Management Agency” data from the Bureau of Land Management (BLM) (https://gbp-blm-egis.hub.arcgis.com).

1. With the ownership data added to the map, open the Geoprocessing pane, search for, and open the Clip tool.
   
2. Enter the Ownership data as the Input Features, Event Polygon as the Clip Features, and save it to an appropriate location following GeoOps naming.
   
3. Open the resulting feature class’ attribute table and add a field.
   
4. Name the field Acres and set the Data Type to Double. Click Save on the Ribbon.
   
5. Calculate the Acres field.
   

Note: If the ownership data has multiple polygons for the same owner, Summary Statistics or Dissolve can be used to combine them.

Line Distance by Feature Category

Calculate the amount of line in the field by type.

1. After calculating the LengthFeet field, right-click Feature Category, and select Summarize.
   
2. The Summary Statistics window will open.
   Enter LengthFeet and Sum as the Field and Statistic Type. Set the output to the Other Incident Data gdb or an appropriate folder and name following GeoOps standards. Click OK.

Percent Containment

The percent containment of a fire is generally the percentage of fire edge that Ops has designated as Contained. Always check with the SITL before publishing or printing anything that displays percent containment.

There are many methods and custom tools to calculate containment. The simplest way is to open the Chart provided with the Perimeter Line after calculating the LengthFeet field and syncing the Offline Copy.

1. To calculate from the polygon, on the Map tab of the ribbon, in the Inquiry section, select Measure Features from the Measure dropdown.
   
2. Set the Distance Units to Feet under the Options and click on the current Wildfire Daily Perimeter.
   
3. If there are multiple polygons, click each, and the Sum portion will add them together.
4. Take the total length of Contained features from performing a Line Distance Summary operation described above on the Perimeter Line feature class and divide that by the total Perimeter from the measure tool. E.g. 7753 / 71,798 = .1079 or 10.8%.