14. Overlay Analysis OcNatForest Dataset


Consider the conservation easement map request we looked at Monday…
“Special Natural Areas” (SNA): all hardwoods and all areas within the riparian buffer
– riparian buffer: 400′ around all features in the rivers layer
– 300′ around “Lake/Pond”, “Reservoir”, and “Stream/River” features in the lake layer
“Mature Forest Envelope” (MFE):
– Areas not in SNA
– pine stands with an age >= 6 with a volume/acre (cuft) > 500
– mixed stands with an age >= 22
“Regenerating Forest Envenope” (RFE):
– Areas not in SNA
– Areas not in MFE
– Remaining pine and mixed stands
“Agriculture Envelope” (AE):
– all areas not in SNA
– all areas not in MFE
– all areas not in RFE
This is how we’re going to address this problem
  1. Open a new instance of ArcMap, save the project in your C:\ Drive workspace
  2. Load all of the layers in the Week13_ManagementArea1 file geodatabase.
  3. Save your project (control-s)
  4. Add the tloOverlayAnalysisToolbox.tbx to the project
    • Open ArcToolbox
    • Right-click on the ArcToolbox (the top-most entry in the ArcToolbox) > Add Toolbox
    • Navigate to your C:\ Drive workspace and select tloOverlayAnalysisToolbox and hit Open
    • You should now see a new toolbox called tloOverlayAnalysisToolbox in the ArcToolbox listing
  5. Open the 1_Special_Natural_Areas tool for editing
    • Expand the tloOverlayAnalysisToolbox to reveal the 1_Special_Natural_Areas tool
    • Right-click > Edit
    • CREATE A NEW FILE GEODATABASE IN YOUR WORKING DIRECTORY; CALL IT eo_work
    • Double-click the top workspace object in the model and set it to the eo_work FGDB you just created

<…. Me Talking…>

  • Add a new TEXT field to the Stands_Ecological_Easement layer called “EaseClass”
  • Start Editing
  • Query for SNA (All areas in a river or lake buffer):
    (specie = 'Hardwood') OR (FID_Rivers_utm1617_Clip_AllBuffers_Work <> -1)
  • Use the Field Calculator to populate the EaseClass field (selected records) with “SNA”
  • Query for MFE (Not SNA, Pine and Age >=6 with vol > 500, mixed and age >= 22):
    (EaseClass IS NULL) AND (( specie = 'Pine' AND age >=6 AND cuft >= 500) OR ( specie = 'Mixed' AND age >=22))
  • Use the Field Calculator to populate the EaseClass field (selected records) with “MFE”
  • Query for RFE (NOT SNA or MFE, Pine, mixed):
    EaseClass IS NULL AND ( specie = 'Pine' OR specie = 'Mixed')
  • Use the Field Calculator to populate the EaseClass field (selected records) with “RFE”
  • Query for AE (NOT SNA or MFE or RFE):
    EaseClass IS NULL 
  • Use the Field Calculator to populate the EaseClass field (selected records) with “RFE”
    There are no AE records
  • Generate Acreage summary for the classes in EaseClass (summarize a categorical field by summing acres) by Right-click on the EaseClass field > Summarize > …

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