Hero Map Process Flow

Aerial Photos from MassGIS

Town Boundary

Pre-processing

Town Impervious

MassGIS Impervious

Clip the Individual aerial photos by town Boundary using “clip data management” in ArcGIS

Create a Mosaic in Erdas using the clipped images

Spatial adjustment or not

Add a Text field and populate it with Feature Id

Feature to Poly

Town Boundary Thematic

IDENTITY

Decide whether to use town impervious and/or MassGIS impervious

Impervious thematic

Check for missing/ extraneous impervious

Water

Wetlands

Create a fishnet in ArcGIS using the mosaic as Extent

Water Thematic

Manually edit water thematc

Clip wetlands by water

Split the Fishnet polygons on the basis of the text field created previously

Wetlands Thematic

Manually edit wetlands thematic

Split

Analysis

Validation

Post-Processing

Definiens

Town Boundary Split

Impervious split

Water Split

Add image layers and thematic shapefiles

Make a Definiens Project

Export definiens Landcover classes as raster

Post processing model in ArcGIS for individual Grids

Validation Model

Soft classified residential lawns

% of each Landcover class for parcels, census blocks

Dissolve image objects by class

Manual Edits

MERGE the grids to make a single land-cover shapefile

Eliminate border slivers

Analysis Model

Suitable

Aerial photo Mosaic split

Load or build classification hierarchy

Run Segmentation at scale 40 for 0.5 m images

Sampling

Classification Manual Edits

Find the largest unclassified polygons

Edgematching

Export to a File Geodatabase

Determine proportions of strata by validation calculations

Wetland Split

Resample

Manually assign classes to selected polygons

Check for appropriate accuracy

Suitable

Unsuitable

NDVI Model

Average NDVI of Lawns for Parcels, census blocks