Impervious Area GIS Mapping Using Existing Aerial Imagery

Background
The City of Danville, Illinois, is seeking information from qualified firms for the development of an impervious area polygon map using existing high-resolution aerial imagery. The goal is to create a parcel-based, GIS-ready dataset that supports stormwater management planning. Additionally, the City is interested in developing a public sidewalk polygon layer for sidewalk infrastructure asset management planning as a secondary priority. This Request for Information (RFI) aims to gather insights that will help refine the scope, budget expectations, technical requirements, and procurement strategy for a potential future project.

Work Details
The project involves creating an ESRI ArcGIS-compatible dataset that includes impervious area polygons aggregated or clipped by parcel boundaries and public sidewalk area polygons. Vendors are expected to provide detailed methodologies for extracting and mapping impervious surfaces, including:
- Explanation of the solution methodology (manual digitization, automated image classification, machine learning/AI, or hybrid methods).
- Details on accuracy and reliability metrics (horizontal accuracy, classification accuracy, confidence levels).
- Quality Assurance/Quality Control (QA/QC) procedures for validating outputs and correcting errors.
- Processes for troubleshooting erroneous data and identifying misclassified areas.
- Description of how polygons will be delineated based on parcel boundaries from City-provided GIS layers.

Additionally, vendors should outline the anticipated project scope including data requirements from the City, preprocessing steps, classification workflows, final data structure and formats, as well as metadata documentation. Budgetary-level cost estimates and anticipated schedules with key milestones are also required.

Period of Performance
The estimated duration from notice to proceed to completion has not been specified but should include key milestones such as data intake and final delivery.

Place of Performance
The work will be performed in Danville, Illinois.

Bidder Requirements
There are no specific set-aside certifications or registrations mentioned in this RFI. Vendors are encouraged to provide thorough responses to the requested information.