AERIAL PHOTOGRAPHY

Our project teams have a core philosophy of attempting to extract the maximum amount of historical or present day information from aerial photographs. Enormous of information can be cost-effectively mined from aerials. It is a matter of routine at Project Navigator, that one of the first tasks on a new project is to obtain the historical aerials. We then use aerials as follows:

• To evaluate past historical practices at a project site, including such topics as waste disposal.
• To identify and locate site features which are buried today.
• As a template for GIS work. Today's site analytical data can be displayed using backdrops of historical aerials. A site's characterization data can also be displayed in a 3D format, hanging the data from digitized site aerials.
• To assist in site waste volume calculations and thereby remedy cost projections.

Case Studies:

• Site aerials were used to guide the judicious siting of geoprobe sample locations at a major Superfund site in Los Angeles. The goal of the technical program was to define the lateral extent of the oily wastes for capping purposes. Rather than deploy the geoprobes in a grid pattern, over large areas of the site, Project Navigator studied historical aerials, which were digitized and added to the site's GIS database. Geoprobes were only inserted along the edge of the waste as visually identified from the aerials. The interaction between real-time field data collection and our in-office analysis via GIS proved to be invaluable in reducing site assessment costs.

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