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Change Detection Analysis Process Flow

To eliminate the time and expense of visually searching large datasets for changed features, Sanborn has developed advanced analysis and processing techniques for application to imagery and DSM datasets. This flow chart documents our comprehensive approaches to change map creation, polygon integration (e.g. Parcel) and visualization/work flow.

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2D Change Detection
Sanborn 2D Change Detection service applies advanced imagery analysis and processing techniques to analyze spectral, textural, and linear feature changes in different-dated orthoimagery sets. This process “highlights” areas where change has occurred and delivers a raster mosaic “Change Map” that allows users to efficiently locate areas of change.

3D Change Detection
3D Change Detection works by comparison of a new autocorrelated digital surface model (DSM), with an older DSM using surface subtraction techniques. Areas of 3D change are flagged as updated. The 3D change detection process allows for identification of areas of change in the vertical plane such as structures and vegetation.

Change Map
Combined results from the 2D and 3D Change Detection process produce a final change map. This raster-based map is color shaded to show levels of change significance. The example above shows red areas where significant change has occurred and blue areas where no change has occurred.

Parcels Integration
Sanborn can integrate the parcel database information with the change map data. This allows for a parcel-by-parcel change map. Sanborn can also provide a parcel by parcel change map probability-based model based upon the amount of change seen within a specific parcel.

Deliverable Formats
Sanborn can deliver Change Detection Analysis Data in multiple formats:

Parcel Change: This vector format delivery identifies parcels (with percentage of change attribution) that have changed based upon the intersection of the change map and parcel database.

Tabular Parcel Change: Database delivered in tabular form.

Change Map Raster: Raw Change Map data can be delivered in raster format (data not combined with parcel polygons). User can use as a map overlay in common GIS software.

Value-Added Products
Sanborn is an industry leader, providing custom GIS software solutions to address geospatial information needs. Our solutions are built using industry standard development platforms and integrate state-of-the-art data access and analysis applications to integrate database, software, and technology development / implementation with a focus on providing robust, turnkey solutions. These services reflect our rich history in change detection and our experience in migrating geospatial information into mainstream IT business activities.

Sanborn software integration solutions include the ability to view multiple windows of source data side by side. Furthermore, the Software allows the user to organize parcels based upon percent of change, or parcel numbers, and, addresses or other identifier may be used to search for a parcel. Once a parcel is identified, users can select by clicking in the hyperlink and the resulting side by side windows will open showing the same parcel with the two source images side by side. This capability is integrated as an extension to Sanborn’s Oblique Analyst (SOA) software.

Sanborn LogoFor more information or to order Sanborn Change Detection Analysis products or services, call Sanborn customer service at 1.866.SANBORN (1.866.726.2676), or contact us by e-mail at information@sanborn.com.