Geo Referencing & Feature Extraction...

Geo Referencing and Feature Extraction
Geo Referencing and Feature Extraction

Geo Referencing & Feature Extraction

Geo referencing is the process of assigning geographic coordinates to a raster image in order to define its location in the world based on a map coordinate system. These raster images are, more often than not, scanned maps, plans or drawings. Without completing the georeferencing process it is impossible to extract the maximum value from the scanned images within a Geographic Information System (GIS). Given that the most important application of the images is to understand how the historic geographic information compares to, and interacts with, the current spatial context, not being GIS-ready is a major limitation.

Feature extraction is the process of extracting 2D features and converting them to 3D vectors for use in a GIS. Examples could include land parcel boundaries that have been hand-coloured on a paper map. We would extract the boundaries as shapes and then attribute the shape with information based on, for example, what the colour infill denotes (e.g. arable). We can extract multiple parcels from a single map and assign different attributes to each parcel type. These individual parcels are then output as a single file (for example .shp or tab) that can be overlaid on current mapping or aerial imagery.

Max are able to provide an end-to-end solution that includes scanning the maps and drawings as high-res tiffs, converting these image files to geo-referenced versions (geo-Tiff), extracting relevant features as geometry and then delivering these files through a web GIS (if required).

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I have worked with Max Communications and the team for some years. In recent work with their Archivematica iteration in the College Archives and Corporate Records Unit, and other digital work required by varying cohorts in Imperial, Max Communications have been responsive, innovative and demonstrated great problem-solving abilities. The Max Communications team, from the top down, is approachable, friendly and keen to help.

An example is in their engagement for some major confidential scanning projects. The projects were discussed, scoped and agreed to a high standard of hand scanning. Benchmarking was agreed to our satisfaction when the project started, with a fast progress time for the work. They provided rapid access to files, including digitising out of sequence, e.g. one such turn around for hand scanning, editing and proofing a large file was within 3 hours. The digital delivery was by secure online transfer, and the hard disks and hard copy delivered securely by courier.

On a lighter note, digitisation of 1960s academic cine film was carried out promptly and to a high standard, such that it can be reshown at a major conference

--Anne Barrett | College Archivist & Corporate Records Manager | Imperial College London
Geo Referencing and Feature Extraction
Geo Referencing and Feature Extraction