QGIS 316 Part 2 Georeferencing a Scanned Map Without Printed Coordinates

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Georeferencing maps using QGIS • • Many times we want to work with maps within a GIS that do not have any spatial reference associated with it but do contain a grid that we can leverage to add the missing georeferenced information, the process is similar to using control points for images based on pattern matching or looking similar locations on a referenced map to correct the one we want to use however in this video I concentrate on maps that contain some sort of grid or tick marks • • Timestamps • 00:00 Intro • 00:12 Getting some maps • 00:35 Checking if file has georeferencing • 01:29 Adjusting PDF DPI for rendering as Raster in map Canvas • 02:31 Opening Georeferencer and loading the file • 03:12 Adding Ground Control Points (GCP) • 05:54 QGIS Georeferencing Documentation • 06:35 Georeferencing using Linear Transformation • 07:02 Checking georeferenced map with other data • 08:55 Georeferencing using Polynomial 2 Transformation • 10:40 Final Thoughts • • • • Website blog: https://www.antoniolocandro.com • twitter: / antoniolocandro • • #qgis #gis #antoniolocandro #georeference

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