The video of the fourteenth module is now available, in which we will show how to georeference an image.
Sometimes the technicians of a city council have images that are not georeferenced. They also can have an old map on paper, the data of which are needed to perform some analysis on their desktop application, such as delimiting the municipality in detail for example. That map on paper could be scanned so that they would have an image on their hard disk.
These images don’t have coordinates, so if they insert them in a View they would be in the coordinates ‘0,0’, and they would not be overlapped with the georeferenced cartography.
To georeference that image they will need cartography that is georeferenced, so that they can indicate the control points in that cartography, and their corresponding ones in the image to be georeferenced. It could also be done if they have a table with the coordinates of the different control points.
The cartography to follow this video can be downloaded from this link.
Here you have the videotutorial of this new module:
- Module 1: Differences between GIS and CAD
- Module 2: Introduction to reference systems
- Module 3: Views, layers, symbology, labelling
- Module 4.1: Attribute tables (alphanumeric information)
- Module 4.2: Attribute tables (joining tables)
- Module 5.1: Web services (Introduction to SDI)
- Module 5.2: Web services (Loading web services from gvSIG)
- Module 5.3: Web services (Non-standard services)
- Module 6: Add-ons manager
- Module 7.1: Editing (new layers, graphical and alphanumeric editing)
- Module 7.2: Editing (Derivative geometries)
- Module 8.1: Creation of point layers from tables (Geocoding: Points from a table with addresses)
- Module 8.2: Creation of point layers from tables (Event layers)
- Module 9: Hyperlink
- Module 10: How to convert cartography from CAD to GIS
- Module 11: Reprojecting vector layers
- Module 12: Geoprocessing
- Module 13: Layouts