geocoding maps from articles
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![Page 1: Geocoding Maps From Articles](https://reader033.vdocuments.net/reader033/viewer/2022050909/5695d02c1a28ab9b02914fc7/html5/thumbnails/1.jpg)
Topic: Geocoding maps from articles
By M. Neteler, FEM-PGIS: http://gis.cri.fmach.it/
PostGISomics
![Page 2: Geocoding Maps From Articles](https://reader033.vdocuments.net/reader033/viewer/2022050909/5695d02c1a28ab9b02914fc7/html5/thumbnails/2.jpg)
First step: Scanning the map or copying it from a PDF article
Copy map to file (PNG format)
![Page 3: Geocoding Maps From Articles](https://reader033.vdocuments.net/reader033/viewer/2022050909/5695d02c1a28ab9b02914fc7/html5/thumbnails/3.jpg)
Second step: Download and install a free GIS – Quantum QGIS
http://www.qgis.org
- Set LatLong/WGS84 as projection- Load ISTAT map of provinces or other maps
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Third step: Geocoding of unreferenced map 1. Georeferencer tool
2. Load file from PDF
4. Digitize Ground control Points (see next slide)
3. Run geotool in order to digitize points
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Fourth step: Geocoding of unreferenced map II
5. Digitize Ground control Points (GCPs) (see next slide)
6. Set GCP from map
Digitizing rules:- use province corners as reference or other distinct features- well distribute ~10 points over the map
Here the coordinates will appear...
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Fifth step: Create new vector map to store the WNV points
You can of coursealso add morecolumns in order tosave further attributes.
![Page 7: Geocoding Maps From Articles](https://reader033.vdocuments.net/reader033/viewer/2022050909/5695d02c1a28ab9b02914fc7/html5/thumbnails/7.jpg)
Sixth step: Enter name for empty vector map (SHAPE format, .shp)
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Seventh step: Digitize points
Enter ID, save
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Eighth step: Toggle editing to stop/restart editing, save vector map.
Enjoy !! :)
Editing toolbar
Toggle editing on/off
You can of course reload and modify in QGIS.
You may wantto save allas “QGIS project”