Georeferenced raster cartography
IGMI raster cartography is obtained by scanning the analogical cartography or processing raster files (non georeferenced) at the end of the cartography production process. Raster data are acquired at various dpi (Dot Per Inch) resolution. Images are geometrically corrected (georeferencing operation) using GCP (Ground Control Point). Image’s coordinates are associated with those of the corresponding point on the ground in order to calculate the transformation function during the georeferencing process. Raster cartography is georeferenced within the time zone and the different cartographic systems used in Italy. A new projection is carried out in case of an adjacent time zone. All raster maps are available also in cut out versions to help the mosaicking process. Useful information such as data in TIFF format, 8-bit color and a text file (tfw) with the indication of georeferencing parameters are provided.
Raster cartography characteristics are described below
|
MAPS | FORMAT | UTM (ED50) | TM (ETRF2000) | Fuso Italia |
|---|---|---|---|---|
| 25 - 25DB | Full size | 254 DPI | 254 DPI | |
| 25 - 25DB | Cut out | 254 DPI | 254 DPI | |
| 25 DBSN unsupervised generation | Details here | |||
| 25V | Full size | 254 DPI | ||
| 25V | Cut out | 254 DPI | ||
| 50 e 50L | Full size | 400 DPI | 400 DPI | |
| 50 e 50L | Cut out | 400 DPI | 400 DPI | |
| 100V | Full size | 400 DPI | 400 DPI | |
| 100V | Cut out | 400 DPI | 400 DPI | |
| 250/G | Full size | 254 DPI | 254 DPI | 254 DPI |
| 250/G | Cut out | 254 DPI | 254 DPI | 254 DPI |
| 250 | Full size | 508 DPI | 508 DPI | |
| 250 | Cut out | 508 DPI | 508 DPI | |
| 500 | Full size | 254 DPI | 254 DPI | |
| 500 | Cut out | 254 DPI | 254 DPI | |
| 1000 | Full size | 254 DPI | 254 DPI | |
| 1000 | Cut out | 254 DPI | 254 DPI |
and
|
MAPS | FORMAT | Lambert (ETRS 89) |
|---|---|---|
| Carta d'Italia | Full size | 400 DPI |
