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EESD19 Professional Development Seminars in Geoscience

Raster data

Review

Raster data stores information in a matrix of cells. Examples of raster data are air photos and satellite images. Unlike vector data, raster data doesn't store the coordinates or other descriptive information about the data in a database. Information about the scale, coordinate system and projection are normally accessible through the metadata. 

What to look out for when looking at a metadata record of a raster dataset:

- method of access

- type of data

- scale

- datum

- projection

- who can use the data

- formats

There are various terms for air photos: orthophotos, aerial photos, air photos.  Keep this in mind when searching for air photos and use Boolean operators (AND/ OR) when you search.  For instance:

("Air photo" OR orthophoto" OR "aerial photo") AND Toronto

You can also browse our collection of air photos:

For a complete list of our air photo holdings, consult this webpage. 

Satellite images for Canada can be accessed through Geobase. This data is accessible for anyone. Through the Inventory, students and staff at the University of Toronto also have access to Landsat data, which are also satellite images.