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TRIM Program

Terrain Resource Information Management


The original TRIM program, consisting of 7027 digital files, was completed in December 1996. For several reasons, it was necessary for the data to be updated. The map compilation photography was as much as 15 years out of date. The Forest Practices Code put greater demand on increased information content for features such as roads, stream, forest openings and such. This lead to the development of the TRIM II program.

The TRIM program consists of updating the 1:20 000 TRIM data to new specifications, producing an orthophoto for each 1:20 000 map sheet , limited 1:10 000 and 1:5 000 mapping. The mapping is done from 1:40 000 scale, black and white photography. There is also an aerial triangulation specification.


For a complete list of TRIM products, see our collection of Map Data products.

TRIM Specifications

TRIM specifications are used by mapping contractors and partners to provide digital map data for the province of British Columbia. Specifications include documents on base mapping, scanning aerial photos, gridded DEM and the SAIF standard. Read more

TRIM Data Exchange

The currency of Branch information is as important an element as data content, accuracy or consistency. In some cases, data currency is the most critical requirement. The Trim Data Exchange Program will provide users with current and accurate data by the most efficient, economical and effective means possible. Read more

Qualified TRIM Contractors List

Click here for a list of qualified companies for orthos, mapping, AT and stereo models. (PDF, 58 KB)

User Manual for TRIM HoL Database

This manual describes how to use the British Columbia TRIM Height-of-Land (HoL) database. It provides an introduction of the HoL database concepts as well as a procedural guide to using the data to support the business needs of Primary Users, who include GIS Analysts and Technicians who work in the Ministries of: Forests; Parks; and Crown Lands. Contractors who work under contract for these Ministries to process the database can also be Primary Users.

Download the User Manual for TRIM HoL Database (PDF, 600 KB).