Ministry of Environment
Environmental Stewardship Division
Updates
SEI Technical Report We hit some unexpected delays with the production of the SEI Technical Report. This detailed report of the SEI methodology and results will be published shortly.
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SEI Conservation Manual A draft of the SEI Conservation Manual was circulated to some planners, conservation agencies and other interested reviewers over the summer. We have received a number of helpful comments, and will be working with consultants to prepare a new and improved version. If you would like to receive and review the draft Conservation Manual, please contact Judith Cullington at (250) 391-8772. |
Note For Digital SEI Users
Read-only TRIM files now available
The basemap, on which the SEI data is displayed both in hardcopy and digital formats, was developed using selected digital TRIM map layers, namely coastline, streams, contours, railways and roads. Due to the licensing agreement with Geographic Data BC, the SEI project managers are not permitted to redistribute digital TRIM data and many potential SEI users do not have sufficient resources to obtain TRIM for their own use. Users were thus limited to using the SEI data in hardcopy format only.
This obstacle has now been overcome by translating the digital SEI basemap into a read-only image which can be used in any GIS program. The map image is in tif format and is available now from Environment Canada’s ftp site (ftp://www.pyr.ec.gc.ca/pub/dwight/SEI_tif), along with an index map showing the location of the 12 tiles which cover the entire study area. Due to the large size of the tiles (58-116 megabytes), please download and refer to the index map (index.doc) before selecting tiles for downloading.
It should be noted that these are raster images, and although they are spatially correct, the lines appear jagged. They are designed to be used at the scale of the hardcopy maps, 1:20,000. The SEI data must be superimposed on top of the basemap because the image is not transparent and will block out any data underneath it. All of the SEI data can be viewed against the backdrop of the image including the labeled polygons, study area boundary, municipal and regional district boundaries and air photo flight lines and photo centres.
NOTE: For ease of display, an image catalogue is also provided on the ftp site: imgcat.dbf. The catalogue allows the user to zoom in and out and pan the display without being concerned about loading individual tiles, because the relevant tile is automatically displayed. Before using this imgcat.dbf file for the first time, the path identified in the ‘image’ field of the .dbf table must be changed to reflect the user’s directory setup (i.e. to show where the 12 files are stored in the user’s computer). Add the imgcat.dbf as a theme to the display, remembering to change the type of the theme to the ‘image’ option.
These read-only files contain TRIM base map images only - the
SEI polygons do not appear.
For more information, or to obtain SEI digital data, please contact
Peggy Ward.
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