Maps and Other Information Describing the Known Locations of Trees Treated with Monosodium Methanearsenate (MSMA)
for Bark Beetle Control
Provincial Overview Map
Click on the blue
highlighted area of interest to view a District/TSA
scale map (Each map will open in a new
window and are ~2 MB in size)
DISCLAIMER (pdf, posted
Sept 10, 2009)
Pesticide Use Permits for the application of
MSMA issued by the Ministry of Environment
(formerly the Ministry of Water, Air and Land
not require submission of maps showing the
specific locations of treatment sites and as
such, MFR records, if available, had maps with
varying levels of spatial accuracy.
Only treatment unit data that
provided sufficient geographical references
could be mapped and displayed.
Each treatment unit was buffered
with a 200 m polygon to ensure that it
accurately portrayed the expected location of
the treated trees. GPS technology,
particularly in forested sites, has a positional
accuracy of about +/- 100 m, so the buffer takes
this accuracy into account. Where more
accurate data was provided, the treatment unit
will be located in the centre of the polygon.
Older records were not GPS'ed as the technology
was not yet available. Some of the
earliest treatments occurred in the early 1980's
and were for spruce beetle. It is likely
these trees have decomposed as they were felled
Each treatment polygon represents
sites where about 10 to 100 trees were treated.
The centre of the polygon is located at the
approximate centre of the
treatment site as the exact location of each
treated tree was not recorded.
Known treatment sites
without spatial data
Do you have Google Earth?
- The spatial data is provided in a Google Earth
KMZ file. This viewing option is probably
the easiest means for the average user to search
and view this data.
- Loading and viewing instructions:
- You must have Google Earth installed on
your computer. (Download
and remember where it was saved.
- Re-locate the file and Double-click on
the file and it will open up as a "Temporary
Open Google Earth, click on 'ADD" on the
toolbar, and then click on "Network Link",
choose the folder using the Browse button
and select the location where the MSMA file
was saved, click 'OK'. This will save
it as a "Network Link" in the Places status
bar where it will be located every time you
open Google Earth.
- Using the data:
- See Google Earth screen shot
- The shaded polygon depicts the known
location of a certain number of MSMA treated
trees described in the record that are known to
occur within a specific area plus a 200 m buffer
added to accommodate spatial errors.
- The pop-up box contains the data for the
record including the record number, opening
number, district and region, 1:20,000 mapsheet
number, area of the polygon
(including the buffer), number of treated trees,
latitude and longitude of the center of the
site, and the current status of the site (either
standing or harvested).
- Known Issues:
- Viewing the whole
polygon - only the portion of the polygon
that occurs on the bottom half of the viewing
screen is initially visible. Scroll the
map to the top to reveal the whole polygon.
- the default is to view the polygon with a
solid fill which makes it difficult to see the
forest condition under the polygon. It is
recommended to change the opacity by selecting
under "My Places" or "Temporary Places" the
folder containing the MSMA file. Next,
click on 'EDIT' on the tool bar, then select
'PROPERTIES', then select 'Style,Color', and
modify the Opacity to the desired amount, i.e.,