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)

Lakes TSA Morice TSA Bulkley TSA Vanderhoof Forest District Dawson Ck TSA Mackenzie - North Mackenzie - south Ft St James - north Ft St James - south Robson Valley TSA Inveremere TSA Pr George Forest District Lillooet TSA Merritt TSA Penticton Salmon Arm Vernon



Interpretation of the Maps

  • 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 Protection) did 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 after treatment. 
  • 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

    Many of the archived treatment records did not have enough spatial information to meet the minimum mapping requirement.  Only records that met this standard are depicted on the maps provided.  Reporting of treatments to MoE did not require this level of detail.  The records without the required spatial data is provided in a table.   
    The closest geographic reference is provided but in many cases the locations of the treatment were very general. 

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 for free).
      • Download MSMA_treatment_sites_in_BC.KMZ and remember where it was saved.
      • Re-locate the file and Double-click on the file and it will open up as a "Temporary Place"


        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.
      • Transparency - 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., 50%.