Photo Interpretation Services

The Vendor is required to provide requires imagery interpretation and digital data capture services for land cover mapping in agency photo plots.
- A survey consisting of 2km x 2km “photo-plots” located throughout state at regularly spaced grid. Was established starting in the year 2000.
- Two main sources of data were used: (a) medium scale (1:10 000 to 1:25 000) stereo aerial photointerpretation, and (b) classified land cover maps derived from Landsat
- Provide contractors with a previously completed land cover line work (i.e. shapefiles) of the photo plot and associated attributes. In less than 8% of the photo plots, the agency installs a ground plot; these data will be made available as well and can help inform interpretation.
- Consequently, all interpreters are expected to be highly competent and have significant experience in forest inventory photo interpretation in the geographic zone they are working in.
- Obtain shapefiles of initial photo plot interpretation and attributes where available.
- Obtain supporting information from the province, territory or available online resources where the plots are located, e.g., past treatment, history, existing mapping and inventory data, freely available imagery etc., which could be used to assist in interpretation.
- As the data structure and constraints are slightly different between measurement cycles, minor differences exist between the documentation and tools used for first remeasurement and second remeasurement data.
- Photo plots straddling provincial or territorial boundaries must be fully delineated without regard to the location of the jurisdiction boundary. The shapefile and attribute files must be duplicated and saved in the appropriate jurisdiction data packages.
- Polygon delineation must conform to the land cover interpreted from the supplied imagery.