This interactive application creates GIS files to facilitate the standardized survey of (mainly forest) areas. The sampling protocol is based on the protocol created by the Swedish Environmental Protection Agency (Naturvårdsverket, , and more details in ) to survey wood substrates and wood-dwelling species in forest patches of sizes ranging 1 to 30 ha.
The basis of this protocol is to delineate a square-grid over the study area with distances between transects (DT) proportional to the total forest area (A) expressed in m2 .
Linear transects are set along the longest side of the study area (NS or EW), and divided into sampling sub-units, segments.
If the DT is longer than 6 segments (case A) 6 segments (i.e. 3 + 3) around each intersection point are sampled, else, every other segment is sampled (case B).
Circular sample plots are placed at the centre points of every other grid intersection for a more detailed data than in the segments.
In the original protocol segments are set every 10 m, sampling 7 m to each side, and circular plots have 7 m radius. However, note that only the segment center line and circular plot center are shown and downloaded, as only these are needed in the field.
If you want to invest less time in sampling, Survey Designer can optimize the sampling while minimizing the time in field. The method is based on a random sub-sample of the total number of segments according to .
TO USE THIS APPLICATION, DO LIKE THIS:
- Zoom the map to the area you are going to perform your survey in.
- Draw a polygon using any of the shape-buttons on the top-left (free polygon or rectangle)
- Choose the length of the segments (i.e. the sub-unit of each transect) on the control panel to the right. The first intersection point (i.e. initial point) will placed within a random distance DEfrom the edge of the bounding box. DE is a random fraction of DT (i.e.DE = DT / rnd(0,1)). You can reduce this uncertainty by decreasing the maximum the random fraction to 0.
- Set the maximum number of segments you would like to sample out of the complete protocol (“Max. number of segments”), and the time range you estimate each segment can take (“Min. and Max. time spent per segment”).
- Click the “Go” button .
- Don’t you like the outcome? Change the options and click “Go” again. Even if you don’t change the settings, the random distance DE will be redrawn every time you click “Go”.
- Do you like the layout? Click the “Sample” button to randomly sub-sample the number of segments to survey. A new selection will appear every time you click the button.
- You can always start over by clicking on “Clear” .
- Finally, you can download the layers (.SHP file) by clicking “Download” button on the “Download” tab. So long, there are only a few Coordinate Reference Systems to choose from, but more are coming on demand. Files will be compressed in a .TAR file (for compatibility across platforms) in your default Download folder. You can open the file with 7zip.
Author: Alejandro Ruete PhD, 2017
Greensway AB. Uppsala, Sweden.
 Anon. 1999. Fältinstruktion för undersökningstyperna: Allmäninventering, Substratinventering, Indikatorartinventering och Bestånd- och ståndortsinventering inom delprogrammet Extensiv övervakning av skogsbiotopers innehåll med inriktning mot biologisk mångfald. Naturvårdsverket. Stockholm, Sweden. 57pp. Link (as of 11/2017)
 Jönsson, M.T., Ruete, A., Kellner, O., Gunnarsson, U., Snäll, T., 2017. Will forest conservation areas protect functionally important diversity of fungi and lichens over time? Biodivers Conserv 26, 2547–2567. doi:10.1007/s10531-015-1035-0
 Ruete, A., Widenfalk, O., Widenfalk, L.A., in prep. How many more? Linear transect sampling efficiency for characterization of boreal forest stands.