The job is described in the report:
“Methodics for monitoring of protection zones by lakes and streams”
which can be ordered at SNV (a pdf of about 2 Mb can also be found on the Forestry Commission or of SNV.
|Summary (from the report)
This project includes a methodology for inventory of protection zones in the forest landscape of the lakes and rivers and is part of the LIFE project “Demonstration of methods of monitoring sustainable forestry”. The pilot study has been made in the embankment demonstration area in Uppsala and has covered Lake Vallen and four streams in the area. The purpose of the study was that, with the help of remote sensing (aerial) develop a rational and effective method of inventory of forest buffer zones to lakes and rivers. After the design and development of the methodology has a total of a 70 kilometer long shoreline inventoried, of which 48 km is made up of forest land in the Valle area.
The beach area was inventoried from a zone width on the land side of 50 m from the shoreline. It was recorded if there were any buffer zones, ie forest with an average height of 12 m or more, or if such zones were missing. If there were zones of forest and forest-bearing waste land, the zone width was recorded in eight different classes. The lack of protection zone or the existence of different zonbreddsklasser was listed by recording the shoreline length. In the areas that lacked protection zone was divided timber in three cutting classes. When it comes to areas with protection zone was registered as demarcated zone, for example, other types of land or cutting class (regarding forest with an average height over 12 m).
The classification and measurement was performed by stereo aerial mounted W (average height images) in an analytical stereo plotter (Topokart instrument supported by two computers).
Protection zone classes created in ArcInfo. The results of processing gathered in a digital map database. From this can utplottning of maps made. Statistics are presented in ArcInfo and transferred to a specified table format. This method means that the time required for clean production is approximately 22 minutes per km of shoreline length. (If the development and processing time in ArcInfo included, was the time required approximately 54 min / km).
The results of the inventory of the 70-km-long coastline was divided between 48.3 km forest 2 km forest-bearing waste land and 20 km other types of land. Lack of buffer zone against water was recorded at Woodland 4.2 kilometers shoreline length or less than 10% of the total forest land shoreline. If these 4.2 km instead related to the felled areas shoreline length, represents the area that lacks protective zone somewhat less than 25%. When logging absorption during the most recent period (bare and flat forest below 1.3 m height) is about 15% left without protection zone against water. The previous period (seedling and young stands with 1.3 to 9 m height) was provided about 16% without the protection zone and the preceding period (young forest with 9-12 m height) submitted 34% of the shoreline without protection zone. Large variations in different areas occurred. The inventory of the preserved protection zones shows that zonbreddsklasserna between 15 and 30 m dominates. Some zones were strongly affected by logging. Total accounted for this effect just over 1% of the shoreline length. The results of the inventory can be established that an improvement of the preserved beach zones 10 had occurred over time, but that further improvements are achievable (ie, a larger proportion buffer zones can be saved at harvest).
The development work has been done in cooperation with NaturGis AB, which also made the stereo processing and statistical compilation.