REMOTE SENSING BASED FOREST INVENTORY. Blom Kartta Ltd Aki Suvanto
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1 REMOTE SENSING BASED FOREST INVENTORY Blom Kartta Ltd Aki Suvanto
2 BLOM Leading company in remote sensing business in Europe Offices in 11 countries Revenue about 100 M (2008) Main products Aerial photography Laser scanning Mapping & Modelling Databases Navigation & Location Services Forestry related production in Finland, Norway and Spain
3 Blom Kartta Ltd. Is one part of Blom group About 30 employees Offices in Helsinki and Joensuu Main products: Aerial photography Laser scanning Cartography Forest inventory Long tradition in forestry sector First infrared images 1977 First colour infrared images 1977 First digital orthophotos in forestry purposes 1995 First laser scanning experiments 1997 First digital aerial photographs 2005 First experiments in forest interpretation started in 2006 Remote sensing based inventory system as commercial activity since 2007
4 Inventory process Planning Laser scanning Aerial photography Measuring field reference data Modelling Segmentation Interpretation Create datasets to customer s data system
5 By-products of inventory process Orthorectified aerial images If images are captured Updating the stand borders We are not digitizing those borders by hands but these are updated using automatic segmentation which produce microstands Forester can use microstands to update old stand borders Accurate terrain and canopy height model It is possible to find new products and applications Analysing soil Use these two raster datasets to modify stand borders
6 Remote sensing based forest inventory + Estimation of forest characteristics is highly accurate and objective + It is cost-effective method in large areas + No sampling, it covers the whole inventory area + Processing is highly automatic + It is possible to estimate and calculate results for large forest areas very efficiently - We can not predict all variables - Fertility classes or define forest management proposals - Nature conservation issues - Rare flora, fauna or habitats - Expensive method in small areas
7 Risks which relates to this method 1. Bad weather conditions in aerial photographs and laser scanning 2. Restrictions from air traffic control 3. Short time period to capture aerial data 4. Errors in field plots locations or errors in field plot measurements 5. Quality of laser scanning data and aerial photographs 6. How the field plots represent the actual inventory area 7. To perform this inventory process by several data providers
8 Example data
9 Field plots in example inventory area
10 Measuring field reference data
11 Reference plots in inventory area
12 Modelling and calculation
13 Modelling and calculation
14 Different modelling methods Single tree detection It requires more expensive laser scanning data because of higher density, at least 3-5 pulse/m 2 This method has not tested in operative inventory process Regression based methods We can not predict tree species specific results accurately Still, it works quite well in total forest characteristics Non-parametric methods We can estimate several dependent variables Tree species and total forest characteristics It requires lots of field reference data Minimum is 500 field plots k-nn, k-msn
15 Modelling and calculation Dependent variables of forest characteristics Basal area weighted mean diameter Basal area weighted mean height Number of stems Basal area Volume Dominant height Also we can estimate forest characteristics in saplings In Finland development class T2 Predicting diameter distributions Theoretical wood assortments Log and pulp wood There is a chance to find new variables to describe forest
16 Calculation units The basic calculation unit is grid-cell Size could be eg. 16x16 meters The general principle is that the size of grid-cell is equal to size of field reference plots For every grid-cell we calculate all desired forest characteristics Stand level results are generalized from the grid-cells which are inside the single stand Grid-cells could be utilized directly in data system
17 Stand level generalization
18 Stand level results
19 Microstands It is a new generation product Microstands splits the forest inventory area as homogenous units as possible In forested area, the size of microsegments is approximately 250 m 2 1 hectare Segmentation of microstands is an automatic procedure No humans visual interpretation It could be restricted inside the certain area Forest property or some other area It is based on laser scanning data
20 Microstands
21 Microstands
22 Example of utilizing microstands. Theme of total basal area.
23 Data transfer
24 Conclusions Remote sensing based forest inventory will increase its popularity in forestry This method is very powerful tool in right hands It requires very accurate planning Powerful and good implementation Quality control for every processing stage The quality and accuracy of forest resources should become better It provides new products and applications Eg. microstands, accurate terrain and canopy height model Forester is still needed It is not possible to automatize all working routines Forest management proposals and counseling for forest owners Checking of deciduous species in forest.
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