Abstract
The work related to this paper is part of an on-going
study called NewForest - Renewal of Forest Resource
Mapping. In this study the methodologies developed for
individual tree crown (ITC) recognition and crown width
estimation will be combined with forest variable
estimates that are produced using features calculated
from segmented VHR satellite image. A field visit to
Karttula, Eastern Finland, was conducted to collect the
class and geo-location information for 1164 ground
objects (900 trees and 264 non-tree objects). These data
were used for the classifier model and feature selection
and for species classification accuracy assessment. For
testing the classifier ability to predict tree species
proportions, an independent set of 178 forest field
inventory plots was used. Seven classes were defined:
pine, spruce, deciduous, shadow, open area, bare ground,
green vegetation. A modified Local maximum (LM) filtering
technique was used for individual tree crown (ITC)
detection. The
spectral signatures of an ITC were sampled with a radius
of r=1.5 m around the ITC brightest pixel (feature set
A). Also a set of 9 contextual features were extracted
from circular neighbourhood (r=7.25 m) around the ITC
(feature set B). A classifier model and feature selection
was performed. A 5NN classifier provided the best overall
performance in tree species classification in terms of
classification accuracy and generalization. The overall
classification accuracy for the seven classes was 73.8%
with feature set A using 5NN classifier. With feature
sets A and B combined the accuracy was 74.1%. The average
RMS errors in species proportion prediction were 2.6%
with feature set A and 2.5% with feature sets A and B
combined.
Original language | English |
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Title of host publication | Proceedings of the ESA Living Planet Symposium, Bergen, Norway (ESA SP-686, December 2010) |
Place of Publication | Noordwijk, The Netherlands |
Publisher | European Space Agency (ESA) |
ISBN (Print) | 978-92-9221-250-6 |
Publication status | Published - 2010 |
MoE publication type | Not Eligible |
Event | ESA Living Planet Symposium 2010 - Bergen, Norway Duration: 28 Jun 2010 → 2 Jul 2010 |
Conference
Conference | ESA Living Planet Symposium 2010 |
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Country/Territory | Norway |
City | Bergen |
Period | 28/06/10 → 2/07/10 |
Keywords
- forestry
- tree species classification