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Frontiers of Earth Science

ISSN 2095-0195

ISSN 2095-0209(Online)

CN 11-5982/P

Postal Subscription Code 80-963

2018 Impact Factor: 1.205

Front Earth Sci Chin    2010, Vol. 4 Issue (4) : 457-462    https://doi.org/10.1007/s11707-010-0128-z
RESEARCH ARTICLE
Quantitative descriptors for identifying plant species of urban landscape vegetation
Jianhua ZHOU1(), Yifan ZHOU2
1. GIScience Key Lab., Chinese Ministry of Education, East China Normal University, Shanghai 200062, China; 2. School of Earth Sciences, Stanford University, CA 94305-2220, USA
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Abstract

This paper discusses the ideas and methods of designing effective descriptors for identifying plant species of urban landscape vegetation. Fourteen of such descriptors induced from image spectrum, texture, and shape properties were designed. These descriptors were intended to meet such requirements as possessing a true physical or geometric implication relating to ecological significance, having a relatively steady segmentation threshold and being less sensitive to image types or environmental conditions during image acquisition. This study used decision trees to combine four selected descriptors for plant species identification, and the experiment was able to reach an error rate of 5.8% compared 25.9% by merely using the conventional pixel brightness values in plant species identification.

Keywords urban landscape vegetation      plant species      machine discerning      descriptor     
Corresponding Author(s): ZHOU Jianhua,Email:jhzhou@geo.ecnu.edu.cn   
Issue Date: 05 December 2010
 Cite this article:   
Jianhua ZHOU,Yifan ZHOU. Quantitative descriptors for identifying plant species of urban landscape vegetation[J]. Front Earth Sci Chin, 2010, 4(4): 457-462.
 URL:  
https://academic.hep.com.cn/fesci/EN/10.1007/s11707-010-0128-z
https://academic.hep.com.cn/fesci/EN/Y2010/V4/I4/457
SignNameMeaninga)Validityb)
Spectrum descriptors
ARRelatively red brightnessAR = (R-Ravg)/Ravg (R: red brightness; Ravg: mean R; G, Gavg and B, Bavg by analogy)
AGRelatively green brightnessAG = (G-Gavg)/Gavg★★
ABRelatively blue brightnessAB = (B-Bavg)/Bavg★★
B_NDVIRelative NDVIB_NDVI= (B/IR-NDVI) / NDVI★★★
NDUINormalized difference umbra indexNDUI= (S-I)/ (S+ I) (S: mean saturation; I: mean brightness)★★
DSIRelative difference between S and IDSI = (S-I) / S★★★
CdRelative density of supplemental vegetation pixelsCd = Dsi/ Ai (Dsi: supplemental vegetation pixels in cell i; Ai: vegetation pixels in cell i)★★★
Texture descriptors
TRelative edge pixelsT= Sedge/ANDVI (Sedge: edge pixels; ANDVI: the pixels tallying with NDVI>0.18)★★★
QFRelative undulationQF= Aholes/ANDVI (Aholes: small hole pixels on tree crowns)★★
LdDensity of bright detailsLd = Slight /ANDVI (Slight: pixels of bright details)★★
DdDensity of dark detailsLd = Sdark /ANDVI (Sdark: pixels of dark details)★★★
Shape descriptors
SKDensity of skeletonSK = LS/D (LS: length of plotc) skeleton; D: diameter of plot)★★★
CVUndulating extention of edgeCV = Acon/A (Acon: pixels of crown convex, A: pixels of crown plot)★★
RaWeighted mean crown diameterRa: the mean minor axis of plot outlines when each minor axis has its plot area as a weight.★★★
Tab.1  New descriptors of identifying plant species with remotely sensed images
Fig.1  Comparison of the capabilities of segmenting three plant species by , , , and
Fig.2  An instance of clustering with a combination of four descriptors. (a) Distribution of ; (b) grade chart of ; (c) output of clustering
Fig.3  An instance of extracting supplemental vegetation pixels in the low red saturation. (a) Original image; (b) = >0.18; (c) ∪; (d)
Fig.4  Comparison of identification accuracy with two different property combinations.(a)Original image; (b)combination of , , and ; (c) combination of spectrographic brightness. Z—camphor; S—metasequoia; G—magnolia; X—cedar; N— privet; 0—cell having<10% vegetation cover
Input vectorWith the combination of NDVI, Dd, Ra, and CdWith the combination of spectrographic brightness
Number of incorrectly identified cells836
Error rate5.8%25.9%
Tab.2  Comparison of identification accuracy
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