Chlorophyll content mapping of urban vegetation in the city of Valencia based on the hyperspectral NAOC index

Delegido, Jesús; Wittenberghe, Shari Van; Verrelst, Jochem; Ortiz, Violeta; Veroustraete, Frank; Valcke, Roland; Samson, Roeland; Rivera, Juan Pablo; Tenjo, Carolina; Moreno, José

doi:10.1016/j.ecolind.2014.01.002

Cited by 33 publications

(35 citation statements)

References 43 publications

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“…Moreover, in highly polluted areas, excessive deposition of particles onto leaf surfaces could effectively block light that would otherwise be available for photosynthesis (Delegido et al . ). Since concentrations of urban air pollutants, especially vehicular‐traffic‐derived PM, decrease with increasing height (Hofman et al .…”

Section: Tree Traits – a Moving Targetmentioning

confidence: 97%

Functional traits of urban trees: air pollution mitigation potential

Grote

Samson

Alonso

et al. 2016

Frontiers in Ecol & Environ

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312

145

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In an increasingly urbanized world, air pollution mitigation is considered one of most important issues in city planning. Urban trees help to improve air quality by facilitating widespread deposition of various gases and particles through the provision of large surface areas as well as through their influence on microclimate and air turbulence. However, many of these trees produce wind‐dispersed pollen (a known allergen) and emit a range of gaseous substances that take part in photochemical reactions – all of which can negatively affect air quality. The degree to which these air‐quality impacts are manifested depends on species‐specific tree properties: that is, their “traits”. We summarize and discuss the current knowledge on how such traits affect urban air pollution. We also present aggregated traits of some of the most common tree species in Europe, which can be used as a decision‐support tool for city planning and for improving urban air‐quality models.

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Section: Tree Traits – a Moving Targetmentioning

confidence: 97%

Functional traits of urban trees: air pollution mitigation potential

Grote

Samson

Alonso

et al. 2016

Frontiers in Ecol & Environ

Self Cite

312

145

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“…This problem can be addressed using specific calibration curves, which includes linear, exponential, or polynomial calibration functions. In this work, a calibrated SPAD-502 using a power relationship to obtain leaf Chl content physical values in µg · cm −2 was used [36]. Hence, in order to characterize the chlorophyll content of the ESUs, 10-15 readings were made covering each ESU.…”

Section: Phenologymentioning

confidence: 99%

“…Chlorophyll concentration may change throughout different stages of plant phenology and is affected when crop plants are under stress conditions, mainly due to changes in soil nitrogen content [35]. Thus, leaf chlorophyll content becomes a key issue for agronomists and farmers to make management decisions at critical stages and has been widely studied by the remote sensing community [36][37][38]. Direct field measurements of chlorophyll content over large areas require a big effort in collecting destructive samples and conducting laboratory chemistry methods.…”

Section: Introductionmentioning

confidence: 99%

“…Direct field measurements of chlorophyll content over large areas require a big effort in collecting destructive samples and conducting laboratory chemistry methods. Conversely, the use of handheld devices, such as SPAD-502 (Minolta Osaka Company, Ltd., Japan), are being used for rapid non-destructive sampling of leaf chlorophyll content [36,39]. For these purposes, continuous seasonal field phenology and leaf chlorophyll content were measured to complement seasonal rice plant information provided by PAI acquisitions.…”

Section: Introductionmentioning

confidence: 99%

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Multitemporal Monitoring of Plant Area Index in the Valencia Rice District with PocketLAI

et al. 2016

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Leaf area index (LAI) is a key biophysical parameter used to determine foliage cover and crop growth in environmental studies in order to assess crop yield. Frequently, plant canopy analyzers (LAI-2000) and digital cameras for hemispherical photography (DHP) are used for indirect effective plant area index (PAI e f f ) estimates. Nevertheless, these instruments are expensive and have the disadvantages of low portability and maintenance. Recently, a smartphone app called PocketLAI was presented and tested for acquiring PAI e f f measurements. It was used during an entire rice season for indirect PAI e f f estimations and for deriving reference high-resolution PAI e f f maps. Ground PAI e f f values acquired with PocketLAI, LAI-2000, and DHP were well correlated (R 2 = 0.95, RMSE = 0.21 m 2 /m 2 for Licor-2000, and R 2 = 0.94, RMSE = 0.6 m 2 /m 2 for DHP). Complementary data such as phenology and leaf chlorophyll content were acquired to complement seasonal rice plant information provided by PAI e f f . High-resolution PAI e f f maps, which can be used for the validation of remote sensing products, have been derived using a global transfer function (TF) made of several measuring dates and their associated satellite radiances.

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“…Sensitivity analysis using PROSPECT and 4-Scale models simulated VIs was perfonned in order to assess the impacts of different background types and LAI on VIs' perfonnance [12]. NAOC (Normalized Area Over reflectance Curve) index calculated from CASI (Compact Airborne Spectrographic Imager) data linked with the laboratory chlorophyll content and SPAD-502 chlorophyll content of trees, chlorophyll content map was made with a RMSE of 15 g/cm 2 [13] .…”

Section: Introductionmentioning

confidence: 99%

Vegetation chlorophyll content estimation based on model simulation and OLI image

Yuan

Sha

et al. 2014

2014 Third International Workshop on Earth Observation and Remote Sensing Applications (EORSA)

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Leaf optical model PROSPECT and canopy reflectance model SAIL are used to simulate vegetation canopy reflectance. The relationships between vegetation chlorophyll content and vegetation indices, view zenith angle and LAI are analyzed, in order to provide scientific basis for the estimation of chlorophyll content. We make field measurement of winter wheat in Luancheng County in Hebei Province, China, and the location, altitude, LAI, height, mean leaf angle of winter wheat at sampling points are obtained. In model simulation, LAI 4 is used, and view zenith angles 0° , 36° and 55° are selected according to five imaging angles of CHRIS (Compact High Resolution Imaging Spectrometer) sensor on board PROBE satellite. Other view zenith angles include 40°, 60° and 90°. Many vegetation indices are selected to make this study. Results show that when LAI is 4, MCARI705 and Clred ed g e are the most effective indices to estimate chlorophyll content. Under different view zenith angles, MCARI705 and Clred ed g e are related linearly to chlorophyll content, and the correlation coefficients are all close to 1. The correlation coefficients of chlorophyll content with GRVI and MCARI670 are greater than 0.91. At a certain view zenith angle, with the increase of chlorophyll content, RVI, PRI, GRVI, Clred ed g e and MCARI705 tend to increase, while EVI and MCARI670tend to decrease. DVI values are close to saturation when chlorophyll content is greater than 40llg/cm2. When view zenith angles are less than 90°, the influence of view zenith angle on PRI is very small. Using GRVI and RVI calculated from Landsat-8 OLI image, chlorophyll content mapping of winter wheat is made.

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Chlorophyll content mapping of urban vegetation in the city of Valencia based on the hyperspectral NAOC index

Cited by 33 publications

References 43 publications

Functional traits of urban trees: air pollution mitigation potential

Functional traits of urban trees: air pollution mitigation potential

Multitemporal Monitoring of Plant Area Index in the Valencia Rice District with PocketLAI

Vegetation chlorophyll content estimation based on model simulation and OLI image

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