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2. Characteristics of Urban Landscape Feature in Local and Regional Scales............................................................................................... 7 2.1 Introductîon ........................................................................................... 7 2.2 Roe of Remote Sensîng for the Urban Landscape ........................... 7 2.3 Appîcatîon of Hîgh-Resoutîon Sateîte Imagery ........................... 9 2.4 Mappîng Urban Land Cover Usîng QuîckBîrd Imagery .............. 12 2.5 Decîsîon Tree Mode for Urban Land Cover Cassîicatîon .......... 14 2.6 Object-Based Image Anaysîs for Urban Land Cover Cassîicatîon........................................................................................ 16 2.7 Summary.............................................................................................. 22
3. Characterization of Urban Land Cover in a Moderate Resolution..... 23 3.1 Introductîon ......................................................................................... 23 3.2 Characterîstîcs of Urban Landscape ................................................ 23 3.3 Mîxîng Features of Urban Landscapes ............................................ 28 3.4 Characterîzatîon of Urban Landscape ............................................. 29 3.4.1 Spectra Mîxture Anaysîs.................................................... 29 3.4.2 Regressîon Tree Agorîthms................................................. 34 3.5 Another Method for Urban Land Cassîicatîon............................. 46 3.5.1 Artîicîa Neura Network .................................................... 46 3.5.2 Support Vector Machîne ....................................................... 48 3.6 Summary.............................................................................................. 49
4. Regional and Global Urban Land Cover Characterizations................ 51 4.1 Introductîon ......................................................................................... 51 4.2 Characterîzatîon of Natîona Urban Land Cover ........................... 52 4.2.1 Deveopment of Natîona Urban Land Cover Product în the Unîted States................................................................52 4.2.2 Updated NLCD Impervîous Surface Product ................... 54 4.2.3 Urban Land Cover Changes în the Unîted States between 2001 and 2011 ..........................................................57 4.3 Regîona and Goba Efforts of Mappîng Urban Land .................. 59 4.4 Mappîng Goba Urban Land Cover from Nîghttîme Lîght Imagery................................................................................................. 63
Map Goba Urban from MODIS Sateîte Data .............................. 65 4.5.1 Urban Extent Deinîtîon ........................................................ 66 4.5.2 Cassîicatîon Too .................................................................. 66 4.5.3 MODIS Data............................................................................ 67 4.5.4 Traînîng Data.......................................................................... 67 4.5.5 Urban Ecoregîon .................................................................... 68 4.5.6 Cassîicatîon of Goba Urban Land Cover ....................... 68 4.5.7 Accuracy Assessment for the Goba-Scae Product ......... 70 New Progresses on Goba Urban Mappîng Effort ........................ 71 4.6.1 Remote Sensîng Data............................................................. 72 4.6.2 Image Cassîicatîon............................................................... 72 4.6.2.1 Landsat Data ........................................................... 72 4.6.2.2 TerraSAR-X Data..................................................... 73 4.6.3 Mutîtempora Change Detectîon........................................ 75 4.6.4 Urban Footprînt and Mutîtempora Change Product ..... 75 Summary.............................................................................................. 75
5. Assessment of Water Quality in Urban Areas........................................ 77 5.1 Introductîon ......................................................................................... 77 5.2 Parameters of Inand Water Quaîty ................................................ 80 5.3 Sateîtes Measurements and Empîrîca Agorîthms for Dîfferent Water Quaîty Parameters ................................................ 85 5.3.1 Ch-a and Aga ...................................................................... 85 5.3.2 Coored DOM ......................................................................... 88 5.3.3 TSS Concentratîon Estîmate ................................................. 89 5.4 Characterîzatîon of Poutant Loadîng în a Watershed ................. 90 5.5 Sateîte-Derîved Water Quaîty Map............................................... 95 5.5.1 Suspended Sedîments în the Lake Chîcot, Arkansas....... 95 5.5.2 Water Propertîes în Chesapeake Bay .................................. 96 5.5.2.1 Sateîte Ch-a Composîte Images ........................ 98 5.5.2.2 Sateîte Images and Tîme Serîes of MODIS TSS Measurements ................................................. 98 5.5.3 Water Quaîty Assessment for Chîna’s Inand Lake Taîhu ...................................................................................... 100 5.6 Summary............................................................................................ 102
6. Natural Hazard Assessment for Urban Environments....................... 105 6.1 Introductîon ....................................................................................... 105 6.2 Urban Deveopment and Land Cover Transîtîon în the Guf of Mexîco Regîon............................................................................... 106 6.3 Food Rîsks în Urban Envîronments Usîng Medîum-Resoutîon Remote Sensîng ............................................................. 111 6.4 Landsîde Assessment în Coasta Urban Areas............................ 114 6.4.1 Detectîon of Landsîdes Usîng Remote Sensîng în Hong Kong............................................................................ 115
6.4.2 Assessment of Landsîde Envîronment în the Seatte Area........................................................................................ 118 6.4.2.1 Remote Sensîng Data ........................................... 120 6.4.2.2 Impervîous Surface Estîmate.............................. 120 6.4.2.3 Evoutîon of Landsîdes în the Seatte Urban Area ........................................................................ 122 Summary............................................................................................ 127
7. Air Quality in Urban Areas—Local and Regional Aspects............... 129 7.1 Overvîew ............................................................................................ 129 7.2 Sateîte Retrîevas............................................................................. 132 7.3 Medîum-Resoutîon Sateîte Remote Sensîng.............................. 133 7.3.1 ERS-2...................................................................................... 133 7.3.2 Terra ....................................................................................... 133 7.3.3 Envîsat ................................................................................... 136 7.3.4 Aqua and Aura..................................................................... 136 7.3.5 MetOp.................................................................................... 137 7.3.6 Other Patforms.................................................................... 137 7.4 Specîes Observatîons ........................................................................ 138 7.4.1 Trace Gases ........................................................................... 138 7.4.2 Aeroso Remote Sensîng ..................................................... 140 7.5 Assessments of Aîr Quaîty în Urban Areas................................. 141 7.5.1 Assessment of PM2.5Dîstrîbutîon...................................... 141 7.5.2 Nîtrogen Dîoxîde.................................................................. 143 7.5.3 Ozone..................................................................................... 146 7.6 Urban Land Cover and Aîr Quaîty ............................................... 147 7.7 Summary............................................................................................ 150
8. Air Quality in Urban Areas—Global Aspects..................................... 153 8.1 Introductîon ....................................................................................... 153 8.2 Sateîte Systems for Goba Aîr Quaîty Assessment.................. 156 8.3 Methods of Estîmatîng the Aeroso Anthropogenîc Component......................................................................................... 157 8.4 Appîcatîons of Remote Sensîng for Goba Aîr Quaîty Assessment......................................................................................... 160 8.4.1 Characterîzatîon of Goba PM2.5Dîstrîbutîon ................ 160 8.4.2 Intercontînenta Transport of Poutant ............................ 163 8.5 Summary............................................................................................ 167
9. Urban Heat Island and Regional Climatic Effect................................ 169 9.1 Introductîon ....................................................................................... 169 9.2 Cacuatîon of LST from Remote Sensîng...................................... 171 9.2.1 AVHRR Instrument ............................................................. 171 9.2.2 Landsat Imagery .................................................................. 173 9.2.3 MODIS ................................................................................... 174
Quantîicatîon of UHI Usîng Remotey Sensed LST Products ... 174 9.3.1 UHI Effects în a Loca Scae ............................................... 175 9.3.2 Anaysîs of UHI Usîng Grîdded Temperature and Land Cover Datasets ...........................................................178 9.3.3 UHI Effect across the Contînenta Unîted States ............ 182 9.3.4 Regîona UHI Effects în Europe ........................................ 185 Goba Aspect of UHI Effect ............................................................ 187 Cîmate Impacts of UHI ................................................................... 188 Summary............................................................................................ 190
Contînued urbanîzatîon, popuatîon growth, economîc actîvîtîes, and goba cîmate change have made assessîng, modeîng, and understandîng urban areas chaengîng. The need for technoogîes, whîch wî enabe monîtorîng of urban assets and managîng exposure to natura and man-made rîsks în cîtîes, îs rapîdy growîng (Weng and Quattrochî, 2006). Urban envîronmen-ta probems have become unprecedentedy compeîng în the twenty-irst century. Thîs îs not ony because cîtîes and towns are the orîgîna producers of many of the envîronmenta probems reated to waste dîsposa and aîr and water poutîon but aso because the împact of goba cîmate change on urban areas îs becomîng a matter of growîng concern (Weng, 2014). Remote sensîng has been an effectîve technoogy to observe, measure, monîtor, and mode many of the components that comprîse urban envîronmenta systems and ecosystems cyces (Weng, 2012). Urban remote sensîng has emerged as a new frontîer în the Earth observatîon technoogy; the voume of îterature has încreased rapîdy sînce 2000 (Weng, 2014). I am peased that Dr. GeorgeZ. Xîan has the vîsîon and energy to wrîte a book on thîs împortant topîc. Dr. Xîan îs an înternatîonay renowned expert în the ied of urban remote sensîng and has been înstrumenta în the success of the Natîona Land Cover Database deveopment. In the context of goba urbanîzatîon and envîronmenta changes and havîng recognîzed the beneits of urban îmagîng and mappîng technîques, Group on Earth Observatîon, an înternatîona organîzatîon for expoîtîng the Earth observatîon technoogîes to support decîsîon makîng, cas for deve-opment of a goba urban observatîon and înformatîon system. Group on Earth Observatîon decîded to estabîsh, în îts 2012–2015 Work Pan, a new project Goba Urban Observatîon and Informatîon. The maîn objectîves of thîs project are to împrove the coordînatîon of urban observatîons, monî-torîng, forecastîng, and assessment înîtîatîves wordwîde; to produce up-to-date înformatîon on the status and deveopment of the urban systems at dîfferent scaes; to i exîstîng gaps în the întegratîon of goba urban and observatîons wîth varîous urban ancîary datasets; and to deveop înnova-tîve concepts and technîques în support of effectîve and sustaînabe urban deveopment (Weng et a. 2014). Sînce the begînnîng of thîs program, Dr. Xîan has been a strong supporter and serves as a coead, workîng wîth me and many coeagues to advance the project and achîeve îts goas. Thîs book marks the thîrteenth voume în theTayor & Francis Group Series in Remote Sensing Appicationsîts înîtîatîon în 2007. It îs aso our ifth sînce book on urban areas. Together, these books contrîbute to recent deveopments în the theorîes, methods, and appîcatîons of urban remote sensîng. As des-îgnated, the serîes aîms to serve as a reference for professîonas, researchers,
and scîentîsts, as we as textbooks for teachers and students. I hope that the pubîcatîon of thîs book wî promote wîder and better use of remote sensîng data, scîence, and technoogy and wî facîîtate the assessîng, monîtorîng, and managîng of cîtîes, thehabitat for over haf of the word’s popuatîon. I congratuate Dr. Xîan on thîs împortant mîestone în hîs career.
Qihao Weng Hawthorn Woods
References Weng, Q. (2012). Remote sensîng of împervîous surfaces în the urban areas: requîre-ments, methods, and trends.Remote Sensing of Environment, 117(2), 34–49. Weng, Q. (2014). What îs specîa about goba urban remote sensîng? In:Goba Urban Monitoring and Assessment through Earth Observation,Weng, Q. (Ed.). CRC Press/ Tayor and Francîs Group, Boca Raton, FL, Chapter 1, pp. 1–12. Weng, Q., Esch, T., Gamba, P., Quattrochî, D.A., and Xîan, G. (2014). Goba urban observatîon and înformatîon: GEO’s effort to address the împacts of human settements.In:Goba Urban Monitoring and Assessment through Earth Obser-vation,Weng, Q. (Ed.). CRC Press/Tayor and Francîs Group, Boca Raton, FL, Chapter 2, pp. 15–34. Weng, Q. and Quattrochî, D.A. (2006).Urban Remote Sensing. CRC Press/Tayor and Francîs Group, Boca Raton, FL, p. 432.
Over the past 50 years, urban deveopment has dramatîcay încreased around the word. Assocîated wîth urban expansîons are încreases în urban popua-tîons and and use. Popuatîon growth wî be partîcuary rapîd în the urban areas of ess deveoped regîons and amost a the growth of the word’s tota popuatîon between 2000 and 2030 îs expected to occur în the urban areas of those regîons. In addîtîon, the proportîon of the popuatîon îvîng în urban areas îs expected to încrease substantîay by 2030 în the most deve-oped regîons. In the Unîted States, economîc growth and popuatîon boom spurred încreased suburbanîzatîon, whîch shîfted resîdentîa areas to the outyîng sectîons of a cîty or to separate munîcîpaîtîes on the frînge of urban areas. The încreasîng concentratîon of urban popuatîons and many of the word’s argest cîtîes beîng outsîde the hîghest încome natîons represents an împortant change. Urban areas are becomîng more and more împortant for current and future human settements. Throughout the word, and use and and cover changes assocîated wîth încreasîng urbanîzatîon have had sîgnîicant împacts on at the oca, regîona, and even goba scaes. Landscape and envîronmenta changes caused by urbanîzatîons are sîgnîicant în amost a urban areas. For exampe, urban and uses permanenty change natura ands to anthropogenîc împervîous surfaces. These changes aso înluence the status of the ecosystem by aterîng many bîophysîca characterîstîcs such as surface temperature, soî moîsture content, and vegetatîon coverage. In addîtîon, human settement not ony changes natura andscapes, but aso transports many chemîca compo-nents to urban water and aîr systems. Severa envîronmenta consequences are assocîated wîth runoff în urbanîzed watersheds, încudîng încreases în runoff voume, oss of nutrîents, and sîgnîicant osses of oî and grease and certaîn heavy metas. Rapîdy buît-up and may become a threat to surface water quaîty when tota runoff încreases, and hydroogîc împaîrment eads to erosîon and sedîmentatîon. The dîrect împacts of urbanîzatîon încude the degradatîon of water resources and water quaîty when surface runoff transports non–poînt source poutants from theîr source areas to receîvîng akes and streams. Poutants eîther dîssoved or suspended în water or asso-cîated wîth sedîment, încudîng nutrîents, heavy metas, and oî and grease, can accumuate and wash away from urban areas. Therefore, împervîous surfaces în urban areas have been consîdered as a key envîronmenta îndîca-tor of the heath of urban watersheds and as an îndîcator of non–poînt source poutîon or pouted runoff. Urban areas as human settement centers may face aîr quaîty îssues when aîr poutîon reaches certaîn eves. Aîr poutîons încudîng partîces and chemîca components emîtted from surfaces can be caused by îndîvîdua sources on the urban scae, as we as on the oca scae.