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8 Extraction and Modeling of Urban Attributes Using Remote Sensing Technology David ]. Cowen and John R. Jensen Since the earliest developments in urban sociology and geography (Harris and Ullman, 1945), researchers have recognized the essential spatial element of urban development. Remote sensing provides an opportunity to measure at- tributes of urban and suburban environments and record the data in accurate digital maps and files suitable for analysis with geographic information systems (GIS). These data, together with data available from ground-based observations, can be used to monitor changes in space and time, to develop and validate dy- namic models of urban development, and to forecast future land-use patterns and changes in other urban attributes. Remotely sensed data are thus potentially valuable both to social scientists and to urban planners and other public officials. This chapter first identifies key attributes of urban and suburban environ- ments and evaluates the capability of remote sensing technology to measure these attributes accurately at the requisite levels of temporal, spatial, and spectral reso- lution. It then presents a detailed case example that illustrates how measurements of several of these attributes can be combined to address a social science prob- lem: the development of an empirically based theory of urban residential expan- s~on. REMOTE SENSING OF URBAN/SUBURBAN ATTRIBUTES Humans create complex urban landscapes that are composed of various ma- terials (concrete, asphalt, plastic, shingles, water, grass, soil, and shrubbery) ar- ranged in specific ways to build transportation systems, utility lines, housing, commercial buildings, and public space in order to improve the quality of life. 164
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DAVID J. COWEN AND JOHN R. JENSEN 165 Characteristics of many of these phenomena can be remotely sensed from subor- bital aircraft or from satellites. The information thus derived may be both quali- tative and quantitative. Ten of the major urban/suburban attributes of significant value for under- standing the urban environment are summarized in Table 8- 1. To remotely sense these urban phenomena, it is necessary to understand the temporal and spatial resolution required for each. Temporal resolution refers to how often managers need the information; for example, local planning agencies may need precise population estimates every 5 to 7 years to supplement estimates provided by the decennial census. As an example of required spatial resolution, local population estimates based on building unit counts usually must have a minimum mapping unit of 0.3-5 m (0.98-16.4 ft). The information presented in Table 8-1 was synthesized both from theliterature (e.g., Branch, 1971;Ford, 1979; Jensen, 1983a, b; Haack et al., 1997; Philipson, 1997) and from practical experience. Ideally, there would always be a remote sensing system that could obtain images of the terrain that would satisfy the temporal and spatial resolution requirements specified in Table 8-1. Unfortunately, this is not always the case, as will be demonstrated later in this chapter. Information about urban attributes is also best collected using the specific portions of the electromagnetic spectrum shown in Table 8-1. For example, land cover (U.S. Geological Survey [USGS] Level III) is best acquired using the visible (V: 0.4-0.7 micrometers Semi), near-infrared (NIR: 0.7-1.1 lam), and mid-infrared (MIR: 1.5-2.5 Am) portions of the spectrum. Building perimeter, area, volume, and height information is best acquired using black-and-white pan- chromatic (0.5-0.7 Am) or color imagery. The thermal infrared portion of the spectrum (TIR: 3-12,um) may be used to obtain urban temperature measurements. The relationship between temporal and spatial data requirements for urban/ suburban attributes and the temporal and spatial characteristics of available and proposed remote sensing systems is shown in Figure 8-1. Note that the codes shown on this figure are defined in Table 8-1, while abbreviations used for the various remote sensing systems are defined in the glossary in Appendix B. and in Morain and Budge (1996~. Land Use/Land Cover Urban land-use/land-cover information is required for residential-industrial- commercial site selection, population estimation, and development of zoning regulations (Green et al., 1994~. For this reason, the USGS developed a land-use and land-cover classification system for use with remotely sensed data (Anderson et al., 1976~. Broad Level I classes may be inventoried using the Landsat Multi- spectral Scanner (MSS), with a spatial resolution of 79 x 79 m; the Thematic Mapper (TM), with a resolution of 30 x 30 m; the Systeme pour ['Observation de la Terre (SPOT) High Resolution Visible (HRV) (XS), with a resolution of 20 x
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166 MODELING OFA'ITRIBUTES USING REMOTE SENSING TECHNOLOGY TABLE 8-1 Relationship Between Selected Urban/Suburban Attnbutes and the Remote Sensing Resolutions Required to Provide Such Information Minimum Resolution Requirements Spatial Spectral Temporal Land Use/Land Cover L1 - USGS Level I 5 -10 years20 - 100 m V-NIR-MIR-Radar L2 - USGS Level II 5 -10 years5 - 20 m V-NIR-MIR-Radar L3 - USGS Level III 3 - 5 years1 - 5 m V-NIR-MIR-Pan L4 - USGS Level IV 1 - 3 years0.3 - 1 m Pan Building and Property Line Infrastructure B 1 - building perimeter, area, volume, height 1 - 2 years0.3 - 0.5 m Pan B2 - cadastral mapping (property lines) 1 - 6 months0.3 - 0.5 m Pan Transportation Infrastructure T1 - general road centerline 1 - 5 years1 - 30 m Pan T2 - precise road width 1 - 2 years0.3 - 0.5 m Pan T3 - traffic count studies (cars, airplanes etc.) 5 - 10 min0.3 - 0.5 m Pan T4 - parking studies 10 - 60 min0.3 - 0.5 m Pan Utility Infrastructure U1 - general utility line mapping and routing 1 - 5 years 1 - 30 m Pan U2 - precise utility line width, right-of-way 1 - 2 years 0.3 - 0.6 m Pan US - location of poles, manholes, substations 1 - 2 years 0.3 - 0.6 m Pan Digital Elevation Model (DEM) Creation D1 - large scale DEM 5 - 10 years 0.3 - 0.5 m Pan D2 - large scale slope map 5 - 10 years 0.3 - 0.5 m Pan Socioeconomic Characteristics Sl-localpopulation estimation 5- 7years 0.3- Sm Pan S2- regional/nationalpopulationestimation 5 - 15 years 5 - 20m V-NIR S3 - qualityoflifeindicators 5 - lOyears 0.3 - 30m Pan-NIP Energy Demand and Conservation E1 - energy demand and production potential 1 - 5 years 0.3 - 1 m Pan-NIP E2 - building insulation surveys 1 - 5 years 1 - 5 m TIR Meterological Data Ml-daily weather prediction 30min-12hr 1-8 km V-NIR-TIR M2 - currenttemperature 30 min - 1 hr 1 - 8 km TIR M3 - current precipitation 10 - 30 min 4 km Doppler Radar M4 - immediate severe storm warning 5 - lOmin 4km Doppler Radar MS - monitoring urban heat island effect 12 - 24 hr 5 - 10 m TIR Critical Environmental Area Assessment C1 - stable sensitive environments C2 - dynamic sensitive environments 1 - 2 years1 - lOm V-NIR-MIR 1 - 6 months0.3 - 2 m V-NIR-MIR-TIR Disaster Emergency Response DE1 - pre-emergency imagery 1 - 5 years1 - 5 m V-NIR DE2 - post-emergency imagery 12 hr - 2 days0.3 - 2 m Pan-NIR-Radar DE3 - damaged housing stock 1 - 2 days0.3 - 1 m Pan-NIP DE4 - damaged transportation 1 - 2 days0.3 - 1 m Pan-NIP DES - damaged utilities 1 - 2 days0.3 - 1 m Pan-NIP
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DAVID J. COWEN AND JOHN R. JENSEN 107_ 8 5~ 3 2 L 6 8 5_ . 3_ 2 105_ 8- . 5- . 3 2 .= 104 8 o ca c ~J 3 ct 5- 2 O ~ 103 E ~8 s 3 2 8 5 2 10 8 5 2- . 167 0.3 0.5 1 m 5 10 20 30 100 .. .. .. . .. . .. .. . . ..................................... , , , ~ i,.,.,.,.,.,~,.,.,.,.,., .,.,.,.y~ 52 ~y,~ ~', U1 1 DE1, E2l. T1 }. J C1 ~/ .. .. . .. .. .. . . .. DE3 ~~` ~DE4 _ lday . ,t,t,~ ~:~ ~,~,^ J 11~A ~ .-12hr . . 100 min . _ 3mn. . .. .. .. .. .. .. .. . .. .. .. . . . 1 m 2 3 5 10 15 20 30 lOOm ~_~ .-.-.-...... .................. . . .. Pan, 1 x 1 . hASS4x4. . .. I RS-Pi (1 999) " " PĒn 2.,'5 x 2.5 ,. .. .. ORBIMAGE Orbilieu'3 (1999) .Pan,.1 x 1 . .. .. .. ..... ,,,,,,:~S,.,S.,.40.,x,,,4,, , ,,,,,,,,,, ,,,,,,,,,, ,,,,:,:, ,. . .. .. . ...... ............. ...... ...... ..... .............. ....... ....... ....... ...... .. |(erial Photog.rapl~y . ~,, 0.3,x 0.3 rn (0.98,,x 0.98 ft') 1 g 1 m (3.281 x 3.28'i ft. ........... , ........... .......... ........... ...... ...... ..... , .... ..... ..... .. ,. .. . .. .. ,. .. . .. .. .,: ........... ........... ........... ........... ~, ........... , ........... ........... , , , : ........... ........... . ,. . SPOT HRV"1,2,3 and 4 (1998) lPain 10 x10 __MOS RGx(220Oo2) IRS-1 AB ,,,., ,,, , ,, --~- - --' MSS 10 x=' MIR 20 x 20 LISS-2 36.25 x 36.25 -- - -----: ----- ----- ------ ~-.-- ~ ' IRS-1 CD .-.-.-.,.-.-.-.-.-.,.-.-.-.-.- -.-., -.-.-.-., _ Pan5.8 x5.8 LISS-3 23 x 23 MIR 70 x 70 LANDSAT 7 (1998) ............. Pan ~5 x 1,h, , ............ ........... ........... ........... ........... .... ...................................................................... MODIS* Land 0.25 x 0.25 km '''''Lancl'0.'5O'x O:50'krn'' Ocean 1 x 1 km Atmo 1 x 1 km TIR1 x1 km ,. ,. ,. GOES . VIS0.9X 0.9 km ., TlR8.0X8.0km . ,. ..... ........... ........... ........... ........... ............ ........... ........... ........... . ,. , .......... .......... ........... ........... ........... ........... ........... ........... . ,. ,. ..: .-.-.-.-.. ..-.-.-.-. . ,. NOAA AVHRR LAC1.1 x1.1 km ,. GAC4x4kn~. ................................. . ~ M ETEOSAT VISIR 2.5 x 225 km TIR 5 x 5 ~m .,., ...................... ~, ............................................ , : ........... : ........... Ground .. Doppler Radar .,.,.,., ~, , : , 4x4km l ..... ..... ...... ...... ...... ...... ...... ...... ...... ..... ..... . 1 km . .. lOOOm Skm lOkm . M3 .M4 0.2 0.3 015 .8 1.0 2 3 5 1 110 2 3 5 1112 2 3 5 1113 2 3 1 5 8 1o4 Spatial Resolution in meters FIGURE 8-1 Spatial and temporal resolution requirements for urban/suburban attributes overlaid on the spatial and temporal capabilities of current and proposed remote sensing systems.
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168 MODELING OFA'ITRIBUTES USING REMOTE SENSING TECHNOLOGY 20 m; and the Indian LISS 1-3 (72 x 72, 36.25 x 36.25, and 23.5 x 23.5 m, respectively). For example, Plate 8-1 (after page 182) depicts USGS Level I urban vs. nonurban information for Charleston, South Carolina, extracted from Landsat data for 1973, 1981, 1982, and 1994. Sensors with a minimum spatial resolution of 5-15 m (e.g., SPOT panchromatic [pan] at 10 x 10 m; SPIN-2 TK- 350 at 10 x 10 m; proposed Landsat 7 pan at 15 x 15 m) are required to obtain USGS Level II information, which includes specific types of man-made struc- tures. USGS Level III classes may be inventoried using sensors with a spatial resolution of 1-5 m, such as Indian Remote Sensing (IRS) pan (approximately 5 x 5 m) and the SPIN-2 KVR-1000 (2 x 2 m). Future sensors may include commercial ventures such as EOSAT/Space Imaging IKONOS (1 x 1 m pan), OrbView 3 (1 x 1 m pan), and Indian IRS P5 (2.5 x 2.5 m) (Montesano, 1997~. USGS Level IV classes may best be monitored using high-spatial-resolution sensors, including aerial photography (0.3-1 m), and proposed EarthWatch Quickbird pan (0.8 x 0.8 m) and IKONOS (1 x 1 m). A sensor that collects panchromatic data of 0.3-0.5 m resolution is required to provide detailed Level IV information. RADARSAT provides data with 11- 100 m spatial resolution for Level I and II land-cover inventories, even in cloud-shrouded tropical landscapes where conventional sensors would not be able to penetrate (Leberl, 1990~. Urban land-use/land-cover classes in Levels I through IV have temporal resolution requirements of 1-10 years (see Table 8-1 and Figure 8-1~. All of the sensors mentioned have temporal resolutions of less than 22 days, and thus sat- isfy these requirements. Building and Cadastral (Property Line) Infrastructure Data on building perimeter, area, volume, and height are best obtained using stereoscopic (overlapping) panchromatic aerial photography or other remote sens- ing data with a spatial resolution of 0.3-0.5 m (Jensen, 1995; Warner et al., 1996~. The stereo images are required to visualize features in three dimensions. For example, panchromatic stereoscopic aerial photography with a spatial resolution of 0.3 x 0.3 m (1 ft) was used to extract building perimeter and area information for a residential area in Covina, California (Figure 8-2~. Each building, tree, driveway, fence, and contour can be extracted from this type of data. In many instances, the fence lines are the cadastral property lines. Accurate photogram- metric surveys can meet the new draft Geospatial Positioning Accuracy Stan- dards (Federal Geographic Data Committee, 1997~. If necessary, the property lines can be surveyed by a licensed surveyor and the information overlaid onto the photographic or planimetric map database to represent the legal cadastral (property) map. Many municipalities in the United States are moving toward using such high-spatial-resolution imagery as the source for some cadastral infor- mation and as an image backdrop upon which to depict all surveyed cadastral information.
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DAVID J. COWEN AND JOHN R. JENSEN 169 Detailed data on building height and volume can be extracted from high- spatial-resolution (0.3-0.5 m) stereoscopic imagery (Jensen et al., 1996~. Such information can then be used to create three-dimensional displays of the terrain that one can walk through in a virtual-reality environment if desired (Wolff and Yaeger, 1993) (see Figure 8-3~. Such information provides an extremely useful way to visualize the density and arrangement of structures in a neighborhood, and architects, planners, engineers, and realtors are beginning to use this information for a variety of purposes. It is expected that in the next few years, Space Imaging (1997) and EarthWatch (Quickbird, 1998/1999) will provide such stereoscopic images from satellite-based platforms with approximately 0.8-1 m spatial resolu- tion. Unfortunately, such imagery will still not provide the detailed planimetric (perimeter, area) and topographic (terrain contours, building height and volume) details that can be extracted from high-spatial-resolution large-scale aerial pho- tography. Therefore, a satellite sensor system with 0.3-0.5 m spatial resolution may be required, but it will not be available in the immediate future. Transportation Infrastructure Transportation studies have long relied on remote sensor data to (1) examine the origin and destination of trips; (2) study traffic patterns at choke points such as tunnels, bridges, shopping malls, and airports; (3) analyze metropolitan traffic patterns; (4) conduct parking studies; and (5) evaluate the condition of roads (Mintzer, 1983; Haack et al., 1997~. The general updating of a road network centerline map is a fundamental task that is often done once every 1 to 5 years. In areas with minimum tree density, this task can be accomplished using imagery with a spatial resolution of 1 to 30 m (Lacy, 1992~. If more precise road dimen- sions, such as the exact width of the road and sidewalks, are needed, a spatial resolution of 0.3-0.5 m is required (Jensen et al., 1994~. Currently, only aerial photography can provide such planimetric information (see Figure 8-2~. Next to meteorological investigations, traffic-count studies of automobiles, airplanes, boats, pedestrians, and people in groups require data of the highest temporal resolution, ranging from 5 to 10 minutes. It is difficult to resolve the type of car or boat using even 1 x 1 m data; for this purpose, high-spatial- resolution imagery (0.3-0.5 m) is required. Such information can be acquired only via aerial photography or video sensors that are (1) located on the top edges of buildings looking obliquely at the terrain, or (2) placed in aircraft or helicop- ters and flown repeatedly over the study areas. Parking studies require the same high spatial resolution (0.3-0.5 m) but slightly lower temporal resolution (10-60 minutes). Road and bridge conditions (e.g., cracks, potholes) can be documented using high-spatial-resolution aerial photography (<0.3 x 0.3 m) (Stoeckeler, 1979~.
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74 MODELING OFA'ITRIBUTES USING REMOTE SENSING TECHNOLOGY Utility Infrastructure Urban/suburban environments are enormous consumers of electrical power, natural gas, telephone service, and potable water (Haack,1997~. In addition, they create great quantities of garbage, waste water, and sewage. The removal of storm water from urban impervious surfaces is also a serious problem (Schultz, 1988~. Automated mapping/facilities management (AM/FM) and GIS have been developed to manage extensive right-of-way corridors for various utilities, espe- cially pipelines (Jadkowski et al., 1994~. The most fundamental task is updating maps to show a general centerline of the utility of interest, such as a powerline right-of-way. This task is relatively straightforward if the utility is not buried. Major utility rights-of-way can be observed well in imagery with a spatial resolu- tion of 1-2 m and obtained once every 1-5 years. However, when it is necessary to inventory the exact locations of footpads or transmission towers, utility poles, manhole covers, the true centerline of the utility, the width of the utility right-of- way, and the dimensions of buildings, pumphouses, and substations, a spatial resolution of 0.3-0.6 m is required (Jadkowski et al., 1994~. Creation of a Digital Elevation Model Almost all GISs used for socioeconomic or environmental planning include a digital elevation model (DEM) (Cowen et al., 1995~. Analysts often forget that DEMs are derived from analysis of stereoscopic remote sensor data (Jensen, 1995~. It is possible to extract z-elevation data using SPOT 10 x 10 m data and even Landsat TM 30 x 30 m data for terrain that has not been mapped previously (Gugan and Dowman, 1988~. However, any DEM to be used for an urban/ suburban application should ideally have a z-elevation and x, y coordinates that meet Draft Geospatial Positioning Accuracy Standards (Federal Geographic Data Committee, 1997~. At a minimum, the data should meet the old USGS national map accuracy standards. The only sensor that can provide such information at the present time is stereoscopic large-scale metric aerial photography with a spatial resolution of 0.3-0.5 m. The terrain elevation does not change very rapidly. Therefore, a DEM of an urbanized area need be acquired only once every 5 to 10 years unless there is significant development, and the analyst wishes to compare two DEMs for different dates to determine changes in terrain elevation and identify unpermitted additions onto buildings or changes in build- ing heights. DEM data can be modeled to compute slope and aspect statistical surfaces for a variety of applications (Jensen, 1996~. They can also be used to predict the optimum sites for locating various utilities, as shown earlier in Figure 8-3(d). Digital desktop soft-copy photogrammetry is revolutionizing the creation and availability of special-purpose DEMs by minimizing the need for expensive specialized steroplotting equipment (Petrie and Kennie, 1990; Jensen, 1995~.
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178 MODELING OFA'ITRIBUTES USING REMOTE SENSING TECHNOLOGY every 5 to 10 minutes in severe storm warning mode. Early warnings provided by these meteorological radars have also saved many lives. Finally, daytime and nighttime thermal infrared remote sensor data with high spatial resolution (5-10 m) represent one of the primary methods for obtaining quantitative spatial information on the urban heat island effect (Lo et al., 1997~. Critical Environmental Area Assessment Urban/suburban environments often include sensitive areas such as wet- lands, endangered species habitats, parks, land surrounding treatment plants, and land in urbanized watersheds that provides the runoff for potable drinking water. Relatively stable sensitive environments need be monitored only every 1 to 2 years using a multispectral remote sensor collecting data with a resolution of 1 - 10 m. For extremely critical areas that could change rapidly, multispectral remote sensors (including a thermal infrared band) should obtain data with a resolution of 0.3-2 m every 1 to 6 months. Disaster Emergency Response Recent floods (Mississippi River in 1993; Albany, Georgia, in 1994), hurri- canes (Hugo in 1989, Andrew in 1991, Fran in 1996), tornadoes (every year), fires, tanker spills, and earthquakes (Northridge in 1994) have demonstrated that a rectified predisaster remote sensing image database is indispensable. The predisaster data need be updated only every 1 to 5 years; however, multispectral data with high spatial resolution (1-5 m) should be obtained if possible. When disaster strikes, high-resolution (0.5-2 m) panchromatic and/or near- infrared data should be acquired within 12 hours to 2 days. If the terrain is shrouded in clouds, imaging radar may provide the most useful information. Postdisaster images are registered to the predisaster images, and manual or digital change detection is performed (Jensen, 1996~. If precise, quantitative informa- tion about damaged housing stock, disrupted transportation arteries, the flow of spilled materials, and damage to above-ground utilities is required, it is advisable to acquire postdisaster panchromatic and near-infrared data with a resolution of 0.3-1 m within 1 to 2 days. Such information was indispensable in assessing damages and allocating scarce cleanup resources during Hurricanes Hugo, An- drew, and Fran (Wagman, 1997) and the recent Northridge earthquake. USE OF REMOTE SENSING FOR FORECASTING URBAN RESIDENTIAL EXPANSION The study of residential expansion has a long history that is closely linked to early models of the internal structure of cities in which an urban area is viewed as a series of concentric rings, sectors, or multiple nuclei (Harris and Ullman,1945~.
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DAVID J. COWEN AND JOHN R. JENSEN 179 In those early models, the rate of expansion of the city was treated as a struggle between a series of centrifugal and centripetal forces. In recent decades, re- searchers have attempted to model this process using empirical data. Models ranging from those that emerged from urban ecology literature in the mid-1920s to those based on urban economics of the 1960s, which were founded in rent theory. The general assumption of these models was that land prices would be highest in the center of the city where accessibility was greatest. Wealthier and more mobile residents would trade off accessibility for more space at the periphery, while poorer residents would live near the center of the urban area at higher densities. This model was articulated by Alonso (1964), but was directly related to much earlier work on agricultural land-use theory. An important model of residential growth was developed by Chapin and Weiss (1968~. This model was based on the concept of priming actions that trigger secondary actions and together produce land development. This residen- tial location model was designed to allocate residential units to areas experienc- ing growth. Recent research by Batty and Longley (1994) has taken a fresh look at these urban models and attempted to rework them in light of emerging research in fractal geometry. Most models of urban growth have modeled this diffusion process as a manifestation of random events; however, it is likely that dynamic urban systems are not random, but deterministic in nature. Therefore, a good time series of events that can capture the underlying patterns needs to be estab- lished. Remote sensing that can monitor changes approximately every 3 weeks can provide data not available from traditional sources, such as the decennial census of population and housing. In light of previous attempts to model residential expansion, a major research effort funded by the National Aeronautics and Space Administration was under- taken. This effort focused on the development of an integrated remote sensing and GIS model that could be used to predict urban expansion between census periods (Jensen et al., 1994~. This model was based on a systematic method of capturing and analyzing a wide range of data sources that are indicators of urban development. Unlike previous residential models, this model incorporated cen- sus data, land use/land cover, raster-based satellite imagery, building permit data, and postal code geography. An important goal of the model was to forecast not only future growth patterns, but also the specific number of new single-family homes that might be constructed. To accomplish this goal, it was necessary to measure available land, density of housing units, and residential growth rates. The first component of the model was estimation of the change in the amount of available land for develop- ment. This was done using USGS land-use/land-cover polygons from 1976 and SPOTJ classified multispectral imagery from 1989. A land-use change detection resulted in a data set showing land that was urban in 1976 and land that had been converted to urban by 1989 (Figure 8-4~. The land-use data provide a basis for
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180 MODELING OFATTRIBUTES USING REMOTE SENSING TECHNOLOGY ~<,- \ _ ~ . ~ ~ ~ ~ ~ ~ Hi, /~ a IKE ~e ~'0 \ ~^'5^ ..t _ ~ ~: i ~ ~ ~ a; ~ ~ ~ Ja ckso: ~ ~",/1 'at ~ 2 0 2 4 hales ~ . fag . ~ 4. ~ 01 A A ~\, C ~ ~ ~ ~ .~ ~ COMA b
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DAVID J. COWEN AND JOHN R. JENSEN . ~ . ~ : ~s ~ C 181 ~ 1 .N O ~ 4 Miles ~: FIGURE 8-4 Land-use maps for Columbia, South Carolina, based on (a) 1976 USGS land-use and land-cover data, and (b) 1990 SPOT 20 x 20 m multispectral data. Shaded areas indicate urban land uses. (c) Land converted to urban uses 1976-1990 (shaded areas). determining where development can be expected to occur. In fact, the SPOT multispectral data at a resolution of 20 x 20 m provided a basis for classifying all the land in South Carolina as either developable or undevelopable (Plate 8-2, after page 182~. Developable land consisted of agricultural land, scrub/shrub, and forests. Undevelopable land consisted of bodies of water, wetlands, and publicly owned lands such as parks and military installations. This approach provided a useful static view of potential areas of development throughout the state. Furthermore, government-owned lands and other protected areas that had been identified by the Bureau of the Census were identified in the Topographi- cally Integrated Geographic Encoding Reference (TIGER) line files, and those land-use polygons were extracted from the developable land areas to present a more realistic estimate of the amount of land available for development. Statewide analysis of the 20 x 20 m multispectral data is not economically feasible on a regular basis. However, our research indicates that the higher- resolution 10 x 10 m panchromatic band of SPOT data can be used to detect
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182 MODELING OFATTRIBUTES USING EMOTE SENSING TECHNOLOGY changes on a local level. For example, land-cover changes in the Columbia, South Carolina, metropolitan area have been monitored on a 2-year cycle for the past 8 years. These remotely sensed data were integrated with data on 1990 developable land to provide timely updates that clearly identify where distur- bances are occurring (see Figures 8-5 and 8-6~. This type of synoptic view is more efficient than traditional windshield surveys and much less expensive than aerial photography missions. Once a measure of the amount of developable land had been determined, it was necessary to estimate the average amount of land per housing unit. This component of the residential forecasting model was calculated for each block group on the basis of the 1990 Census of Housing figures at the block level. The average lot size was adjusted on the basis of the actual urban land use, not the 1000 0 1000 2000 Valeted I 1 1 1 1 FIGURE 8-5 SPOT 10 x 10 m data overlaid with developed land (diagonal lines). Note the airport and the Interstate highway system.
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183 _ - , ~ ~ ';- ),. - ~ -. BAJA-, ~ if ~ ; FIGURE 8-6 SPOT 10 x 10 m derived urban land-use changes within census block group polygons derived from SPOT 10 x 10 m data. 1990-1992 changes are in dark gray; 1992-1994 changes are in light gray. total land area of the block group. Therefore, it could be assumed that the figure was representative of the average lot size in that neighborhood at that time. The final factor in the model required a spatially detailed empirical estimate of the residential growth rate throughout the metropolitan area. The best indica- tor of housing changes was a record of 15,303 new single-family building permits for an 11-year period between 1980 and 1990. The permits were geocoded and assigned to block groups. The result was a time-series database for estimating the rate of land-use conversion for small areas. The building permits represent an excellent resource for analyzing spatiotemporal change. The pattern can also be treated as a demographic process a series of births, deaths, and migrations that result in a changing spatial point pattern. From the viewpoint of real estate developers, the housing market progresses through a life cycle that involves the density of houses, or lot size, and the availability of land, or land absorption rate. When all of these data sources are combined, it is possible to visualize the series of events occurring within an urban area with a considerable amount of detail (Plate 8-3, after page 182~. Rather than trying to fit a generalized expansion model to the entire region,
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184 MODELING OFA'ITRIBUTES USING REMOTE SENSING TECHNOLOGY Pre d i`:;t O- 119 q20- 587 588 - 81 ~ 1 1 - 1 ~ SO ~-e ~ 41`i FIGURE 8-7 Number of new houses forecasted in 2005 for census block groups. it was deemed more useful to summarize the temporal aspects of the permit data for each of the 393 block groups. A regression analysis was performed for each block group to determine the relationship between the number of building per- mits and time. The parameters of the regression models (slope and intercept) actually became attributes of the polygons. The Y intercept represented an esti- mate at the start of the study period. The regression coefficient provided a summary of the rate and direction of change throughout the period. The correla- tion coefficient measured the strength of the trend. With the parameters for the regression model for each polygon, this model has the ability to predict the number of housing units through time. By incorporating the availability of land and housing unit size into the model, it is possible to estimate the period when developable land within a block group will become saturated. These models were used to forecast the number of housing units, the amount of available land, and the year of saturation for the years 1992 through 2005 (see Figure 8-7~. This effort lays the foundation for future models that will incorporate spatial informa- tion extracted from remotely sensed data (Halls et al., 1994~. CONCLUSIONS The future interface between social science research and remote sensing depends on what kind of features can be detected and how often the data can be obtained. Remote sensing may be used not only for monitoring change, but also
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DAVID J. COWEN AND JOHN R. JENSEN 185 for conducting surveillance. For example, it may become possible not just to count houses, but to count the number of stories and detect changes in structures. Thus remotely sensed data may provide the ability to check on building regula- tions. It may also be possible to develop some new surrogates for socioeconomic conditions. For example, factors such as lot size, the condition of lawns, numbers of swimming pools, and numbers of vehicles may be used to provide insight into residential quality. These capabilities will also provide extremely valuable inputs for models of residential water usage and the demand for other public services. Table 8-1 and Figure 8-1 reveal that there are a number of remote sensing systems that currently provide some of the desired urban/socioeconomic infor- mation when the required spatial resolution is poorer than 5 x 5 m and the temporal resolution is 1 to 55 days. However, data with very high spatial resolu- tion (< 1 x 1 m) are needed to satisfy many of the requirements for socioeco- nomic data. In fact, as shown in Figure 8-1, the only sensor that currently provides such data on demand is aerial photography (0.3-0.5 m). Neither EOSAT/ Space Imaging (1997) with its 1 x 1 m panchromatic data nor EarthWatch Earlybird (1997) with its proposed 3 x 3 m panchromatic data nor Quickbird with its 0.8-0.8 m data will satisfy all of the data requirements. None of the sensors, except repetitive aerial photography, can provide the 5-60 minute temporal reso- lution needed for traffic and parking studies. It may be necessary to have satellite remotely sensed data with higher spatial resolution (0.3-0.5 m) and temporal resolution (1-3 days) to provide much of the desired detailed urban/suburban socioeconomic information, or to utilize aerial photography. Fortunately, the GOES constellation (East and West) and the European Meteosat provide suffi- cient national and regional weather information at reasonable temporal (30 min- utes) and spatial (1-8 km) resolution. Ground-based Doppler radar provides sufficient spatial (4 x 4 km) and temporal (5-30 minutes) resolution for precipita- tion and intense storm tracking. Finally, while remote sensing provides a valuable way to monitor changes on the earth's surface, it can only suggest details about human activity. To obtain this type of information, it is necessary to have a source of data for monitoring the movement of people; consumer behavior; and a wide range of events relating to crime, health, and other matters. It is also important to note that while such knowledge helps route emergency vehicles to our houses and can help utility companies and urban planners prepare for future developments, there is no ques- tion that our individual rights to privacy may be jeopardized. It is clear that improvements in the spatial and spectral resolution of sensing systems have the potential to impact our privacy by providing public and private organizations with visual clues regarding the activities in our houses or on our property. From a social science perspective, we will soon have the ability to monitor human activity much more closely than has been possible to date. The key question is whether this type of information can be used to create more efficient urban environments and provide for a more equitable distribution of resources and services.
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Representative terms from entire chapter: