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Using spatial analysis to measure city accessibility by intersection density | ArcGIS Resource Center

Using spatial analysis to measure city accessibility by intersection density | ArcGIS Resource Center | Geoprocessing | Scoop.it

Past work has shown the more accessible an urban area, the more walking and public transit use is promoted, whilst car journeys and traffic speeds are reduced. What makes an area accessible and how do we determine if an area is indeed accessible? One factor we can consider is intersection density which has shown to be a valuable measure in determining such accessibility (Ewing and Cervero, 2010) and correlates strongly with encouraging people to get out of their cars and cycle, walk, or take public transportation to work. All this suggests that good land planning and urban design could help reduce car use and, therefore, any related social and environmental costs. GIS analysis has a key role to play in shaping our towns and cities and our future environments. This blog entry shows how I used geoprocessing and spatial analysis in ArcGIS to gain an understanding of spatial patterns of urban accessibility using the USA road network as a case study.

 

The current statistics on commuting to work in the USA show a picture of car dependency with 86% of workers traveling by car (and only 10% carpooling), 5% using public transportation and only 3.5% either cycling or walking to work (ACS 2009). These figures, however, do not show spatial variations across the country which is important for local planning. Within the country there are some very interesting differences in commuting patterns.

 

The American Community Survey 2009 report (McKenzie and Rapino 2011, McKenzie 2010) shows the percentage of workers who commuted by public transport in 2009 at metropolitan and micropolitan statistical areas (metro and micro areas). These are areas used for data collection and publication by Federal statistical agencies. At this scale, public transit use is as high as 30% in the New York-Northern New Jersey-Long Island metro area to as low as 2% in the Louisville/Jefferson County metro area. But how does this compare to the accessibility of these areas?

 

The first step in performing this analysis involves collating appropriate data. I needed to find out the number and density of road intersections in metro and micro-metro areas, so I needed a street dataset and a feature class of Core Based Statistical Areas CBSA, http://www.census.gov/population/metro/). CBSAs are comprised of both metro areas that contain a core urban area of 50,000 or more population, and micro areas that contain an urban core of at least 10,000 (but less than 50,000) population. Each metro or micro area includes at least the county that contains the core urban area plus any adjacent counties that have a high degree of social and economic integration (as measured by commuting to work) with the urban core.

 

To calculate the number of intersections, in each metropolitan area, I developed a custom geoprocessing script tool named Create Junction Connectivity Features which you can download from the Model and Script tool gallery. This Python script tool counts the number of lines connected to each vertex in a line feature class. The only input to the tool is a line feature class (Figure 1).......

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Cartography Tutorial: Trying a new style

Check out http://www.twitch.tv/koibu for the livestream and http://www.reddit.com/r/koibu for updates and information! You can follow me on twitter over at ...
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5 maneiras de encontrar a luz no fim do túnel para dúvidas em Geoprocessamento

5 maneiras de encontrar a luz no fim do túnel para dúvidas em Geoprocessamento | Geoprocessing | Scoop.it
“Vejo muitos usuários dos mais diversos SIGs se lamentarem sobre determinadas limitações de seus SIGs favoritos.”
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ArcGIS 10.2 Tutorial - Map Digitizing

“an experimental work for digitizing maps from reference image....”
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Dicas para possíveis erros ao fazer um CAR – Parte 2

“Muitas vezes são pequenos detalhes que atrasam a realização de um trabalho não é mesmo? Você começou a fazer um CAR, deu errado? Calma! Não precisa se desesperar!”
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Aprenda a baixar o Geocover no site Earth Explorer

Aprenda a baixar o Geocover no site Earth Explorer | Geoprocessing | Scoop.it
 
Sobre o Geocover
Geocover é um projeto de mapeamento da superfície terrestre a partir de mosaicos de imagens Landsat-7 do ano 2000.
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Risk of Flooding from Rivers and Sea Dataset Released as Open Data

Risk of Flooding from Rivers and Sea Dataset Released as Open Data | Geoprocessing | Scoop.it
The UK’s Environment Agency announced at the end of 2014 that it was releasing the Risk of Flooding from Rivers and Sea dataset (formerly known as the National Flood Risk Assessment dataset, NAFRA) as an open data resource.
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Análisis espacial con PyQGIS. Ejemplo: Merge

Análisis espacial con PyQGIS. Ejemplo: Merge | Geoprocessing | Scoop.it
Buena parte de nuestros trabajos GIS se basan en procesar información espacial con objeto de obtener nueva información.
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Spatial Analysis and Introduction to Remote Sensing by Nancy Thomas - YouTube

Spatial Analysis and Introduction to Remote Sensing by Nancy Thomas

Via Yves Mulkers
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20 Trucos de QGIS que quizá no conocías

20 Trucos de QGIS que quizá no conocías | Geoprocessing | Scoop.it
“Si eres usuario de QGIS es probable que no seas consciente de todo el potencial del que dispone y no estés sacando el máximo provecho a las herramientas que nos ofrece.”
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Operations Dashboard for ArcGIS v10.3 is live now!

Operations Dashboard for ArcGIS v10.3 is live now! | Geoprocessing | Scoop.it
“Operations Dashboard for ArcGIS just released it’s 10.3 update and you can download it from ArcGIS Online right now!”
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How Does Lidar Work?

How Does Lidar Work? | Geoprocessing | Scoop.it
“This NEON Science video overviews what lidar or light detection and ranging is, how it works and what types of information it can provide. Continue reading → Click Title to Continue Reading...”
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Orfeo Monteverdi 1.22: Fusão de Imagens Landsat-7

Orfeo Monteverdi 1.22: Fusão de Imagens Landsat-7 | Geoprocessing | Scoop.it
“ Sobre o Orfeo Monteverdi Estes são os procedimentos para realização de uma fusão de imagens Landsat-7 no software livre Orfeo Monteverdi: Concatenate Images: Realiza a Composição Colorida RGB; Superimpose: Dimensiona a imagem concatenada para a...”
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ArcGIS 10.2: Spatial Join – Contagem de Pontos no Poligono

ArcGIS 10.2: Spatial Join – Contagem de Pontos no Poligono | Geoprocessing | Scoop.it
“ Sobre União Espacial Permite unir atributos de uma feição para outra baseado no relacionamento espacial. Utilize as técnicas de União Espacial do ArcGIS para obter o valor da contagem de pontos que estão contidos no polígono.”
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Alexandre Neto's blog: Etiquetas com guias em QGIS e Postgis | Labels leading lines with QGIS and Postgis

Alexandre Neto's blog: Etiquetas com guias em QGIS e Postgis | Labels leading lines with QGIS and Postgis | Geoprocessing | Scoop.it
“Recentemente tive necessidade de colocar etiquetas de texto em elementos com geometrias muito próximas, fazendo com que as mesmas colidissem umas com as outras.”
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GeoPlanner for ArcGIS

GeoPlanner for ArcGIS | Geoprocessing | Scoop.it
“Ken Gorton explica aqui como o GeoPlanner se está a tornar numa ferramenta para geodesign cada vez mais poderosa.”
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MDE em zonas costeiras: Alguns Desafios

MDE em zonas costeiras: Alguns Desafios | Geoprocessing | Scoop.it
“A criação de MDE (Modelos Digitais de Elevação) e os desafios de sua utilização em Zonas Costeiras foi tema de um artigo publicado no Journal of Coastal Research , nesse mês de Setembro.”
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ArcGIS Solutions for Water Conservation

ArcGIS Solutions for Water Conservation | Geoprocessing | Scoop.it
Water is arguably our most precious resource, and one we simply cannot live without.  Utilities today are facing unprecedented water shortages due to multiple factors: drought, increasing population needs, and increasing agricultural demands.
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Aprenda a baixar imagens Landsat-7 no site Earth Explorer

Aprenda a baixar imagens Landsat-7 no site Earth Explorer | Geoprocessing | Scoop.it
 
Sobre o Earth Explorer
É um dos sites administrados pelo USGS onde é possível ter acesso ao material de domínio público. Todos os produtos da família Landsat podem ser baixados através desse site, que possui uma interface gráfica muito amigável.
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Python in QGIS and ArcGIS: A Small Example

Python in QGIS and ArcGIS: A Small Example | Geoprocessing | Scoop.it
Often the usage of GIS never touches the world of programming and I think a lot of GIS users today feel fine with using simple tools and try to avoid tools like Python for their daily work.
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Sistemas de Información Geográfica: 30 videos educativos

Sistemas de Información Geográfica: 30 videos educativos | Geoprocessing | Scoop.it
La geolocalización intrínseca en casi todo lo que hacemos, utilizando dispositivos electrónicos, ha logrado que el tema SIG sea cada día más urgente de aplicar.
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SRTM-1 (1 Arc second) now available with large global coverage

SRTM-1 (1 Arc second) now available with large global coverage | Geoprocessing | Scoop.it
“With this post I would like to come back on a topic from September 2014. In this blog post on Digital-Geography I announced that from September 2014 until September 2015 high-resultion SRTM-data will be provided for free by the USGS.”
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USGS: Aprenda a Baixar o DEM SRTM de 30m no site Earth Explorer

USGS: Aprenda a Baixar o DEM SRTM de 30m no site Earth Explorer | Geoprocessing | Scoop.it
“ Sobre o Earth Explorer É um dos sites administrados pelo USGS onde é possível ter acesso à dados de domínio público. Todos os produtos da família Landsat podem ser baixados através desse site, que possui uma interface gráfica muito amigável.”
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Short Announcement: “Quality Check” on SRTM1

Short Announcement: “Quality Check” on SRTM1 | Geoprocessing | Scoop.it
“Well, I was expecting this. Damn, those new SRTM1 raster files provided via EarthExplorer by the USGS are sweet.”
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UAVs: The new trend in acquiring geospatial data through remote sensing

UAVs: The new trend in acquiring geospatial data through remote sensing | Geoprocessing | Scoop.it
“Learn why the world is looking forward for UAVs for collection and creation of aerial imagery”
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Semi-Automatic Classification Plugin v.4.0 Beta Available

Semi-Automatic Classification Plugin v.4.0 Beta Available | Geoprocessing | Scoop.it
“The beta version of the Semi-Automatic Classification Plugin v.4.0 "Frascati" is available through the the Facebook group and the Google+ Community. The main new features of the plugin are described in my previous post here.”
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