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Choosing a Scenic Byway Using Spatial Criteria

Choosing a Scenic Byway Using Spatial Criteria. By Charles Gooley GIS 38 – Spatial Analysis and Modeling Fall, 2010.

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Choosing a Scenic Byway Using Spatial Criteria

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  1. Choosing a Scenic Byway Using Spatial Criteria By Charles Gooley GIS 38 – Spatial Analysis and Modeling Fall, 2010

  2. The presentation is based on “Choosing A Scenic Byway Using Spatial Criteria An Exercise in Planning with GIS”byJoseph Kerski, ESRI Education ManagerArcUser, Spring, 2010Datasets obtained from ESRI ArcUser online website:http://www.esri.com/news/arcuser/

  3. Task to be performedChoose one of four proposed roadways as a new scenic byway in the state of Colorado. Choice based on six criteria used by the National Scenic Byway Nominations Guide, intersection with federal lands, average daily traffic, and river, urban and terrain analyses.

  4. Vision and Mission of the National Scenic Byways Program • The vision of the Federal Highway Administration's National Scenic Byways Program is "To create a distinctive collection of American roads, their stories and treasured places.“ • Our mission is to provide resources to the byway community in creating a unique travel experience and enhanced local quality of life through efforts to preserve, protect, interpret, and promote the intrinsic qualities of designated byways.

  5. Scenic Byway Qualities • Scenic – The heightened visual experience derived from the view of natural and man-made elements. • Natural – Features in a relatively undisturbed state. • Historic – Reflects the historic actions of people. • Cultural – Evidence of the customs or traditions of a distinct group of people. • Archaeological – Physical evidence of a distinct group of people. • Recreational – Outdoor recreational activities in association with and dependent on natural and cultural elements.

  6. Questions Posed By Author • What is the pattern of scenic byways in Colorado? What type of federal lands seem to have the most scenic byways? • Using the scenic byway attribute table, determine the total length of scenic byways in Colorado using the statistics tool. • Describe the location of the five longest scenic byways in Colorado listing towns along the route, and the length of each byway.

  7. Patterns of Scenic Byways • Byways are primarily located in federal lands, (national forests, grasslands, and wildlife refuges) to contribute to the quality of the corridor’s visual environment. • Byways tend to follow rivers. • Byways tend to avoid major urban areas. • Byways avoid Indian or military reservations. • Byways do not always follow named highways. • The total length of scenic byways obtained using the statistics tool in its attribute table is 3322.18 Km (2064.3 mi).

  8. Statistics of The Five Longest Scenic Byways • Using the Attribute table for the Scenic Byways and Cities layers, the following statistics were determined for the five longest byways: • Description • Location • Towns Connected • Length

  9. Information On the Five Longest Scenic Byways

  10. Four Proposed New Scenic Byways • Byway 1 is in west central Colorado between Loma and Rangely. • Byway 2 is in north central Colorado between Silverthorne and Wyoming border. • Byway 3 is in east central Colorado between Byers and the Kansas border. • Byway 4 is in southeast Colorado between Trinidad and the Kansas border.

  11. The Six Qualities Were Assessed and Applied to the Proposed Byways (1-10 scale 10 being best)

  12. The Six Qualities Were Weighted As Follows:

  13. To determine the weighting score for each proposed scenic byway, a field called FinalScore of type float was first added to the proposed byway attribute table.

  14. Then the FinalScore for each proposed byway was computed by right clicking on the new FinalScore field and using the field calculator from the context menu to enter the weighting formula as shown below:

  15. Federal Lands Intersect • Next the amount of proposed byways that intersect federal lands was considered. • The more federal lands that a bypass crosses, the better candidate it will make. • The intersect tool in the Arcmap toolbox was used to determine the amount of federal lands each byway crosses.

  16. Intersect ToolKeeps the polygon areas that are shared by both input layers.

  17. Intersect tool dialog box used to determine length of each bypass that cross federal lands

  18. Byways Intersecting the Most Federal Lands • To determine which byway intersects the most federal lands, segments with a FinalScore of 41.0 (Byway 2) and 43.5 (Byway 4) were selected in the resulting intersect layer using the selection by attributes. • Right click on the Shape Length field for each byway and note the Sum using the Statistics tool. • Byway 4 has the larger length (83.9 Km) that intersects federal lands.

  19. Proposed Byways That Intersect the Most Federal Lands

  20. Weight of Average Annual Daily Traffic (AADT) • Next the Average Annual Daily Traffic was considered. • Less trafficked byways weigh more favorably because a large number of vehicles is antithetical to the whole notion of scenic byways. • The AADT for each proposed byway was determined by selecting each segment of adjoining highway in the highway layer and making each a separate layer. • Using the statistics tool in the attribute table, note the mean for the AATD field for each byway. • Proposed byway 4 has the lowest AATD with 571.6.

  21. Mean Average Daily Traffic for Proposed Byways

  22. River Analysis • The rivers in the west of the state run primarily north/south whereas the rivers in the east run mainly east/west. • Many of the north/south running rivers feed into the National forests. • Proposed byways 1 and 2 cross or follow the most rivers. • Rivers favorably impact the scenic, natural and recreational qualities of a byway, but the other qualities must also be considered.

  23. Urban Areas Analysis • None of the proposed byways is located near highly populated urban areas. • Proposed byways 1 and 3 are closest to urban areas. • Proximity to urban areas is antithetical to the notion of a scenic byway as is AADT.

  24. Terrain Analysis • Proposed Byway 2 and 4 appear to traverse the most varied terrain, and Byway 1 and 3 the least varied. • The relief of the terrain should be a major factor in selection of a byway. • Byway 4 appears to have the widest variety of terrain.

  25. Conclusions • Spatial analysis techniques and data from a variety of sources were used to choose a scenic byway in the state of Colorado. • Four routes were chosen for consideration, and a selection was made based on scenic qualities, intersection of federal lands, average daily traffic, and analyses of rivers, urban areas, and terrain. • Overall, I believe that byway 4, located in the southeast quadrant of the state, contains the best combination of attributes and should be selected as the new scenic byway.

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