The Sichuan-Tibet Highway, a high-elevation road between Chengdu and Tibet where landslides and rock avalanches are common, is undoubtedly part of the problem.
The association between elevation and landslides is perplexing but is perhaps due to the location of logging road at specific elevations (roads could not be included in the input data for analysis because they have not been adequately mapped).
We compiled elevation and road length data for three classes of roads using raw data from ESRI StreetMap USA Environmental Systems Research Institutee, Inc., Redlands, CA), land use types from the U.S. Geological Survey's National Land Cover Database 2001 (Multi-resolution Land Characteristics Consortium 2007), and population density from U.S. 2000 Census data in each 4-km grid cell.
Elevation and road affect human communication, which means that the above "NTD baseline-road-elevation" pattern consistency can play a significant role in NTD occurrences in the mountainous areas of the Heshun county.
The spatial properties for building risks are based on topography, flood inundation, building location, building elevation, and road access to determine five categories of vulnerability, vulnerable basement, flooded basement, vulnerable first-floor, flooded first-floor, and road access.
Possible solutions include the elevation of roads or construction of well-designed drainage structures leading to the creeks.
Other objects such as digital elevation model, roads (existing and design), buildings, tunnels, existing walls, isophones and local weather conditions have been studied.
Based on the ground observations, correlations between the landscape services and spatial characteristics (e.g. elevation, soil, road-type) were calculated within a neighbourhood with a radius of 0 m, 50 m, and 100 m.
GIS layers depicting human land use, elevation, slope, roads and population data were obtained and summarized at two spatial scales, within provinces and for 100 km2 grid cells covering the country's entire agricultural land area.
