The methodology is illustrated by an application to the geographic structure of measles epidemics among 22 states of the northeastern United States, New York City, and Washington, D. C., from 1962 to 1988. The patterns identified are interpreted in terms of the spatial behavior of measles ...
1、The United States,Chapter 1 0 The Land,Location, Size ,and Administrative Areas,9 166 601 square kilometers (4th largest country of world) 50 states and a federal district (the District of Columbia,Geographic Features,The highlands in the east, the mountains in the west ,a vast plain ...
The geographic spread of the human immunodeficiency virus (HIV) epidemic reflects multiple subepidemics in different regions and population groups.To descr... DJ Hu,PL Fleming,MA Mays,... - 《Archives of Internal Medicine》 被引量: 48发表: 1994年 加载更多来源...
Assessing the geographic distribution of same sex and opposite sex couples across the United States: implications for claims of causality between traditional marriage and same sex unions Abstract The percent of households headed by married couples has recently fallen below 50%, while the percent of un...
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Geographic information system and Perl computer programming language tools were used to create map coverages of soil properties including soil texture and rock fragment classes, depth-to-bedrock, bulk density, porosity, rock fragment volume, particle-size (sand, silt, and clay) fractions, available ...
which contain information about where ISPs say they can provide service within 10 business days. It's measured at the census block level -- the smallest geographic area used by the US Census Bureau -- and if only one home in a census block can get service, the whole block i...
GeoJSON is a format for encoding a variety of geographic data structures. For Intensive Documentation and Tutorials, Refer toGeoJson Blog. Maybe. Never overwrite the hard work of other contributors or blindly import data into OSM without first checking the local quality. While our metrics show th...
.1 TheUnitedStates Chapter10TheLand .2 Ⅰ.Location,Size,andAdministrativeAreas 9166601squarekilometers(4 th largestcountryofworld) 50statesandafederaldistrict(theDistrictofColumbia) .3 Ⅱ.GeographicFeatures Thehighlandsintheeast,themountainsinthewest,avast plainregioninbetween 1.TheEastern Highlands Appalachia...