Their large work forces have helped to drive their economic growth. This is a sea change for Europe, the United States, China and other top economies, which have had some of the most working-age people in the world, adjusted for their populations. And today’s wealthier countries will almost inevitably make up a smaller share of global G.D.P., economists say. In all of recorded history, no country has ever been as old as these nations are expected to get.Īs a result, experts predict, things many wealthier countries take for granted - like pensions, retirement ages and strict immigration policies - will need overhauls to be sustainable. Extraordinary numbers of retirees will be dependent on a shrinking number of working-age people to support them. That’s almost twice the share of older adults in Florida, America’s retirement capital. The projections are reliable, and stark: By 2050, people age 65 and older will make up nearly 40 percent of the population in some parts of East Asia and Europe. China is shrinking, with India, a much younger country, overtaking it this year as the world’s most populous nation.īut what we’ve seen so far is just the beginning. The world’s demographics have already been transformed. In old populations, at least a quarter of the population is 65 or older. World Population Prospects 2022 Young populations are those in which at least a quarter of the population is under age 15. This means that it may take a while to download these files, and that you will need a fast PC to work with them.Source: U.N. High resolution files for large areas (countries) can be very large. A cell with a 30 seconds resolution is about 0.8 km2 at the equator and smaller at higher latitudes. The size in square meters varies with latitude. When the cell size is small (e.g., 30 seconds), resolution is high. The units are in (arc) degrees, minutes or seconds. The resolution is the size of each grid cell expressed as the length of one side of one (square) cell. For the other gridfiles, NODATA is only used for areas covered with water, except for the land cover grids, on which water is a separate class.Ī DBF (dBase file) is a dbase format database table. For these areas, the value is "NODATA" (indicating the absence of data for those cells). ( More info on format for developers).Ī gridfile with "country mask" indicates that the areas outside the selected country are masked out. From DIVA-GIS they can be exported to a number of other grid formats including IDRISI and Arc or to shapefiles. Shapefiles contain a single class of "vector" data such as points, lines, or polygons. It can be imported to most other GIS programs. This is a commonly used format that can be directly used in Arc-anything, DIVA-GIS, and many other programs. Grid (raster) data are stored as DIVA gridfilesĮach "shapefile" consist of at least three actual files. Vector data are stored as ESRI shapefiles You can use programs such as 7-zip, PKZIP or StuffIt to decompress the files. The files have been compressed and grouped in ZIP files. National Imagery and Mapping Agency's (NIMA) database of foreign geographic feature names They can also be used to map localities, however you can download more recent files from NIMA The files should be placed in the \gazet directory. The files you can download here are for use in DIVA for automatic georeferencing (to assign coordinates to places). Global gridded population databaseĪ gazetteer is a list of place names and their coordinates. Land cover, original data resampled onto a 30 seconds gridĬIESIN, 2000. Seperate files for line and area features The level of subdivision varies between countries Select and download free geographic (GIS) data for any country in the worldĬountry outlines and administrative subdivisions for all countries.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |