Google Earth engine (GEE) - gpwv411: data set of average administrative unit area

GPWv411： Average administrative unit area （ World grid population version 4 . 11）

Dataset availability

2000-01-01T00:00:00Z - 2020-01-01T00:00:00

Data set provider

International geoscience information network center NASA SEDAC

Earth engine fragment

ee.Image("CIESIN/GPWv411/GPW_Mean_Administrative_Unit_Area")

World grid population No 4 edition (GPWv4) The first 11 Version in 30 Angular second （ about 1 km ） The grid element is simulated 2000、2005、2010、2015 and 2020 Distribution of global population in . Use the population census and the population distribution of administrative units to allocate the population to cells in proportion . Population input data to 2005 - 2014 What happened in 2010 The most detailed spatial resolution collection available in the annual census results . Input data extrapolation to produce population estimates for each simulation year .

Create the average area of the input cells for the population count and density grid .

Band ：

The resolution of the
927.67 rice

Band

full name	Sensitive	maximum	describe
mean_administrative_unit_area	0*	767642*	Display a quantitative surface , This surface indicates the size of the input units in square kilometers , Population counts and density grids are derived from these units .

* Estimated minimum or maximum value

Citations:

• Center for International Earth Science Information Network - CIESIN - Columbia University. 2016. Gridded Population of the World, Version 4 (GPWv4): Mean Administrative Unit Area, Revision 11. Palisades, NY: NASA Socioeconomic Data and Applications Center (SEDAC). Data Quality Indicators, v4.11: Gridded Population of the World (GPW), v4 | SEDAC. Accessed DAY MONTH YEAR.

• ​​​​​​Data Quality Indicators, v4.11: Gridded Population of the World (GPW), v4 | SEDAC

Code ：

var dataset = ee.Image("CIESIN/GPWv411/GPW_Mean_Administrative_Unit_Area");
var raster = dataset.select('mean_administrative_unit_area');
var raster_vis = {
  "min": 0.0,
  "palette": [
    "ffffff",
    "747474",
    "656565",
    "3c3c3c",
    "2f2f2f",
    "000000"
  ],
  "max": 40000.0
};
Map.setCenter(-88.6, 26.4, 1);
Map.addLayer(raster, raster_vis, 'mean_administrative_unit_area');

Download function ：

Export.image.toDrive(image, description, folder, fileNamePrefix, dimensions, region, scale, crs, crsTransform, maxPixels, shardSize, fileDimensions, skipEmptyTiles, fileFormat, formatOptions)

Create a batch task to export the image as a raster to the cloud hard disk . It can be downloaded from “ Mission ” Tab Start task .“crsTransform”、“scale” and “dimensions” They are mutually exclusive. .

argument ：

picture （ picture ）：

Image to export .

describe （ character string , Optional ）：

The human readable name of the task . May contain letters 、 Numbers 、-、_（ No spaces ）. The default is “myExportImageTask”.

Folder （ character string , Optional ）：

Export the... That will reside Google Drive Folder . Be careful ：(a) If the folder name exists at any level , Write the output to it ,(b) If there are duplicate folder names , Write the output to the recently modified folder , (c) If the folder name does not exist , A new folder will be created in the root directory , also (d) Folder name with separator （ for example ,'path/to/file'） Is interpreted as a literal string , Not the system path . Default to drive root .

File name prefix （ character string , Optional ）：

File name prefix . May contain letters 、 Numbers 、-、_（ No spaces ）. Default to description .

Size （ Numbers | character string , Optional ）：

The size used to export the image . Take a single positive integer as the maximum dimension or “WIDTHxHEIGHT”, among WIDTH and HEIGHT Are positive integers .

Area （Geometry.LinearRing|Geometry.Polygon|String , Optional ）：

A linear ring representing the region to be derived 、 Polygons or coordinates . These can be specified as coordinates of geometric objects or serialized as strings . If not specified , Then the region defaults to viewport... When called .

scale （ Numbers , Optional ）：

In meters / Resolution in pixels . The default is 1000.

crs （ character string , Optional ）：

For exporting images CRS.

crsTransform （ list < Numbers >| character string , Optional ）：

Affine transformation for exporting images . Need to define “crs”.

maxPixels （ Numbers , Optional ）：

Limit the number of pixels in the export . By default , If the export exceeds 1e8 Pixels , You will see the error . Setting this value explicitly allows you to raise or lower this limit .

shardSize （ Numbers , Optional ）：

The size of the tile in which this image will be calculated （ In pixels ）. The default is 256.

File dimension （ list < Numbers >| Numbers , Optional ）：

Pixel size of each image file （ If the image is too large to fit into a single file ）. You can specify a number to represent a square , Or specify a two-dimensional array to represent （ Width , Height ）. Please note that , The image will still be cropped to the overall image size . Must be shardSize Multiple .

skipEmptyTiles （ Boolean value , Optional ）：

If it is true , Then skip writing empty （ Completely shielded ） Image block . The default is false .

File format （ character string , Optional ）：

The string file format to which the image is exported . Currently only supported “GeoTIFF” and “TFRecord”, The default is “GeoTIFF”.

formatOptions (ImageExportFormatConfig, optional):

A dictionary of string keys to format specific options