The data presented below represent the predicted number of people per ~100 m pixel as estimated using the random forest (RF) model as described in Stevens, et al. (In Press). The following pages contain a description of the RF model and its covariates, their sources and any metadata collected for each covariate. The prediction weighting layer is used to dasymetrically redistribute the census counts and project counts to match estimated populations based on UN estimates for the final population maps provided by AfriPop, AsiaPop and AmeriPop.
These data are the population density values used to estimate the RF model used to create the prediction weighting layer you see above. Values represent population density as measured by people per hectare and calculated from population counts within each census unit. These values are used as the dependent variable during model estimation.
Folder: Census
File Name: Malawi2008CensusEAs_WGS84_edited2.shp
Source: National Statistical Office, Malawi
Description: These census data were purchased from NSO using grant to RW Snow from Department for International Development UK. We also acknowledge Kingsley Mandaacquired. Required fields for map production are ADMINID and ADMINPOP.
Class: polygon
Derived Covariates:
area, buff, zones,
class : SpatialPolygonsDataFrame
nfeatures : 12666
extent : 464484, 814001, 8105168, 8964939 (xmin, xmax, ymin, ymax)
coord. ref. : NA
nvariables : 25
These output and figures outline the estimated RF model that is used to predict the population density weighting layer. The model is fitted to the population density values for the preceding census data using covariates aggregatedfrom the ancillary data sources summarized following the model diagnostics.
Call:
randomForest(x = x_data, y = y_data, ntree = popfit$ntree, mtry = popfit$mtry, nodesize = length(y_data)/1000, importance = TRUE, proximity = TRUE)
Type of random forest: regression
Number of trees: 500
No. of variables tried at each split: 13
Mean of squared residuals: 0.4
% Var explained: 81
Folder: Landcover
File Name: mwi_lc2.tif
Source: GlobCover, 300m
Description: Landcover from the GlobCover product resampled to 100m, refined with detailed Landsat-derived settlement extents (Tatem et al. 2004,2005), reclassified to match AfriPop coding and eventually broken down into binary classifications by aggregated land cover type (see Linard, et al., 2010 and Gaughan, et al. 2013 for category information).
Class: raster
Derived Covariates:
prp011, cls011, dst011, prp040, cls040, dst040, prp130, cls130, dst130, prp140, cls140, dst140, prp150, cls150, dst150, prp160, cls160, dst160, prp190, cls190, dst190, prp200, cls200, dst200, prp210, cls210, dst210, prp230, cls230, dst230, prp240, cls240, dst240, prp250, cls250, dst250, prpBLT, clsBLT, dstBLT,
class : RasterBrick
dimensions : 8608, 3567, 30704736, 1 (nrow, ncol, ncell, nlayers)
resolution : 100, 100 (x, y)
extent : 463947, 820647, 8104139, 8964939 (xmin, xmax, ymin, ymax)
coord. ref. : +proj=utm +zone=36 +south +datum=WGS84 +units=m +no_defs +ellps=WGS84 +towgs84=0,0,0
data source : D:\APRF\RF\data\MWI\Landcover\Derived\landcover.tif
names : landcover
min values : 11
max values : 250
Folder: NPP
File Name: DEFAULT: MODIS 17A3 2010
Source: United States Geological Survey (USGS)
Description: MODIS 17A3 version-55 derived estimates of net primary productivity for the year 2010, estimated for 1km pixel sizes and subset and resampled to match the available land cover and final population map output requirements.
Class: raster
Derived Covariates:
,
class : RasterBrick
dimensions : 8608, 3567, 30704736, 1 (nrow, ncol, ncell, nlayers)
resolution : 100, 100 (x, y)
extent : 463947, 820647, 8104139, 8964939 (xmin, xmax, ymin, ymax)
coord. ref. : +proj=utm +zone=36 +south +datum=WGS84 +units=m +no_defs +ellps=WGS84 +towgs84=0,0,0
data source : D:\APRF\RF\data\MWI\NPP\Derived\npp.tif
names : npp
min values : 0
max values : 10821
Folder: Lights
File Name: DEFAULT: VIIRS 2012
Source: http://ngdc.noaa.gov/eog/viirs/download_viirs_ntl.html
Description: These 'Lights at Night' data were derived from imagery collected by the Suomi National Polar-orbiting Partnership (NPP) Visible Infrared Imaging Radiometer Suite (VIIRS) sensor. Data were collected in 2012 on moonless nights and though background noise associated with fires, gas-flares, volcanoes or aurora have not been removed it represents the best-available data for night-time light production.
Class: raster
Derived Covariates:
,
class : RasterBrick
dimensions : 8608, 3567, 30704736, 1 (nrow, ncol, ncell, nlayers)
resolution : 100, 100 (x, y)
extent : 463947, 820647, 8104139, 8964939 (xmin, xmax, ymin, ymax)
coord. ref. : +proj=utm +zone=36 +south +datum=WGS84 +units=m +no_defs +ellps=WGS84 +towgs84=0,0,0
data source : D:\APRF\RF\data\MWI\Lights\Derived\lights.tif
names : lights
min values : -0.049
max values : 622
Folder: Temp
File Name: DEFAULT: BIO1
Source: http://www.worldclim.org/current
Description: WorldClim/BioClim 1950-2000 mean annual precipitation (BIO12) and mean annual temperature (BIO1) estimates (Hijmans et al., 2005) were downloaded, mosaicked and subset to match the extent of our land cover data for the mapping of this region.
Class: raster
Derived Covariates:
,
class : RasterBrick
dimensions : 8608, 3567, 30704736, 1 (nrow, ncol, ncell, nlayers)
resolution : 100, 100 (x, y)
extent : 463947, 820647, 8104139, 8964939 (xmin, xmax, ymin, ymax)
coord. ref. : +proj=utm +zone=36 +south +datum=WGS84 +units=m +no_defs +ellps=WGS84 +towgs84=0,0,0
data source : D:\APRF\RF\data\MWI\Temp\Derived\temp.tif
names : temp
min values : 112
max values : 269
Folder: Precip
File Name: DEFAULT: BIO12
Source: http://www.worldclim.org/current
Description: WorldClim/BioClim 1950-2000 mean annual precipitation (BIO12) and mean annual temperature (BIO1) estimates (Hijmans et al., 2005) were downloaded, mosaicked and subset to match the extent of our land cover data for the mapping of this region.
Class: raster
Derived Covariates:
,
class : RasterBrick
dimensions : 8608, 3567, 30704736, 1 (nrow, ncol, ncell, nlayers)
resolution : 100, 100 (x, y)
extent : 463947, 820647, 8104139, 8964939 (xmin, xmax, ymin, ymax)
coord. ref. : +proj=utm +zone=36 +south +datum=WGS84 +units=m +no_defs +ellps=WGS84 +towgs84=0,0,0
data source : D:\APRF\RF\data\MWI\Precip\Derived\precip.tif
names : precip
min values : 587
max values : 2444
Folder: Roads
File Name: roads.shp
Source: Open Street Map, Downloaded 2013-08-08, http://extract.bbbike.org/
Description: These data were downloaded as part of a per-country package of data layers made available as shapefiles through the http://extract.bbbike.org website, extracted from the Open Street Map (OSM) database.
Class: linear
Derived Covariates:
prp, cls, dst,
class : SpatialLinesDataFrame
nfeatures : 5468
extent : 455069, 819084, 8095244, 8970795 (xmin, xmax, ymin, ymax)
coord. ref. : NA
nvariables : 7
Folder: Rivers
File Name: DEFAULT: hydro/watrcrsl
Source: National Geospatial-Intelligence Agency (NGA), http://geoengine.nga.mil/geospatial/SW_TOOLS/NIMAMUSE/webinter/rast_roam.html
Description: The VMAP0 data area downloaded as separate files, grouped roughly by continent, and merged into individual shapefiles for subsetting and further processing for population mapping efforts. These data were obtained directly from the original VMAP0 data sources provided by the NGA and pre-processed using Military Analyst in ArcGIS 10.0.
Class: linear
Derived Covariates:
dst,
class : SpatialLinesDataFrame
nfeatures : 1281
extent : 454510, 823998, 8095182, 8974649 (xmin, xmax, ymin, ymax)
coord. ref. : NA
nvariables : 9
Folder: Populated
File Name: DEFAULT: Merged pop/builtupp, pop/builtupa, pop/mispopp
Source: National Geospatial-Intelligence Agency (NGA), http://geoengine.nga.mil/geospatial/SW_TOOLS/NIMAMUSE/webinter/rast_roam.html
Description: The VMAP0 data area downloaded as separate files, grouped roughly by continent, and merged into individual shapefiles for subsetting and further processing for population mapping efforts. These data were obtained directly from the original VMAP0 data sources provided by the NGA and pre-processed using Military Analyst in ArcGIS 10.0. Point data sources are buffered to 100 m and then all polygon data sources are merged to a single shapefile prior to processing.
Class: polygon
Derived Covariates:
cls, dst, prp,
class : SpatialPolygonsDataFrame
nfeatures : 259
extent : 473944, 811168, 8109840, 8960583 (xmin, xmax, ymin, ymax)
coord. ref. : NA
nvariables : 12
Folder: Waterbodies
File Name: DEFAULT: hydro/watrcrsl
Source: National Geospatial-Intelligence Agency (NGA), http://geoengine.nga.mil/geospatial/SW_TOOLS/NIMAMUSE/webinter/rast_roam.html
Description: The VMAP0 data area downloaded as separate files, grouped roughly by continent, and merged into individual shapefiles for subsetting and further processing for population mapping efforts. These data were obtained directly from the original VMAP0 data sources provided by the NGA and pre-processed using Military Analyst in ArcGIS 10.0.
Class: polygon
Derived Covariates:
cls, dst, prp,
class : SpatialPolygonsDataFrame
nfeatures : 197
extent : 472639, 812967, 8120403, 8974660 (xmin, xmax, ymin, ymax)
coord. ref. : NA
nvariables : 10
Folder: Protected
File Name: DEFAULT: WDPAfgdb_Sept2012.gdb
Source: World Database on Protected Areas, Downloaded September, 2012, UNEP, http://www.wdpa.org, http://protectedplanet.net
Description: These data are compiled by UNEP and distributed via the Protected Planet website. All protected areas were downloaded regardless of International Union for Conservation of Nature (IUCN) or any other designation, so they include sanctuaries, national parks, game reserves, World Heritage Sites, etc.
Class: polygon
Derived Covariates:
cls, dst, prp,
class : SpatialPolygonsDataFrame
nfeatures : 74
extent : 459749, 809309, 8123312, 8949770 (xmin, xmax, ymin, ymax)
coord. ref. : NA
nvariables : 26
Folder: Urban
File Name: DEFAULT: schneider-urban.shp
Source: Schneider, et al., United Nations
Description: These data were constructed from MODIS-derived imagery and provided to WorldPop researchers by Schneider, et al. as part of a global urban extents datasets.
Class: polygon
Derived Covariates:
cls, dst, prp,
class : SpatialPolygonsDataFrame
nfeatures : 82
extent : 462857, 813537, 8161091, 8781378 (xmin, xmax, ymin, ymax)
coord. ref. : NA
nvariables : 2
Folder: Elevation
File Name: DEFAULT: Void-Filled DEM.gdb
Source: HydroSHEDS Void-Filled DEM (Lehnert, et al., 2006), http://hydrosheds.cr.usgs.gov/dataavail.php
Description: The HydroSHEDS data are the result of an effort to provide a globally consistent dataset consisting of NASA's Shuttle Radar Topography Mission (SRTM) data and have been processed, void-filled and corrected for use at large scales.
Class: raster
Derived Covariates:
, slope,
class : RasterBrick
dimensions : 8608, 3567, 30704736, 1 (nrow, ncol, ncell, nlayers)
resolution : 100, 100 (x, y)
extent : 463947, 820647, 8104139, 8964939 (xmin, xmax, ymin, ymax)
coord. ref. : +proj=utm +zone=36 +south +datum=WGS84 +units=m +no_defs +ellps=WGS84 +towgs84=0,0,0
data source : D:\APRF\RF\data\MWI\Elevation\Derived\elevation.tif
names : elevation
min values : 30
max values : 2968
Folder: Health
File Name: HFs.shp
Source: Malawi National Statistics Office, http://www.nsomalawi.mw
Description: These data were downloaded from https://cod.humanitarianresponse.info/search/field_country_region/143?search_api_views_fulltext= and updated with some additional entries from the National Statistics Office (NSO).
Class: point
Derived Covariates:
prp, cls, dst,
class : SpatialPointsDataFrame
nfeatures : 1665
extent : 475820, 808425, 8106770, 8963086 (xmin, xmax, ymin, ymax)
coord. ref. : NA
nvariables : 43
Folder: Buildings
File Name: buildings.shp
Source: Open Street Map, Downloaded 2013-08-08, http://extract.bbbike.org/
Description: These data were downloaded as part of a per-country package of data layers made available as shapefiles through the http://extract.bbbike.org website, extracted from the Open Street Map (OSM) database.
Class: polygon
Derived Covariates:
prp, cls, dst,
class : SpatialPolygonsDataFrame
nfeatures : 212
extent : 563498, 733738, 8179228, 8736684 (xmin, xmax, ymin, ymax)
coord. ref. : NA
nvariables : 3
Folder: Natural
File Name: natural.shp
Source: Open Street Map, Downloaded 2013-08-08, http://extract.bbbike.org/
Description: These data were downloaded as part of a per-country package of data layers made available as shapefiles through the http://extract.bbbike.org website, extracted from the Open Street Map (OSM) database.
Class: polygon
Derived Covariates:
prp, cls, dst,
class : SpatialPolygonsDataFrame
nfeatures : 839
extent : 465729, 813439, 8160423, 8961817 (xmin, xmax, ymin, ymax)
coord. ref. : NA
nvariables : 3
Folder: Places
File Name: places.shp
Source: Open Street Map, Downloaded 2013-08-08, http://extract.bbbike.org/
Description: These data were downloaded as part of a per-country package of data layers made available as shapefiles through the http://extract.bbbike.org website, extracted from the Open Street Map (OSM) database.
Class: point
Derived Covariates:
prp, cls, dst,
class : SpatialPointsDataFrame
nfeatures : 880
extent : 462057, 811156, 8105931, 8969343 (xmin, xmax, ymin, ymax)
coord. ref. : NA
nvariables : 4
Folder: Points
File Name: points.shp
Source: Open Street Map, Downloaded 2013-08-08, http://extract.bbbike.org/
Description: These data were downloaded as part of a per-country package of data layers made available as shapefiles through the http://extract.bbbike.org website, extracted from the Open Street Map (OSM) database.
Class: point
Derived Covariates:
prp, cls, dst,
class : SpatialPointsDataFrame
nfeatures : 632
extent : 457792, 810998, 8158355, 8901502 (xmin, xmax, ymin, ymax)
coord. ref. : NA
nvariables : 4
Folder: Railways
File Name: railways.shp
Source: Open Street Map, Downloaded 2013-08-08, http://extract.bbbike.org/
Description: These data were downloaded as part of a per-country package of data layers made available as shapefiles through the http://extract.bbbike.org website, extracted from the Open Street Map (OSM) database.
Class: linear
Derived Covariates:
prp, cls, dst,
class : SpatialLinesDataFrame
nfeatures : 57
extent : 462472, 819074, 8095784, 8488688 (xmin, xmax, ymin, ymax)
coord. ref. : NA
nvariables : 3
Folder: Wtrways
File Name: waterways.shp
Source: Open Street Map, Downloaded 2013-08-08, http://extract.bbbike.org/
Description: These data were downloaded as part of a per-country package of data layers made available as shapefiles through the http://extract.bbbike.org website, extracted from the Open Street Map (OSM) database.
Class: linear
Derived Covariates:
prp, cls, dst,
class : SpatialLinesDataFrame
nfeatures : 841
extent : 463654, 807770, 8095191, 8961909 (xmin, xmax, ymin, ymax)
coord. ref. : NA
nvariables : 4
Folder: Uses
File Name: landuse.shp
Source: Open Street Map, Downloaded 2013-08-08, http://extract.bbbike.org/
Description: These data were downloaded as part of a per-country package of data layers made available as shapefiles through the http://extract.bbbike.org website, extracted from the Open Street Map (OSM) database.
Class: polygon
Derived Covariates:
prp, cls, dst,
class : SpatialPolygonsDataFrame
nfeatures : 353
extent : 457341, 798238, 8148674, 8953087 (xmin, xmax, ymin, ymax)
coord. ref. : NA
nvariables : 3
