This content shows geospatial data sources for Japan and global data, coordinate reference system, and create a map of population density (Vector analysis: dissolve vector, join table, calculate area and population density.
7. • DIVA-GIS provides free geographic data such as administrative areas,
inland water, roads, railroads, elevation and land cover
• http://www.diva-gis.org/gdata Subject Description Source Format
Resolutio
n
Administrative
areas
(boundaries)
Country outlines and administrative subdivisions
for all countries. The level of subdivision varies
between countries
GADM, version 1.0
Vector
(area)
-
Inland water
Rivers, canals, and lakes. Seperate files for line
and area features
Digital Chart of the
World
Vector
(line and
area)
-
Roads Roads
Digital Chart of the
World
Vector
(line)
-
Railroads Railroads
Digital Chart of the
World
Vector
(line)
-
Elevation
SRTM30 dataset. CGIAR-SRTM data
aggregated to 30 seconds
CGIAR SRTM (3
seconds resolution)
Grid
30
seconds
Land cover
Land cover, original data resampled onto a 30
seconds grid
GLC2000 Grid
30
seconds
Population Population density (old)
CIESIN, 2000. Global
gridded population
database
Grid
30
seconds
Climate Monthly climate data WorldClim Grid
30
seconds
Gazetteer
A gazetteer is a list of place names and their
coordinates. The files you can download here
are for use in DIVA for automatic georeferencing
(to assign coordinates to places). The files
should be placed in the gazet directory. (old,
use Biogeomancer). They can also be used to
map localities, however you can download more
recent files from NIMA
U.S. National
Imagery and
Mapping Agency's
(NIMA) database
of foreign geographic
feature names
DBF -
Global shapefile
8. • Global Map Japan was developed by Geospatial Information Authority of
Japan(GSI).
• Download: http://www.gsi.go.jp/kankyochiri/gm_japan_e.html
Japan shapefile
10. World :
• Country boundary ( ne_50m_admin_0_countries.shp ) (Vector)
• Global land-use ( gm_lc_v1.tif ) (Raster)
Japan :
• Japan shapefile ( polbnda_jpn.shp )
Stats :
• Population.csv
Input data for this workshop
Data: http://bit.do/workshop-yu
11. Open QGIS and check their coordinate systems
- Vector – world countries boundary
- Raster – MODIS temperature or global landuse
WGS84 EPSG:4326
Check coordinate systems
12. World Azimuthal Equidistant EPSG:54032
Sphere_Eckert_IV EPSG:53012
ETRS89 / EPSG Arctic zone 2-22 EPSG:6069
Data source CRS Project CRS
“On the fly” reprojection
Coordinate Reference System ( CRS )
13. • World Azimuthal Equidistant EPSG:54032
Let’s check each different CRS
21. • Dissolve
Takes a vector layer and combines its features into new features. One or
more attributes can be specified to dissolve features belonging to the same
class (having the same value for the specified attributes), alternatively all
features can be dissolved into a single one.
Dissolve function
25. Please check other useful
- Buffer
- Union
- Eliminate
https://docs.qgis.org/3.4/en/docs/user_manual/processing_algs/qgis/vectoroverlay.html#qgissymmetricaldifference
Other processing
35. • First export joined table shapefile
Edit attribute table
36. • Select the shapefile that you want to edit table
• Allow toggle editing
• Right check on that shapefile and open attribute table
• Directly type some loss values (Okinawa row) and save change
Edit attribute table
