qdgc Angola

QDGC tables delivered in geopackage file(s)
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QDGC represents a way of making (almost) equal area squares covering a
specific area to represent specific qualities of the area covered. The
squares themselves are based on the degree squares covering earth. Around
the equator we have 360 longitudinal lines , and from the north to the
south pole we have 180 latitudinal lines. Together this gives us 64800
segments or tiles covering earth.


The geopackage file(s) provided are named by country and zipped. Examples are:
-qdgc_zambia.zip
-qdgc_tanzania.zip
-qdgc_ghana.zip
-etc


Within each geopackage file you will find a number of tables with these names:


-tbl_qdgc_01
-tbl_qdgc_02
-tbl_qdgc_03
-tbl_qdgc_04
-tbl_qdgc_05
-etc


The attributes for each table are:


qdgc Unique Quarter Degree Grid Cell reference string
area_reference Country
level_qdgc QDGC level
cellsize degrees decimal degree for the longitudal and latitudal length of the cell
lon_center Longitude center of the cell
lat_center Latitudal center of the cell
area_km2 Calculated area for the cell
geom Geometry


Metadata
--------
Geodata GCS_WGS_1984
Datum: D_WGS_1984
Prime Meridian: 0


Area was calculated with PostgIS function st_area:
- (st_area(st_transform(geom, 102008))/1000000)




Licensing
---------
Creative Commons Attribution 4.0 International




Conditions
----------
Delivered to the user as-is. No guarantees. If you find errors, please tell
and I will try to fix it.




Thankyou
--------


Tanzania Wildlife Research Institute
Dept of Biology, NTNU, Norway
Norwegian Environment Agency
Eivin Røskaft
Steven Prager
Howard Frederick
Julian Blanc
Honori Maliti
Paul Ramsey




References
----------
* http://en.wikipedia.org/wiki/QDGC
* http://www.mindland.com/wp/projects/quarter-degree-grid-cells/about-qdgc/
* http://en.wikipedia.org/wiki/Lambert_azimuthal_equal-area_projection
* http://www.safe.com




Regards,


Ragnvald Larsen
Trondheim 16th of January, 2021


ragnvald@mindland.com
www.mindland.com