qdgc Angola
QDGC tables delivered in geopackage file(s) - - - - - - - - - - - - - - - - - - - - - - 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. Aro...
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| Format: | Dataset |
| Language: | unknown |
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2021
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| Online Access: | https://zenodo.org/record/4449291 https://doi.org/10.5281/zenodo.4449291 |
| Summary: | QDGC tables delivered in geopackage file(s) - - - - - - - - - - - - - - - - - - - - - - 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 |
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