APPENDIX A. LOE SUMMARY ESTIMATES FOR DCW/VMAP0 PROCESSING

Table A
Estimated LOE for processing individual DCW and VMap0 layers for a single continental landmass or region

Layer Name/Reference	Source	LOE in Days¹	Number of Features¹	Description of Required Processing Tasks
DIGITAL CHART OF THE WORLD COMPONENT DATABASE LAYERS
Map Annotation Layers	DCW	3.0	~26 278 map labels for ~10 feature types	Consolidated annotation coverage of ALL map labels associated either graphic primitives or indistinct feature types on ONC source maps
Point SWB Features	DCW/VMap0	1.5	13 112	Harmonized derivative of dams, lakes, waterholes, wells and other SWBs based on the VMap0-MP & DCW-DNPNT & DSPNT data sources
Point SWB Annotation	DCW	0.5	~800 lakes, and ~1600 dams or wells	Enhanced derivative based on annotation layers of DCW DNNET & DNPNT sources
Drainage Network Annotation	DCW	0.5	~3 900	Subset annotation & create point features from DCW-DNNET annotation layer
Land Cover, with Undifferentiated Wetlands	DCW	3.0	5 332 total 2 800 wetland	Salt Pans, Rice & Cultivated Areas, Inundated Lands & major Wetlands dropped during the migration from the DCW to VPF data standards
Land Surface Features	DCW	3.0	7 682	Land cover surfaces, a subset of the DCW LCPOLY layer,similar to AF_GA below
Relief Shading	DCW	1.0	6 regions in ~21 456 polys	Regions of hypsographic relief as depicted on ONC source charts
DCW Gazetteer Compilation	NIMA-DCW	0.2	21 023	Stock DCW gazetteer converted into Shapefile format. Data are based on the map labels associated either graphic primitives or indistinct feature types on the ONC source maps.
VECTOR SMART MAP LEVEL-0 COMPONENT DATABASE LAYERS
Airports	VMap0	0.5	1 065	Airports from TRANS data library
Canals	VMap0/DCW	0.7	241	Consolidated canals from VMap0 & DCW source HYDRO datalibrary
Capital Cities Point	VMap0	0.2	55	Create capital cities as point features from populated place feature layers.
Capital Cities Polygon	VMap0	0.7	13	Derive capitals cities polygon layer, creating cities not represented in PPLPY as polygons.
Contours, Coastlines, & Bathymetric lines	VMap0	7.0	108 715	Consolidate & review contour & bathymetry, integrating coastline arc features as zero elevation.
Linear Dams	VMap0	0.2	6	Large dams from the HYDRO datalibrary
Navigation Hazards	VMap0	0.2	236	Off-shore danger points, HYDRO library
Spot Elevation Points	VMap0	4.0	80 449	Spot elevations from ELEV datalibrary, confirm contour features represented as points
Hydro-Inland Water bodies	VMap0	5.0	16 091	Seamless processing and encoding consolidation of SWBs polygons and linear outlines based on VMap0-IW
Hydro-Rivers	VMap0/DCW	5.0	136 862	Perennial/non-perennial Rivers from VMap0-IW, with any gaps filled by DCW- DNNET & possibly ESRI’s on-line resources
Hydrological Network	VMap0/DCW	2.0	28 437	Integration of Rivers and SWB outlines
Point Island Features	VMap0	0.5	1 527	Pelagic islands from political BND library
Continental General Reference	VMap0	0.5	3 541	Major roads, coastlines & AD1 boundaries from specific library reference data library (lines)
Land/Sea Ice	VMap0	0.3	~27	Glacier and terrestrial Ice Ridges and Sea Ice
Miscellaneous Linear Features	VMap0	0.2	10	Aerial cableways, etc. from TRANS data library
Oceans/Seas	VMap0	2.0	25	Oceans & Seas from BND data library (polygon)
Source ONC Chart Boundaries & Data Quality	VMap0	0.2	63	Source ONC Charts from DQ datalibrary
Other VMap0 Layers not specified in Table	VMap0	4.5	N/A	Any other data layers from the various topical indexes of the VMap0 Library not specified in thistable
Physiography	VMap0	3.0	7 047	Re-encoded & edit physiographic features from PHYS data library, similar to DCW LCPOLY.
Detailed Political Boundaries	VMap0	5.0	1 156	Detailed AD1& AD2 boundaries with pelagic islands (polygon)
Generalized Boundaries	VMap0	0.5	49	Basic continental AD1 political boundaries (polygon)
Populated Place Point	VMap0	1.0	13 344 named 25 833 contextual	Re-encoded continental derivative of VMap0 populated place data layer.
Populated Place Polygon	VMap0	2.0	3 800	Urban and Peri-Urban areas from the POP library
Primary and Secondary Roads	VMap0	1.5	58 771	Roads from the TRANS data library
Railway Lines	VMap0	0.5	7 980	Railroads from the TRAN data library
Railway Yards	VMap0	0.2	80	Railway yards from the TRANS library
Tertiary Roads	VMap0	1.5	17 416	Tertiary roads from the TRANS library
Linear Transport Infrastructure	VMap0	0.2	475	Linear transport infrastructure features, i.e. bridges
Point Transport Infrastructure	VMap0	0.2	77	Point transport infrastructure features
VMap0 Library Reference	VMap0	0.1	4	CD/Database reference for VMap0 (polygon)
Vegetation	VMap0	3.0	N/A	Integration of Crop, Grass, Swamp, Tree, and Tundra land layers from VEG index library
World General Reference	VMap0	0.5	20 453	Generalized roads, coastlines & AD1 boundaries from overall reference data library (linear)
World Political Boundaries	VMap0	1.5	207	Generalized world polygonal political boundaries

¹ 1Number of representative features and LOE estimates based on processing for the FAO-African Water Resources Database Terminology: ANNO (map annotation labels); DCW (Digital Chart of the World); N/A (Not Available); NGA (U.S. National Geospatial Agency); ONC (Operational Navigation Charts, i.e. the primary map source for the DCW/VMap0); AD (Administrative data layer); VMap0 (Vector Map Level 0)