![]() ![]() Quality, can really "dominate" the wall it is mounted on. This professionally printed poster, on account of its sheer size and print Inks, on heavy 250g Satin-finish Epson Archival paper (actual image The image is reproduced in Hi-Res, giclée printed in an impressiveġ3"x19" (330x483mm) size, using non-fade museum quality pigment PRINTED ON EXTRA-LARGE 250g SATIN ARCHIVAL EPSON PAPER (*) To judge, see magnified image 2 above, for detail). The trans-Atlantic voyage, serving the Slavery Trade in the Vintage Map displaying the plethora of sailing Ports for Ultra High-Resolution(*) Reproduction Print, from a rare The steps to produce travel time surfaces are: rasterization of transportation network vector layers, grid aggregation (cell statistics) into a single time/cost layer, and computation of a cumulative time/cost layer from start point or points.The Map of ShWest Africa Map, Slave-Trade Ports. Major river navigation is included in Ghana using Horton–Strahler number to theoretically define navigable river segments (River Volta). Lake and river navigation are treated as a surface (polygons) not taking into consideration navigation infrastructure (points) Ĭ. Road travel time/cost is computed for large trucks only, it is assumed that the accessibility is related to large cargo freight vehicles, tertiary and local traffic roads are not included ī. The calculation of cost/time distance surfaces is based on some assumptions:Ī. The map was produced under the scope of the sub-Saharan African Corridor, mobile storage (movable warehouse) location pilot project. ![]() The raster pixel cell in the final areas are classified into the final location map.Īccessibility: Travel Time-Cost to Major Maritime Ports (Ghana - ~1km) is a travel time/cost surface (raster grid), produced for Ghana's Takoradi and Tema Ports.Ĝlip Raster by Mask Layer - Extracts the raster-production aggregate location score using the polygon obtained by the dissolved intersection of the banks and roads buffers.ĝissolve - Takes the intersection vector layer and combines the features into a new feature, a single polygon.Intersection - extracts the overlapping portions of Banks_Buffer and Roads_Buffer.O Major roads - 2km (0.18 degree) buffer radius Oěanks - 10km (0.09 degree) buffer radius This output step filters the location score grid (aggregated production) into a top location score raster. The Top Score Locations were computed using the Location Score raster and adding as criteria, access to finance (distance to bank agency) and linear distance from major roads. ("Crop Production" * 0.4) + ("Human Population Density" * 0.3) + ("Cumulative Travel Time/Cost" * 0.3)Ĭrop Storage Final Location: Aggregated Production (Kenya - ~1km) consists of a 0.01 decimal degree grid produced under the scope of the Covid-19 sub-Saharan African Corridor project pilot case, using a Geographical Information Systems - Multicriteria Decision Analysis (GIS-MCDA) methodology for the identification and definition of mobile storage locations (movable warehouses). The assumed weight for each of the criteria is as follows. The location score is obtained by way of a simple arithmetic weighted sum calculation (raster calculator tool) of reclassified grids, generating a location score varying from 0 to 3. GIS multicriteria decision analysis GIS-MCDA consists of a method to convert and combine spatial data/geographical information and decision-makers criteria in order to attain evidence for a decision-making process. The main transportation network infrastructure is the input for the development of a raster-based travel time/cost analysis. These variables are major crops (supply), human population density (demand) and main transportation network infrastructure (accessibility). The modeling variables characterize supply, demand and accessibility, main logistical factors for warehousing facilities location. Raster grid covering the country with 0.01 decimal degrees resolution produced under the scope of the sub-Saharan African Corridor project pilot case, using raster-based Geographical Information Systems - Multicriteria Decision Analysis (GIS-MCDA) methodology for the identification and definition of mobile storage locations (movable warehouses). ![]()
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