Changes between Version 2 and Version 3 of EwEugBasemap
- Timestamp:
- 2010-11-24 00:51:01 (13 years ago)
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EwEugBasemap
v2 v3 1 10.4 Basemap 1 == 10.4 Basemap == 2 2 3 The basemap is used to mediate between an Ecopath file - which assumes an homogenous distribution of the biomasses in an undefined space –and a real ecosystem with geographic features (land vs water, bathymetry, etc.) impacting on the distribution of the biomasses in that file.3 The basemap is used to mediate between an Ecopath file - which assumes an homogenous distribution of the biomasses in an undefined space - and a real ecosystem with geographic features (land vs water, bathymetry, etc.) impacting on the distribution of the biomasses in that file. 4 4 5 5 Before sketching your basemap you must first set the dimensions of the map using the ''Edit basemap'' dialogue box (see below). You must also set the number of habitats and any marine protected areas and regions (see ''Edit habitats...'', ''Edit MPAs...'' and ''Edit regions...'' below). 6 6 7 The distinction between land and water areas is crucial to the definition of the basemap. This distinction determines the map ’s overall appearance (i.e., its resemblance to a geographic map) and, in case of detailed maps, the routes through which organisms move between adjacent cells.7 The distinction between land and water areas is crucial to the definition of the basemap. This distinction determines the map's overall appearance (i.e., its resemblance to a geographic map) and, in case of detailed maps, the routes through which organisms move between adjacent cells. 8 8 9 9 See ''Considerations for building the basemap'' below for a short list of issues to consider when building the basemap. … … 17 17 [[Image(wiki:EwEugImages:Habitat.png)]] '''Edit habitats''' 18 18 19 ‘Habitats’, in Ecospace, are sets of (water) cells sharing certain features affecting the movements, feeding rate, and survival of the Ecopath model components occurring therein. The names and number of habitats are set using the ''Edit habitats'' dialogue box, available by clicking on the ../Resources/Images/Habitat.png icon at the top right of the ''Basemap'' form. The dialogue box can also be opened from the ''Ecospace menu''. See [wiki:EwEugDefineEcospaceHabitats Define Ecospace habitats] for help with this dialogue box.19 'Habitats', in Ecospace, are sets of (water) cells sharing certain features affecting the movements, feeding rate, and survival of the Ecopath model components occurring therein. The names and number of habitats are set using the ''Edit habitats'' dialogue box, available by clicking on the ../Resources/Images/Habitat.png icon at the top right of the ''Basemap'' form. The dialogue box can also be opened from the ''Ecospace menu''. See [wiki:EwEugDefineEcospaceHabitats Define Ecospace habitats] for help with this dialogue box. 20 20 21 21 [[Image(wiki:EwEugImages:MPA.png)]] '''Edit MPAs''' … … 25 25 [[Image(wiki:EwEugImages:Regions.png)]] '''Edit regions''' 26 26 27 Users can also overlay habitats with statistical ‘regions’(i.e., groups of cells). Regions represent areas of management interest and may or may not have biological significance. Organisms cannot be assigned to regions, only habitats. The names and number of regions are set using the ''Edit regions'' dialogue box, available by clicking on the [[Image(wiki:EwEugImages:Regions.png)]] icon at the top right of the ''Basemap'' form. The dialogue box can also be opened from the ''Ecospace menu''. See [wiki:EwEugDefineEcospaceHabitats Define Ecospace habitats] for help with this dialogue box.27 Users can also overlay habitats with statistical 'regions' (i.e., groups of cells). Regions represent areas of management interest and may or may not have biological significance. Organisms cannot be assigned to regions, only habitats. The names and number of regions are set using the ''Edit regions'' dialogue box, available by clicking on the [[Image(wiki:EwEugImages:Regions.png)]] icon at the top right of the ''Basemap'' form. The dialogue box can also be opened from the ''Ecospace menu''. See [wiki:EwEugDefineEcospaceHabitats Define Ecospace habitats] for help with this dialogue box. 28 28 29 29 '''2. Sketching the basemap''' … … 49 49 It is recommended that you begin by sketching the land cells. 50 50 51 The distinction between land and water areas is crucial to the definition of the basemap. This distinction determines the map ’s overall appearance (i.e., its resemblance to a geographic map) and, in case of detailed maps, the routes through which organisms move between adjacent cells. Note that movements on the Ecospace map can only resemble those of rooks on chessboards, but not those of bishops (i.e., sideways not diagonal movement). Thus, a system including, e.g., a number of narrow, crooked channels must be simplified.51 The distinction between land and water areas is crucial to the definition of the basemap. This distinction determines the map's overall appearance (i.e., its resemblance to a geographic map) and, in case of detailed maps, the routes through which organisms move between adjacent cells. Note that movements on the Ecospace map can only resemble those of rooks on chessboards, but not those of bishops (i.e., sideways not diagonal movement). Thus, a system including, e.g., a number of narrow, crooked channels must be simplified. 52 52 53 Though not contributing to the results, the basemap cells defined as ‘land’consume memory and computing time. Their number should therefore be kept as small as possible, e.g., by orienting the basemap sideways where appropriate.53 Though not contributing to the results, the basemap cells defined as 'land' consume memory and computing time. Their number should therefore be kept as small as possible, e.g., by orienting the basemap sideways where appropriate. 54 54 55 55 '''Habitats''' … … 57 57 Every water cell in the basemap needs to be assigned as a habitat. 58 58 59 Typically, the features defining habitats are distance from the coast (inshore, offshore …), or depth (shallow, intermediate, deep…) and/or bottom type (rocky, sandy, muddy…).59 Typically, the features defining habitats are distance from the coast (inshore, offshore...), or depth (shallow, intermediate, deep...) and/or bottom type (rocky, sandy, muddy...). 60 60 61 Note that definition of habitat in Ecospace usually includes the entire water column, from the surface to the bottom. Thus, while ‘rockfishes’ will tend to be limited to hard bottoms, and burrowing bivalves to soft bottoms, small coastal pelagics, which occur higher up in the water column, may ‘prefer’ hard and soft bottom habitats, as long as both are coastal.Assign habitat preferences of the models's groups using the [wiki:EwEugAssignHabitats Assign habitats] form.61 Note that definition of habitat in Ecospace usually includes the entire water column, from the surface to the bottom. Thus, while 'rockfishes' will tend to be limited to hard bottoms, and burrowing bivalves to soft bottoms, small coastal pelagics, which occur higher up in the water column, may 'prefer' hard and soft bottom habitats, as long as both are coastal. Assign habitat preferences of the models's groups using the [wiki:EwEugAssignHabitats Assign habitats] form. 62 62 63 The basemap may include open borders, i.e., water areas not bounded by land. In such cases, the flow of organisms out of a border cell is compensated for by an equal flow of organisms into the cell, i.e., the system will not ‘leak’.63 The basemap may include open borders, i.e., water areas not bounded by land. In such cases, the flow of organisms out of a border cell is compensated for by an equal flow of organisms into the cell, i.e., the system will not 'leak'. 64 64 65 65 '''MPAs''' … … 97 97 '''3. Considerations for building the basemap''' 98 98 99 * The cells are square units, but the maps not need be so, both square and rectangular maps can be accommodated. Rectangular maps should not be defined too ‘thin’, (i.e., their aspect ratio (AR = height/width) is recommended to remain in the range 5 £ AR £ 0.2).99 * The cells are square units, but the maps not need be so, both square and rectangular maps can be accommodated. Rectangular maps should not be defined too 'thin', (i.e., their aspect ratio (AR = height/width) is recommended to remain in the range 5 £ AR £ 0.2). 100 100 101 101 * The number of cells in the basemap may range from 4 (for a square 2x2 map, used e.g. for verification or demonstration purposes) to 10,000, (e.g., for a square 100 x 100 map). We recommend, unless otherwise required, the intermediate 20 x 20 map provided as default, which represents a compromise between showing details and maintaining a high computing speed. 102 102 103 * Protected areas are defined as set of cells in which no fleet is permitted to operate(although ‘cheating’, wherein one or several fleets illegally operate inside a protected area, can be accommodated by Ecospace).103 * Protected areas are defined as set of cells in which no fleet is permitted to operate(although 'cheating', wherein one or several fleets illegally operate inside a protected area, can be accommodated by Ecospace). 104 104 105 105 * Restricted or protected areas (R/PAs) may consist of one or several cells, adjacent or not, and may touch upon a coastline, or not. 106 106 107 * Note that for a number of theoretical and practical reasons, marine protected areas (MPAs) and other forms of R/PAs are more effective when they have as few cells as possible that are adjacent to exploited cells. This can be achieved by making the R/PA as compact as possible (i.e., ‘round’or square rather than elongated), and locating it adjacent to a coastline. *107 * Note that for a number of theoretical and practical reasons, marine protected areas (MPAs) and other forms of R/PAs are more effective when they have as few cells as possible that are adjacent to exploited cells. This can be achieved by making the R/PA as compact as possible (i.e., 'round' or square rather than elongated), and locating it adjacent to a coastline. *
