Changes between Version 2 and Version 3 of EwEugBasemap


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Timestamp:
2010-11-24 00:51:01 (9 years ago)
Author:
shermanl
Comment:

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  • EwEugBasemap

    v2 v3  
    1 10.4 Basemap 
     1== 10.4 Basemap == 
    22 
    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. 
     3The 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. 
    44 
    55Before 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). 
    66 
    7 The distinction between land and water areas is crucial to the definition of the basemap. This distinction determines the maps 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. 
     7The 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. 
    88 
    99See ''Considerations for building the basemap'' below for a short list of issues to consider when building the basemap. 
     
    1717[[Image(wiki:EwEugImages:Habitat.png)]] '''Edit habitats''' 
    1818 
    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. 
    2020 
    2121[[Image(wiki:EwEugImages:MPA.png)]] '''Edit MPAs''' 
     
    2525[[Image(wiki:EwEugImages:Regions.png)]] '''Edit regions''' 
    2626 
    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. 
     27Users 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. 
    2828 
    2929'''2. Sketching the basemap''' 
     
    4949It is recommended that you begin by sketching the land cells. 
    5050 
    51 The distinction between land and water areas is crucial to the definition of the basemap. This distinction determines the maps 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. 
     51The 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. 
    5252 
    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. 
     53Though 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. 
    5454 
    5555'''Habitats''' 
     
    5757Every water cell in the basemap needs to be assigned as a habitat. 
    5858 
    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…). 
     59Typically, the features defining habitats are distance from the coast (inshore, offshore...), or depth (shallow, intermediate, deep...) and/or bottom type (rocky, sandy, muddy...). 
    6060 
    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. 
     61Note 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. 
    6262 
    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’. 
     63The 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'. 
    6464 
    6565'''MPAs''' 
     
    9797'''3. Considerations for building the basemap''' 
    9898 
    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). 
    100100 
    101101 * 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. 
    102102 
    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). 
    104104 
    105105 * Restricted or protected areas (R/PAs) may consist of one or several cells, adjacent or not, and may touch upon a coastline, or not. 
    106106 
    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. *