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GIS in fisheries management Malta, 12 - 15 March 2001
1
EXERCISE : Analysis of an Analog Map with a GIS Point of View (Acknowledgement to Mariano Vicente Albaladejo author of the map)
GIS in fisheries management Malta, 12 - 15 March 2001
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The map supplied is an Example of a GIS application in the field of littoral management. This project was aimed to the search for a good location for aquaculture cages. Several criteria imposed by different authorities had to be observed. The sheet is the final map showing the areas that satisfy all the conditions. Exercise: Answer the following question looking at the map supplied. Map Title: ___________________________________________________________ ___________________________________________________________ Map Extent:
Latitude: from ___º___'___''___ * to ___º___'___''___ *
Longitude from ___º___'___''___ * to ___º___'___''___ * * N : North S : South E: East W : West Convert Map extent coordinates to decimal degrees :
Latitude Minimum: _______
Latitude Maximum: _______
Longitude Minimum: _______
Longitude Maximum: _______
Map Scale: 1cm on the Map represents _________ km in the real World Calculate the surface of the "zona de reserva" in km2 : ________ km2 Projection: 1 Minute of longitude = ______ km 1 Minute of latitude = _____km Do you think that this map uses a projection?
GIS in fisheries management Malta, 12 - 15 March 2001
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How many layers of information do you think have been used?. Describe the different Information Layers :
Attribute Type of spatial object(points, lines or
polygons)
Number of classes
Classes description
GIS in fisheries management Malta, 12 - 15 March 2001
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What differences do you find between the land area and the rest of layers? What kind of spatial operation do you think has been necessary to obtain the green area? Position: What is at 6 Km West from Isla del Barón? Condition: What is the area shallower than 50 m occupied by artificial reefs?
GIS in fisheries management Malta, 12 - 15 March 2001
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EXERCISE CORRECTION: Analysis of an Analog Map with a GIS Point of View (Acknowledgement to Mariano Vicente Albaladejo author of the map) The map supplied is an Example of a GIS application in the field of littoral management. This project was aimed to the search for a good location for aquaculture cages. Several criteria imposed by different authorities had to be observed. The sheet is the final map showing the areas that satisfy all the conditions. Exercise: Answer the following question looking at the map supplied. Map Title: Ponencia técnica sobre acuicultura en la regi'on de Murcia
Mapa de Síntesis SectorIII. Cabo de Palos-El Mojón
Map Extent:
Latitude: from 37º37'00''N to 37º51'00''N Longitude from 0º58'00''W to 0º33'00''W * N : North S : South E: East W : West Convert Map extent coordinates to decimal degrees :
Latitude Minimum: 37 + 37/60 = 37.61º
Latitude Maximum: 37 + 51/60 = 37.85º
Longitude Minimum: 0+ 58/60 = - 0.96º
Longitude Maximum: 0+ 33/60 = - 0.55º Map Scale: 1cm on the Map represents 1 km in the real World Calculate the surface of the "zona de reserva" in km2 : 2.7 * 7.4 = 20 km2 Projection: 1 Minute of longitude = 1.45 km 1 Minute of latitude = 1.85 km Do you think that this map uses a projection? Yes, the fact that the distances are different in different directions, tells us that a projection has been used.
GIS in fisheries management Malta, 12 - 15 March 2001
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How many layers of information do you think have been used?. 10 according to the classification described in the table below. Describe the different Information Layers :
Attribute Type of spatial object (points, lines or
polygons)
Number of classes
Classes description
Instalaciones de Acuicultura
Polygons 3 - Concesion en tramite
- Autorizacion temporal
- Concesion en vigor
Isobatas maestras Lines 5 Linea de costa, 30, 50 ,100 y 200m
Hidrografia Lines 1 Ríos Red viaria Lines 1 Carreteras Límite de Término Municipal
Lines 1 Término Municipal
Area de estudio Polygons 7 -Adecuado -Adecuado con objeciones -No adeciuado -No compatible -Zona excluida -Terreno emergido -Fuera de zona de estudio > de 100 m
Aptitud para instalaciones de acuicultura
Polygons 3 -Apta -A estudiar -No apta
Hundimiento Points 1 Hundimiento Usos de la zona costera
Polygons 4 -Puerto -Zona de reserva -Arrecife artificial -Fondeadero
Núcleos de población Polygons 1 Núcleos de población
GIS in fisheries management Malta, 12 - 15 March 2001
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What differences do you find between the land area and the rest of layers?. From the different symbology used, one can appreciate that this polygon is the representation a three D surface showing topography. It is the result of a raster image transformation with the aim to better visualize relief. What kind of spatial operation do you think has been necessary to obtain the green area?. Overlay of different layers, spatial searchs, Intersections, clips, etc.. Position: What is at 6 Km West from Isla del Barón? Los Urrutias Condition: What is the area shallower than 35 m not occupied by artificial reefs? The dark blue areas except in the southern the part not occupied by red strips.