Exercise: Analysis of an analog map with a GIS point of ...

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)


2

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?


3

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


4

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?


1

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.


2

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


3

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.

Exercise: Analysis of an analog map with a GIS point of ...

Documents