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General map, fires 2017
General map, fires 2017
A total of 11411 Ha were burned in the Alto Minho area according to CIM Alto Minho data. The map on the left shows the location.
We can appreciate that 4 municipalities suffered fires, the most affected being Monção municipality with over 3876ha, followed by Melgaço with around 2398ha, Arcos de Valdevez with over 2163ha and Ponte da Barca (1321ha).
‣ Most affected month 2017: October
‣ Most affected month 2017: October
Taking as reference the data of EFFIS, since they are those used by the ICNF, it is observed that approximately 57.71% of the surface burned in the month of October.
‣ Most affected municipality: Monçao
‣ Most affected municipality: Monçao
Regarding the most affected geographical areas are the municipality of Monçao as the one that has suffered the greatest impact in terms of burned surface (even if it appears a different size depending on the data source) followed by Melgaço.
‣ Most affected surface: bushes
‣ Most affected surface: bushes
The bushes represent more than 49% of the burned surface, followed by forests with over 42%. With a lower degree of affectation would be the agricultural land with approximately 5%.
‣ Most affected forest specie
‣ Most affected forest specie
The most affected areas in forests, pinheiro bravo, over 58% of the affected territory was occupied with these species.
Fires October 2017
Fires October 2017
In order to deepen the analysis of the fires that caused the largest number of burned hectares, we focus on those caused during October 2017.
The following map is the distribution of forest fires that took place last October in the Alto Minho area. This map is drawn from the data available on the ICNF website.
The table shows the burned surface (in Ha) according to data obtained from EFFIS. A total of 6,586 Ha were affected.
Taking as reference the data of EFFIS, since they are those used by the ICNF, it is observed that approximately 57.71% of the surface burned in the month of October.
Regarding the most affected geographical areas are the municipality of Monçao, as the one that has suffered the greatest impact in terms of burned surface, followed by Melgaço.
How do we get to these results?
How do we get to these results?
The raster calculator is a simple geoprocessing tool, just subtracting the values from each layer to give another layer. In our case it is simple: we subtract the first return that is the treetops, with the base layer (the floor), with which we can create our data, the difference between both layers.
As a next step, we should add the burned area to know the location and affected areas. We have placed the points by species to be able to collect the heights of each of the points.
In order to know the height of each of the points that we have selected, we have to transfer the data of the height difference raster to our chosen points. Thanks to this we can know an average of the heights for each of the species.
In this final image the points of different color are shown depending on the species and as each of the points has a label with the height that we have previously introduced.
The next characteristic that we need to be able to calculate the biomass of each of the species is to know the approximate density of each species per hectare. In our case, as we know the average height of the species (calculated in the previous section), we can collect only the values that exceed the average height of each of the species. So we can cut the layer in the height measured by species and know only the treetops.
Finally, we obtain a table in which we know the average height of all the species, the hectares of each species in the burned area and the number of treetops that exist for each species in one hectare. Thanks to all these data we can have an estimate of the biomass of each of the species in the burned areas of Alto-Minho.
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