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heyarne 2021-03-13 16:06:03 +01:00
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@ -47,7 +47,7 @@
"### Treuenbrietzen 2018\n",
"\n",
"The first case is the wild fire in August 2018 that led to the evacuation of three villages (source).\n",
"We load the pre-calculated NBR values and geometries we fetched from OpenStreetMap:"
"The following files contain their respective OpenStreetMap geometries and pre-calculated NBR values for the area:"
]
},
{
@ -429,10 +429,10 @@
"source": [
"The left image shows a dark spot between the three locations marking a decrease in NBR values after the start of the fire on August 23.\n",
"is very likely the result of a loss of vegetation due to the fire.\n",
"However, we can also see other examples of vegetation loss in the bottom left and top right corner of both plots which, according to the burn severity scale, are classified as \"high severity\" burns.\n",
"However, other examples of vegetation loss are visible in the bottom left and top right corner of both plots which, according to the burn severity scale, are classified as \"high severity\" burns.\n",
"\n",
"Given the regular shape of these vegetation loss, we may assume that they are the result of crop harvests or that they have other causes unrelated to the fire.\n",
"This interpretation is **based on assumptions** that need to be verified by experts.\n",
"Given the regular shape of these vegetation losses, it can be assumed that they are the result of crop harvests or that they have other causes unrelated to the fire.\n",
"It is important to stress again that this interpretation is **based on assumptions** that need to be verified by experts.\n",
"\n",
"The area selected is verified against the _Waldbrandstatistik_:\n",
"\n",
@ -861,7 +861,7 @@
"cell_type": "markdown",
"metadata": {},
"source": [
"After masking the array with the shape of the nature reserve, we only keep the pixels within that nature reserve that have at marks of at least a low severity burn."
"After masking the array with the shape of the nature reserve, only the pixels within that nature reserve that have at marks of at least a low severity burn are kept and all others omitted."
]
},
{
@ -960,7 +960,7 @@
"metadata": {},
"source": [
"Please note that fire area and area with burn marks are two different things, but it is the most reliable available information available that is close to ground truth.\n",
"Compared with the Waldbrandstatistik, the area we calculated has an error of approximately 25%."
"Compared with the Waldbrandstatistik, the calculated area has an error of approximately 25%."
]
},
{
@ -980,7 +980,7 @@
"\n",
"The animation above contains a true-color rendering and a frame that highlights wavelengths in the infrared spectrum to create a faux-color image highlighting the burn-scar and decreasing the visibility of smoke.\n",
"\n",
"Using the same data we can get a glimpse of the site before, during and after the fire:"
"The same data gives an impression of the site before, during and after the fire:"
]
},
{
@ -1051,8 +1051,8 @@
"source": [
"The area highlighted in the ESA animation is positioned in the lower-right corner of the superimposed boundary of Lübtheen.\n",
"\n",
"Looking at these true-color image we can see that on June 29 and July 26 we get a very clear view of the area.\n",
"We can also see that there is a lot of vegetation change that is likely not related to the fire, visible when comparing the top and bottom-left parts of the images.\n",
"The true-color image on June 29 and July 26 show a very clear view of the area.\n",
"There is a lot of vegetation change that is likely not related to the fire, visible when comparing the top and bottom-left parts of the images.\n",
"\n",
"This vegetation change is likely also reflected in the NBR and $\\Delta$NBR values.\n",
"\n",
@ -1255,7 +1255,7 @@
"The boundary of the military site exceeds the area for which the $\\Delta$NBR was calculated to the right.\n",
"This part is discarded in further calculations because it is several kilometers away from the apparent fire site.\n",
"\n",
"Following the method above, we isolate the burned pixels within the military site's boundaries and compare their area with the figure mentioned by official sources."
"Following the method above, burned pixels within the military site's boundaries are isolated and counted. Their area is afterwards compared with the figure mentioned by official sources."
]
},
{