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    Download apps hot star 3 0To employ this palette within a ggplot plot you have to go over the predefined palette recalled inside the ggplot() function.
    Download apps hot star 3 0Each colour can be therefore decomposed into a triple of this colours.
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    Download apps hot star 3 0If you are wondering why we specified 32 as number of colours, you just have to read a bit more on to discover it.
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    Download apps hot star 3 0Feel free to comment here suggesting further developments or use cases.
    Download apps hot star 3 0And those centroids are points whose minimise the distance from the other points within their cluster.
    This is why I often try to translate my code into packages, especially when it contains some functions which could be useful for someone.
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    The most obvious which comes to mind is to employ this palette within a ggplot plot, and we will see how to do it.
    Download apps hot star 3 0Making it less wordy, let us look at the formula behind the distance.
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    Download apps hot star 3 0See below an example of a resulting jpg map from DOY 273 in 2017, the 30 September 2017.
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    Pointillists started painting on canvas not mixing their colours in greater or smaller colour fields but rather applying them as small points one next to the other.
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    This I think is the case for the processing steps we have seen before, as we will see later on.
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    The jpeg package, developed by Simon Urbanek provides us functions to import an image and decomposing it into points each of which codified in the terms of the RGB system.
    This is what for instance the pointillisme thought a long time before pc's.
    Download apps hot star 3 0RGB codification, a convenient way to measure colours firstly introduced during the '800 which became popular during the age of televisions and electronical monitors (you know, they need a way to measure colours too).
    We just have to pass to this function the dataset over which we want to apply the algo, specifying the number of clusters.
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    Download apps hot star 3 0The probably most obvious answer would have involved downloading one of these masterpieces, find out a website with point and click colour picking featyre and build a palette from it.
    Step 0 Download MODIS data from AppEEARS.
    Download apps hot star 3 0One of the best gifts every R user receives from the R community is the ton of packages available to accomplish nearly every data mining task.
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    That is why it turns to be effective with such kind of problems where populations can be pertaining to multidimensional spaces.
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    Download apps hot star 3 0Skipping install of 'paletter' from a github remote, the SHA1 (66780b00) has not changed since last install.
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    Step 3: Run the R code.
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    Download apps hot star 3 0Let us try to do it for real, importing an image into our R environment.
    The SVI values represent how many standard deviations the present state of vegetation differs from the EVI mean in a specific pixel.
    One of the most widely known examples of this kin.
    The post will give you a clear view of how the task was automated, providing detail of the clustering algorithm employed.
    Red Green and Blues, trying to select from frequency tables the most representative ones.
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    Download apps hot star 3 0Here it is our freshly and autonomously made palette, which greatly represents the main hues of Raffaello's painting.
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    Download apps hot star 3 0EVI and Pixel Reliablity data (including the VI quality) will be displayed.
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    For this sample of 30 September 2017 (DOY 273), the EVI value in each pixel is compared to the EVI mean of DOY 273 from 2000 to 2017 in the respective pixel.
    Download apps hot star 3 0As you can see we applied the kmeans function passing as dimensions R G and B and a number of clusters equal to 30.
    Download apps hot star 3 0However, it cannot be used to quantify the magnitude of a drought hazard.
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    Download apps hot star 3 0Moreover some other more dynamic ideas are exposed below.
    Download apps hot star 3 0Step 3 Run the script.
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    Adjust the file naming according to the data you are processing.
    Download apps hot star 3 0What do you think, is this enough to be a representative palette?
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    Download apps hot star 3 0But, how to do it?
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    Step 1: Download R code.
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    Step 2: Adjust the script.
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    The scalebar to the right shows the positive and negative deviations of pixels to the EVI mean with green highlighting positive deviations and red highlighting negative deviations.
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    Download apps hot star 3 0Those palettes are coming from years and years of studies around colour theory and pictorial techniques and, I started thinking, would do a great service if employed as plot's palettes, with their complementary colours or their balanced set of hues.
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    We can therefore take our picture and describe it as a set of points each of which with a codified colour, in terms of Red Green and Blue.
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    So they are RGB triples representative of homogenous clusters of other RGB triples composing our image.
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    The script needs small adjustments to fit your data.
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    To employ it we have to download it into our environment, which can be easily done via the download.
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    Getting a closer look to an image we find it can be decomposed into reasonably small points, each of which is of a single colour.
    We could also specify some other settings, like the maximum number of iterations of above introduced steps (b) (c) and (d).
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    Enter the path to the folder where you have enough free space to store your MODIS data, the temporary files and the resulting products.
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    As is often the case within the R world, we have a package to help us with this task.
    The typical measure employed here is the euclidean distance, and particularly the squared euclidean distance.
    Download apps hot star 3 0The vegetation in areas colored in yellow on the other hand have been identified with an average vegetation condition.
    Decomposing an image to its constitutent points is the first needed step to apply on it every kind of statistical, algorithmical or matematical concept.
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    Also, if you derived the SVI from the NDVI, change (EV) to (NDVI).
    To do this you have at your disposal the scale_colour_manual function, which allows you to specify a vector of RGB values to be employed as palette.
    Download apps hot star 3 0Define the time period of your data: January 2000 to today.
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    Have you got any other idea?
    Formally it is the point which minimises the euclidean distance between him and the other points within the group.
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    Download apps hot star 3 0The SVI provides a useful analysis tool for the assessment of vegetation trends and monitoring of areas affected by drought.
    Download apps hot star 3 0Consequently, if you first used the original R script but then had to switch to this R script due to the size of the area, please sort all EVI and Pixel Reliability data into your main directory (datapath, see below).
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    Flowchart of the R code including the cloud mask and chunking.
    Download apps hot star 3 0Step 2 Adjust the script.
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    Download apps hot star 3 0To get it just think it is the barycenter of a given set of point.
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