ndvi | python function that uses GDAL | Computer Vision library

 by   iboates Python Version: Current License: No License

kandi X-RAY | ndvi Summary

kandi X-RAY | ndvi Summary

ndvi is a Python library typically used in Artificial Intelligence, Computer Vision, Numpy applications. ndvi has no bugs, it has no vulnerabilities and it has low support. However ndvi build file is not available. You can download it from GitHub.

A python function that uses GDAL and numpy to perform an NDVI calculation given a NIR band and a colour band. User can specify output as a 32-bit floating point image or a 16-bit unsigned integer image. Comes with a small clipping of a LANDSAT-8 surface reflectance image of Halifax, Nova Scotia, Canada for demo purposes. You should be able to demo it right out of the box provided the images are in the same directory as the script itself. Requires osgeo installation of GDAL and numpy (More info on NDVI:
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            kandi-support Support

              ndvi has a low active ecosystem.
              It has 21 star(s) with 14 fork(s). There are 4 watchers for this library.
              OutlinedDot
              It had no major release in the last 6 months.
              ndvi has no issues reported. There are no pull requests.
              It has a neutral sentiment in the developer community.
              The latest version of ndvi is current.

            kandi-Quality Quality

              ndvi has 0 bugs and 0 code smells.

            kandi-Security Security

              ndvi has no vulnerabilities reported, and its dependent libraries have no vulnerabilities reported.
              ndvi code analysis shows 0 unresolved vulnerabilities.
              There are 0 security hotspots that need review.

            kandi-License License

              ndvi does not have a standard license declared.
              Check the repository for any license declaration and review the terms closely.
              OutlinedDot
              Without a license, all rights are reserved, and you cannot use the library in your applications.

            kandi-Reuse Reuse

              ndvi releases are not available. You will need to build from source code and install.
              ndvi has no build file. You will be need to create the build yourself to build the component from source.
              ndvi saves you 15 person hours of effort in developing the same functionality from scratch.
              It has 43 lines of code, 1 functions and 2 files.
              It has low code complexity. Code complexity directly impacts maintainability of the code.

            Top functions reviewed by kandi - BETA

            kandi has reviewed ndvi and discovered the below as its top functions. This is intended to give you an instant insight into ndvi implemented functionality, and help decide if they suit your requirements.
            • Calculate an NDVI formula .
            Get all kandi verified functions for this library.

            ndvi Key Features

            No Key Features are available at this moment for ndvi.

            ndvi Examples and Code Snippets

            No Code Snippets are available at this moment for ndvi.

            Community Discussions

            QUESTION

            Creating a new column using case_when and %in% operator returns NA in R?
            Asked 2022-Apr-11 at 23:33

            I am creating a new column using a vector value matching %in% operator, but it returns NA in the created column.

            Any thoughts and solutions?

            I used this chunk of code:

            ...

            ANSWER

            Answered 2022-Apr-11 at 19:26

            The reason we are getting all NA is because %in% looks for a fixed match and not substring match. If we want to match based on substring, either use grepl (from base R) or str_detect (from stringr) to create logical vectors in case_when.

            Source https://stackoverflow.com/questions/71832801

            QUESTION

            Why does adding tileScale to GEE script does not run the supervised classification?
            Asked 2022-Mar-28 at 12:03

            I am performing a supervised classification with GEE on a region in Italy and I face the error: Output of image computation is too large (15 bands for 931221 pixels = 99.5 MiB > 80.0 MiB). If this is a reduction, try specifying a larger 'tileScale' parameter.

            This is the part of the code that I think makes the problem because before these lines, I did not face errors:

            ...

            ANSWER

            Answered 2022-Mar-28 at 12:03

            There are several factors that make your code heavy, including parameters for scale, amount of bands, tilescale, size of ICs etc.

            I tested and was able to run your version with scale set to 120: https://code.earthengine.google.com/e18afb397b4954c6d841b7d7d5a2238a?accept_repo=users%2Fessepratico%2FPratico_et_al_RemoteSensing_2021

            Also I experimented with using less bands, and was able to run at a scale of 50 without bands 1,6,7,8A.

            You might want to see where you can reduce the amount of computing necessary to run the script. If you want to operate at a scale of 10 I would suggest to divide the region in smaller subsets.

            Source https://stackoverflow.com/questions/71602280

            QUESTION

            Xarray masking at certain location
            Asked 2022-Mar-24 at 17:20

            I have a xarray data set and want to transform the values of my variable in a specific region within the dataset to Nan values. Using dataset.where I only get the specific region as the output but I want to keep the values at the locations around the mask in the array. So basically I want to keep my dataset but replace the values of my variable at certain coordinates with NaN.

            [The dataset is called Lae21 and the lon/lat_mask are sliced coordinates from the dataset]

            ...

            ANSWER

            Answered 2022-Mar-24 at 17:20

            I would use .loc method for this:

            Source https://stackoverflow.com/questions/71601435

            QUESTION

            Convert months names to month.abb in a column rows in a dataframe?
            Asked 2022-Mar-22 at 07:49

            I have a dataframe called data_subset. In the aggregation_period column, I want to replace every row containing month names (e.g, 3, 4, 5,6, 7) as an integer to month.abb format (e.g. Mar, Apr, May Jun, Jul) without affecting other rows containing AMJ and MAMJJ. I have tried the below code chunks, but could not find a way to reach the required results.

            Any thoughts and ideas, please?

            ...

            ANSWER

            Answered 2022-Mar-22 at 06:04

            You can use an ifelse statement to replace the values in the aggregation_period column to integer if it's between 1 to 12, then use month.abb to rename the values.

            head() and tail() of the results are pasted here.

            Source https://stackoverflow.com/questions/71567462

            QUESTION

            how to select a character from a column in a data frame in R?
            Asked 2022-Mar-19 at 15:28

            I have a long format data frame called ind_long_sub . I want to select only characters such sum or mean from the characters in indices column, so that I can create another column contain only characters such as mean and sum. I have tried substr() and strsplit() functions, but could not achieved anything, because the characters in the column have different dimensions.

            Any thoughts or ideas please?

            ...

            ANSWER

            Answered 2022-Mar-19 at 07:59

            You could use str_extract:

            Source https://stackoverflow.com/questions/71536185

            QUESTION

            How to backtransform variables transformed with log1p when creating a plot using ggpredict in R
            Asked 2022-Mar-02 at 23:46

            I fitted a glm model and had to transform some variables with log1p. I now want to create a ggpredict plot with a backtransformed scale. I transformed the variables before using the glm function.

            here's a sample of a few variables of my original data and my code:

            ...

            ANSWER

            Answered 2022-Mar-02 at 23:46

            When I can't get the built-in plot method to do what I want, I use ggpredict() to get the predicted values and build the plot myself. I couldn't make your model work (you only gave us responses where case=1) so I'm making up my own, slightly simpler example.

            Load package and fit model:

            Source https://stackoverflow.com/questions/71324820

            QUESTION

            Data duplication on click on the WMS
            Asked 2022-Feb-22 at 12:02

            When the user click for the first time on the map, he can see the related information. But if he click again, the informations are duplicated as you can see on the image below.

            I expect that the old information is substitute with the newest. For handle this request I've developed the function below:

            ...

            ANSWER

            Answered 2022-Feb-22 at 12:02

            The reason why you are getting more and more values/rows in your table for every click, is because you don't clear the table before adding data.

            You need to call $("#"+elementID).html(); before $("#"+elementID).append(tableHead);

            Source https://stackoverflow.com/questions/71220739

            QUESTION

            Combinations using expand.grid in vector
            Asked 2022-Feb-04 at 16:57

            I'd like to use expand.grid in vector to create all the combinations of the factors in myvec, in a specific format and without duplicates. I try to:

            ...

            ANSWER

            Answered 2022-Feb-04 at 16:57

            If we need to create a single string for combinations from 2 to the length of 'myvec', use combn

            Source https://stackoverflow.com/questions/70990058

            QUESTION

            Plotly js will not display more than one plot in HTML without using subplot
            Asked 2022-Jan-25 at 02:41

            I would like to plot two different plots with Plotly on an HTML page, but only one will show.

            I've tried to make Plotly.js plots based on this codepen.io I found but it will not display multiple plots properly. I have two CSV URLs. If I comment out one URL's code, the other will appear fine. However, if I include both code, only one will display and the other is blank. Is there a certain code I'm missing that will enable multiple plots to exist in an HTML site? I do not want to use subplot.

            Partial code:

            ...

            ANSWER

            Answered 2022-Jan-25 at 02:41

            I think there's a few things you can clean up in your code. It's better to reuse functions by adding more parameters rather than redefine the same function twice (and have to hardcode the data and div tag into each function definition)

            I restructured your code so that the makeplot function plots data from both url1 and url2, and added an additional divName parameter so that you can reuse the processData and makePlotly functions.

            You can find the jsfiddle here

            Source https://stackoverflow.com/questions/70840900

            QUESTION

            How do I solve the 0 element problem in Google Earth Engine?
            Asked 2022-Jan-21 at 21:59

            I used the .combine command to convert two image collections into a two-band image collection (in the last line) to use in a function in the next step. This command is executed but writes 0 elements in the console. Where does this problem come from?

            code link: https://code.earthengine.google.com/ed0992093ff830d926c7dd14403477c6

            Code:

            ...

            ANSWER

            Answered 2022-Jan-21 at 21:59

            ee.Image.combine() uses the system:ID property to join the 2 images. See the documentation here. Since your images do not match, the resulting collection has no images.

            A solution that should fit your needs utilizes the ee.Join.inner() to take advantage of the Date property that you have created to join the 2 image collections. A similar question was answered here.

            Using inner join, I was able to accomplish what appeared to be your goal of finding the difference in NDVI between the S2 and MODIS collections. The full working script can be found here: https://code.earthengine.google.com/dc45df1b7cf83723d53e9f7917975e2d

            Code:

            Source https://stackoverflow.com/questions/70803405

            Community Discussions, Code Snippets contain sources that include Stack Exchange Network

            Vulnerabilities

            No vulnerabilities reported

            Install ndvi

            You can download it from GitHub.
            You can use ndvi like any standard Python library. You will need to make sure that you have a development environment consisting of a Python distribution including header files, a compiler, pip, and git installed. Make sure that your pip, setuptools, and wheel are up to date. When using pip it is generally recommended to install packages in a virtual environment to avoid changes to the system.

            Support

            For any new features, suggestions and bugs create an issue on GitHub. If you have any questions check and ask questions on community page Stack Overflow .
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            gh repo clone iboates/ndvi

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