Скачать или смотреть Resolving R Issues: How to Export Files as .tif Using Raster Package

Learn how to solve the issue of R exporting raster files as `.gri` and `.grd` instead of `.tif` by adjusting the code for proper file formatting.
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This video is based on the question https://stackoverflow.com/q/75572228/ asked by the user 'Fruuutz' ( https://stackoverflow.com/u/20548218/ ) and on the answer https://stackoverflow.com/a/75572302/ provided by the user 'dww' ( https://stackoverflow.com/u/2761575/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Introduction

If you've been using R for your spatial data analysis and are encountering an issue where your output files are being saved as .gri and .grd instead of the desired .tif, don't worry! Many users face this problem, especially when transitioning from different operating systems like Windows to Mac. In this guide, we'll go over the steps necessary to ensure your Raster outputs are correctly formatted as .tif files.

Understanding the Issue

When using the Raster package in R, you might expect that a simple writeRaster function would save your output files in the desired format. However, if you're using an argument that doesn't correspond to the expected parameters of the function, R might throw you a curveball and save the files in a different format than intended.

Common Reason for the Issue

Incorrect Argument Usage: The writeRaster function does not have a type parameter as one might assume. Instead, it requires a different argument to specify the raster format.

The Solution

To resolve this issue and generate the correct .tif files instead of .gri or .grd, here’s what you need to do:

Step 1: Update the WriteRaster Function

Instead of using type = "tif" in your writeRaster function, you should use the format argument to specify that you want to save your file in GTiff format. Here's how you can do this:

Correct Syntax

[[See Video to Reveal this Text or Code Snippet]]

By doing this, you clearly inform R of the file format you wish to save in.

Step 2: Alternatively, Adjust Your File Name

Another straightforward way to ensure your file is saved in the desired format is simply to add .tif at the end of your file name while letting R use its default settings. In the case of the example, the code would look like this:

[[See Video to Reveal this Text or Code Snippet]]

This approach is easier and will also prompt R to save your file in the required format.

Conclusion

If you find yourself exporting .gri and .grd files instead of .tif while using the Raster package in R, remember that it boils down to how you specify the format in your writeRaster function. By updating either the format parameter or just appending .tif to your file name, you can ensure that your outputs meet your expectations. Happy coding! If you have more questions about R or spatial data analysis, feel free to reach out in the comments!