To find the VELMAP package in MATLAB for inverting GNSS data in a specific region, you can follow these steps:
Search the MathWorks File Exchange website: The MathWorks File Exchange is a repository of MATLAB code submitted by users from around the world. You can search for the VELMAP package by going to the website and entering "VELMAP" in the search bar.
Check the MATLAB Central community: The MATLAB Central community is another source of MATLAB code and tools, including packages for geodetic applications. You can search for the VELMAP package by going to the website and entering "VELMAP" in the search bar.
Contact the authors of the VELMAP package: If you are unable to find the VELMAP package through the MathWorks File Exchange or the MATLAB Central community, you can try contacting the authors of the package directly. You may be able to find their contact information through a search engine or by contacting the academic institution or research organization where they work.
Please note that the availability of the VELMAP package may depend on its licensing and the permissions granted by its authors. If the package is not publicly available, you may need to obtain a copy through other means, such as contacting the authors directly or obtaining a license through a commercial provider.