I have been looking on-line for a GIS land use layer file that shows all the standard colors that represents each land use code. I have not been successful in finding that. Would you please direct me to where I can find this layer file on-line?
I did not see any standards for land use classification in general because it depends on each country's standard. You need to refer to the standards applied in Ministry of land or Land Bureau in the target country and ask them to give you the color standards applied in their organization.
For example, the American Planning Association defines its own standard, as you can see in the PDF Document: Land-Based Classification Standards. Another example in Cambodia, they also defines their own land use standard in this document: Traditional Color Coding for Land Uses. The same can be found in each country's related organization as stated earlier.