I have over 5,000 to 10,000 photos on my website and I am considering creating an image sitemap that I will add to my WMT. Is that a good idea or is the fact there is so many images in my sitemap can cause any problem?
Thanks tedster. Most of my images are in js photo galleries so when I create the sitemap there is no alt text on most of them. What is the best to do in this case? If I add alt text in the sitemap for each image would that be ok having in mind there is no alt text on the page where the image is, because as I said it comes from a js file?
An xml image sitemap can contain an optional "title" field, and Google will see it. How much use they make of that data, I'm not sure - I never tested it. There's also an optional "caption" field, but to use it honestly you should have a caption displayed on the page, too - makes using it almost superfluous.
Either one is plenty. See [support.google.com...] As I read that, the two are alternative choices - with the .txt file being a courtesy to sites that would have difficulty generating the xml protocol version.
[edited by: tedster at 5:15 pm (utc) on May 20, 2013]