Just curious if it is necessary to resubmit a sitemap after you make significant amount of revisions to the site. Thanks in advance. Chris
If you add new URLs or URLs change then I would upload the new sitemap to my site. However it is not necessary to submit it to Google. Once Google has the sitemap listed, they come back to check it. If you login to your Sitemap account it will show you when the last time it visited your sitemap was. Just keep your sitemap up to date and you will be fine as long as you have submitted it once.