This seems a completely impractical design that could take literally hours for the layout to update. Even fitting 1300 portals on one layout seems impractical just from a visual design point of view unless you use a tab or slide control to break them up into smaller more visually manageable groups.
I have a 2d overheard image of all our locations in our yard (its a pretty large image, if thats relevant). All I want is to overlay a quantity of the items in each location and have people be able to click the quantity and have a new window popup showing the details of whats in that location; which i've got working 100% on a small scale. Can you think of any alternative design approaches to this?
A yard with 1300 different locations? that's a not "pretty large" it's HUGE!
I'd take that image or plan of your Yard and divide it into sections and display one section at a time. Each can be a different layout with a much smaller number of one row portals. You can still use a plan or image of the entire yard, but you then click on that image to select the portion of the yard that you want to see and then click again to open the new window (or better yet, a popover) for your details.
I've considered that approach for the Family Orchard Farm where you'd tap a map of the farm to select a field and then tap a map of the field to select a specific tree...
Dividing them and using a popover is a great idea. I'm not sure how many sections I'll have to divide it into. Based on your experience, what would be the max amount of portals that you would put on popover/layout. Can a layout hold more? Popover would look alot cleaner but if it can't hold as many portals as a layout then i'll just do the new window -> go to layout approach.