Many of large ranch lands and farms are going to be listed exclusively by a certain broker which may require website scrapping at minimum and or heads up data entry at worst.

Colorado:

https://www.ranchland.com/

For general usability, I'd suggest at a minimum adding State and County lines, and further, census place points for labeling.

You've included some interesting filters that's for sure.

And of course my usual plug for a great mapping book - How to Lie with Maps - https://press.uchicago.edu/ucp/books/book/chicago/H/bo274005...

I'd be willing to give you input.

I saw similar things for a property in Joshua Tree, California that had no address, just a street name.

I would do as /u/ecommerceguy has suggested and at the very least add a toggle for State and County lines, and label roads and towns and other useful information.

As a feature that you could consider eventually adding for those who are interested in finding a rural property to land on, consider adding a toggle that can show the locations of the closest power and water access for a property using an labelled icon or other visual aid.

Sometimes the biggest challenge in determining whether you should purchase a property that you can live on is to find a place that is close enough to existing infrastructure that it doesn't cost more than the land value to gain access to water. Electricity is less important unless you are far enough north that your exposure limits your collection ability so that battery storage becomes a critical cost to consider.

With that in mind, adding info about solar suitability could be useful.

Here is a Google maps project that can help evaluate options for a property.[0]

[0]https://mapsplatform.google.com/maps-products/solar/

Water is the biggest challenge in most places. I see that you recommend pulling state wells logs for the properties. Perhaps a link to that resource would be useful. I have done water availability and quality work now for a couple of relatives in different states. There is a lot of variability in the data available and the quality of the data. Knowing which agency handles private and public well locations helps a lot. Knowing which agency monitors water quality locally also is important.

I know this is part of due diligence for an interested buyer. I think for your tool to maximize value to a buyer it should make it easy to find the bits of information that can steer the buyer to a conclusion.

He intends to occupy and farm it. Organic if possible, else close enough. And I when he can afford, he'll be looking for more. I sent him your url.

Another thanks on his behalf, and his family too!

I want to buy land some day and want to avoid the hotspots where my freedom of my property is curtailed in this way.

And maybe the soil use isn't specifically limited, but other proxies are in effect: I think of (a) water use, (b) spread of patented seed observed and business prosecution of your crop or even (c) control of your livestock or animals because "<insert plague or health concern here>".