<html><body><span style="font-family:Tahoma; color:#000000; font-size:10pt;"><div>The county must be running ESRI stuff on their back end, which is why they are exposing their data via ESRI's REST API. That would also explain why their imagery is supported in ESRI's tools.</div>
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<div>JOSM would need to support this ESRI REST API in order for you to consume the county's data. If JOSM doesn't already have this support baked in, it may be able to be added to JOSM via a plugin. That might be a worthwhile endeavor if a lot of agencies are starting to publicly expose their data via this API.</div>
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<div>By the way, if I recall correctly, JOSM uses another ESRI API for USGS imagery, which is based on XML web services (which is way more complicated and verbose than REST). So if JOSM is able to use that ESRI API, I have to think support can be added for this other one.</div>
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<div>But I'm nary the JOSM expert. Is there a JOSM mailing list?</div></span></body></html>