<div dir="ltr"><div dir="ltr"><div dir="ltr">In most states the coastal county boundaries correspond with the 3 nmi state boundary. I'm actually not aware of any that don't and from the court cases cited in the initial email, it sounds like California counties do in fact extend to the 3 nmi boundary. I took a look at the TIGER county boundaries and they correspond pretty well to what's already mapped for the
Monterey-Santa Cruz boundary across Monterey Bay and they extend out 3 nmi. I looked around for county and state sources for the boundaries, but like
Martijn said, they only go to the shoreline. Attribution in the relation for Monterey County is "CASIL cnty24k09_1_poly.shp" which leads me to <a href="https://geodata.lib.berkeley.edu/catalog/ark28722-s73w23">https://geodata.lib.berkeley.edu/catalog/ark28722-s73w23</a>. Again this data-set only goes to the shoreline. The source on the 3 nmi boundary is "TIGER 2011 county borders". What I think someone has done is use the CASIL data on land and extended it out using TIGER to demarcate county divisions out at the 3 nmi boundary, which I think was the correct thing to do.<br></div><div dir="ltr"><br></div><div>So back to the original question about the Monterey-Santa Cruz line... I can look around for more information and may call Monterey County and see if they have a more up-to-date county boundary. <br></div><div><br></div><div>Kevin<br></div><div dir="ltr"><br></div><div><br></div></div></div><br><div class="gmail_quote"><div dir="ltr">On Wed, Dec 5, 2018 at 10:57 AM Greg Troxel <<a href="mailto:gdt@lexort.com">gdt@lexort.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Martijn van Exel <<a href="mailto:m@rtijn.org" target="_blank">m@rtijn.org</a>> writes:<br>
<br>
> You are correct. The official Monterey County GIS file from [1] has<br>
> the boundary at the shoreline, whereas OSM has it going out into the<br>
> ocean, see <a href="https://imgur.com/a/aCMROQZ" rel="noreferrer" target="_blank">https://imgur.com/a/aCMROQZ</a> <<a href="https://imgur.com/a/aCMROQZ" rel="noreferrer" target="_blank">https://imgur.com/a/aCMROQZ</a>><br>
> (OSM in orange, Official GIS in dark gray).<br>
><br>
> I don’t know all coastal counties have their official boundaries at the shoreline, but OSM has them all reaching into the ocean. [2]<br>
> I also don’t know if there is some convention in OSM (US) to have<br>
> coastal country boundaries match up with the higher level boundary. If<br>
> there is perhaps we may need to revisit?<br>
<br>
This is tricky business.<br>
<br>
Generally, the jurisdiciton of the state seems to go to 3 nmi (east and<br>
west coasts). However, whether those state lands are in any town or<br>
county is an interesting question.<br>
<br>
<a href="https://coast.noaa.gov/data/Documents/OceanLawSearch/Summary%20of%20Law%20-%20Submerged%20Lands%20Act.pdf" rel="noreferrer" target="_blank">https://coast.noaa.gov/data/Documents/OceanLawSearch/Summary%20of%20Law%20-%20Submerged%20Lands%20Act.pdf</a><br>
<a href="http://maps.massgis.state.ma.us/czm/moris/metadata/moris_sla_arc.htm" rel="noreferrer" target="_blank">http://maps.massgis.state.ma.us/czm/moris/metadata/moris_sla_arc.htm</a><br>
<br>
In Massachusetts, towns and counties do include the state lands.<br>
<br>
I would recommend looking up California law and asking this question in<br>
particular.<br>
<br>
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