<div dir="ltr"><div>I'm not aware of any places where MassGIS is wrong...<br></div><div>Recently I asked them about the border between Cantor and Norwood near the exits 11 of I-95 which looked a bit suspicious to me:</div><div>****<br></div><div>ME:<br><br>Hi Paul,<br>I've noticed that the Neponset River near the Exits 11 from I-95 highway has been modified (streamlined).<br>Do you know if the border between Norwood and Canton has been adjusted accordingly or kept along the old flow?<br>Different sources suggest different results:<br>- the map from <a href="http://maps.massgis.state.ma.us/map_ol/canton.php">http://maps.massgis.state.ma.us/map_ol/canton.php</a> suggests that the border remains along the old stream<br>- the map from <a href="https://www.town.canton.ma.us/DocumentCenter/View/5632/2019-Street-Map">https://www.town.canton.ma.us/DocumentCenter/View/5632/2019-Street-Map</a> shows that the border has been aligned along the new stream<br><br>PAUL:<br><br>I do not know that answer to this specific boundary issue. But I can tell you that our datalayer is updated when the disputes/discrepancies get ironed out. My guess would be that the original bound contained language about the river. When it was rerouted for 95 a cartographer at some point tried to recreate and simply followed the river as it existed at the time, and that our data is correct.<br>I could be cc’ing a colleague who may have more info on this particular instance, but I have been instructed not to bother him. <br></div><div><br></div><div>***<br></div><div><br></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Thu, Jun 11, 2020 at 4:43 PM Greg Troxel <<a href="mailto:gdt@lexort.com" target="_blank">gdt@lexort.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">Yury Yatsynovich <<a href="mailto:yury.yatsynovich@gmail.com" target="_blank">yury.yatsynovich@gmail.com</a>> writes:<br>
<br>
> Sorry, Greg, I could have explained in more clearly.<br>
> Here is an example of a border between Newton and Watertown:<br>
> The way (<a href="https://www.openstreetmap.org/way/142866017" rel="noreferrer" target="_blank">https://www.openstreetmap.org/way/142866017</a>) is the border between<br>
> Newton and Watertown and this way is, essentially, a duplicate of the<br>
> Charles River stream. Wikipedia says "From Watertown to Waltham to Needham<br>
<br>
I looked at this in OLIVER, and the boundary looks to be pretty<br>
mid-point of their representation of water. One can nitpick about the<br>
exact points, but it looks pretty good:<br>
<br>
<a href="http://maps.massgis.state.ma.us/map_ol/oliver.php?lyrs=2019%20Color%20Orthos%20(USGS)~Orthos_2019~%7CStructures~Basemaps_Structures~%7CTax%20Parcels%20for%20Display~Basemaps_L3Parcels~%7CDetailed%20Features~Basemaps_MassGISBasemapWithLabels2~%7CTax%20Parcels%20for%20Query~massgis:GISDATA.L3_TAXPAR_POLY_ASSESS~Blank_Polys_Max_18057%7CMassachusetts%20Towns%20Survey%20Boundaries~massgis:GISDATA.TOWNSSURVEY_ARC~GISDATA.TOWNSSURVEY_ARC::Default&bbox=-71.21519443000564,42.363946497684616,-71.21228423322435,42.365724173378744&coordUnit=m&measureUnit=m&base=MassGIS%20Statewide%20Basemap¢er=-7927477.1998803,5215787.6488628&zoom=19&opacity=1,1,1,1,1,1&baseO=1&filt=undefined%7Cundefined%7Cundefined%7Cundefined%7Cundefined%7Cundefined" rel="noreferrer" target="_blank">http://maps.massgis.state.ma.us/map_ol/oliver.php?lyrs=2019%20Color%20Orthos%20(USGS)~Orthos_2019~|Structures~Basemaps_Structures~|Tax%20Parcels%20for%20Display~Basemaps_L3Parcels~|Detailed%20Features~Basemaps_MassGISBasemapWithLabels2~|Tax%20Parcels%20for%20Query~massgis:GISDATA.L3_TAXPAR_POLY_ASSESS~Blank_Polys_Max_18057|Massachusetts%20Towns%20Survey%20Boundaries~massgis:GISDATA.TOWNSSURVEY_ARC~GISDATA.TOWNSSURVEY_ARC::Default&bbox=-71.21519443000564,42.363946497684616,-71.21228423322435,42.365724173378744&coordUnit=m&measureUnit=m&base=MassGIS%20Statewide%20Basemap¢er=-7927477.1998803,5215787.6488628&zoom=19&opacity=1,1,1,1,1,1&baseO=1&filt=undefined|undefined|undefined|undefined|undefined|undefined</a><br>
<br>
<br>
Can you point to someplace where the MassGIS data is apparently wrong?<br>
<br>
<br>
Or is this all about "there should be one way" rather than a data<br>
quality issue?<br>
</blockquote></div><br clear="all"><br>-- <br><div dir="ltr">Yury Yatsynovich</div>