<div dir="ltr"><div>Many borders, particularly international borders, are prominently marked ("monumented") (e.g. [1]), and thus are verifiable on the ground (and sometimes the monumentation is so prominent it is visible from imagery). It is what is physically monumented on the ground that is the legal border, from [1]: "<span class="">If some of the original markers were off by a few
dozen -- or a couple of hundred -- feet here and there, which was
inevitable given the conditions in which the crews worked and the
technology of the time, it doesn’t matter because it is the position of
the monuments on the ground, not the 141st meridian, that is the de
facto boundary by treaty."</span><br><br></div>Legislative districts on the other hand, because they can change (every 10 years in US), are not monumented directly, and therefore would be very difficult to verify on the ground. In the US one would have to look up the official text description of the district, then look up the census blocks it references (" most redistricting was based on
whole census blocks. Kentucky was the only state where congressional
district boundaries split some 2010 Census tabulation blocks." [2]), and then head out to the field to observe the features that the census blocks reference. Census blocks are generally defined by streets, rivers and other physical features [3].<br><div><br>Mike<br><br>[1] <a href="http://www.adn.com/article/20140727/trail-monuments-men-border-crews-cut-20-foot-swath-alaska-yukon-line">http://www.adn.com/article/20140727/trail-monuments-men-border-crews-cut-20-foot-swath-alaska-yukon-line</a><br>[2] <a href="https://www.census.gov/geo/maps-data/data/aboutcd.html">https://www.census.gov/geo/maps-data/data/aboutcd.html</a><br>[3] <a href="https://en.wikipedia.org/wiki/Census_block">https://en.wikipedia.org/wiki/Census_block</a><br></div><div class="gmail_extra"><br><br></div></div>