<html><body><div style="color:#000; background-color:#fff; font-family:Courier New, courier, monaco, monospace, sans-serif;font-size:10pt"><div><font face="Arial" size="2"><b><span style="font-weight:bold;">>>>> De :</span></b> Lester Caine <lester@lsces.co.uk></font></div><div><br></div><div style="color: rgb(0, 0, 0); font-size: 13.3333px; font-family: Courier New,courier,monaco,monospace,sans-serif; background-color: transparent; font-style: normal;"><font face="Arial" size="2"><b><span style="font-weight:bold;">>>>> </span></b></font>Now that I understand what is going on, I can see where some off the
'extra' lines come from, and the diagonal is probably due to a boundary
detail from changing sheets.</div><div><br></div><div style="color: rgb(0, 0, 0); font-size: 13.3333px; font-family: Courier New,courier,monaco,monospace,sans-serif; background-color: transparent; font-style: normal;">This is more often due to split of landuse ownership. There is no differences between this lines and the one separating adajacent buildings<br></div><div style="color: rgb(0, 0, 0); font-size: 13.3333px; font-family: Courier New,courier,monaco,monospace,sans-serif; background-color: transparent; font-style: normal;"><br></div><div style="color: rgb(0, 0, 0); font-size: 13.3333px; font-family: Courier New,courier,monaco,monospace,sans-serif; background-color: transparent; font-style: normal;"><font face="Arial" size="2"><b><span style="font-weight:bold;">>>>> </span></b></font>However while the source has two different
shades of block for buildings.</div><div style="color: rgb(0, 0, 0); font-size: 13px; font-family: Arial; background-color: transparent; font-style: normal; font-weight: bold;"><font face="Arial" size="2"><b><span style="font-weight: bold;">>>>></span></b><span> </span></font><span style="font-weight: normal;"> I don't think they can be used at this
stage to provide useful extra lines.</span></div><div style="color: rgb(0, 0, 0); font-size: 13px; font-family: Arial; background-color: transparent; font-style: normal; font-weight: bold;"><font face="Arial" size="2"><b><span style="font-weight: bold;">>>>></span></b><span> </span></font><span style="font-weight: normal;">The process that is extracting the
vectors should further process the data so that each block IS a single
continuous outline?</span></div><div style="color: rgb(0, 0, 0); font-size: 13px; font-family: Arial; background-color: transparent; font-style: normal; font-weight: bold;"><font face="Arial" size="2"><b><span style="font-weight: bold;">>>>></span></b><span> </span></font><span style="font-weight: normal;">Later comparison will then be easier as long as say
90% of the area matches the previous instance?</span><br></div><div style="color: rgb(0, 0, 0); font-size: 13.3333px; font-family: Courier New,courier,monaco,monospace,sans-serif; background-color: transparent; font-style: normal;"><br></div><div style="color: rgb(0, 0, 0); font-size: 13.3333px; font-family: Courier New,courier,monaco,monospace,sans-serif; background-color: transparent; font-style: normal;">No this is not sufficiant I think because some times you have adjacent buildings that are not a single building. You also have cases when line separate building parts which have different number of levels or which are "light buildings" ( without wall by example )<br></div><div style="color: rgb(0, 0, 0); font-size: 13.3333px; font-family: Courier New,courier,monaco,monospace,sans-serif; background-color: transparent; font-style: normal;"><br><font face="Arial" size="2"><b><span style="font-weight:bold;">>>>> </span></b></font>Of cause
simply
importing thousands of these objects without a visual check of every one
of them is something completely different to hand tracing every one of
them.</div><div style="color: rgb(0, 0, 0); font-size: 13px; font-family: Arial; background-color: transparent; font-style: normal; font-weight: bold;"><font face="Arial" size="2"><b><span style="font-weight:bold;">>>>> </span></b></font><span style="font-weight: normal;">I'd prefer that there was some cross check that objects have been
verified.</span></div><div style="color: rgb(0, 0, 0); font-size: 13px; font-family: Arial; background-color: transparent; font-style: normal; font-weight: bold;"><font face="Arial" size="2"><b><span style="font-weight:bold;">>>>> </span></b></font><span style="font-weight: normal;">And in my book, having to manually select objects to import
would provide that check?</span></div><div style="color: rgb(0, 0, 0); font-size: 13px; font-family: Arial; background-color: transparent; font-style: normal; font-weight: bold;"><font face="Arial" size="2"><b><span style="font-weight: bold;">>>>> </span></b><span></span></font><span style="font-weight: normal;">So I'd block any area select function, so that
hundreds of objects can't simply be picked and pushed?</span></div><div style="color: rgb(0, 0, 0); font-size: 13.3333px; font-family: Courier New,courier,monaco,monospace,sans-serif; background-color: transparent; font-style: normal;"><br></div><div style="color: rgb(0, 0, 0); font-size: 13.3333px; font-family: Courier New,courier,monaco,monospace,sans-serif; background-color: transparent; font-style: normal;">Please also notice that this is sometime not easy to distinguish on aerial imagery if the split line really exist or not.</div><div style="color: rgb(0, 0, 0); font-size: 13.3333px; font-family: Courier New,courier,monaco,monospace,sans-serif; background-color: transparent; font-style: normal;"><br></div><div style="color: rgb(0, 0, 0); font-size: 13.3333px; font-family: Courier New,courier,monaco,monospace,sans-serif; background-color: transparent; font-style: normal;">Cheers</div><div style="color: rgb(0, 0, 0); font-size: 13.3333px;
font-family: Courier New,courier,monaco,monospace,sans-serif; background-color: transparent; font-style: normal;">Julien</div><div style="color: rgb(0, 0, 0); font-size: 13.3333px; font-family: Courier New,courier,monaco,monospace,sans-serif; background-color: transparent; font-style: normal;"><br></div><br> <div style="color: rgb(0, 0, 0); font-size: 13.3333px; font-family: Courier New,courier,monaco,monospace,sans-serif; background-color: transparent; font-style: normal;"><blockquote style="border-left: 2px solid rgb(16, 16, 255); margin-left: 5px; margin-top: 5px; padding-left: 5px;"><div style="font-family: Courier New, courier, monaco, monospace, sans-serif; font-size: 10pt;"> </div> </blockquote></div> </div></body></html>