<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML><HEAD>
<META content="text/html; charset=US-ASCII" http-equiv=Content-Type>
<META name=GENERATOR content="MSHTML 10.00.9200.16736"></HEAD>
<BODY id=role_body style="FONT-SIZE: 10pt; FONT-FAMILY: Arial; COLOR: #000000"
bottomMargin=7 leftMargin=7 rightMargin=7 topMargin=7><FONT id=role_document
color=#000000 size=2 face=Arial>
<DIV>Version 2.0 on Windows, just loaded normally.</DIV>
<DIV>Here is my problems.</DIV>
<DIV>I am studying the growth of a village in Somerset over the past few
centuries.</DIV>
<DIV> </DIV>
<DIV>I have an esri file of the roads in 2006. I have a paper map of the
roads in 1969. First, I make up an layer for the roads in 1969 by deleting
features from the 2006 layer and saving the result in the 1969 roads layerTo get
a difference map, that is (say) the 1969 roads in black and the new (1969 to
2006) roads in red, I map the 2006 map in red, then overlay the 1969 in
black. But the 'black' is not black, but some combination of red and
black. I have tried the options in Layer blending mode (page 73-74)
without success. Question One is - how do I overlay one colour over
another and still retain that colour?</DIV>
<DIV> </DIV>
<DIV>Another way I tried was this. From the attribute table for 2006 road
map, I selected those features corresponding to the new roads (page 105-106
in the User Guide) and saved them as a new layer , the difference layer.
Then just mapped the 1969 map and this new layer. This worked.
Unfortunately, I missed a few of the new roads, so I want to select more
features from the 2006 layer and add these to the already existing difference
layer. I cannot find out how to do this, that is add features to an
already existing layer. Question Two is; how can one add features to
an already existing attribute table?</DIV>
<DIV> </DIV>
<DIV> I suppose all this is quite simple, but I am a beginner. </DIV>
<DIV> </DIV>
<DIV><FONT lang=0 size=2 face=Arial FAMILY="SANSSERIF" PTSIZE="10">Peter,<BR>15
Woodbarton,<BR>MILVERTON,<BR>Taunton TA4 1LU<BR>01823 400
272<BR>hpeter784@aol.com</FONT></DIV></FONT></BODY></HTML>