Hi Jachym,
Did all those things. Here are the values from the custom menue:
Current SNAPPING threshold (map scale is 1:63360): |
| Map : 16.093440 meters. |
| Dig : 0.010000 - 1 / 100.000000 of an inch. |
| Enter new Dig threshold or <RETURN> when finished: |
m-----------------------------------------------------------------------------j
If I read this correctly, the snapping distance on the map is 16 meters, and the threshold is 0.01
And yes, the snapped nodes appear red and the nodes with problems appear green (kinda counter intuitive if you ask me... unless red means "don't touch it... it's fine"). I think what I'm looking for is a way to keep nodes active after a polygon snaps has been closed. That way you can come back and start a second polygon off the node from the side of the first polygon (thereby sharing a side).
Kirk
On Apr 7, 2004, at 2:05 PM, Jachym Cepicky wrote:
Hullo,
first you have to set your Map's scale to (in the Information screen -
the first screen after you select the vector file name) some other
value, than 1:1. Than
you have to go to Costumise Menu and set the snapping threshold. In
GRASS, the snapping value is in meters and you will get it thrue the
snapping threshold
Try something like this:
Map's scale Reasonable snapping Snapping thrashold
distance
1:5 000 to 1:10000 1 to 2 m 0.0017 to 0.002
1:10 000 to 1:25 000 2-5 m 0.002 to 0.008
1:25 000 to 1:50 000 5-10 m 0.008 to 0.017
The snapped nodes appear red (usually).
I hope, I have expresed my self.
Jáchym
On Wed, Apr 07, 2004 at 12:46:09PM -0500, Kirk R. Wythers wrote:
I seem to be going though several extra steps in order to get polygons
to close without undershoot/overshoots. I am hoping that someone will
be able to point out a more expedient procedure.
My problem is this: When digitizing common area boundaries, I am having
a hard time getting a new line/area to snap to the line of the existing
polygon (even when I try intentionally to start the new line off of an
existing corner when a node should be). The first node of my new line
is well within my snap threshold, but does not snap.
I can go back "after the fact", and use "Edit/Break" function to insert
a new node on the first polygon, then use "Edit/Snap" to connect the
lines. However, this is time consuming and I was hoping that someone
would point out a technique to get the new line to snap to the fist
polygon in the first place. Once I complete the first polygon the
polygon's nodes seem to disappear. So that by the time I start the line
to close the second polygon, there doesn't seem to be a node to snap
to, just a angle where the node "used to be?".
Thanks,
Kirk
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Kirk R. Wythers tel: 612.625.2261
Dept. of Forest Resources fax: 612.625.5212
University of Minnesota email: kwythers@umn.edu
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--
Jachym Cepicky
e-mail: jachym.cepicky@centrum.cz
URL: http://les-ejk.cz
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Kirk R. Wythers tel: 612.625.2261
Dept. of Forest Resources fax: 612.625.5212
University of Minnesota email: kwythers@umn.edu
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