I am new to Map 3D. I have to redraw 19th century raster maps that cannot be vectorized automatically.
The borders of the parcels are heavily curved.
I insert the raster map and start to trace/draw on a new layer.
1. Now, if I want to draw a second parcel that has a common curvy border with a first parcel how do I best trace the common border? What I would like is that the vertices along the common border are all displayed so I could just click them rapidly to draw the common border of the second parcel. However I cannot find a way to display all vertices. Is there a solution for this?
2. For drawing a new parcel alongside multiple existing parcels, a beter/faster option would be that I just click the vertices on junctions of the common border and the software would automatically trace the line between the junctions, create all vertices and snap them to the existing vertices on the common border of the existing parcel. Is there a solution for this?
You don't need to draw the common border, since Autocad Map does it automatically.
When you end the raw vectorization:
Many thanks, this could be a perfect solution!
Some new questions now if I may?
"breaking crossing objects" breaks the common border away from parcel 1 and makes it a separate polyline.
"mapclpline" closes the parcels 1 and 2 along this separated polyline.
The separated polyline is not removed after that, so the common border has now 3 lines on top of each other.
Is this OK? Should I remove this separated polyline afterwards?
Sometimes after reviewing the results some adjustments must be made to the position of some vertices.
If I click a vertex on the common border of parcel 1 and move it, the underlying vertex of parcel 2 does not move with it. All my Osnap options are on. How can I set Autocad to make all snapped vertices move together?
What exactly is the difference between a node and a vertex? If I click a vertex/node and move it, Autocad calls it a vertex but "maptocreate" calls the same item a node?
The command _MAPCLPLINE allows you to create the closed polys on a new layer, so you can easily freeze the layer containing the manually drawn border.
Use the _STRETCH command instead.
I think "node" means "centroid", but let's wait for an Autodesk specialist opinion...
A set of geometric relationships between drawing objects, including links, nodes, and centroids. Topology describes how lines, nodes, and polygons connect and relate to each other, and forms the basis for advanced GIS functions such as network tracing, spatial analysis, buffer analysis, overlay analysis, and dissolving a polygon topology.
Answer #1: OK
Answer # 2: I think I use "stretch". If I click the vertex, the command line shows "stretch" and the little menu near the arrow shows the options stretch vertex/ remove vertex/ add vertex. However, when I drag the vertex the underlying vertices do not move with the upper vertex. If I type "stretch" in the command line Autocad wants me to select objects; however I do not want to move objects, only vertices.
Answer #3: OK
Many thanks again!
Hello Antoniovinci and Dave,
Your methods both work well so my original problem is now almost solved.
Almost because I am not completely happy with the fact that each method leaves an unclosed polyline behind.
The solution of adding the results of the operation to a new layer works fine if you do the operation only once but I work on maps with more than 1000 parcels so I tend to work step by step. Every 50 parcels or so i would like to perform the operation and then the results of the previous steps are also left behind on the layer with the unclosed polylines. Is there a method to delete all unclosed polygons? I think this would make me completely happy.
As said before, you should create the topology AFTER the complete manual vectorization.
Once the polygon topology is correctly generated, you get INSTANTLY all the closed polylines thru _MAPCLPLINE.
In other words: the tedious work is to draw the old scanned paper, while the clever finishing belongs to the powerful tools of Autocad Map.
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