[Maptitude] Re: [Healthmaps] raster to vector

[healthmaps]

Elio and others, thanks for the tip. R2V looks promising but the price tag, even the academic price does not work for my university (temporary) in Peru. I have several replies and it seems that the bottom line is "get ready for a lot of work..."  My maps are pretty noisy b&w scans of street and block maps. Lots of polygons are not closed because of the image quality and many lines have sections missing. Also lots of text that overlaps map features, other "noise"  that makes for a good old fashioned map, but not good for R-V conversion. At a distance the maps look fine, close up there are problems. Peter suggestrd trying out Mapt's editing feature, just trace over the image. I have tried that a little bit and it is not too bad. I need a covey of grad students ...
 
Dick Hoskins
 
-------------- Original message -------------- 



Oops, I gave out the wrong web address for R2V -- it should have been http://www.ablesw.com/
 
Elio

----- Original Message ----- 
From: E. Spinello 
To: [EMAIL PROTECTED] ; Maptitude@yahoogroups.com 
Cc: [EMAIL PROTECTED] 
Sent: Monday, June 20, 2005 4:44 PM
Subject: Re: [Healthmaps] raster to vector 

You did not indicate whether you are trying to use them as a map underlay or whether you want to convert them into polygons, lines, and points. If you want to convert them, there is  program called R2V (Raster to Vector) that allows you to convert raster images to vector images. I used it for a project a few years ago and it seemed to work fairly well. Their website is http://www.r2v.com/.  Using them as an underlay is usually not terribly difficult but I have never tried to do it with Maptitude before. There are, however some reasonably good ArcView extensions that will allow you to set control points and then adjust the image to the extent of the map.
 
Elio Spinello
 
-----------------------------------------------Elio Spinello, MPH, Ed.D.Department of Health SciencesCalifornia State University, Northridge18111 Nordhoff StreetNorthridge, CA 91311http://wwww.csun.edu/~hchsc018[EMAIL PROTECTED]-----------------------------------------------"Small print leads to big risk"Ferengi Rules of Acquisition (# 8)

----- Original Message ----- 
From: [EMAIL PROTECTED] 
To: Maptitude@yahoogroups.com 
Cc: [EMAIL PROTECTED] 
Sent: Monday, June 20, 2005 3:32 PM
Subject: [Healthmaps] raster to vector 

I have scanned images of B&W maps of towns in Perú. I want to turn these into GIS layers.
 
Applications that will do this (free or cheap)? and make a file Maptitude will read. 
 
Words of caution and/encouragement? 
 
These maps are scanned at 400 dpi but many of the lines are spotty, unintentional breaks, likely not all that good maps to begin with (I do not have access)
 
Several have map grids overlaying the map. I have control points, again, the line quality is sometimes broken. Also some noise, that is little smudges, also text.
 
thanks -
 
Richard Hoskins



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