[Qgis-user] OCR
Hello, This might seem a Little off topic, but maybe someone here can help me. I need to extract toponomical data from old digitized paper maps. I wish to explore *Optical character recognition (OCR). Does anyone has a suggestion/experience with this kind of challenge? Thank you, André Mano * -- --- Associação Leonel Trindade SOCIEDADE DE HISTÓRIA NATURAL Apartado 25 2564-909 Torres Vedras Portugal Sede e Biblioteca: rua Cavaleiros da Espora Dourada, 27A 2560 Torres Vedras Laboratório de Paleontologia e Paleoecologia: Polígono Industrial do Alto do Ameal 2565-641 Ramalhal http://alt-shn.blogspot.com www.alt-shn.org ___ Qgis-user mailing list Qgis-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/qgis-user
Re: [Qgis-user] OCR
On 04/05/2011, at 17:18 , ALT SHN wrote: > Hello, > > This might seem a Little off topic, but maybe someone here can help me. > > I need to extract toponomical data from old digitized paper maps. I wish to > explore Optical character recognition (OCR). > > Does anyone has a suggestion/experience with this kind of challenge? > > Thank you, > > André Mano I'd argue about the "little". I've spent a lot of the last few weeks arguing with OCR software about tables of sample data from old reports, that become point data to plot. Perfectly relevant :) I've never tried getting data from digitized maps, but I'll offer the following generalisations in case it helps. Generally, I have OCR programmes pass me the results as plain text. I lose the formatting, but I don't have to fix stupid guesses about the formatting. This is from my experience, so you may find different. 1. OCR loves paragraphs. 2. Different OCR programmes handle column text differently. Some understand columns, some just assume L->R straight across both columns. 3. OCR does not get along with handwritten anything. (Unless the person was extra-extra neat and consistent in their writing, and even then it's a maybe.) 4. OCR on tabular data works best if the data is lined up in columns, and doesn't have random big gaps. 5. OCR will almost certainly be confused if there is a line on your map running through or near a word. 5a. Actually lines could confuse it quite a bit - I remember one that tried to recreate an in-line sketch map out of ascii characters. Quite amusing. 6. You *will* need to check the results. I'd love to hear what OCR makes of maps. Very curious. -ramon.___ Qgis-user mailing list Qgis-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/qgis-user
Re: [Qgis-user] OCR
Hello, there are some R2V (automatic raster to vector converter) which try to found text on the map. I don't know open source solution for the problem. I've some experiences with VPMax, VPStudio which can find rotated text too. The result is highly depending on the qualy of the map and of cource the quality of the hand written text. Regards, Zoltan On Wed, 4 May 2011, Ramon Andinach wrote: On 04/05/2011, at 17:18 , ALT SHN wrote: Hello, This might seem a Little off topic, but maybe someone here can help me. I need to extract toponomical data from old digitized paper maps. I wish to explore Optical character recognition (OCR). Does anyone has a suggestion/experience with this kind of challenge? Thank you, André Mano I'd argue about the "little". I've spent a lot of the last few weeks arguing with OCR software about tables of sample data from old reports, that become point data to plot. Perfectly relevant :) I've never tried getting data from digitized maps, but I'll offer the following generalisations in case it helps. Generally, I have OCR programmes pass me the results as plain text. I lose the formatting, but I don't have to fix stupid guesses about the formatting. This is from my experience, so you may find different. 1. OCR loves paragraphs. 2. Different OCR programmes handle column text differently. Some understand columns, some just assume L->R straight across both columns. 3. OCR does not get along with handwritten anything. (Unless the person was extra-extra neat and consistent in their writing, and even then it's a maybe.) 4. OCR on tabular data works best if the data is lined up in columns, and doesn't have random big gaps. 5. OCR will almost certainly be confused if there is a line on your map running through or near a word. 5a. Actually lines could confuse it quite a bit - I remember one that tried to recreate an in-line sketch map out of ascii characters. Quite amusing. 6. You *will* need to check the results. I'd love to hear what OCR makes of maps. Very curious. -ramon.___ Qgis-user mailing list Qgis-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/qgis-user ___ Qgis-user mailing list Qgis-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/qgis-user
Re: [Qgis-user] Raster to shape
The Grass toolbox appears inactive. The image that I georeferenced does not origin in Grass. It was an jpg image. I selected the layer with raster image, click in Grass plugin and the toolbox stay disabled. SIVORI SARTI DA SILVA - Mensagem Original - Data: Quarta-feira, 4 de Maio de 2011 01:40 De: Micha Silver < mi...@arava.co.il > Para: Sivori Sarti da Silva < siv...@daer.rs.gov.br > Cc: qgis-user@lists.osgeo.org Assunto: Re: [Qgis-user] Raster to shape On 05/03/2011 08:55 PM, Sivori Sarti da Silva wrote: Thanks, but in my grass plugin (QGis 1.6.0), this option are not available. At least I don't finding. I keep without solution. In the GRASS toolbox you should find r.to.vect.point as well as r.to.vect.line and r.to.vect.area. Go to the "Modules List" tab in the GRASS Toolbox, and type in the text line at the bottom of the window: "r.to.vect". You should then see all three. SIVORI Today's Topics: 1. Re: Export shapefiles to kml (Giovanni Manghi) 2. Raster em shape (Sivori Sarti da Silva) 3. Re: Raster em shape (Giovanni Manghi) Message: 2 Date: Tue, 3 May 2011 08:49:52 -0300 (GMT-03:00) From: Sivori Sarti da Silva < siv...@daer.rs.gov.br> Subject: [Qgis-user] Raster em shape To: qgis-user@lists.osgeo.org Message-ID: < 2121051134.88290.1304423392642.JavaMail.tomcat@solan> Content-Type: text/plain; charset="iso-8859-1" Olá, Alguém saberia me dizer qual ferramenta usar para transformar uma imagem raster em arquivo shape? Hi, Someone knows what tool to use for to transform an raster image in shape file? SIVORI Message: 3 Date: Tue, 03 May 2011 13:21:11 +0100 From: Giovanni Manghi < giovanni.man...@gmail.com> Subject: Re: [Qgis-user] Raster em shape To: Sivori Sarti da Silva < siv...@daer.rs.gov.br> Cc: qgis-user@lists.osgeo.org Message-ID: < 1304425271.1785.40.camel@sibirica> Content-Type: text/plain; charset="UTF-8" > Someone knows what tool to use for to transform an raster image in > shape file? use the GRASS plugin, then choose r.to.vect cheers -- Giovanni -- This mail was received via Mail-SeCure System. ___ Qgis-user mailing list Qgis-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/qgis-user This mail was received via Mail-SeCure System. -- Micha Silver Arava Development Co. +972-52-3665918 http://www.surfaces.co.il ___ Qgis-user mailing list Qgis-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/qgis-user
Re: [Qgis-user] Raster to shape
Please refer to the QGIS manual on how to start with GRASS. You'll need to create a location/mapset, import the raster in it and then use r.to.vect cheers -- Giovanni -- On Wed, 2011-05-04 at 16:07 -0300, Sivori Sarti da Silva wrote: > The Grass toolbox appears inactive. > The image that I georeferenced does not origin in Grass. It was an jpg > image. > I selected the layer with raster image, click in Grass plugin and the > toolbox stay disabled. > > > > SIVORI SARTI DA SILVA > > > - Mensagem Original >- > Data: > Quarta-feira, 4 de Maio de 2011 > 01:40 >De: > Micha Silver < mi...@arava.co.il > > Para: > Sivori Sarti da Silva < > siv...@daer.rs.gov.br > >Cc: > qgis-user@lists.osgeo.org > Assunto: > Re: [Qgis-user] Raster to shape > > > > On 05/03/2011 08:55 PM, > Sivori Sarti da Silva > wrote: > > > > Thanks, but in my > > grass plugin (QGis > > 1.6.0), this option > > are not available. > > At least I don't > > finding. > > I keep without > > solution. > > > > In the GRASS toolbox > you should find > r.to.vect.point as well > as r.to.vect.line and > r.to.vect.area. > Go to the "Modules > List" tab in the GRASS > Toolbox, and type in > the text line at the > bottom of the window: > "r.to.vect". You should > then see all three. > > > >SIVORI > > > > > > > > > > > > > > > > Today's > > Topics: > > > > 1. Re: > > Export > > shapefiles to kml (Giovanni Manghi) > > 2. > > Raster > > em > > shape > > (Sivori > > Sarti > > da > > Silva) > > 3. Re: > > Raster > > em > > shape > > (Giovanni Manghi) > > > > > > Message: 2 > > Date: > > Tue, 3 > > May > > 2011 > > 08:49:52 -0300 (GMT-03:00) > > From: > > Sivori > > Sarti > > da > > Silva < > > siv...@daer.rs.gov.br> > > Subject: [Qgis-user] Raster em shape > > To: > > qgis-user@lists.osgeo.org > > Message-ID: < 2121051134.88290.1304423392642.JavaMail.tomcat@solan> > > Content-Type: text/plain; charset="iso-8859-1" > > > > Olá, > > Alguém > > saberia > > me > > dizer > > qual > > ferramenta usar para transformar uma imagem raster em arquivo shape? > > > > Hi, > > Someone > > knows > > what > > tool to > > use for > > to > > transform an raster image in shape file? > > > > SIVORI > > > > > > > > > > Message: 3 > > Date: > > Tue, 03 > > May > > 2011 > > 13:21:11 +0100 > > From: > > Giovanni Manghi < giovanni.man...@gmail.com> > > Subject: Re: [Qgis-user] Raster em shape > > To: > > Sivori > > Sarti > > da > > Silva < > > siv...@daer.rs.gov.br> > > Cc: > > qgis-user@lists.osgeo.org > > Message-ID: < 1304425271.1785.40.camel@sibirica> > > Content-Type: text/plain; charset="UTF-8" > > > > > > > > > Someone > > knows > > what > > tool to > > use for > > to > > transform an raster image in > > > shape > > file? > > > > use the > > GRASS > > plugin, > > then > > choose > > r.to.vect > > > > > > cheers > > > > -- > > Giovanni -- > > > > > > > > > > > > This mail was > > received via > > Mail-SeCure System. > > > > ___ > > Qgis-user mailing list > > Qgis-user@lists.osgeo.org > > http://lists.osgeo.org/mailman/listinfo/qgis-user > > > > This mail was received via Mail-SeCure System. > > > > > > > -- > Micha Silver > Arava Development Co. +972-52-3665918 > http://www.surfaces.co.il > > ___ > Qgis-user mailing list > Qgis-user@lists.osgeo.org > http://lists.osgeo.org/mailman/listinfo/qgis-user ___ Qgis-user mailing list Qgis-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/qgis-user
[Qgis-user] QGIS + GRASS = Errors
Hi all - I'm running QGIS 1.6.0 and GRASS 6.4.1 and I'm getting weird errors when trying to run a few tools inside GRASS. I've imported an ESRI grid into GRASS without difficulty and can use some spatial analysis tools (slope, aspect, etc) but when I try to run r.shaded.relief or r.mapcalculator, I get the following warnings: "Cannot start Module r.shaded.relief command: C:/OSGeo4W/apps/grass/grass-6.4.1/bin/r.shaded.relief.bat --interface-- description My GRASS mapset is simple without spaces or long file names: C:/Projects/Scratch with my location called Chile and my mapset is Class. I've opened up r.shaded.relief.bat and it directs GRASS to the proper location in the scripts folder. I'm at my wits end trying to figure out why some spatial modules work and others do not (for example, the solar modules don't work either). Any thoughts, suggestions, solutions would be greatly appreciated. Thank you in advance for your help and time! cheers John http://osgeo-org.1803224.n2.nabble.com/file/n6332615/Error.jpg -- View this message in context: http://osgeo-org.1803224.n2.nabble.com/QGIS-GRASS-Errors-tp6332615p6332615.html Sent from the qgis-user mailing list archive at Nabble.com. ___ Qgis-user mailing list Qgis-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/qgis-user
Re: [Qgis-user] QGIS + GRASS = Errors
Hi, 2011/5/5 vanhoesenj : > "Cannot start Module r.shaded.relief command: > C:/OSGeo4W/apps/grass/grass-6.4.1/bin/r.shaded.relief.bat --interface-- > description wild guess, it should have be `--interface-description` not `--interface--description`. Martin -- Martin Landa * http://geo.fsv.cvut.cz/~landa ___ Qgis-user mailing list Qgis-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/qgis-user
[Qgis-user] road graph plugin: no starting point?
Hi all. I keep on getting "Start point not on the road" error. I tried different topology settings (up to 99, the maximum allowed), to no avail. Any hint? Thanks. -- Paolo Cavallini: http://www.faunalia.it/pc ___ Qgis-user mailing list Qgis-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/qgis-user
Re: [Qgis-user] road graph plugin: no starting point?
Hi. Thu, 05 May 2011 07:53:20 +0200 письмо от Paolo Cavallini : > Hi all. > I keep on getting "Start point not on the road" error. I tried different What set layer coordinate reference system, project CRS and 'on the fly transformation'? > topology settings (up to 99, the maximum allowed), to no avail. Topological tolerance does not affect the binding point. Topological tolerance is a distance between two nodes layer as one node a graph. You need to set topology tolerance if you see message "Can't find path", but not "Start point no on the road". > Any hint? > Thanks. > -- > Paolo Cavallini: http://www.faunalia.it/pc > > ___ > Qgis-user mailing list > Qgis-user@lists.osgeo.org > http://lists.osgeo.org/mailman/listinfo/qgis-user -- С уважением Якушев Сергей yakush...@list.ru ___ Qgis-user mailing list Qgis-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/qgis-user
Re: [Qgis-user] road graph plugin: no starting point?
Hi Paolo, In my experience the plugin only works with graphs in WGS84 (or any lat/lon system). And even then it's often a pain. Best wishes, Anita On Thu, May 5, 2011 at 7:53 AM, Paolo Cavallini wrote: > Hi all. > I keep on getting "Start point not on the road" error. I tried different > topology settings (up to 99, the maximum allowed), to no avail. > Any hint? > Thanks. > -- > Paolo Cavallini: http://www.faunalia.it/pc > > ___ > Qgis-user mailing list > Qgis-user@lists.osgeo.org > http://lists.osgeo.org/mailman/listinfo/qgis-user > ___ Qgis-user mailing list Qgis-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/qgis-user
[Qgis-user] Re: [GRASS-user] OCR
On Wed, May 4, 2011 at 11:18 AM, ALT SHN wrote: > Hello, > > This might seem a Little off topic, but maybe someone here can help me. > > I need to extract toponomical data from old digitized paper maps. I wish to > explore Optical character recognition (OCR). > > Does anyone has a suggestion/experience with this kind of challenge? You could try with this software: http://www.gnu.org/software/ocrad/ocrad.html Markus ___ Qgis-user mailing list Qgis-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/qgis-user
