<html><head><style type="text/css"><!-- DIV {margin:0px;} --></style></head><body><div style="font-family:times new roman,new york,times,serif;font-size:12pt">Hello Ernesto,<br>thank you very much for this good set of layers. Maybe we can also use them to test the topology extension [1], [2].<br>I think, it is really interesting what you are proposing here with specific data and workflows. You are probably the best person to coordinate this working group. I would like to join this group if you could coordinate us. Is it ok for you?<br>Do we have a web platform where we could document our results and look into the matter ourselves? Maybe we can use a google.doc to work together on this? We will give later our results to the project.<br>Nice to hear from you.<br>José<br><br><span>[1] <a target="_blank" href="http://www.gvsig.org/web/projects/gvsig-desktop/devel">http://www.gvsig.org/web/projects/gvsig-desktop/devel</a></span><br><span>[2] <a
target="_blank" href="http://www.gvsig.org/web/projects/gvsig-desktop/docs/user/ext/topologia/topologia-0-1.0/topology-0-1-0/view?set_language=en">http://www.gvsig.org/web/projects/gvsig-desktop/docs/user/ext/topologia/topologia-0-1.0/topology-0-1-0/view?set_language=en</a></span><br><div> </div>--<br>José Antonio Canalejo Alonso<br><span><a target="_blank" href="http://www.csgis.de">http://www.csgis.de</a></span><div><br></div><div style="font-family: times new roman,new york,times,serif; font-size: 12pt;"><br><div style="font-family: arial,helvetica,sans-serif; font-size: 10pt;"><font face="Tahoma" size="2"><hr size="1"><b><span style="font-weight: bold;">De:</span></b> ernesto sferlazza <e.sferlazza@gmail.com><br><b><span style="font-weight: bold;">Para:</span></b> gvsig_internacional@listserv.gva.es; martinez_lucpal@gva.es<br><b><span style="font-weight: bold;">Enviado:</span></b> vie,20 mayo, 2011 14:07<br><b><span style="font-weight:
bold;">Asunto:</span></b> Re: [Gvsig_english] spatial query rules in Selection by layer tool<br></font><br>> From: Luc?a Mart?nez <<a ymailto="mailto:martinez_lucpal@gva.es" href="mailto:martinez_lucpal@gva.es">martinez_lucpal@gva.es</a>><br>> Hello Ernesto,<br>> I was also testing every option of the tool.<br>> I am afraid but we do not have enough documentation to determine the<br>> exact behavior of some of the options.<br>> As you say, they may need some adjustments.<br><br><br>Hello, I have created a set of layers almost complete, suitable to<br>perform tests on topological rules used in spatial query, implemented<br>in ArcGIS Desktop and in gvSIG.<br>The layers can be downloaded from url [1].<br><br>[1] <a href="http://sit.provincia.agrigento.it/scaricabili/temp/" target="_blank">http://sit.provincia.agrigento.it/scaricabili/temp/</a><br><br>The names of the layers are self explanatory (I hope): inputLines,<br>inputPolygons
and inputPoints are the layers from which we want to<br>select features performing the spatial query; maskPoints, maskLines<br>and maskPolygons are the layers where we select features to be used as<br>comparison (example: select features from layer inputPolygons that<br>INTERSECT WITH selected features from layer maskLines).<br><br>The input theme's attribute table contains, among the other, fields<br>R1, R2, ... , R32. From R1 to R13 they refer to the following ArcGIS<br>Desktop rules:<br><br>R1 = intersect<br>R2 = are within a distance of<br>R3 = contain<br>R4 = completely contain<br>R5 = contain (Clementini)<br>R6 = are identical to<br>R7 = touch the boundary of<br>R8 = share a line segment with<br>R9 = are crossed by the outline of<br>R10= have their centroid in<br>R11= are within<br>R12= are completely within<br>R13= are within (Clementini)<br><br>From R14 to R21 fields refer to the following gvSIG rules:<br>R14 = are the same as<br>R15 = are
disjoint from<br>R16 = intersect with<br>R17 = touch<br>R18 = cross over<br>R19 = contain<br>R20 = are contained in<br>R21 = are on the top of<br><br>The other fields refer to the rules implemented in AdB-Toolbox<br>(developed from OpenJump), but I have not yet tested rules for this<br>software.<br><br>The meaning of the value for each rule is:<br>1: the feature from the input layer is selected when the rule is applied;<br>0: the feature from the input layer is NOT selected when the rule is applied;<br>9: depends on effective value of distance specified (i.e, not tested<br>for rule R2)<br>-99: the rule cannot be applied for the geometries involved in the<br>comparison (for example polygons cannot be contained in points or<br>in polylines).<br>The values have been obtained using the test I have performed on data,<br>therefore they are liable to contain mistakes.<br><br>I have found sometimes a strange or senseless behaviour applying
some<br>of the rules implemented in gvSIG, so that actually I think that<br>spatial query in gvSIG is not yet quite reliable.<br>Developers and volunteers can perform their own tests to verify or to<br>rebut my assertions.<br>The data can be used to improve documentation, too.<br>Best regards<br><br>--<br>ing. Ernesto Sferlazza<br>responsabile nodo provinciale di Agrigento del SITR Sicilia<br>resp. gruppo Sistema Informativo Territoriale<br>Provincia regionale di Agrigento<br>sede istituzionale: piazza Aldo Moro, 1 - 92100 AGRIGENTO<br>sede operativa: via Acrone, 27 - 92100 AGRIGENTO<br>cell. 3392718463 (personale)<br> 3316874296 (aziendale)<br>tel. uff 0922593752<br>_______________________________________________<br>Gvsig_internacional mailing list<br><a ymailto="mailto:Gvsig_internacional@listserv.gva.es" href="mailto:Gvsig_internacional@listserv.gva.es">Gvsig_internacional@listserv.gva.es</a><br><a
href="http://listserv.gva.es/cgi-bin/mailman/listinfo/gvsig_internacional" target="_blank">http://listserv.gva.es/cgi-bin/mailman/listinfo/gvsig_internacional</a><br></div></div>
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