I have just started using QGIS. I've loaded the "openlayers" plugin and added a google hybrid layer, which is based off the WGS84 datum to my understanding. Now I create a shapefile and add a new line vector layer based on the same datum. I draw a line and then zoom out. Now, the line has moved with regards to the google map (i'm drawing a road and now the road no longer lines up with the original road I'm using for a guide).   My end goal is to make a georeferenced shapefile with some roads. Is my methodology flawed or is their a problem with my plugin (assuming the former of course!)?
56060
I am trying to digitize OpenLayers data (such as Google satellite imagery) with no success. Whenever I try to move or zoom the canvas the vector layer I digitized loses the position relative to the imagery.  I have read about this problem elsewhere but was not able to find a solution.  Does anyone have a solution as to how I can digitize satellite imagery for free in QGIS?
121131
I have added vector layer to map:      vactorTest = new OpenLayers.Layer.Vector("Editable Features", { strategies: [new OpenLayers.Strategy.BBOX(), saveStrategy], projection: new OpenLayers.Projection("EPSG:900913"), protocol: new OpenLayers.Protocol.WFS({     srsName: "EPSG:900913", url: "http://localhost:8080/geoserver/wfs", featureType: "ROADS", featureNS: "http://localhost:8080/MIA", featurePrefix: "MIA", geometryName: "GEOM", version: "1.1.0" }) });  map.addLayer(vactorTest);   And then, added polygon draw control:  var drawPolygon = new OpenLayers.Control.DrawFeature( vactorTest, OpenLayers.Handler.Polygon, { title: "Draw Polygon", displayClass: "olControlDrawFeaturePolygon", multi: true } );   with drawn polygon I want to filter layer:  testLayer.mergeNewParams({     "CQL_FILTER": mergeFilter });   I use within filter:   WITHIN(GEOM, POLYGON((4693721.49445 672633.89194, 4560244.10812 322255.75282, 4703732.29843 422363.79257, 4693721.49445 672633.89194)))   target layer is in Georgia, and if I draw polygon near Italy then, filter works.  How can I change vector projection like my layer to get right result?
94104
We're running MapServer with a map that has just one layer, political boundaries from a SHP file.  This layer is using a basic EPSG:4326 projection, and the map itself is using EPSG:3857.  The resulting images generated by MapServer CGI queries have horizontal lines at certain latitudes:    Beyond this problem, the map is okay and lines up perfectly with the Open Street Map in OpenLayers.  The MAPFILE we're using:   MAP   WEB           METADATA         "wms_title" "Map Server"         "wms_enable_request"  "*"         "wms_srs"             "EPSG:3857"            END   END    PROJECTION     "init=epsg:3857"   END    IMAGETYPE      PNG   EXTENT -20037508.34 -20037508.34 20037508.34 20037508.34   SIZE           400 300   SHAPEPATH      "../data"   IMAGECOLOR     71 245 242    LAYER # States polygon layer begins here     NAME         Borders     DATA         ne_10m_admin_1_states_provinces_shp     STATUS       OFF     TYPE         POLYGON    PROJECTION     "init=epsg:4326"    END      CLASS       NAME       "Borders"        STYLE         COLOR        43 156 51         OUTLINECOLOR 32 32 32       END     END   END # States polygon layer ends here  END    I've verified that the proj.4 EPSG file has the proper definition of EPSG:3857, and don't understand what's happening.  Any insight would be greatly appreciated.
110545
I do have two vector layer, of which one is a point layer based on "events" by remote sensing and the second one is a line layer from local research.   In my case these are earthquakes and tectonic faults, but I guess one could simply choose "car-accidents and roads" as a general example.  So what I'd like to do is move/copy the points onto the closest point of the lines, as long as its within a tolerance distance (say 1-2km or 0.0xx°), with the new point layer (+attr moved y/n).  Any ideas ?  Linux, QGIS 1.8
77465
I'm a bit of a novice with QGIS, so this is really throwing me for a loop.  For the maps I'm intending on making, an azimuthal orthographic projection would be my preference.   For example, one map I'm trying to recreate is this map of the Pacific islands :    I've been using the NaturalEarth Quick Start package, which has been a really good launching-off point, but I'm running into some issues at the horizon of the orthographic projection.  I've tried adding a custom projection:  +proj=ortho +lat_0=0 +lon_0=170 +x_0=0 +y_0=0 +a=6371000 +b=6371000 +units=m +no_defs   But that gives the following map:    Which certainly is close to being right, but the ocean is obviously being cut off in the Arctic and on the southern horizon.  I understand the issue is that naively mapping layers described in WGS 84 to an orthographic projection leaves you with artifacts at the horizon, but how do I fix it?    I first tried to use the Clip to Hemisphere plugin described in , but it seems incompatible with QGIS 3; when I try adding the plugin, QGIS3 gives an error message and places it in the "Invalid" section of the Plugins window.    I then tried both solutions presented at  Again the issue is with QGIS 2/3 incompatibility.    For Solution 1, both Numerical Digitize and CAD Tools are again incompatible with QGIS 3 and give the same result as Clip to Hemisphere.    For Solution 2, I can't disable on-the-fly-reprojection in settings since that setting was removed in QGIS 3.
71893
So I'm pretty new to GIS, and I'm working on a mapping project using data for Vancouver, Canada. I want to combine OpenStreetMap data along with data provided by the City of Vancouver. But the City data don't line up with the OSM data when I map them in QGIS.  Following the advice of an answer to , I checked the two data sources against a third (a map of the world). The OSM data is right -- British Columbia is in the right spot -- but the City data puts Vancouver in the south of France.   My data sources are:   Bikeways and libraries . (Both are SHP files.) These are the data that don't align with the others. A map of British Columbia from Open Street Map. I put the data into a database using osm2pgsql. A world map that's part of the Open Street Style project.    Projections:   The City data are projected in UTM zone10, NAD83 (CSRS). I've selected this in QGIS's Layer Properties screen for those layers. Projection string: +proj=utm +zone=5 +ellps=GRS80 +datum=NAD83 +units=m +no_defs The OSM maps are in Mercator projection. QGIS has many Mercator choices, and I wasn't sure which one to use, so I guessed "Popular Visualization CRS / Mercator". +proj=merc +lon_0=0 +k=1 +x_0=0 +y_0=0 +a=6378137 +b=6378137 +towgs84=0,0,0,0,0,0,0 +units=m +no_defs For the world map, Quantum GIS loaded the projection from the .prj file. That's +proj=merc +a=6378137 +b=6378137 +lat_ts=0.0 +lon_0=0.0 +x_0=0.0 +y_0=0 +k=1.0 +units=m +nadgrids=@null +wktext +over +no_defs    talks about zone problems. That sounds like what I might be experienceing. So I tried changing the libraries from UTM zone 10N to other zones (15N and 60N) but nothing changed.  Does anyone have suggestions for what to try next?
47055
I have a shapefile of city streets. I tried to run the Road Graph tool on them but the select box does not populate with the layer. I ran the Topology Checker on the layer and found that there are 2,000 pseudo nodes. I then ran the Dissolve tool on them and reduced the number to about 700 (these are pseudo nodes that are not in straight line segments in the layer).   I have also tried importing to GRASS, which fixes topology errors, but the layer results do not display on the map. Don't know why, tried several times.  Any suggestions for getting rid of all of these pseudo nodes in QGIS? I'm using QGIS 2.4, Chugiak.  This link:     ...describes pseudo nodes as  The definition of Pseudo node is "Pseudo nodes occur where a single line connects with itself or where only two Polylines intersect."  In QGIS, they look like points on the lines between legitimate intersecting nodes.
5172
I'm hoping someone out there might be able to help or suggest some tests to try and resolve some very odd QGIS behaviour of late...  Our core GIS team of 4 users has been testing v2.10 prior to roll-out for the remainder of the organization.  In the past couple of weeks we have had some very odd shapefile corruption things happening and are yet to isolate or identify a potential cause...  These have included:   Editing one line (using the scissor tool to split into two records) and having the resulting records attributes completely replaced by attributes from another geometry no-where near the edited row (spatially or in the attribute dbf) Line geometries completely disappear while their attributes get associated with an unrelated geometry  Line geometry get partially deleted and replaced with a vertice in infinity (line visually extends beyond the dataset and no matter how far zoomed out you never see the end)   The above is happening in a polyline layer, that we did discover has some multi-line geometries..? Perhaps this is impacting... but never saw this issue with v2.8 and the same layer. The layer has undergone MANY save-as's in the past week and many verify geometry checks as we thought invalid geometry may have been the cause...  In another separate layer yesterday, to a separate user (me) i created a layer with approx 30 polygons... adding, deleting some and doing some 'avoid intersection' to remove overlaps. Layer looks fine in qgis, saved and also a save-as to a completely new file but when i load into ArcGIS online (and later is ArcMap as a test) some of the overlaps and deleted objects are still there. Close and reopen qgis,  reopen the file and they are definitely not.  The project was created in v2.8 that i was editing in (but had been saved in 2.10).  Does anyone have any ideas/suggestions.  We do still have 2.8 installed as well as 2.10? We have never encountered issues like this when testing other new qgis versions while still running old ones?
80064
I use QGIS 2.18.5 and I get in stuck with two polygons I cannot solve.  I want to make a new polygon from these two which looks like this:  I made thew new one: Cut 1 polygon and paste to other layer. Used polygon to lines toolbox then explode lines, then deleted the lines which do not needed then used the add feature to connect lines. Last I dissolve new lines then convert lines to polygons. The new polygon looks like that I wanted to get in QGIS but when I use wayline converter which convert polygons to my tractor GPS it is only shows one polygon:  What could be the problem?  Look I deleted the line I do not need.  When I select Vertex Tool it appears the line I deleted earlier.  I think this is the main problem but I do not know how to remote it well..   I found it but is is not the result I wanted to get. :D Look I want to this from 2 Polygons: I want that new polygons that is circled with red:  After used the Minimum Bounding as Minimum Oriented Rectangle I got this:
75877
I am using  maps to create a representation of a round-the-world challenge. I would like to add a polyline which heads east from tokyo and then appears west of south america on the map - but instead I get a line which crosses the map in the opposite direction (see yellow line).    I think this is probably related to datelines and /or coordinate systems but am a bit sketchy on the detail. Can anyone explain the theory behind what I need to do to get this to work? I am using the bluemarble projection from Nasa:  var bluemarble = new L.TileLayer.WMS("http://demo.opengeo.org/geoserver/wms", { layers: 'bluemarble', attribution: "Data &amp;copy; NASA Blue Marble, image service by OpenGeo", minZoom: 2, maxZoom: 5 });
62408
I can't find OpenLayers Plugin to install in QGIS 3.6.  I want to open Google Earth in order to add coordinates and open satellite image to start mapping.
86909
I am in QGIS. I have a raster layer of mountains and a lake. I have a vector layer (shapefile) of the lake. It sits nicely where it supposed to be over the raster level. I am going to convert this height map to an STL so that I can cnc this out of wood, so I'd like the actual lake to be something like 200 feet lower than it shows on the raster layer so that I can fill it with blue epoxy. I have read a lot of clipping and everything else, and I am lost.
119456
I asked this question once before, but I did not receive any feedback on solving on the issue and I am still confused as to what I am doing wrong.  I found a public domain map of Florida counties on Google. All I want to do is add coordinate points from a cvs file to the map. It should be simple, right? Apparently not. I made a cvs file with latitude/ longitude and x,y coordinates, but the points do not line up with the map. Yes, I DID have the same projection for both layers. The counties map had a projection of EPSG 2237, NAD 83/ Florida West (ftUS), so I changed the cvs file to have that same exact projection. I also made negative values for the longitude coordinates for United States. I tried this with various Florida maps to see if the counties map I found was just wrong, but every map I tried had the same issue. I tried various types of x and y coordinates for the points, and nothing was better. This really should be a simple thing to do, so I really would like to know what I'm doing wrong.
47883
I am having serious problems in exporting a map (Google satellite map) linked to QGIS.   Using the print editor I clearly see the part of the map I want to print and also in the right scale, but when I save it as jpeg, the result is: the correct map in a circle in the middle of the page, and all around it seems that Qgis is zooming at different scale on another part of the map [see attached file].  Any suggestion about it ? I don't want to save it as simple screenshot  because I need an HD file.   ]
94444
I'm new to QGIS. In my project i have two layers: one is my vector (city boundaries) and the other is the OSM (obtained with the plugin). How can I cut the OSM along the edges of the vector? I want to obtain only a region of the map, to save it as an image.
108131
I am quite new to QGIS.   I wanted to test if Google Earth and QGIS distance measurement tools are actually getting the same results. Turns out, they don't -at least not in my case.  I'm pretty sure the project CRS (Stockholm, Sweden) is the right one - and I guess Google is always right (!)?  The CRS is SWEREF99 18 00, EPSG::3011 (OTF).  Method:   DRAWING LINE: new layer -> draw line MEASURING in QGIS: attribute table -> field calc -> $Length/1000* EXPORT TO GOOGLE EARTH: save layer as.. -> KML-file (aware of correct CRS) MEASURING in GOOGLE EARTH: import KML-file -> measure manually w/ GEarth measurement tool   (please look at the picture to see how different they measure 3 different lines, *= I've seen this in several tutorials)  So, my question is either;  1) Which measurement should I trust - QGIS or Google EArth?  and/or  2) How do I get QGIS to measure correctly?
4171
I have a CSV with an address field (no lat/long), so I went to Google My Maps, imported the csv and geocoded of the records.  Now I export the layer as KML and added the KML to QGIS and Google Earth Pro, but in non of them I can see the markers. In fact in QGIS, the KML layer is added as datatable (no geometry).  What's happening? How can I export a geometry layer from google My Maps?