QGIS is a user-friendly, cross-platform GIS application licensed under the GNU General Public License.

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297 views

QGIS - adding timestamps to spatialite data during data collection

I am trying to do field data collection using QGIS. One of the features that I regard as necessary for data management is timestamps. For example, a timestamp can indicate that an inspection record ...
6
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1answer
704 views

Is SpatiaLite or SQLite Spatial an Accepted Standard?

The reason why I ask this is because I have been undertaking some testing and have found that there seems to be many implementation and not all of them are interchangeable. For example: FME can read ...
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1answer
4k views

How can I convert/transform coordinates from ETRS89 to WGS84 Utm 36N in QGis

I am a student and just getting to know qgis. At the momment I have to combine data which had been measured in ETRS89 with data in WGS84 UTM 36N. I created several vektorlayers for the data in ETRS89. ...
2
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2answers
114 views

How to adjust raster size for usage in raster calculator?

I want to make a visibility analysis of planned wind turbines in my region. I have a DEM raster and a polygon describing the possible area where the wind turbines might be set up. People are ...
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0answers
62 views

detect signal where delete polygon in qgis?

I am working with QGIS and i want when i delete a polygon and then i commit this action I detect the signal of this operation and use it in python script, I tryed this but dont work: def delete(): ...
3
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2answers
1k views

How to set proportional value in legend?

I have a GIS table with traffic flows.The thickness is proportional to the traffic value and I'd like to have a little legend with 3 links proportional to setted value (eg: link1 proportional to 100 ...
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1answer
243 views

PostgreSQL/GIS table relations in QGIS 1.8.0

I am building a database in PostgreSQL 9.2 with the PostGIS 2.0 extension. The database consists of a schema called Water which contains water related geographic features (as example, boreholes and ...
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1answer
153 views

How to make a Marker moving along the line in QGIS?

I have some questions about simulator moving on the QGIS map. On a vector layer, selected some points to make a polyline, and, let a Vertex Marker moving along the polyline. Now, I want to moving the ...
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1answer
130 views

connect signal to function with arguments

Hello I have this function on python that take 2 arguments: def niveau(controName,idNiveau): ........ I want to connect it to this signal: ...
2
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1answer
208 views

How many active QGIS users are there in total?

I'm the CEO of MangoMap which is a online GIS data management and web map publication platform, we're big QGIS fans and make extensive use of it. We would really love to integrate MangoMap more ...
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1answer
180 views

What is the correct coordinate system for google geocoded text file layers?

When importing a text file containing lat/longs geocoded from something like GPSVisualizer.com into QGIS, what is the correct coordinate system to select? Most web services (GpsVisualizer included) ...
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0answers
121 views

Can QGIS Measure Line tool compute correct geodetic distance?

As I understood, this tool normally shows distance in the project CRS units, not the geodetic meters (despite it actually says the distance is in meters). However, now I read (Section III, 4 - ...
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0answers
112 views

Can extracting raster values work in polygons' CRS without raster resampling?

I am trying to extract raster values using polygon layer with different CRS. Raster is in WGS84 (EPSG:4326) and the polygons in UTM (EPSG:23031). 1. If I want to work in the projection of the ...
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1answer
184 views

Sum of values within a buffer polygon

I need to do the following in QGIS and hope so much anyone could help. I have a vector layer with points. Each point represents a firm with the number of employees in the attribute table. I want to ...
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1answer
204 views

Define transparent color in singleband pseudocolor raster layer style

Can I somehow define "transparent" color for values higher than 32000 in raster layer? See the style dialog:
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0answers
141 views

How do I edit a shapefile DBF to repair an extra row?

Something got screwed up and now the rows of my DBF beyond #1210 are offset by one, meaning that each shape has the attributes that should be assigned to the next shape. If I were in a spreadsheet ...
4
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1answer
2k views

How do you import a .SHP into Sketch-Up?

Does anyone know how to use a .SHP in Trimble Sketch-Up? I have tried exporting to KML and CAD from QGIS, but the KML file doesn't read in Sketch-Up. Thanks! -m
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0answers
44 views

How can I import layers into a database?

According to the QGIS User Guide (release 1.8.0, page 203/204) I only have to drag a layer from the QGIS Browser to the DB Manager. But for me this does not work.
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4answers
205 views

Buffer in QGIS/R is 650-670 m wide instead of 500 m

I am trying to make a 500 m buffer for my polyline layer. Unexpectedly, I receive buffer varying from 650 to 670 m, depending on location. As many resources recommend to use UTM before making a ...
4
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1answer
331 views

QGis Zonal Statistics Plugin NoData included in Calculations

I have been trying to use the QGIS zonal statistics plugin. My raster has a nodata value of -99999 and all other values are positive. After computing the mean zonal statistics there are a number of ...
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1answer
266 views

QSpatialite : import multiple TXT/CSV

I'm using QSpatialite only. I don't have spatialite-gui neither the shell. I want to import multiple TXT/CSV at one time. How is it possible to do that ? I found nothing on the internet. Thanks
2
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1answer
436 views

How to align (georeference) images using QGIS?

I'm completely new to all this. I'm trying to make a map of Han dynasty-era China for a mod for a game called Crusader Kings 2. I've downloaded QGIS and Natural Earth 2, but I need this image to ...
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2answers
147 views

Exporting raster data from QGIS in chosen projection

EDIT: it is seeming like some of the time my last method will lead to a correct projection, some of the time it will not. Unsure what's happening there but at least trial and error will get me ...
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0answers
50 views

Vector grid out of range

I'm working with QGIS 1.8.0 trying to do some vector grid to a map. This shapefile (the original is a zip and has the following files .dbf, .prj, .sbn, .sbx, .shp, .shx) has some strange CRS and I ...
3
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1answer
237 views

What's the unit of measurements produced by “sum line lengths”?

My goal is to find the total length of roads per county for a particular state. You would think there would be a simple government spreadsheet with this information in it.... I cannot figure out how ...
2
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1answer
134 views

Looking for a tool that will place the cursor to a specific x,y coordinate

I am a new user to Quantum GIS. I am looking for a tool/function that will allow a user to type in coordinates, and place the cursor on that exact position. This is for navigation in the field... ...
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0answers
25 views

Dwg to shp in Geoserver [duplicate]

I am trying to load dwg in geoserver and show it in openlayers, so I saved the dwg as dxf with autocad. Then I used qgis to save the dxf as shp. But when I am trying to load the shp with geoserver ...
3
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1answer
150 views

How to select all multipoint features from a point layer?

I'm connecting to WFS layer by qgis. On some layer I've got points features and few multi-point features. Whole layer contains about 1000 features, how can I do some query just to know which features ...
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1answer
48 views

Sampling from interpolated data layer

Im working with QGIS 1.8.0 and wanted to ask you how can I assign to each of the small squares of the map (I have the coordinates of the center each of them) values from an interpolated data layer as ...
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1answer
533 views

QGIS python - reference a layer in the table of contents

I'm trying to create a plugin for QGIS using python, But need some help. I want to 1.Zoom to a layer and 2. make the layer visible(switch off or on). But I have managed to zoom to an active layer by ...
2
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2answers
2k views

How to draw bar diagrams on the map?

I need to draw simple histograms in QGIS version 1.8 from an imported DB. I need a double bar diagrams (eg: male/female - in/out) but I only find the possibility to set pie charts. Is it possible to ...
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1answer
107 views

How can I mosaic raster data which have different number of bands ( 3 and 4)?

I would like to mosaic 100 raster data. several raster data's band are 3, though last data have 4 bands. How can I mosaic raster data which have different number of bands?? If somebody knows how to ...
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0answers
522 views

Why can't QGIS connect to MS SQL Server?

All, Up until yesterday, QGIS connected to my SQL Server 2012 database no problem. However, yesterday I installed SQL Server Management Studio (SSMS), and the SQL Server Client tools, and now I get ...
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0answers
124 views

Convert shape file to KML on QGIS

I want to convert a shapefile to a kml using QGIS. When I do it, the output I obtain is without atributtes. And I want a similar product as it is provided by shape2kml of zonum solutions. Thanks in ...
3
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1answer
190 views

Divide shapefile

I'm new working with QGIS 1.8.0 and wanted to know if its possible to subdivide a map (shapefile, which is round-like) into small squares but following the outer round contour of the map? I tried with ...
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0answers
442 views

How can I create new shapefile in QGIS1.8 from “Save selection as…”

when select a shapefile feature from census boundary file and use "save selection as" to create a new shapefile, program returns error: "Export to vector file failed. Error: creation of layer failed ...
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0answers
54 views

Moving legend items up and down in QGIS

How can I change sort order in layer properties styles tab? The only way I've found is to change their labels and order by it.
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1answer
50 views

How to work around “OGR-failure while deleting field 13. Invalid field index”?

this post might be related to this one: QGIS Field Calculator Results Removed When Saving Edits But there is no suitable answer for me It is not allowed to ask another time in the other post I ...
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1answer
59 views

Move shared vertices together

I should move some vertices of a polygon to fix the boundaries of a country, how can I do it while keeping the adjacent polygons still connected? Is there a way to anchor permanently overlapped ...
1
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1answer
117 views

Add buffer only on one specific side of polygons

I have a shapefile with multipart geometry (multipolygons), namely communities (blue on the picture below). There are also lakes (white), but for these I don't have a geometry, they're just "empty". ...
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2answers
307 views

How to best set up QGIS for GDA 94 zone 55 (Australia)

I am looking for help on the best way to set up QGIS for GDA 94 zone 55. (i.e. all the relevant settings etc.)[1.8 in lieu of 2.0] Am working off Garmin GPS/gpx data in GDA/UTM format (I accss this ...
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0answers
92 views

QGIS GPS bluetooth connection

I have setup a Haicom bluetooth gps on a machine running Windows8 and have used GPSGate to create some virtual COM ports. I have valid data arriving at the COM port, but then I run QGIS and try to ...
2
votes
2answers
975 views

Local Tile Cache in QGIS

I was wondering if there is a way to load a local tile cache (ie: MB Tiles etc.) of imagery that is sitting locally into QGIS? I am hoping to use some tablets for field verification and would like to ...
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0answers
74 views

QGis Cloud Real Time Data

Through Qgis 1.8 i have a layer whose data are updated every 3 seconds.But the question is whether it is possible that QGis Cloud represents dynamically these changes. Thank you very much
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1answer
3k views

How do I import AutoCAD [DWG] drawings to QGIS [SHP] using the right CRS settings?

We did some topographical surveys in Indonesia which are drawn in AutoCAD. It's our aim to publish them with QGIS and its webclient. I thought the best way is to georeference the data in AutoCAD ...
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1answer
82 views

Stop custom attribute form from resizing in Qgis

When I open a custom attribute form for a feature in Qgis it always gets resized to the default size of the original Qgis attribute form. I've tried to set the sizePolicy in QT Designer to Fixed ...
2
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1answer
295 views

How to add a layer group using pyQGIS?

Good morning, I would like to know how I can create a new group in the layer manager using python code, someone could help me?
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0answers
36 views

HTML framework in GIS development version

I have a question. I need to insert an HTML frame in the QGIS developer version. That works very well. Now I will also create a title page as HTML. Now my question is which program I best create the ...
2
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3answers
319 views

Extrude Shapefile to KML based on field value

I would like to extrude shapefile polygons to a KML based on a value stored in the attribute table. I am hoping to do this using open source software (QGIS, FWTools, GDAL, etc.). I looked at ogr2ogr ...
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1answer
241 views

How can I open georeferenced ArcMap raster files in Qgis?

How can I open georeferenced arcmap raster files in Qgis?