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Sep
20
comment How to create contours from points where points are not a grid?
So the Processing Toolbox Model Contour Lines from Points will work in trunk, but how to constrain it to a polygon rather than a rectangular bounding box?
Sep
20
comment How to create contours from points where points are not a grid?
At first, I was overlooking a projection problem, but am trying Processing Toolbox Models Contour Lines from Points, but it hangs. This is typical of behaviour with the Contours plugin if the extent was too large. I don't see how to constrain the processing toolbox model tool to prevent this problem.
Sep
20
comment QGIS 2 problems with Plugins
The tool Add Delimited Text Layer is available directly from the Layer menu, the plugin is not required.
Sep
20
asked How to create contours from points where points are not a grid?
Sep
17
comment Problem in calculating length
So you are referring the shapefile to some other data. Is the other data properly referenced? You could compare all your data to what might be displayed by the Openlayers Plugin. Install that and see if the data is "real world" Also check to make sure that QGIS has On The Fly OTF projection turned on, it is accessed by an icon in the bottom right of the screen and will bring up a detailed dialog, on the top right of the dialog is a checkbox for OTF.
Sep
17
comment How to sample a raster using the Point Sampling Tool in QGIS 2.0?
Is there a projection problem between the CRS for your layer and the canvas?
Sep
17
comment how can i correct atmospherically landsat 8 images?
This may help gisagmaps.com/landsat-8-data-tutorial , a stop gap perhaps. It has the attraction of being able to be completed in QGIS, but is very sensitive to the selection of the haze parameters.
Sep
17
comment Problem in calculating length
So what base information are you working from? I suspect that is the problem. Was the primary data imported somehow?
Sep
17
comment Problem in calculating length
SAVE AS the shapefile, in that dialog, choose to use a specific projection. So WGS84 UTM44N EPSG:32644 should be metres. spatialreference.org/ref/epsg/32644
Sep
17
answered Problem in calculating length
Sep
17
answered OSGeo4W and QGIS 2.0
Sep
16
comment how to set width & height of a polygon in QGIS
Use the tab key to move between the fields, toggle the locks off and on with the spacebar on the keyboard. That way you can leave the mouse on the canvas. Shift-tab reverses the movement of the selector on the fields.
Sep
16
comment how to set width & height of a polygon in QGIS
Once you start using this tool, you will see it can have the length and angle locked to create specific dimensions. So if you lock 1 m and 90 deg, it should go around in a square. You can use negative values. (Is this like an orthogonal traverse?) Note the deg field can be toggled for canvas or relative angles. Also, all this works better for me if the layer is in a grid/UTM coordinate system and if the canvas is in grid/UTM system.
Sep
16
answered How to find out whether a photo is geotagged or not?
Sep
16
answered how to set width & height of a polygon in QGIS
Sep
13
answered How to derive soil water holding capacity from Landsat data
Sep
5
answered Select features from attribute table and then create a new field with the selected attribute data
Sep
5
comment Broadband coverage GIF image layer needs to be selectable (ArcGIS)
How extensive is the analysis, i.e. will you repeat the interrogation of the map a few times, once, automatically? Also, most types of analysis like this are done where the boundary layer is a vector, your gif layer is a raster. You might like to look at converting the raster to a vector which will be simpler if the image has distinct features and colours.
Sep
5
comment QGIS for Mac: How to restore menu bar and tool bar in print composer
Happened to me before, also others gis.stackexchange.com/questions/38862/… gis.stackexchange.com/questions/40674/…
Aug
30
comment Problems with scale bar units in qgis composer
The problem in the composer with offset layers may not be apparent until you output the pdf.