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1h
comment Load USGS DRG into QGIS
UTM projection normally does not use lat_2, lon_1 and lon_2 parameters.
1d
comment gdalwarp reprojection causes missing data
You might have to clip the source so that the poles are excluded before reprojection.
2d
comment Put png map image as a background to draw upon
The Georeferencer offers you an icon labelled From map canvas. All you have to do is search for the point on the base map, and click on it (and set the CRS in Settings -> Transformation Settings to EPSG:3857 as well).
2d
comment Put png map image as a background to draw upon
It might help if you take the border points from the google map background to georeference. EPSG:3857 is correct for that. The city points might be the point of the fibre optic network switch, and not the town center.
Jun
29
comment Loading .shp file into QGIS gives error message
The .dbf is not mandatory (though unusual), but the index file .shx is necessary to load the data, see gis.stackexchange.com/questions/131132/… and gis.stackexchange.com/questions/7809/fixing-corrupt-shapefile
Jun
28
comment Is it better to take the elevation of a GPS unit or that of a Digital Elevation Model?
If you use a DEM, I suggest to take something better than SRTM data. Especially in mountain areas, SRTM has artefacts, and in city and forest areas you can not be sure if the data is top of building/tree or ground height.
Jun
26
comment Why does the Contour Plugin failt to load in QGIS Valmiera?
Have you tried to update to the current QGIS version 2.8.2? The plugin might not work with old QGIS versions anymore.
Jun
26
comment OpenStreetMap boundary relation lost when exporting to spatialite with ogr2ogr?
The boundary would go into the lines table if it was broken (i.e. not closed).
Jun
25
comment QGIS 2.8 OSM download with overpass fails
There is no limit published, but think of the file sizes at Geofabrik. You can not expect to get that amount out of a database over a web service On-the-fly. Uusally Overpass terminates after 25 seconds. The data size might be some Megabytes (uncompressed), but not Gigabytes.
Jun
25
comment Projections way off on data imported into QGIS?
To know which dataset is correctly placed, try setting the project CRS to EPSG:3857, add Google or Openstreetmap imagery with the openlayers plugin, then add your datasets. DON'T USE Set CRS for Layerfor reprojecting, but Save As ...
Jun
24
comment Cesium Terrain Builder : Could not open GDAL Dataset
You mention dem.tif, but the error message complains about missing dim.tif. Just a typo?
Jun
23
comment migrate an application under 1.6 to 2.8
These pages list a lot of changes for QGIS 2.0: hub.qgis.org/wiki/quantum-gis/API_changes_for_version_20 hub.qgis.org/wiki/17/Python_plugin_API_changes_from_18_to_20. You don't mention if your application is written in Python or C.
Jun
22
comment QGIS installed 2.8.1 but no 'File, Layer, Settings',
... but only if you hover with the mouse over it.
Jun
22
comment Why does QGIS Vector OpenStreetMap import lose features?
Add vector layer uses a spatialite database internally. You can save the layers to a new spatialite database. You may also use ogr2ogr to create a spatialite DB directly, see osgeo-org.1560.x6.nabble.com/OSM-data-gaps-td5204902.html for an example. For filtered data, I suggest to use the QUICKOSM plugin. This seems to work without data loss. You can get geojson or shapefile output.
Jun
22
comment How do i match Layers in QGIS
What Base map do you use, and are the coordinates in degrees or meters?
Jun
21
comment Offline Vector Tile Map for Android and iOS app
You can take a look at wiki.openstreetmap.org/wiki/Apple_iOS for iPhone solutions. Unfortunately I can not help you further on those devices.
Jun
20
comment Is there limit on size of GeoJSON files that can be handled by QGIS?
There might be an invalid geometry (or mixed geometry) in the 4k feautures you deleted. If you split the data into 5 files with 1K, do you get all features?
Jun
19
comment Is there any shapefile (or other format) of Russia's time zones after 2014 changes?
... but no time zone information.
Jun
19
comment QGIS 'Save As' Reprojection Produces Different Results from ogr2ogr command line
I don't see a difference in the latlon coordinates (except for rounding errors), and all three polygons fit nicely for me. Make sure that QGIS has added the layer with the right CRS definition. In some cases, it assigns EPSG:3395 where it should use EPSG:3857.
Jun
18
comment Offline Vector Tile Map for Android and iOS app
Have you tried Mapsforge?