796 reputation
615
bio website
location Potsdam, Germany
age 30
visits member for 4 years
seen 22 hours ago

Studied Geography at the University of Bayreuth, Germany and Urban Planning at the University of Delaware, USA. Now working as an urban planner for a mid-sized municipality near Berlin after a couple of years of freelance work.


Jul
7
comment Invalid geometry
Clicking on the error message in QGIS' topology checker will bring you to the potentially problematic vertex or line. Do any problems show up when you check manually(most probably zero-length lines or overlapping geometry)? I can also imagine that ArcGIs and QGIS topology use different tolerance values (in this case, QGIS would have narrower ones...)
Jul
2
comment Where can i find Shapefiles of city along with the world file (.jgw) and the jpg image?
Well an algorithm able to identify building footprints from aerial pictures would be nifty, especially for us in e.g. OSM. And better wait 'till somebody else chimes in, too, just because I don't find any free test data doesn't mean there isn't any.
Jul
2
comment Where can i find Shapefiles of city along with the world file (.jgw) and the jpg image?
So you want to test your digitizing algorithm and then compare the results with the actual cadastral map? Will WMS services do the trick for you? Or maybe QGIS' OpenLayers plugin? I don't think you will find any freely available aerial picture tiles in your needed resolution (below 20 cm, I guess) online. As for free shapefile cadastral data - that's gonna be tough. All free example data I could find doesn't use the same area for their cadastral and aerial picture showcases...
Jul
2
comment Width and distance when using line patterns in QGIS
I think his problem is that the resulting crosshatch pattern is not recognizable in QGIS - I just tried his values, it's the same for me... (see above)
Jul
2
comment Width and distance when using line patterns in QGIS
EDIT: I just tried to print a 0,1mm/0,8mm crosshatch pattern from my CAD - it's barely readable. there is a reason the smallest line width is usually 0,18 mm ;).
Jul
2
comment Width and distance when using line patterns in QGIS
Well, the example you are linking is more like 1,2 mm distance and probably 0,25 mm line width. If you use those values the resulting pattern will look much closer to your example.
Jul
2
comment Where can i find Shapefiles of city along with the world file (.jgw) and the jpg image?
I don't think such a repository exists. Cadastral maps aren't usually publicly available, especially not as shape files. The same is true for aerial pictures. Which city are we talking about?
Jun
30
comment How to exactly georeference in QGIS
@simskopf: Then you might want to accept Jakob's hint as the correct answer. ;)
Jun
30
comment How to exactly georeference in QGIS
Well, you need to do that if the raster image and the reference data aren't in the same projection. Linear only tries to move the image to the correct location without transforming ("warping") it.
Jun
26
answered How to place labels under a vector layer?
Jun
25
comment How to place labels under a vector layer?
I could imagine that user8839 uses a cadastre map as a base map for what looks like electricity or freshwater lines. In this case you would like labels for some orientation, but they should never sit on top of the actual data. This is easily done in any CAD, but apparently not so in QGIS.
Jun
16
answered QGIS: Comparing 2 attribute tables to discern unmatched attributes
Apr
30
comment QGIS: field calculator is not working with shapefile created manually
I had a problem yesterday that QGIS 2.2 sometimes wouldn't display any changes in the attribute table until you saved the file and resorted any column. It just kept showing the old values until then. Maybe this is the case for you, too?
Apr
29
comment Removing small spaces (slivers) between polygons?
You could always use the QGIS processing toolbox and apply v.clean.snap directly to your shapefile.
Apr
28
comment More than one WMS layer in QGIS
Combining different WMS in one project shouldn't be a problem, I just tested this in QGIS 2.2.0. But they need to share a common projection (you might have to choose the correct one manually from the list)
Apr
23
comment How does one export the list of stored WMS-servers in QGis?
Don't worry, I also totally missed this just a few weeks ago... :)
Apr
23
revised How does one export the list of stored WMS-servers in QGis?
added image
Apr
23
suggested approved edit on How does one export the list of stored WMS-servers in QGis?
Mar
19
awarded  Necromancer
Mar
19
comment IE8 Openlayers load thousands objects problem
I don't have time for an elaborate answer right now, but you might be interested how I solved a similar problem (visualization of 40k polygons): gis.stackexchange.com/questions/9864/…