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visits member for 1 year, 11 months
seen Nov 28 '13 at 5:22

Jan
3
comment How to consecutively number polygons from north to south following a polyline?
I do mean lines... should have mentioned that, my bad.
Dec
23
comment How to calculate most efficient route passing through all the houses in the world?
Good news! You won't need to get to every house on the planet. Since you only need to visit christian children, there are only ( 15% christian out of 2 billion children, appr. 3,5 children per household) roughly 100 million houses you will have to visit.
Dec
23
comment How can I merge segments to one segment in QGIS (picture inside) and than get the center of each road?
The dropbox-file seems to be empty, so I could not use it. But using the singlepart to multipart tool I was able to merge some lines of my own.
Dec
21
comment How to consecutively number polygons from north to south following a polyline?
I am currently trying to reorder the vertices with mixed results. I have gotten so far that vertices that origin from the same polygon now lie next to each other. But im proving on that approach will have to wait until after the holidays since for the next couple of days I have no access to the data.
Dec
20
comment Error when importing vector layer into GRASS
You can check the validity using Vector -> Geometry Tools -> Check Geometry Validity.
Dec
20
comment How to consecutively number polygons from north to south following a polyline?
@ Jens: I would like to start with the north-western polygon and go reading style to the south-eastern polygon. Using your illustration: A1 C2 B3 F4 E5 D6 I7 H8 G9.
Dec
20
comment How to use geometry functions in rule based styling?
My bad! Didn't know that OSM-data are different from shapes.
Dec
20
comment How to consecutively number polygons from north to south following a polyline?
Unfortunately this does not work. If I calculate the IDs for the points, the spatial distribution is kind of random, which means ID-2 is not next to ID-1 and so forth. The next problem is that I could only use this approach on those polygons that touch the line.
Dec
20
comment Error when importing vector layer into GRASS
Have you checked the layer's geometry validity? I had the same trouble recently and that did the trick for me.
Dec
20
comment How can I merge segments to one segment in QGIS (picture inside) and than get the center of each road?
Is there a way for you to share the file?
Dec
20
comment How can I merge segments to one segment in QGIS (picture inside) and than get the center of each road?
I'm kinda running out of ideas... you could save the shape as a new file and try again, maybe that does the trick. Reinstalling ftools/GDAL tools is also an option.
Dec
20
comment How can I merge segments to one segment in QGIS (picture inside) and than get the center of each road?
What version of ftools/GDAL tolls do you have? (Check the plugin-installer)
Dec
20
comment How to determine the date of the Bing imagery for an area?
I just cross-referenced Bing to my house, since due to ongoing construction work I can determine the date of the image pretty well. The not-microsoft date says 2010, but the image is definitely from (mid) 2012. The Microsoft date is (like Google) always the current year, to indicate that the Terms and Conditions are up to date.
Dec
20
comment Open source tool to view DTED and DEM raster-data
What file extention (format) do those data have? DTED/DEM could be anything from a tiff/png/etc to a database.
Dec
19
comment ECW on Mac Osx 10.8 Mountain Lion
This might help you: surfaces.co.il/?p=793
Dec
14
comment How to read Greek fonts (ISO-8859-7) in shapefile attributes within QGIS 1.8.0?
You have OOO.. great! Set the encoding to UTF-8 when opening and then save. Then you should be able to use greek letters. It worked for me just now.
Dec
14
comment How to read Greek fonts (ISO-8859-7) in shapefile attributes within QGIS 1.8.0?
Try to save the shape file as a new one and set the encoding from the start to UTF...
Dec
14
comment How are you, as GIS professionals, spending most of your day at work?
Replace 'Developing' with 'searching for' and you have my typical day...
Dec
10
comment QGIS field-calculator replace function
I just checked.. CASE WHEN works on 1.8 under Mac.
Dec
10
comment QGIS field-calculator replace function
CASE WHEN expressions seem to be working with 1.8. as well. Either that or I am using a devbuild in disguise...